U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Report 2010–5033

Prepared in cooperation with the West Virginia Department of Transportation, 

Division of Highways

Estimation of Flood-Frequency Discharges for Rural, 

Unregulated Streams in West Virginia

Estimation of Flood-Frequency Discharges 

for Rural, Unregulated Streams in West 

Virginia

By Jeffrey B. Wiley and John T. Atkins, Jr.

Prepared in cooperation with the West Virginia Department of Transportation, 

Division of Highways

Scientific Investigations Report 2010–5033

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2010

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Suggested citation:

Wiley, J.B., and Atkins, J.T., Jr., 2010, Estimation of flood-frequency discharges for rural, unregulated streams in West 

Virginia: U.S. Geological Survey Scientific Investigations Report 2010–5033, 78 p.

ISBN 978-1-4113-2769-6
iii

Contents

Abstract...........................................................................................................................................................1

Introduction.....................................................................................................................................................1

Regional Historical Floods...................................................................................................................1

Description of Study Area ...................................................................................................................4

Previous Studies ...................................................................................................................................4

This Study...............................................................................................................................................6

Development of Flood-Frequency Discharge Equations.........................................................................7

Peak Discharges...................................................................................................................................7

Basin Characteristics...........................................................................................................................7

Correlation of Basin Characteristics .................................................................................................9

West Virginia Skew Coefficients........................................................................................................9

Flood-Frequency Discharges............................................................................................................10

Regional Regression of Flood-Frequency Discharges .................................................................11

Accuracy of Flood-Frequency Discharge Equations....................................................................14

Procedures For Estimating Flood-Frequency Discharges ....................................................................15

At a Streamgage Station ...................................................................................................................15

At an Ungaged Location ....................................................................................................................15

Upstream From a Streamgage Station...................................................................................18

Downstream From a Streamgage Station .............................................................................18

Between Streamgage Stations ...............................................................................................18

Hydrologic Conditions Change Linearly between Streamgage Stations ................19

Hydrologic Conditions Change Linearly to the Regional Hydrologic Conditions 

between Streamgage Stations .........................................................................19

Not on the Same Stream as a Streamgage Station .............................................................20

Example Applications.........................................................................................................................20

Limitations of Procedures for Estimating Flood-Frequency Discharges...................................21

Summary........................................................................................................................................................21

References Cited..........................................................................................................................................22

Appendix 1. Matrices Used to Compute Individual Standard Errors of Prediction ..........................78
iv

Figures

1–4. Map showing—

1. Selected streams used for identifying regional extent of historic floods 

in West Virginia ....................................................................................................................2

2. Appalachian Plateaus, Valley and Ridge, and Blue Ridge Physiographic 

Provinces, and Climatic Divide in West Virginia.............................................................5

3. The 290 U.S. Geological Survey streamgage stations in West Virginia and 

adjacent states considered in the estimation of flood-frequency discharges 

in West Virginia. ...................................................................................................................8

4. The Eastern Panhandle, Central Mountains, and Western Plateaus Regions 

of West Virginia for which equations for estimation of flood frequency 

discharges were developed in this study......................................................................12

5–7. Graph showing—

5. Range of differences of the individual standard errors of the prediction from 

the average prediction errors for the indicated drainage areas...............................14

6. LOESS curves of the absolute difference between the 100-year flood 

discharges determined at streamgage stations and values estimated from 

the (1) drainage-area ratio method and (2) regional equations, in relation to 

the ratios of the drainage areas......................................................................................17

7. LOESS curves of the absolute difference between the 1.1- through 500-year 

flood discharges determined at streamgage stations and values estimated 

from the (1) drainage-area ratio method and (2) regional equations, in relation 

to the ratios of the drainage areas .................................................................................17

Tables

1. Identification numbers, station numbers, streamgage-station names, and skew 

coefficients and statistics for the 290 U.S. Geological Survey streamgage stations 

on rural, unregulated streams in West Virginia and adjacent states ................................25

2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey 

streamgage stations on rural, unregulated streams in West Virginia and adjacent 

states ............................................................................................................................................36

3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage 

stations on rural, unregulated streams in West Virginia and adjacent states.................46

4. Equations used to estimate selected flood-frequency discharges for streams in 

the Eastern Panhandle, Central Mountains, and Western Plateaus Regions 

of West Virginia...........................................................................................................................13

5. Description of the 88 pairs of U.S. Geological Survey streamgage stations in 

West Virginia and adjacent states that were evaluated to quantify “near” for 

application of the drainage-area ratio method in this study ...............................................73

6. Values of the exponent, and upstream and downstream limits of the drainagearea ratios used to quantify the definition of “near” for estimating selected 

flood-frequency discharges for ungaged locations in West Virginia................................16
v

Conversion Factors, Datums, Acronyms, and 

Abbreviations

Multiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Area

square mile (mi2) 2.590 square kilometer (km2) 

Flow rate

cubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)

cubic foot per second per square

mile [(ft3/s)/mi2]

 0.01093 cubic meter per second per square

kilometer [(m3/s)/km2]

Vertical coordinate information is referenced to the North American Vertical Datum of 1988 

(NAVD 88).

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

Altitude, as used in this report, refers to distance above the vertical datum.

Acronyms

GLSNet USGS software for computing generalized least-square regression

LOESS Locally weighted regression

PeakFQ USGS software for computing flood-frequency discharges 

S-PLUS Commercially available software for computing statistics 

USGS U. S. Geological Survey

SWSTAT USGS software for computing surface-water statistics

Abbreviations

AOP Annual-occurrence probability 

AU Drainage area at the location of the unknown flood-frequency discharge

AK Drainage area at the location of the known flood-frequency discharge

AUS Drainage area at the upstream location

ADS Drainage area at the downstream location

AOP Annual-occurrence probability

DRNAREA Drainage area 

EX Exponent for drainage-area ratios
vi

EY Equivalent years of record

K Frequency factor 

MSE Mean-square error 

N Number of years of peak-discharge record 

Q Discharge

QDS Flood-frequency discharge at the downstream location 

QK Known flood-frequency discharge

QKE Regional equation evaluated at the location of the known flood-frequency discharge

Qr Flood-frequency discharge determined from the appropriate regional equation

Qs Flood-frequency discharge determined from systematic and historical record

QU Unknown flood-frequency discharge

QUE Regional equation evaluated at the location of the unknown flood-frequency discharge

QUS Flood-frequency discharge at the upstream location 

Qw Discharge weighted by number of years of peak-discharge record at the gaging station and 

equivalent years of record for the appropriate regional equation

Q(n) Discharge for the n-year recurrence interval

RDS Downstream limit of the ratio of drainage areas 

RU/K Ratio of the drainage area at the location of the unknown flood-frequency discharge to the 

drainage area at the location of the known flood-frequency discharge 

RUS Upstream limit of the ratio of drainage areas

SP Standard deviation of the log10-transformed annual peak discharges

X Log10-transformed annual peak discharges

Xmean Mean of the log10-transformed annual peak discharges
Estimation of Flood-Frequency Discharges for Rural, 

Unregulated Streams in West Virginia

By Jeffrey B. Wiley And John T. Atkins, Jr.

Introduction

Many engineering projects are built within or adjacent to 

flood-prone areas. Information on past flooding and estimates 

of the magnitude and frequency of potential future floods are 

critical to the safe and economical design of hydraulic structures such as bridges, culverts, dams, flood dikes, and levees. 

Regional Historical Floods

Before 1930, neither floods nor streamflow in West 

Virginia were systematically documented. Since 1930, data on 

regional flooding has been collected as part of the operation 

of a statewide streamgaging network supported by State and 

Federal funding. Local floods in small, ungaged watersheds 

remain only sparsely quantified. Major regional floods affecting parts of West Virginia occurred in 1844, 1877, 1878, 1888, 

1889, 1912, 1918, 1932, 1936, 1949, 1963, 1967, 1977, 1984, 

1985, and 1996. For floods prior to 1930, the regional extent 

is not defined, but rivers other than those identified in West 

Virginia may have been affected. Locations of selected West 

Virginia streams are shown in figure 1. A list of flood dates 

with a brief description of the flood and the report that documents the flood follows.

• July 1844: Flooding on the Cheat River was documented by Speer and Gamble (1965, p. 148). This 

flood was about equal in magnitude to those in July 

1888 and May 1996.

• November 1877: Flooding on the South Branch 

Potomac River was documented by Tice (1968, p. 488, 

490). This flood was about equal in magnitude to those 

in March 1936 and September 1996.

• September 1878: Flooding on the New River was 

documented by Speer and Gamble (1965, p. 284–288). 

Abstract

Flood-frequency discharges were determined for 290 

streamgage stations having a minimum of 9 years of record in 

West Virginia and surrounding states through the 2006 or 2007 

water year. No trend was determined in the annual peaks used 

to calculate the flood-frequency discharges.

Multiple and simple least-squares regression equations 

for the 100-year (1-percent annual-occurrence probability) 

flood discharge with independent variables that describe the 

basin characteristics were developed for 290 streamgage 

stations in West Virginia and adjacent states. The regression 

residuals for the models were evaluated and used to define 

three regions of the State, designated as Eastern Panhandle, 

Central Mountains, and Western Plateaus. Exploratory data 

analysis procedures identified 44 streamgage stations that 

were excluded from the development of regression equations 

representative of rural, unregulated streams in West Virginia. 

Regional equations for the 1.1-, 1.5-, 2-, 5-, 10-, 25-, 50-, 

100-, 200-, and 500-year flood discharges were determined 

by generalized least-squares regression using data from the 

remaining 246 streamgage stations. Drainage area was the 

only significant independent variable determined for all equations in all regions.

Procedures developed to estimate flood-frequency discharges on ungaged streams were based on (1) regional equations and (2) drainage-area ratios between gaged and ungaged 

locations on the same stream. The procedures are applicable 

only to rural, unregulated streams within the boundaries of 

West Virginia that have drainage areas within the limits of 

the stations used to develop the regional equations (from 0.21 

to 1,461 square miles in the Eastern Panhandle, from 0.10 to 

1,619 square miles in the Central Mountains, and from 0.13 to 

1,516 square miles in the Western Plateaus). The accuracy of 

the equations is quantified by measuring the average prediction error (from 21.7 to 56.3 percent) and equivalent years of 

record (from 2.0 to 70.9 years).
2 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

OHIO

PENNSYLVANIA

MARYLAND

VIRGINIA

KENTUCKY

River

Potomac River

South Branch

North Branch

River

Oh io River

New

River

Greenbrier Rive r

G u y andotte R iver

Tug

Fo r k Ri v e r

K a n awha R i ver

Elk Ri ver

Little K anaw h a River

Cheat R iver

Tygart Valle y River Monongahela

Gauley R iver

Big Sandy

81°W 78°W

40°N

38°N

0 20 40 60 MILES

0 20 40 60 KILOMETERS

EXPLANATION

State boundary

Major stream

Base from U.S. Geological Survey 1:100,000 digital line graphics. 

Universal Transverse Mercator projection, zone 17, NAD 83.

Figure 1. Selected streams used for identifying regional extent of historic floods in West Virginia.
Introduction 3

• July 1888: Flooding on the Monongahela River was 

documented by Speer and Gamble (1965, p. 121, 138, 

146–149). This flood was about equal in magnitude to 

those in July 1844 on the Cheat River and May 1996 

on the Cheat and upper Monongahela Rivers.

• May–June 1889: Flooding on the North Branch 

Potomac River was documented by Tice (1968, p. 480, 

490, 494, 497). This flood was about equal in magnitude to those in March 1936 and September 1996.

• July 1912: Flooding on the Tygart Valley River was 

documented by Speer and Gamble (1965, p. 118, 121, 

127–128).

• March 1918: Flooding on the Greenbrier and Gauley 

Rivers was documented by Speer and Gamble (1965, 

p. 298, 310). 

• February 1932: Flooding on the Tygart Valley, Greenbrier, and Gauley Rivers was documented by Speer and 

Gamble (1965, p. 119, 121, 129, 295, 298, 304, 307, 

310).

• March 1936: Flooding was documented on the 

Potomac and Cheat Rivers. This flood, which was 

documented by Grover (1937) as having a regional 

extent including the upper Ohio, Potomac, and James 

Rivers (the James River in Virginia), was caused 

by four separate cyclonic storms passing over the 

northeastern United States, resulting in multiple peak 

discharges and superposition of later peak discharges 

on earlier peak discharges. This flood was about equal 

in magnitude to those in November 1877 on the South 

Branch Potomac River, May through June 1889 on the 

North Branch Potomac River, and September 1996 

on the upper Potomac River (both North and South 

Branch).

• June 1949: Flooding on the South Branch Potomac 

River was documented by Tice (1968, p. 483–488).

• March 1963: Flooding was documented on the Big 

Sandy (including the Tug Fork in West Virginia), Guyandotte, Little Kanawha, Cheat, and Greenbrier Rivers. 

This flood, which was documented by Barnes (1964) 

as having affected the western slopes of the Appalachian Mountains from Alabama to West Virginia, was 

caused by three separate frontal storms in which rain 

fell on a snowpack and was followed by two additional 

storms.

• March 1967: Flooding was documented on the 

Kanawha and Monongahela Rivers. This flood was 

caused by 4 to 5 in. of rainfall over 3 days, augmented 

by runoff from melting snow (U.S. Geological Survey, 

1991). 

• April 1977: Flooding was documented on the Tug Fork 

and Guyandotte Rivers. This flood was documented by 

Runner (1979) and Runner and Chin (1980) as having 

affected northeastern Tennessee, southwestern Virginia, eastern Kentucky, and southern West Virginia. 

This flood resulted from a frontal storm that moved 

southeastward through the region, became stationary, 

then moved slowly northwestward drawing a warm 

moist maritime airmass from the Gulf of Mexico and 

combining to produce heavy rainfall. The highest peak 

discharges ever recorded on the Tug Fork and Guyandotte Rivers resulted from this storm.

• May 1984: Flooding was documented on the Tug 

Fork and Guyandotte Rivers (U.S. Geological Survey, 

1991).

• November 1985: Flooding was documented on the 

Monongahela, Potomac, upper Little Kanawha, upper 

Elk, and upper Greenbrier Rivers. This flood was 

documented by Lescinsky (1987) and Carpenter (1990) 

as having affected eastern West Virginia, western and 

northern Virginia, southwestern Pennsylvania, and 

western Maryland. This flood resulted from a complex 

sequence of meteorological events. Hurricane Juan 

moved from the Gulf of Mexico through southern 

Mississippi, ultimately causing precipitation as far 

north as Michigan and generating less than 2 in. of 

rainfall in West Virginia. This rainfall was caused by 

a second low pressure system that developed from 

the hurricane remnants. The low pressure developed 

near the Tennessee-North Carolina border and traveled rapidly eastward to the Atlantic Ocean. A third 

low pressure system moved from the Gulf of Mexico 

into the Florida panhandle then moved slowly up the 

east coast of the United States, resulting in additional 

rainfall in West Virginia of up to 9 in. The highest peak 

discharges ever recorded on the upper Monongahela 

and Potomac Rivers resulted from this flood.

• January 1996: About 2 in. of rain fell on a 3 to 4 ft 

snowpack, resulting in flooding in the upper Potomac, 

upper Cheat, upper Elk, and Greenbrier Rivers.

• May 1996: A frontal storm caused flooding on the 

Cheat and upper Monongahela Rivers that was about 

equal in magnitude to flooding on the Cheat River in 

July 1844 and July 1888. 

• September 1996: Tropical storm Fran caused regional 

flooding on the upper Potomac River. This flood was 

about equal in magnitude to that in November 1877 

on the South Branch Potomac River, to that in May 

through June 1889 on the North Branch Potomac 

River, and to that in March 1936 on the upper Potomac 

River.
4 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

Description of Study Area

West Virginia can be differentiated into three physiographic provinces, the Appalachian Plateaus, Valley and 

Ridge, and Blue Ridge (Fenneman, 1938) (fig. 2). The movement of air masses across the State allows identification of two 

climatic regions, separated by a line defined as the Climatic 

Divide (Wiley, 2008) (fig. 1).

Generally, the part of the State west of the Climatic 

Divide is in the Appalachian Plateaus Physiographic Province, 

where altitudes range from about 2,500 to 4,861 ft (NAVD88) 

at Spruce Knob along the Climatic Divide to about 550 to 

650 ft along the Ohio River. The part of West Virginia east of 

the Climatic Divide is in the Valley and Ridge Physiographic 

Province, except for the extreme eastern tip of the State, 

which is in the Blue Ridge Physiographic Province. Altitudes 

decrease eastward from the Climatic Divide to 274 ft at Harpers Ferry in the Eastern Panhandle (U.S. Geological Survey, 

1990, 2006; National Oceanic and Atmospheric Administration, 2006a).

The Appalachian Plateaus Physiographic Province consists of consolidated, mostly noncarbonate sedimentary rocks 

that have a gentle slope from southeast to northwest near the 

Climatic Divide and are nearly flat-lying along the Ohio River. 

One exception is in the northeastern area of the province (west 

of the Climatic Divide), where the rocks are gently folded and 

some carbonate rock crops out (Fenneman, 1938). The rocks 

in the Appalachian Plateaus Physiographic Province have been 

eroded to form steep hills and deeply incised valleys; drainage 

patterns are dendritic.

The Valley and Ridge Physiographic Province in West 

Virginia consists of consolidated carbonate and noncarbonate sedimentary rocks that are folded sharply and extensively 

faulted (Fenneman, 1938). Northeast-trending valleys and 

ridges parallel the Climatic Divide; drainage patterns are 

trellis.

The Blue Ridge Physiographic Province within West Virginia consists predominantly of metamorphosed sandstone and 

shale (Fenneman, 1938). The province has high relief between 

mountains and wide valleys that parallel the Climatic Divide.

The climate of West Virginia is primarily continental, 

with mild summers and cold winters. Major weather systems 

generally approach from the west and southwest, although 

polar continental air masses of cold, dry air that approach from 

the north and northwest are not unusual. Air masses from the 

Atlantic Ocean sometimes affect the area east of the Climatic 

Divide and less frequently affect the area west of the Climatic 

Divide. Generally, tropical continental masses of hot, dry air 

from the southwest affect the climate west of the Climatic 

Divide. Tropical maritime masses of warm, moist air from the 

Gulf of Mexico affect the climate east of the Climatic Divide 

more than west of the Climatic Divide. Evaporation from local 

and upwind land surfaces, lakes, and reservoirs also provides 

a source of moisture that affects the climate of the State (U.S. 

Geological Survey, 1991; National Oceanic and Atmospheric 

Administration, 2006a).

Annual precipitation averages about 42 to 45 in. statewide with about 60 percent received from March through 

August. July is the wettest month, and September through 

November are the driest. Annual average precipitation in 

the State generally decreases northwestward from about 50 

to 60 in. along the Climatic Divide to about 40 in. along the 

Ohio River, and increases from about 30 to 35 in. east of the 

Climatic Divide to about 40 in. in the extreme eastern tip of 

the State. Greater precipitation along and west of the Climatic Divide is a consequence of the higher elevations along 

the Divide and the general movement of weather systems 

approaching from the west and southwest. Annual average 

snowfall follows the general pattern of annual average precipitation, decreasing northwestward from about 36 to 100 in. 

along the Climatic Divide to about 20 to 30 in. along the Ohio 

River. Annual average snowfall ranges from 24 to 36 in. east 

of the Climatic Divide (U.S. Geological Survey, 1991; Natural 

Resources Conservation Service, 2006; National Oceanic and 

Atmospheric Administration, 2006a, 2006b).

Flooding across large drainage areas results from regional 

climatic events like frontal systems in winter and early spring, 

rainfall on snowpack in early spring, and tropical cyclones 

(hurricanes and tropical storms) in late summer or early fall. 

Generally, the most severe flooding across small drainage 

areas results from local intense thunderstorms in late spring 

through summer (Doll and others, 1963).

Previous Studies

Flood-frequency studies completed by Wiley and others (2000, 2002) used data for peak discharges from 267 

rural, unregulated streamgage stations in West Virginia and 

adjacent states. Simple and multiple least-squares regression 

models were used to determine three regions in the State and 

to develop initial estimating equations with drainage area as 

the only significant independent variable. The final estimating equations were determined for the 1.1-, 1.2-, 1.3-, 1.4-, 

1.5-, 1.6-, 1.7-, 1.8-, 1.9-, 2-, 2.5-, 3-, 5-, 10-, 25-, 50-, 100-, 

200-, and 500-year flood discharges using a generalized leastsquares regression model (Stedinger and Tasker, 1985; Tasker 

and Stedinger, 1989).

New procedures for transferring the flood-frequency 

discharges determined by Wiley and others (2000, 2002) 

to ungaged locations were presented by Wiley (2008, 

Appendix 1). These methods incorporated a comparison of 

discharge estimates determined using drainage-area ratios to 

discharge estimates determined by application of the flood-frequency equations. This current study repeats that analysis and 

supersedes the results presented in Wiley (2008, Appendix 1).

Atkins and others (2009) determined generalized skew 

coefficients applicable to West Virginia (WV skew) for use 

in determining flood-frequency discharges at streamgage stations. The WV skew coefficients supersede the United States 

skew coefficients (U.S. skew) determined by the Interagency 

Advisory Committee on Water Data (1982). Analysis of 
Introduction 5

VALLEY AND RIDGE

A P P A L A C H I A N P L A T E A U S

BLUE

RIDGE

Elkins

Beckley

Spruce

Knob

Wheeling

Morgantown

Huntington

Charleston

Harpers 

Ferry

OHIO

PENNSYLVANIA

MARYLAND

VIRGINIA

KENTUCKY

81°W 78°W

40°N

38°N

0 20 40 60 MILES

0 20 40 60 KILOMETERS

EXPLANATION

State boundary

Geographic location

C l i m a t i c D i v i d e

Base from U.S. Geological Survey 1:100,000 digital line graphics. 

Universal Transverse Mercator projection, zone 17, NAD 83.

Physiographic provinces from Fenneman, 1938

Figure 2. Appalachian Plateaus, Valley and Ridge, and Blue Ridge Physiographic Provinces, and Climatic Divide in West Virginia.
6 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

discharges at 147 rural, unregulated streams in West Virginia 

and adjacent states with streamgage stations followed guidelines established by the Interagency Advisory Committee on 

Water Data (1982), except that streamgage stations having 50 

or more years of record were used instead of those with the 

recommended 25 years of record. The increased record length 

of 50 years was determined to be statistically significant when 

compared to the recommended 25 years. The generalizedskew analysis considered contouring, averaging, and regression of station skews; the best method was determined to be 

that with the smallest mean-square error (MSE). The contouring of station skews was found to be the best method for 

determining generalized skew for West Virginia, with a MSE 

of 0.2174 (Atkins and others, 2009). The MSE of 0.2174 is a 

significant improvement (28 percent reduction) over the MSE 

of 0.3025 for the U.S. skew, presented by the Interagency 

Advisory Committee on Water Data (1982).

Flood-frequency studies completed by Frye and Runner (1969, 1970, 1971) and Runner (1980a and b) for West 

Virginia lacked data on peak discharges at streamgage stations 

having drainage areas less than 50 mi2. These studies found 

that the lack of data for small drainage areas could be overcome by (1) not using the flood-frequency estimating methods 

for small drainage areas, (2) limiting the flood-frequency 

discharge estimates to small recurrence intervals, (3) increasing the record lengths for small drainages by using a rainfallrunoff model, or (4) using a composite analysis of long-term 

data (primarily stations with a minimum of 40 years of record) 

with an analysis of long-term data combined with short-term 

data for small drainage areas.

Frye and Runner (1969) estimated flood-frequency 

discharges for rural, unregulated streams in West Virginia 

by using equations presented in U.S. Geological Survey 

Water Supply Papers 1672 (Tice, 1968) and 1675 (Speer and 

Gamble, 1965). The nationwide flood-frequency discharge 

equations in these publications were developed for regional or 

major river basins. The authors suggested that the equations 

only be used for drainage areas greater than 50 mi2 in the Ohio 

River Basin and greater than 30 mi2 in the Potomac River 

Basin.

Frye and Runner (1970) presented a method for estimating flood-frequency discharges using an analytical technique 

similar to that proposed by Benson (1962). Peak-discharge 

data from streamgage stations on rural, unregulated streams 

in West Virginia with a minimum of 10 years of record were 

analyzed. The authors suggested that the analytical techniques 

be used only for drainage areas greater than 50 mi2 because 

adequate data were not available.

Frye and Runner (1971) presented a method for estimating the 2-, 5-, and 10-year flood discharges for rural, 

unregulated streams in the Ohio River Basin of West Virginia. 

Data from a network of small streams with an average record 

length of 6 years were correlated with long-term data from 

streamgage stations to estimate additional years of peak discharges. The equations were applicable only to streams with 

drainage areas between 1 and 50 mi2. 

Runner (1980a) presented equations for estimating the 2-, 

5-, 10-, 25-, 50-, 100-, and 500-year flood discharges for rural, 

unregulated streams in West Virginia. The estimating equations were used only for drainage areas of 0.3 to 2,000 mi2

. 

The flood-frequency discharges in this study were made using 

methods recommended by the Interagency Advisory Committee on Water Data (1976), including adjustments to stationfrequency determinations by applying weighted regional and 

station skews. The peak-discharge data from 170 streamgage 

stations included data from Maryland and Virginia. Records 

of peak discharges for 15 stations with small drainage areas 

(ranging from 1.8 to 12.2 mi2) were synthesized to greater than 

40 years of record (Runner, 1980b) by use of a rainfall-runoff 

model developed by Dawdy and others (1972). On the basis of 

regression analyses using 12 basin characteristics as independent variables, regional flood-frequency discharge equations 

were developed separately for stations with more than 40 

years of record (including 15 small drainage-area streamgage 

stations for which at least 40-year records were estimated) 

and for all 170 stations. Three regions were delineated using 

an analysis of the regression residuals, and drainage area was 

determined to be the only statistically significant independent 

variable. A composite of the equations for stations with greater 

than 40 years of record and all 170 streamgage stations was 

determined.

This Study

To provide flood-related information and estimates 

needed for the design of structures that will meet existing 

or proposed safety standards, yet not incur excessive costs 

because of overdesign, the U.S. Geological Survey (USGS), in 

cooperation with the West Virginia Department of Transportation, Division of Highways, revised previously developed 

equations for estimating the magnitude and frequency of flood 

discharges on rural, unregulated streams in West Virginia. The 

results of this study supersede those published by Wiley and 

others (2000, 2002).

This report presents newly revised equations for estimating the discharges of the 1.1-, 1.5-, 2-, 5-, 10-, 25-, 50-, 100-, 

200-, and 500-year recurrence interval floods (flood-frequency 

discharges) on rural, unregulated streams in West Virginia. 

A flood frequency is the reciprocal of the annual-occurrence 

probability (AOP), in percent, where the 100-year flood frequency is equal to the 1-percent AOP. This report documents 

the information used to estimate flood-frequency discharges 

and includes a list of regional floods in West Virginia; a 

discussion of climatic conditions affecting flooding; a presentation of results from previous studies; and an inventory of 

data sources containing peak discharges, basin characteristics, 

and skew coefficients. The statistical methods are described, 

including an accounting of error, which provides project 

designers with the associated uncertainty of flood discharge 

estimates determined from applying flood-frequency discharge 

equations to West Virginia streams. 
Development of Flood-Frequency Discharge Equations 7

Development of Flood-Frequency 

Discharge Equations 

Annual peak discharge data, basin characteristics data, 

and generalized West Virginia skew coefficients for 290 

streamgages on rural, unregulated streams in West Virginia 

and adjacent states were analyzed to determine regional equations to be used to estimate the magnitude of flood discharges 

for selected recurrence intervals. Basin characteristics, generalized West Virginia skew coefficients, and flood-frequency 

discharges for streamgage stations in adjacent states developed 

for this study do not supersede values used by adjacent states. 

The equations for the 100-year recurrence interval (1-percent 

AOP) flood discharges were regionalized by plotting the areal 

distribution of residuals determined by use of multiple and 

simple least-squares regression models. Independent variables 

describe basin characteristics (such as drainage area, mean 

annual precipitation, and percent forest cover) for each station 

location. Areal distributions of residual plots from regressions of the 100-year discharges were used to select stations 

in adjacent states to represent flood discharges expected in 

West Virginia and to determine regional boundaries. The 

initial regional equations for the selected recurrence intervals 

were derived with the use of multiple and simple least-square 

regression models and by determining the significance of independent variables. The final regional equations were derived 

with the use of a generalized least-square regression model 

and independent variables from the initial regional equations.

Peak Discharges

Annual peak discharges at 290 streamgage stations on 

rural, unregulated streams with a minimum of 9 years of 

record through the 2007 water year (the period beginning 

October 1 of the previous year through September 30 of the 

indicated year) in West Virginia and through the 2006 (2007 

for some stations in Maryland) water year for stations in 

adjacent states were available for this study (fig. 3; table 1, 

at end of this report). Guidelines established by the Interagency Advisory Committee on Water Data (1982) required 

that streamgage used in the analysis have a minimum of 

10 years of record, but stations with 9 years of record were 

accepted because the addition of six stations with drainage 

areas less than 30 mi2 was considered more beneficial to this 

study than adhering to the 10-year guideline. Annual-peakdischarge data are maintained in the U.S. Geological Survey’s “Peak File” database available on the World Wide Web 

from the USGS United States NWIS-W Data Retrieval site 

(http://waterdata.usgs.gov/). 

Peak discharges at the streamgage station Cheat River 

at Rowlesburg, identification number (ID) 121 in fig. 3 and 

streamgage station number (streamgage) 03070000 in table 1, 

are from a combination of records that include and exclude 

flow from the tributary stream Saltlick Creek. Peak-discharge 

data collected at Rowlesburg prior to the flood of November 

5, 1985, include flow from Saltlick Creek for a drainage area 

of 974 mi2. Peak-discharge data collected at Rowlesburg from 

November 6, 1985, through September 30, 1996, exclude 

flow from Saltlick Creek for a drainage area of 939 mi2. 

Streamgage station ratings (relations between stream stage and 

discharge) were difficult to define accurately after November 5, 1985, because they were affected by scour throughout 

the range of stage. Peak discharges were not adjusted for the 

4-percent difference in drainage area (typically necessary 

when records are combined) because the rating definition difficulties resulted in peak discharges with much greater than 4 

percent uncertainties.

Peak discharges at the streamgage station Right Fork 

Holly River at Guardian (ID 229 and streamgage 03195100) 

for the 1979 to 1982 water years, and peak discharges at 

the station Left Fork Holly River near Replete (ID 230 and 

streamgage 03195250) for the 1979 to 1982 and 1987 to 2007 

water years were provided by the U.S. Army Corps of Engineers, Huntington District (Phillip E. Anderson, oral and written commun., 1997 and 1998; Charlotte L. Hazelett, written 

commun., 2007).

Peak discharges at the streamgage station Fernow Watershed Number Four near Hendricks (ID 113 and streamgage 

03067100) for the 1952 to 2006 water years were provided by 

the U.S. Forest Service, Fernow Experimental Forest (Frederica Wood, written commun., 2006 and 2007). No data were 

available for the 2007 water year at the time of this study.

Peak discharge records for the streamgage station 

Elk River below Webster Springs (ID 227 and streamgage 

03194700) were lengthened using records for the station Elk 

River at Centralia (ID 228 and streamgage 03195000). Peak 

discharges at the station Twelvepole Creek below Wayne 

(ID 266 and streamgage 03207020) were lengthened using 

records for the station Twelvepole Creek at Wayne (ID 265 

and streamgage 03207000). Peak discharges at the station 

Tug Fork at Kermit (ID 285 and streamgage 03214500) were 

lengthened using records for Tug Fork near Kermit (ID 284 

and streamgage 03214000). Peak discharges at the station 

New River at Fayette (ID 207 and streamgage 03186000) were 

lengthened using records for New River at Caperton (ID 206 

and streamgage 03185500); and peak discharges at the station 

Cheat River near Pisgah (ID 123 and streamgage 03071000) 

were lengthened using records for Cheat River near Morgantown (ID 124 and streamgage 03071500). Records were 

lengthened by estimating discharges using drainage-area 

ratios; the stations used to lengthen records were not considered in the regression analysis.

Basin Characteristics

Characteristics of the basins draining to the 290 

streamgage stations on rural, unregulated streams in West 

Virginia and adjacent states (Paybins, 2008) were available 

for use as independent variables in the regression analysis. 
8 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

OHIO

PENNSYLVANIA

MARYLAND

VIRGINIA

KENTUCKY

81°W 78°W

40°N

38°N

0 20 40 60 MILES

0 20 40 60 KILOMETERS

EXPLANATION

State boundary

County boundary

Major stream

212 Streamgage station and identification number

Base from U.S. Geological Survey 1:100,000 digital line graphics for state boundaries and streams and 

from the West Virginia Department of Environmental Protection 1:24,000 digital data for county boundaries. 

Universal Transverse Mercator projection, zone 17, NAD 83.

9

6 8

5

3

2 1

99

98

97

96 95

94

93

92

91

90

89

87

86 85

84

83

82

81

80

79

78

77

76

75

74

73

72 71

70 69

68

67

66

65

64 63

62

61 60

59

58

57

56

55 54

53 52

51

50 49 48

47

46

45

44

43

42

41

39, 40

38

37

35,36

33 34

32

31

30

29

28

27

26

23

22

21

19, 20

18

17 16

15

14

13

12

11

10

290

289

288

287

286

285

284

283

282

281

280

279

278

277

275

274

273

272

271

270

269268

267

266

265

264

263

262

261

260

259

258

257 256

255

254 253

252 251

250

249

248

247 246 245

244

243

242

241 240

239

238

237

236

235

234

233

232

231 230

229 228

226

225

224

223

222 221 220

219

218 217 216

214

213

212

211 210

209 208

207

206

205

204

203 202

201 200

199 198

197

196

195194 193

192

191 190

189

188

186

185

184

183

182

181

180

179

178

177

176

175

174

173

172

171

170

169 168 167

166

165

164

163

162

160

159

158

157 156

155

154

153

149, 150, 151, 152

148

147 146

145 144

143

142

141

139, 140 138

137

136

135

134

133

132

131

130

129

128

127

125 126

124

123

122

121

120

119

118

116

115

114

113

112 111

109

108

106

105

104

103 102

101

4, 7

88

24, 25

276

227

215

187

161

117 110

107

100

Figure 3. The 290 U.S. Geological Survey streamgage stations in West Virginia and adjacent states considered in the estimation of 

flood-frequency discharges in West Virginia. (Identification numbers are cross-references with streamgage-station names and numbers 

in table 1.)
Development of Flood-Frequency Discharge Equations 9

The 36 basin characteristics evaluated for use in this study are 

the following: drainage area (DRNAREA), in mi2 (Mathes, 

1977; Wilson, 1979; Mathes and others, 1982; Preston and 

Mathes, 1984; Stewart and Mathes, 1995; Wiley, 1997; Wiley 

and others, 2007); latitude of the basin centroid, in decimal 

degrees; longitude of the basin centroid, in decimal degrees; 

basin perimeter, in mi; basin slope, in ft/mi; basin relief, in 

ft; basin orientation, in degrees; channel length, in mi; valley 

length, in mi; channel slope, in ft/mi; stream length, in mi; 

mean basin elevation, in ft; 24-hour 2-year rainfall, in inches; 

annual precipitation, in inches; January minimum temperature, 

in degrees Fahrenheit; annual snow depth, in inches; forest 

cover, in percent; grassland cover, in percent; barren land 

cover, in percent; urban land cover, in percent; wetland cover, 

in percent; open-water cover, in percent; agriculture cover, 

in percent; impervious cover, in percent; basin width, in mi; 

shape factor, dimensionless; elongation ratio, dimensionless; 

rotundity of basin, dimensionless; compactness ratio, dimensionless; relative relief, in ft/mi; sinuosity ratio, dimensionless; 

stream density, in mi/mi2; channel maintenance, in mi2/mi; 

slope proportion, dimensionless; ruggedness number, in ft/mi; 

and slope ratio, dimensionless. 

Correlation of Basin Characteristics

The basin characteristics were log10 transformed and 

evaluated for linear correlation by using a Pearson coefficient, 

or Pearson’s r (Helsel and Hirsch, 2002). The numeral one was 

added to values of grassland cover, barren land cover, urban 

land cover, wetland cover, open-water cover, agriculture cover, 

and impervious cover to ensure that values were greater than 

zero for log10 transformation. To decrease values for regression analysis, 77 was subtracted from longitude of the basin 

centroid, and 37 was subtracted from latitude of the basin 

centroid.

Basin characteristics were considered highly correlated 

where the absolute value of the Pearson coefficient was 

greater than or equal to 0.80. The following characteristics 

were highly correlated within each group: drainage area, basin 

perimeter, channel length, valley length, basin width, stream 

length, compactness ratio, and slope proportion; channel slope, 

relative relief, and slope ratio; shape factor, elongation ratio, 

and rotundity of basin; basin relief and ruggedness number; 

valley length and basin relief; and urban land cover and impervious cover. 

The Pearson coefficient was equal to the numeral one 

(singularity) for some combinations of basin characteristics 

including stream density and channel maintenance; shape 

factor, elongation ratio, and rotundity of basin; drainage area, 

basin width, shape factor, and rotundity of basin; and stream 

length, compactness ratio, relative relief, stream density, and 

ruggedness number. The characteristics elongation ratio, 

rotundity of basin, channel maintenance, and basin width 

were removed from consideration for regression because of 

singularity. 

The number of basin characteristics considered for 

regression was reduced from 36 to 32 with the removal of the 

characteristics because of singularity. Additional characteristics having singularity were removed if they became significant in the regression analysis.

West Virginia Skew Coefficients

Atkins and others (2009) determined generalized skew 

coefficients applicable to West Virginia, the WV skew, to 

supersede the U.S. skew presented by the Interagency Advisory Committee on Water Data (1982) (table 1, at the end of 

this report). The generalized skew coefficient is a regional 

measure (of individual streamgage-station skews) of the fitness of annual-peak discharges to a Pearson Type III probability curve. The WV skew coefficients used in this current 

study do not supersede values used for studies in adjacent 

states but are applicable only to analyses in West Virginia. The 

difference between the WV- and U.S.-skew coefficients (WV 

skew minus U.S. skew) ranged from -0.493, unitless, for Brier 

Creek at Fanrock (ID 255 and streamgage 03202480) to 0.491, 

unitless, for Dry Fork at Hendricks (ID 110 and streamgage 

03065000). 

A direct relation was not observed between the difference between the WV- and U.S.-skew coefficients and the 

difference between the flood-frequency discharge calculations 

made using the WV- and U.S.-skew coefficients. (Skew coefficients are weighted and adjusted using systematic years of 

record, systematic skews, low- and high-outlier criterion, and 

historic years to determine flood frequencies.) The 100-year 

flood discharges determined in this study using the WV skew 

were compared to the 100-year flood discharges calculated 

using the U.S. skew. The differences in the 100-year flood 

discharges (discharge using WV skew minus discharge using 

U.S. skew, divided by discharge using WV skew, times 100) 

ranged from -23.8 percent for Marsh Fork at Maben (ID 253 

and streamgage 03202245) to 13.3 percent for Job Run near 

Wymer (ID 109 and streamgage 03063950). An area of large 

negative differences was observed for the headwaters of the 

Coal, Guyandotte, and Tug Fork Rivers near the southern 

border of the State, and an area of large positive differences 

was observed for the headwaters of the South Branch Potomac 

River near the eastern border of the State. The difference for 

Brier Creek at Fanrock (ID 255 and streamgage 03202480) is 

-14.3 percent (-0.493, unitless, difference in skews discussed 

above), and the difference for Dry Fork at Hendricks (ID 110 

and streamgage 03065000) is 3.8 percent (the 0.491, unitless, 

difference in skews discussed above); these streamgage stations are located near the southern and north-central areas of 

the State, respectively. 
10 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

Flood-Frequency Discharges

The flood-frequency discharges at the 290 streamgage 

stations on rural, unregulated streams were determined following the guidelines established by the Interagency Advisory 

Committee on Water Data (1982). The U.S. Geological Survey 

computer program PeakFQ (Flynn and others, 2006) was used 

to compute the flood-frequency discharges. In the analysis of 

flood-frequency discharges for adjacent states, information 

from previous studies was used (Bisese, 1995; Dillow, 1996; 

Stuckey and Reed, 2000; Hodgkins and Martin, 2003; and 

Koltun, 2003) as a reference for determining flood-frequency 

discharges calculated with the WV skew for use in this current 

study.

The log10-transformed systematic (continuous record or 

broken record that can be statistically treated as a continuous record) annual-peak series for each streamgage station 

was fitted to the Pearson Type III probability curve. Regional 

general skew (WV skew) was obtained from the map developed by Atkins and others (2009). Regional general skew is 

weighted with station skew to determine a final adjustment to 

the Pearson Type III probability curve. Additionally, highoutlier, low-outlier, and historical peak assessments were 

made to adjust the annual-peak series. Mixed populations, 

such as floods from snowmelt and those from tropical storms 

or hurricanes, were not analyzed separately. Selected statistics from the flood-frequency discharge analyses for the 290 

streamgage stations in West Virginia and adjacent states are 

listed in table 2 (at the end of this report). Flood-frequency 

discharges determined following the guidelines established by 

the Interagency Advisory Committee on Water Data (1982) for 

10 recurrence intervals for the 290 streamgage stations in West 

Virginia and adjacent states are identified as Qs in table 3 (also 

at the end of this report); the 10 recurrence intervals are the 

1.1- (90-percent AOP), 1.5- (67-percent AOP), 2- (50-percent 

AOP), 5- (20-percent AOP), 10- (10-percent AOP), 25- (4-percent AOP), 50- (2-percent AOP), 100- (1-percent AOP), 200- 

(0.5-percent AOP), and 500-year (0.2-percent AOP). 

The PeakFQ computer program does not output flood-frequency discharges for all the recurrence intervals needed for 

this study. However, subroutines within PeakFQ (the HARTIV 

subroutine with related subroutines and functions, originally 

developed by Kirby, 1980) were used to calculate the needed 

flood-frequency discharges. The 1.1-year and sometimes the 

1.5-year flood discharges were computed for 15 streamgage 

stations using the PeakFQ subroutines; these discharges are 

footnoted in table 3 (at the end of this report). The identified 

subroutines within PeakFQ do not calculate discharge directly, 

but determine a frequency factor (K or “the K value”) that is 

used to calculate the discharge. A short Fortran computer program (Wiley and others, 2002, Appendix 1) was used to calculate all the frequency factors using the Bulletin-17B weighting procedures and the WV skew (Atkins and others, 2009) 

(table 1, at the end of this report). The short computer program 

uses the current versions of computer subroutines contained in 

a library of USGS water-resources application programs (U.S. 

Geological Survey, 2001). The frequency factors are used to 

determine discharge by computing the antilog of discharge 

from the following modified equation (Interagency Advisory 

Committee on Water Data, 1982, equation 1, p. 9):

Log10 Q = Xmean + KSP , (1)

where 

Xmean = ∑ X / N, (2)

where

	 X is the log10-transformed annual peak 

discharges (Bulletin-17B adjusted), in ft3/s; 

and

N is the number of years of peak-discharge 

record, unitless;

K is the frequency factor, unitless; and

SP is the standard deviation of the log10-

transformed annual peak discharges 

(Bulletin-17B adjusted), in ft3/s: 

[∑ (X – Xmean)2 / (N – 1)]0.5. (3)

Typically, the magnitude of a flood-frequency discharge 

increases with increasing drainage area. For floods with recurrence intervals greater than 10 years, however, the flood-frequency discharges calculated for the streamgage station Tygart 

Valley River near Dailey (ID 83 and streamgage 03050000) 

are greater than those for the station Tygart Valley River 

near Elkins (ID 84 and streamgage 03050500), although the 

drainage area for Tygart Valley River near Dailey (185 mi2) 

is smaller than the drainage area for Tygart Valley River near 

Elkins (271 mi2) (tables 2 and 3, at the end of this report). This 

inconsistency may be due to the wide floodplain along the 

river between Daily and Elkins, which contrasts with the more 

mountainous and narrower floodplains upstream from Daily 

and, therefore, increases the stream storage and attenuates 

the flood peak. The inconsistency also may occur because the 

frequency analysis for each station is based on different time 

periods, thus creating a time-sampling error.

Wiley and others (2000) investigated data for the 

streamgage station Poplar Fork at Teays (ID 248 and 

streamgage 03201410) for nonhomogeneity. The study 

concluded that the data for the period 1967 to 1978 indicate 

annual peaks were higher than those for 1992 to 1997, but 

collection of additional years of record would be necessary to 

resolve the question of nonhomogeneity. This current study 

determined that nonhomogeneity exists between the periods 

1967 to 1978 and 1992 to 2007. It is hypothesized that excessive runoff from nearby impervious areas resulted in higher 

annual peaks for the period 1967 to 1978. The excessive runoff no longer affects annual peaks since the streamgage station 

was moved to a location upstream from the nearby impervious 

areas for the period 1992 to 2007. The flood-frequency discharges for Popular Fork at Teays were determined using only 
Development of Flood-Frequency Discharge Equations 11

annual peaks for the period 1992 to 2007 because they better 

represent a rural, unregulated stream.

The randomness of the systematic annual-peak series 

was statistically tested to detect a trend using Kendall’s test 

for correlation (Kendall, 1975; Hirsch and others, 1982). The 

computer program SWSTAT (Surface Water STATistics), version 4.1, dated February 25, 2002, (Lumb and others, 1990; 

A.M. Lumb, W.O. Thomas, Jr., and K.M. Flynn, USGS, written commun., titled “Users manual for SWSTAT, a computer 

program for interactive computation of surface-water statistics,” June 15, 1995) was used to calculate Kendall’s tau and 

the level of significance (the probability or p-value). For the 

Kendall’s test for correlation, the hypothesis that there is no 

trend is tested. If the hypothesis fails to attain a particular level 

of significance, the hypothesis of no trend is rejected. For this 

study, the particular level of significance selected was 0.05, 

so a trend is determined for an annual-peak series if the level 

of significance is less than 0.05. Kendall’s tau and the level 

of significance were determined for the annual-peak series of 

246 streamgage stations (44 stations were eliminated from 

consideration as part of the regression analysis discussed later 

in this report) in West Virginia (table 2). Streamgage stations 

were further limited to the 125, those with a minimum of 

30 years of record, to eliminate affects that might be due to 

natural climatic variations (U.S. Geological Survey, 2005). 

The annual-peak series for 12 streamgage stations (about 10 

percent of the 125 stations) indicated a trend, 7 positive and 

5 negative. If chance were the only factor, 6 streamgage stations would be expected to indicate a trend (about 5 percent 

of the 125 stations). Statistics indicate trends at twice as many 

streamgage stations as would be expected by chance, but the 

trends were nearly equally divided between stations with positive and negative values. Therefore, no significance could be 

determined for the trends indicated at the 12 stations.

Regional Regression of Flood-Frequency 

Discharges

Regression models with the 10 log10-transformed floodfrequency discharges as dependent variables and the 36 

log10-transformed basin characteristics as potential independent variables were evaluated. The flood-frequency equations 

for the 100-year recurrence interval (1-percent AOP) were 

regionalized by plotting the areal distribution of residuals from 

the application of multiple and simple least-squares regression models. Regional regression procedures were performed 

using the computer program S-PLUS 7.0 (Insightful Corporation, 2005), a commercially available statistical computing 

package. Areal distributions of residual plots indicated three 

regions—Eastern Panhandle, Central Mountains, and Western Plateaus—with drainage area (DRNAREA) as the only 

significant independent variable (fig. 4). Initial equations for 

all flood-frequency discharges were determined using the 

regions determined by analysis of the 100-year flood, and the 

outcomes of all equations identified DRNAREA as the only 

significant independent variable. (A regional analysis of the 

2-year floods agreed with the regional divisions determined by 

analysis of the 100-year floods.) The final regional equations 

were then developed from application of a generalized leastsquare (GLS) regression model (Stedinger and Tasker, 1985; 

Tasker and Stedinger, 1989) (U.S. Geological Survey computer program GLSNet, version 4.0) for the three regions with 

DRNAREA as the only independent variable (table 4).

The three regions—Eastern Panhandle, Central Mountains, and Western Plateaus (fig. 4)—are separated by topographic features. The boundary between the Eastern Panhandle 

and Central Mountains Regions follows the Potomac River 

Basin boundary. The Central Mountains Region (from northeast to southwest) contains the drainage areas of the Cheat 

River, Tygart Valley River (including the Buckhannon River), 

Elk River upstream from the confluence of Birch River, and 

the New and Gauley Rivers upstream of the Kanawha River. 

The Western Plateaus Region encompasses the remainder of 

the State.

Forty-four streamgage stations were removed from 

the regression analysis (table 1, at the end of this report), 

including 12 stations in West Virginia. Thirty-two stations 

in adjacent states were removed primarily because residual 

plots indicated that the stations were not representative of 

flows expected in West Virginia, except for Potomac River 

at Hancock (ID 34 and streamgage 01613000), Shepherdstown (ID 44 and streamgage 01618000), and Point Of 

Rocks (ID 70 and streamgage 01638500) in Maryland where 

the flood-frequency discharges at these streamgage stations 

with large drainage areas (4,075 to 9,651 mi2) leveraged the 

regional regression equations, resulting in greater estimation 

errors for small drainage areas. The 12 streamgage stations 

removed from the regression analysis in West Virginia are 

Tuscarora Creek above Martinsburg (ID 42 and streamgage 

01617000) because the station was located in a karst area of 

the State (equations developed in this current study are not 

applicable to karst areas of the state); Elk River at Centralia 

(ID 228 and streamgage 03195000) because the peak record 

for this station was used to lengthen the record for Elk River 

below Webster Springs (ID 227 and streamgage 03194700); 

Twelvepole Creek at Wayne (ID 265 and streamgage 

03207000) because the peak record for this station was used 

to lengthen the record for Twelvepole Creek below Wayne 

(ID 266 and streamgage 03207020); Tug Fork near Kermit 

(ID 284 and streamgage 03214000) because the peak record 

for this station was used to lengthen the record for Tug Fork 

at Kermit (ID 285 and streamgage 03214500); New River 

at Caperton (ID 206 and streamgage 03185500) because the 

peak record for this station was used to lengthen the record 

for New River at Fayette (ID 207 and streamgage 03186000); 

Cheat River near Morgantown (ID 124 and streamgage 

03071500) because the peak record for this station was used to 

lengthen the record for Cheat River near Pisgah (ID 123 and 

streamgage 03071000); and Potomac River at Paw Paw (ID 28 

and streamgage 01610000), Shenandoah River at Millville 

(ID 66 and streamgage 01636500), New River at Bluestone 

Dam (ID 188 and streamgage 03180000), New River at 
12 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

OHIO

PENNSYLVANIA

MARYLAND

VIRGINIA

KENTUCKY

81°W 78°W

40°N

38°N

0 20 40 60 MILES

0 20 40 60 KILOMETERS

EXPLANATION

Eastern-Panhandle Region

Central-Mountains Region

Western-Plateaus Region

State boundary

County boundary

Major stream

Base from U.S. Geological Survey 1:100,000 digital line graphics for state boundaries and streams and 

from the West Virginia Department of Environmental Protection 1:24,000 digital data for county boundaries. 

Universal Transverse Mercator projection, zone 17, NAD 83.

Randolph

Kanawha

Greenbrier

Hardy

Fayette

Preston

Grant

Pocahontas

Raleigh

Boone

Roane

Wayne

Nicholas

Clay

Logan

Pendleton

Webster

Mason

Braxton

Wood

Lewis

Mingo

Ritchie

Tucker

Monroe

Jackson

Hampshire

Mercer

Lincoln

Wetzel

Wirt

Wyoming

McDowell

Tyler

Upshur Gilmer

Harrison

Putnam

Cabell

Marion

Barbour

Mineral

Summers

Berkeley

Marshall

Calhoun

Monongalia

Morgan

Taylor

Ohio

Doddridge

Jefferson Pleasants

Brooke

Hancock

Figure 4. The Eastern Panhandle, Central Mountains, and Western Plateaus Regions of West Virginia for which equations for 

estimation of flood frequency discharges were developed in this study.
Development of Flood-Frequency Discharge Equations 13

Table 4. Equations used to estimate selected flood-frequency discharges for streams in the Eastern Panhandle, Central Mountains, 

and Western Plateaus Regions of West Virginia.

[PK(n_n), peak discharge in cubic feet per second for the (n.n)-year recurrence interval; PK(n), peak discharge in cubic feet per second for the (n)-year recurrence interval; %, percent; AOP, annual-occurrence probability; DRNAREA, drainage area in square miles]

Equation

Standard error 

of the model, 

in percent

Average standard 

error of sampling, 

in percent

Average 

prediction error, 

in percent

Equivalent years 

of record, 

unitless

Eastern Panhandle Region (Range in DRNAREA from 0.21 to 1,461 for 57 streamgage stations)

PK1_1(90%AOP) = 29.6 DRNAREA 0.818 43.4 10.3 44.8 3.4

PK1_5(67%AOP) = 46.4 DRNAREA 0.828 35.7 8.9 36.9 3.3

PK2(50%AOP) = 59.8 DRNAREA 0.832 32.1 8.6 33.4 4.1

PK5(20%AOP) = 105 DRNAREA 0.838 25.6 8.9 27.2 10.6

PK10(10%AOP) = 145 DRNAREA 0.842 22.5 9.5 24.5 19.1

PK25(4%AOP) = 204 DRNAREA 0.848 19.7 10.3 22.4 34.1

PK50(2%AOP) = 254 DRNAREA 0.852 18.6 11.1 21.7 46.1

PK100(1%AOP) = 307 DRNAREA 0.855 18.3 11.6 21.7 56.7

PK200(0.5%AOP) = 365 DRNAREA 0.859 18.4 12.4 22.4 64.7

PK500(0.2%AOP) = 447 DRNAREA 0.864 19.4 13.5 23.8 70.9

Central Mountains Region (Range in DRNAREA from 0.10 to 1,619 for 83 streamgage stations)

PK1_1(90%AOP) = 33.4 DRNAREA 0.914 40.0 8.3 41.0 2.4

PK1_5(67%AOP) = 53.8 DRNAREA 0.887 34.6 7.3 35.4 2.0

PK2(50%AOP) = 69.4 DRNAREA 0.873 33.4 7.3 34.2 2.1

PK5(20%AOP) = 116 DRNAREA 0.845 34.1 8.0 35.1 3.2

PK10(10%AOP) = 153 DRNAREA 0.831 36.3 8.6 37.4 4.0

PK25(4%AOP) = 206 DRNAREA 0.816 39.9 9.8 41.2 4.8

PK50(2%AOP) = 250 DRNAREA 0.807 42.9 10.6 44.4 5.3

PK100(1%AOP) = 297 DRNAREA 0.800 46.2 11.3 47.9 5.6

PK200(0.5%AOP) = 347 DRNAREA 0.793 49.7 12.0 51.5 5.9

PK500(0.2%AOP) = 420 DRNAREA 0.785 54.3 13.1 56.3 6.1

Western Plateaus Region (Range in DRNAREA from 0.13 to 1,516 for 106 streamgage stations)

PK1_1(90%AOP) = 56.9 DRNAREA 0.763 38.2 7.6 39.1 3.8

PK1_5(67%AOP) = 97.8 DRNAREA 0.741 33.4 6.5 34.1 2.8

PK2(50%AOP) = 129 DRNAREA 0.730 31.6 6.1 32.2 2.8

PK5(20%AOP) = 221 DRNAREA 0.710 29.3 6.5 30.0 4.4

PK10(10%AOP) = 292 DRNAREA 0.699 28.9 6.5 29.7 5.9

PK25(4%AOP) = 391 DRNAREA 0.688 29.4 7.3 30.3 7.9

PK50(2%AOP) = 472 DRNAREA 0.681 30.2 7.6 31.3 9.1

PK100(1%AOP) = 557 DRNAREA 0.674 31.4 8.0 32.5 10.1

PK200(0.5%AOP) = 647 DRNAREA 0.668 32.7 8.3 33.9 10.8

PK500(0.2%AOP) = 775 DRNAREA 0.661 34.8 8.9 36.1 11.4
14 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

Hinton (ID 203 and streamgage 03184500), New River at Fayette (ID 207 and streamgage 03186000), and Kanawha River 

at Kanawha Falls (ID 224 and streamgage 03193000) because 

the flood-frequency discharges at these stations with large 

drainage areas (4,602 to 8,371 mi2) leveraged the regional 

regression equations, resulting in greater estimation errors for 

small drainage areas.

Accuracy of Flood-Frequency Discharge 

Equations

The accuracy of equations used to estimate discharge is 

quantified by calculating the average prediction error (Tasker 

and Stedinger, 1989; Hodge and Tasker, 1995) and equivalent 

years of record (Hardison, 1969, 1971). Average prediction 

error is the square root of the sum of the squared standard 

error of the model (the portion of the total error due to an 

imperfect model) and the average squared standard error 

of sampling (the portion of the total error due to estimating 

model parameters from a sample), in log units. The average 

prediction errors range from 21.7 to 56.3 percent (table 4). 

The average prediction error is within 3.4 percentage points 

of the standard error of the model for all regression equations, indicating that addition of the average standard error of 

sampling to the standard error of the model accounts for very 

little additional unexplained variance of the flood-frequency 

discharge estimate.

Also, the average prediction error is the square root of 

the average of individual squared standard errors of prediction. Individual standard errors of prediction for the regression equations shown in table 4 were computed over the 

entire range of applicable drainage areas and compared to the 

average prediction errors (fig. 5). The x-axis of figure 5 is not 

to scale because the minimum and maximum drainage areas 

are unequal among regions. The individual standard errors 

of prediction were computed using the matrices presented 

in Appendix 1 and methods described by Hodge and Tasker 

(1995, p. 37–42), Wiley and others (2000, Appendix 1), 

Wiley and others (2002, Appendix 2), and Koltun (2003, 

Appendix A). The individual standard errors of prediction 

increase for drainage areas less than and greater than about 

100 mi2 (where the individual standard errors are 1.0 percentage point less than average prediction error) for all regression 

equations. The maximum individual standard errors of prediction for the maximum drainage areas are within 0.5 percentage point of the average standard error of prediction for all 

regression equations. The maximum individual standard errors 

of prediction for the minimum drainage areas are less than 

5.8 percentage points greater than the average prediction error 

for all regression equations. The individual standard errors of 

prediction are about equal (within 0.3 percentage point) to the 

average prediction error at 10 mi2 for all regression equations. 

In summary, the individual standard errors of prediction are 

within 1.0 percentage point of the average prediction error for 

drainage areas greater than 10 mi2, and the individual standard 

errors of prediction increase to a maximum of 5.8 percentage 

points greater than the average standard error of prediction for 

the minimum drainage areas. 

It is not necessary to compute the individual standard 

errors of prediction when using the regression equations 

developed in this study for drainage areas greater than or equal 

to about 10 mi2 because the differences between the individual 

standard errors of prediction and average prediction error are 

insignificant (within 1.0 percentage point). Also, it is not necessary to compute the individual standard errors of prediction 

for drainage areas less than about 10 mi2 if an additional error 

of up to 5.8 percentage points (the maximum of individual 

standard errors of prediction for the minimum drainage areas) 

is acceptable for the particular application.

Equivalent years of record (table 4) is an estimate of the 

number of systematic years of record that must be collected at 

a streamgage station to calculate flood-frequency discharges 

with an accuracy equal to that of the regional equation. The 

equivalent years of record ranged from 2.0 to 70.9 years. The 

equivalent years of record is not a direct measurement of 

accuracy between equations of flood-frequency discharges. A 

comparison of the equation for PK1_1 (90% AOP) to that for 

PK25 (4% AOP) in the Eastern Panhandle Region shows that 

the equivalent years of record increased 10 times (3.4 to 34.1), 

but the average prediction error decreased only by half (44.8 

to 22.4). Equivalent years of record is a weighting factor that 

is applied when determining flood-frequency discharges at 

streamgage stations.

The high values for the equivalent years of record in the 

Eastern Panhandle Region are atypical compared to values 

for flood-frequency equations in surrounding states and the 

previous study in West Virginia. The atypical high values 

are probably due to (1) a good correlation with the distance 

6

4

2

0

-2

-4

-6

DIFFERENCES, IN PERCENT

DRAINAGE AREA, IN SQUARE MILES

Regional

minimum

Regional

maximum

10 100

NOT TO SCALE

Figure 5. Range of differences (shaded) of the individual 

standard errors of the prediction from the average prediction 

errors for the indicated drainage areas. The graph represents all 

regional equations.
Procedures For Estimating Flood-Frequency Discharges 15

between stations for weighting in the GLS regression compared to the correlations for other regions in this study; (2) 

unusually low residuals for short-term streamgage stations 

(less than 15 years) that have small drainage areas (less than 

5 mi2) compared to residuals for other regions in this study, 

the previous study in West Virginia, and regression studies for 

other hydrologic statistics conducted by the authors; and (3) 

the longer average record length for stations in the Eastern 

Panhandle Region (41) compared to average record lengths in 

the Central Mountains (39) and Western Plateaus (33). 

Procedures For Estimating FloodFrequency Discharges

Estimating procedures for the 1.1- (90-percent AOP), 1.5- 

(67-percent AOP), 2- (50-percent AOP), 5- (20-percent AOP), 

10- (10-percent AOP), 25- (4-percent AOP), 50- (2-percent 

AOP), 100- (1-percent AOP), 200- (0.5-percent AOP), and 

500-year (0.2-percent AOP) flood discharges were developed for streamgage stations and ungaged locations in West 

Virginia.

At a Streamgage Station

A flood-frequency discharge at a streamgage station 

is determined by reading the weighted (Qw) value directly 

from table 3 (at the end of this report). This discharge was 

calculated by weighting (1) the discharge determined from 

the systematic and historical record (Qs in table 3), using the 

guidelines established by the Interagency Advisory Committee 

on Water Data (1982) with the WV skew, and (2) the discharge 

determined by the appropriate regional regression equation (Qr

in table 3). The weighting technique considers (1) the number 

of years of peak-discharge record which equals the number 

of years of systematic record, plus the number of historical peaks, minus the number of high-outlier peaks (values 

from table 2, at the end of this report), and (2) the number of 

equivalent years of record (an estimate given in table 4 of the 

number of systematic years of record for a streamgage station 

necessary to calculate flood-frequency discharges with an 

accuracy equal to that of the regional regression equation). 

The following equation was used.

Qw = (Qs N + Qr EY) / (N + EY) , (4)

where 

Qw is the weighted discharge, in ft3/s;

Qs is the flood-frequency discharge determined 

from the systematic and historical record 

using the guidelines established by the 

Interagency Advisory Committee on Water 

Data (1982), in ft3/s;

Qr is the flood-frequency discharge determined 

from the appropriate regional equation, in 

ft3/s;

N is the number of years of peak-discharge 

record, unitless; and

EY is the equivalent years of record, unitless.

No weighted value was calculated for one of the two 

streamgage stations on the same stream that were combined 

into a single time-series record; the flood-frequency discharge 

near (at) the streamgage station without a weighted value is 

to be determined using procedures for an ungaged location. 

No weighted value was calculated for Tuscarora Creek above 

Martinsburg (ID 42 and streamgage 01617000) because the 

streamgage station is located in a karst area of the State; the 

frequency discharge of the systematic record (Qs) is to be used 

at this station.

At an Ungaged Location 

Four different procedures are used to determine a 

flood-frequency discharge at an ungaged location (1) when 

the ungaged location is upstream from a streamgage station, (2) when the ungaged location is downstream from a 

streamgage station, (3) when the ungaged location is between 

two streamgage stations on the same stream, and (4) when the 

ungaged location is not on the same stream as a streamgage 

station. Two locations were considered to be on the same 

stream when the stream path from the downstream location to 

the basin divide followed the stream segment with the largest 

drainage area at each stream confluence and passed through 

the upstream location.

It is necessary to determine if the ungaged location is 

near a streamgage station, and arithmetic methods are used 

to quantify the definition of “near.” A drainage-area-ratio 

method for estimating statistics at ungaged locations has been 

used by several researchers, including Hayes (1991), Ries and 

Friesz (2000), Flynn (2003), and Wiley (2008). The ratio of 

the drainage areas (RU/K) is defined as the ratio of the drainage area where the flood-frequency discharge is unknown 

(AU) to the drainage area where the flood-frequency discharge 

is known (AK). These researchers use arithmetic methods for 

determining the upstream and downstream limits of the range 

of drainage-area ratios over which flood-frequency discharges 

can be accurately estimated from those at a streamgage station 

using an equation similar to the following:

QU = QK (RU/K)EX , (5)

where

QU is the unknown flood-frequency discharge, in 

ft3/s;

QK is the known flood-frequency discharge, in 

ft3/s;
16 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

RU/K is the ratio of the drainage area at the location 

of the unknown flood-frequency discharge 

(AU) to the drainage area at the location of 

the known flood-frequency discharge (AK), 

unitless; and

EX is the exponent for the particular floodfrequency discharge, unitless.

The 1.1-, 1.5-, 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-

year flood discharges at 88 pairs of streamgage stations located 

on the same stream in West Virginia and adjacent states 

(table 5, at the end of this report) were evaluated to quantify 

“near” for application of the drainage-area-ratio method in this 

study. Two computations, one upstream and one downstream, 

were made for each pair of stations. Ratios of the drainage 

areas for the 176 computations ranged from 0.038 to 26.4. 

Equation 5 was solved for the exponent (EX) as the dependent 

variable: 

Log10 (QU / QK) = EX (Log10 (RU/K)) . (6) 

The exponent was evaluated for the 88 pairs of 

streamgage stations for each flood-frequency discharge using 

simple linear regression with no intercept (regression line goes 

through the graph origin). The values of the exponent (EX) 

for the flood-frequency discharges ranged from 0.68 to 0.79 

(table 6). 

The upstream and downstream limits for application of 

drainage-area ratios used to quantify the definition of “near” 

were determined by plotting the x-axis as the drainage-area 

ratios and the y-axis as the absolute percent differences 

between the flood-frequency discharges at the streamgage 

station (Qw) and the flood-frequency discharges estimated 

by applying (1) the drainage-area-ratio method and (2) the 

regional equations (Qr). S-PLUS 7.0 was used to construct 

locally weighted regression (LOESS) curves (a data-smoothing technique) through differences between flood-frequency 

discharges computed from streamgage-station records and the 

estimated values (selected LOESS parameters were “span = 

0.5; degree = one, locally linear fitted; family = Symmetric, 

no feature for handling outlier distortions, strictly applying 

locally linear fitting”). The absolute percent differences for 

estimates of the 100-year flood made by applying the drainage-area-ratio method are lower than the estimates made by 

applying the regional equation at drainage-area ratios greater 

than about 0.40 (fig. 6). Similar results were determined for all 

flood frequencies estimated in this study, and absolute percent 

differences for all equations were combined to determine 

ratio limits applicable for all flood frequencies (fig. 7). The 

upstream limit used to quantify the definition of “near” for all 

flood frequencies was determined to be 0.40, and the downstream limit was set to the maximum ratios studied, 26.4, 

because no assessment could be made for ratios greater than 

26.4 (table 6). 

The downstream limit of 26.4 for application of drainagearea ratios determined in this study is much greater than 

values determined by Hayes (1991), Ries and Friesz (2000), 

and Flynn (2003), probably because the streamgage stations 

used to compute ratios in this study were limited to those on 

the same stream (the stream path from the downstream location to the basin divide followed the stream segment with the 

largest drainage area at each stream confluence and passed 

through the upstream location). The downstream limit of 26.4 

determined in this study is much greater than the value of 4.76 

determined by Wiley (2008), but both studies used LOESS 

plots to set the downstream limit to the maximum ratio 

studied. 

The upstream limit of 0.40 for application of drainagearea ratios determined in this study was equal to that determined by Wiley (2008) for flood frequencies at and below the 

10-year recurrence interval. The upstream limit of 0.21 for 

flood frequencies at and above the 25-year recurrence interval 

determined by Wiley (2008) is superseded by the value 0.40 

determined in this study because more than three times as 

many pairs of stations were used to determine the value in this 

study (26 pairs compared to 88 pairs).

Table 6. Values of the exponent, and upstream and downstream 

limits of the drainage-area ratios used to quantify the definition 

of “near” for estimating selected flood-frequency discharges for 

ungaged locations in West Virginia.

[EX, exponent; RUS, upstream limit of the drainage-area ratio; RDS, downstream limit of the drainage-area ratio; PK(n_n), peak discharge in cubic feet 

per second for the (n.n)-year recurrence interval; PK(n), peak discharge in 

cubic feet per second for the (n)-year recurrence interval; %, percent; AOP, 

annual-occurrence probability]

Statistic EX RUS RDS

PK1_1(90%AOP) 0.79 0.40 26.4

PK1_5(67%AOP) .76 .40 26.4

PK2(50%AOP) .75 .40 26.4

PK5(20%AOP) .73 .40 26.4

PK10(10%AOP) .72 .40 26.4

PK25(4%AOP) .71 .40 26.4

PK50(2%AOP) .70 .40 26.4

PK100(1%AOP) .70 .40 26.4

PK200(0.5%AOP) .69 .40 26.4

PK500(0.2%AOP) .68 .40 26.4
Procedures For Estimating Flood-Frequency Discharges 17

Upstream limit of the drainage-area 

ratios used to quantify the definition of 

"near" for estimating statistics is 0.40

Drainage-area ratios

Regional equations

0.0 0.1 1.0 10.0 100.0

RATIO OF DRAINAGE AREAS, UNITLESS

50

100

150

200

ABSOLUTE DIFFERENCE, IN PERCENT

0

Figure 6. LOESS curves 

of the absolute difference 

between the 100-year 

(1-percent annualoccurrence probability) 

flood discharges 

determined at streamgage 

stations and values 

estimated from the (1) 

drainage-area ratio method 

and (2) regional equations, 

in relation to the ratios of 

the drainage areas.

0.01 0.10 1.00 10.00 100.00

RATIO OF DRAINAGE AREAS, UNITLESS

0

50

100

150

200

ABSOLUTE DIFFERENCE, IN PERCENT

Drainage-area ratios

Regional equations

Upstream limit of the drainage-area 

ratios used to quantify the definition of 

"near" for estimating statistics is 0.40

Figure 7. LOESS curves 

of the absolute difference 

between the 1.1- through 

500-year (90- through 

0.2-percent annualoccurrence probabilities) 

flood discharges 

determined at streamgage 

stations and values 

estimated from the (1) 

drainage-area ratio method 

and (2) regional equations, 

in relation to the ratios of 

the drainage areas.
18 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

Upstream From a Streamgage Station 

This procedure is used when there is a streamgage station 

downstream from the ungaged location but none upstream 

on the same stream. The hydrologic assumption for this 

circumstance is that the conditions affecting flood-frequency 

discharges, such as land cover, basin topography, and climatic 

conditions, are unchanged upstream from the streamgage station. Mathematically, the values of flood-frequency discharges 

are proportioned by drainage area. It is suggested that a 

streamgage be established when RU/K is less than or equal to 

the upstream limit of the ratio of drainage areas (RUS) (table 6). 

The following equation is used to estimate flood-frequency 

discharges:

QU = QK (RU/K)EX , (7)

where

QU is the unknown flood-frequency discharge, 

in ft3/s;

QK is the known flood-frequency discharge 

(table 3), in ft3/s;

RU/K is the ratio of the drainage area at the location 

of the unknown flood-frequency discharge 

(AU) to the drainage area at the location of 

the known flood-frequency discharge (AK), 

unitless; and

EX is the exponent for the particular floodfrequency discharge (table 6), unitless.

In this method, it is not assumed that the conditions 

affecting flood-frequency discharges change in the upstream 

direction toward the regional tendency. The critical situation 

for this assumption is where the unknown location approaches 

the headwaters of a stream. This assumption might be acceptable if the flood-frequency discharge at the known location 

is less than that estimated by applying the regional equation 

at the known location because the upstream estimate of the 

flood-frequency discharge would be greater, and therefore, 

more conservative from a flood inundation perspective than 

that determined using the method presented. However, this 

assumption would be unacceptable if the flood-frequency 

discharge at the known location is greater than that estimated 

by applying the regional equation because the upstream 

estimate of flood-frequency discharge would be less than that 

determined using the method presented, thus requiring an 

assumption of reducing unit inflow. The method presented 

would require establishing a streamgage station in order to 

reduce unit inflow when the known flood-frequency discharge 

is greater than that estimated using the regional equation.

Downstream From a Streamgage Station

This procedure is used when there is a streamgage station 

upstream from the ungaged location but none downstream 

on the same stream. The hydrologic assumption for this 

circumstance is that the conditions affecting flood-frequency 

discharges at the streamgage station change, in the downstream direction, toward those of the regional tendency. The 

conditions affecting flood-frequency discharges in the vicinity 

of the streamgage station could be atypical impervious land 

cover, unusual basin slope, uncommon basin orientation, or 

diversion of storm runoff that likely would not significantly 

affect flood-frequency discharges if the drainage area were 

larger and, therefore, conditions were more similar to the 

regional tendency. Mathematically, the value of a flood-frequency discharge is changed to that estimated by applying the 

regional equation as RU/K approaches the downstream limit of 

the ratio of drainage areas (RDS) (table 6). It is suggested that 

a streamgage be established when RU/K is greater than or equal 

to RDS . The flood-frequency discharge is estimated by applying the regional equation when RU/K is greater than or equal to 

RDS , and the following equation is used to estimate the floodfrequency discharge when RU/K is less than RDS :

QU = QUE + (QK – QKE) (RDS – RU/K) / (RDS – 1) , (8)

when

RU/K < RDS ; and

where

QU is the unknown flood-frequency discharge, 

in ft3/s;

QUE is the regional equation (table 4) evaluated 

at the location of the unknown floodfrequency discharge, in ft3

/s;

QK is the known flood-frequency discharge 

(table 3), in ft3/s;

QKE is the regional equation (table 4) evaluated at 

the location of the known flood-frequency 

discharge, in ft3/s; 

RDS is the downstream limit of the ratio of 

drainage areas (table 6), unitless; and

RU/K is the ratio of the drainage area at the location 

of the unknown flood-frequency discharge 

(AU) to the drainage area at the location of 

the known flood-frequency discharge (AK), 

unitless.

Between Streamgage Stations 

This procedure is used when there are streamgage stations both upstream and downstream from the ungaged location on the same stream. The hydrologic assumption for this 

circumstance is that the conditions affecting flood-frequency 

discharges are changing on the basis of the relation between 

the flood-frequency discharges at the streamgage stations, the 

ratios of the drainage areas, and differences between regional 

hydrologic conditions and those that affect flood-frequency 

discharges at the stations. It is suggested that a streamgage be 

established when RU/K is greater than RDS and less than RUS , 
Procedures For Estimating Flood-Frequency Discharges 19

and when one of the values of the flood-frequency discharge 

at the upstream and downstream locations is greater than, and 

one of the values is less than, that estimated by applying the 

regional equation. Two alternative hydrologic assumptions are 

described in detail below.

Hydrologic Conditions Change Linearly between 

Streamgage Stations 

This hydrologic assumption is that the conditions affecting flood-frequency discharges at the upstream streamgage station change linearly with drainage area to those at the downstream location when (1) both streamgage stations are near the 

ungaged location, or (2) both streamgage stations are not near 

the ungaged location, but the hydrologic conditions affecting 

flood-frequency discharges at the stations and ungaged location are consistent. The conditions affecting flood-frequency 

discharges between the upstream and downstream locations 

are well defined by streamgage stations when both are near 

the ungaged location; the conditions affecting flood-frequency 

discharges are consistent from the upstream to the downstream 

location when neither is near the ungaged location and the 

conditions at both stations are more similar to each other than 

to the regional hydrologic conditions. Mathematically, the 

value of flood-frequency discharges changes linearly with 

respect to drainage area from the upstream to the downstream 

value when (1) RU/K is less than RDS at the upstream location 

and RU/K is greater than RUS at the downstream location; or (2) 

RU/K is greater than or equal to RDS at the upstream location, 

RU/K is less than or equal to RUS at the downstream location, 

and the discharges of the flood frequencies at the upstream and 

downstream locations are both greater than or both less than 

those estimated by applying the regional equation. The following equation is used to estimate the flood-frequency discharge 

under the limitations described above:

QU = [QUS (ADS – AU) + QDS (AU – AUS)] / (ADS – AUS) , (9)

when

RU/K < RDS at upstream location and 

RU/K > RUS at downstream location, 

or when 

RU/K ≥ RDS at upstream location and 

RU/K ≤ RUS at downstream location; and

QKE at the upstream location > QUS and 

QKE at the downstream location > QDS or

QKE at the upstream location < QUS and 

QKE at the downstream location < QDS ; and

where

QU is the unknown flood-frequency discharge, in 

ft3/s;

QUS is the flood-frequency discharge at the 

upstream location (table 3), in ft3/s;

QDS is the flood-frequency discharge at the 

downstream location (table 3), in ft3/s;

QKE is the regional equation evaluated at the 

location of the known flood-frequency 

discharge, in ft3/s;

AU is the drainage area at the location of the 

unknown flood-frequency discharge, in 

mi2;

AUS is the drainage area at the upstream location 

(table 2), in mi2;

ADS is the drainage area at the downstream 

location (table 2), in mi2; 

RUS is the upstream limit of the ratio of drainage 

areas (table 5), unitless; and

RDS is the downstream limit of the ratio of 

drainage areas (table 5), unitless.

Hydrologic Conditions Change Linearly to the Regional 

Hydrologic Conditions between Streamgage Stations

This hydrologic assumption is that the conditions affecting flood-frequency discharges at the streamgage station 

change linearly with drainage area to those represented by 

the regional equation when neither streamgage station is near 

the ungaged location and the hydrologic conditions affecting 

flood-frequency discharges at the two stations are inconsistent. 

The conditions affecting flood discharges can vary greatly 

as a result of factors such as (1) significant changes in land 

cover, basin topography, or climatic conditions; (2) input 

from a tributary stream that is hydrologically different from 

the stream on which the streamgage station is located or from 

regional hydrologic conditions; or (3) transfer of storm runoff 

into or out of the basin. Mathematically, the hydrologic conditions are inconsistent if one of the flood-frequency discharges 

at the upstream and downstream locations is greater than and 

one of the flood-frequency discharges is less than those estimated by applying the regional equation—that is, the floodfrequency discharge changes from a value greater than the 

flood-frequency discharge estimated by applying the regional 

equation at the upstream location to a value equal to the floodfrequency discharge estimated from the regional equation, 

and then to a value less than the flood-frequency discharge 

estimated from the regional equation at the downstream location, or the reverse. The regional equation (table 4) is applied 

to estimate the flood-frequency discharge if RU/K is greater than 

or equal to RDS at the upstream location and RU/K is less than or 

equal to RUS at the downstream location. Equation 8 presented 

in the section “Downstream from a Streamgage Station” is 

used to estimate the flood-frequency discharge if RU/K is less 

than RDS at the upstream location and RU/K is less than or equal 
20 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

to RUS at the downstream location. The following equation 

is used to estimate the flood-frequency discharge if RU/K is 

greater than or equal to RDS at the upstream location and RU/K is 

greater than RUS at the downstream location: 

QU = QUE + (QK – QKE) (RU/K – RUS) / (1 – RUS) , (10)

when 

RU/K ≥ RDS at upstream location and 

RU/K > RUS at downstream location, and

where

	 QU is the unknown flood-frequency discharge, in 

ft3/s;

	 QUE is the regional equation (table 4) evaluated 

at the location of the unknown floodfrequency discharge, in ft3

/s;

	 QK is the known flood-frequency discharge 

(table 3), in ft3/s;

	 QKE is the regional equation (table 4) evaluated at 

the location of the known flood-frequency 

discharge, in ft3/s;

	 RDS	 is the downstream limit of the ratio of 

drainage areas (table 5), unitless;

	 RUS is the upstream limit of the ratio of drainage 

areas (table 5), unitless; and

	 RU/K	 is the ratio of the drainage area at the location 

of the unknown flood-frequency discharge 

(AU) to the drainage area at the location of 

the known flood-frequency discharge (AK), 

unitless.

Not on the Same Stream as a Streamgage 

Station 

This procedure is used when there is no streamgage station on the same stream as the ungaged location. The hydrologic assumption for this circumstance is that the conditions 

affecting flood-frequency discharges are those represented by 

the regional equation. A streamgage station could be established when there is no streamgage station on the same stream 

as the ungaged location. Mathematically, the flood-frequency 

discharge is estimated by applying the regional equation 

(table 4). 

Example Applications 

Estimates of flood-frequency discharges are made by 

directly reading from table 3 when the location of interest is at 

a streamgage station, or using one of the four procedures at an 

ungaged location: (1) when the ungaged location is upstream 

from a streamgage station, (2) when the ungaged location is 

downstream from a streamgage station, (3) when the ungaged 

location is between two streamgage stations on the same 

stream, and (4) when the ungaged location is not on the same 

stream as a streamgage station.

• At a streamgage station: A flood-frequency discharge 

for a streamgage station is determined by reading the 

weighted (Qw) value from table 3. For example, the 

500-year flood discharge (PK500, 0.2-percent AOP) 

at the streamgage station Big Coal River at Ashford (ID 238 and streamgage 03198500) is given as 

50,300 ft3/s. 

• Upstream from a streamgage station: The 50-year 

flood discharge (PK50, 2-percent AOP) for the South 

Fork South Branch Potomac River just downstream 

from the confluence of George Run in Pendleton 

County (Sugar Grove 71⁄2-minute U.S. Geological 

Survey topographic map) and upstream from the 

streamgage station at Brandywine (ID 19 and 

streamgage 01607500) can be calculated using equation 7. The known 50-year flood discharge (QK) at the 

Brandywine streamgage station is 18,600 ft3/s (the 

value for Qw from table 3). The drainage area at the 

unknown location (AU) is 84.56 mi2 (Wiley and others, 2007, p. 29), and the drainage area at the known 

location (AK) is 103 mi2 (table 2). The exponent (EX) 

for the 50-year flood discharge is 0.70 (table 6). RU/K

(which equals AU / AK) is calculated to be 0.82, which 

is greater than the upstream limit of the ratio of drainage areas, 0.40 (RUS from table 6), indicating that the 

installation of a streamgage station is not suggested. 

The 50-year flood discharge of the South Fork South 

Branch Potomac River just downstream from the confluence of George Run is calculated from equation 7 to 

be 16,200 ft3/s. 

• Downstream from a streamgage station: The 2-year 

flood discharge (PK2, 50-percent AOP) for Sand Run 

just downstream from the confluence of Laurel Fork 

in Upshur County (Century 71⁄2-minute U.S. Geological Survey topographic map) and downstream from 

the streamgage station near Buckhannon (ID 90 and 

streamgage 03052500) can be calculated using equation 8. (No other streamgage station is present downstream from Sand Run near Buckhannon on the same 

stream.) The known 2-year flood discharge (QK) at the 

Buckhannon streamgage station is 794 ft3/s (the value 

for Qw from table 3). The drainage area at the unknown 

location (AU) is 27.56 mi2 (Stewart and Mathes, 1995, 

p. 19), and the drainage area at the known location 

(AK) is 14.3 mi2 (table 2). The result of the regional 

equation calculation at the unknown location (QUE) 

is 1,260 ft3/s (Central Mountains Region determined 

from fig. 4, equation from table 4) and for the known 

location (QKE) is 708 ft3/s. RU/K (which equals AU / AK) 

was calculated to be 1.93, which is less than the 

downstream limit of the ratio of drainage areas, 26.4 

(RDS from table 6). The drainage areas are within the 
Summary 21

limits of the regional equation from 0.10 to 1,619 mi2

(table 4), indicating that the procedure is valid and that 

the installation of a streamgage station is not suggested. The 2-year flood discharge of Sand Run just 

downstream from the confluence of Laurel Fork was 

calculated from equation 8 to be 1,340 ft3/s. 

• Between two streamgage stations on the same 

stream: The 100-year flood discharge (PK100, 

1-percent AOP) for the Greenbrier River just downstream from the confluence of Wolf Creek in Monroe County (Alderson 71⁄2-minute U.S. Geological 

Survey topographic map), downstream from the 

streamgage station at Alderson (ID 198 and streamgage 

03183500), and upstream from the streamgage station 

at Hilldale (ID 201 and streamgage 03184000) can 

be calculated using equation 9. The upstream 100-

year flood discharge (QUS) at the Alderson streamgage 

station is 80,400 ft3/s, and the downstream 100-year 

flood discharge (QDS) at the Hilldale streamgage station is 85,400 ft3

/s (the values for Qw from table 3). 

The drainage area at the unknown location (AU) is 

1,535.79 mi2 (Mathes and others, 1982, p. 55), the 

upstream drainage area at the Alderson streamgage 

station (AUS) is 1,364 mi2 (table 2), and the downstream 

drainage area at the Hilldale gaging station (ADS) is 

1,619 mi2. RU/K (which equals AU / AK) at the upstream 

location was calculated to be 1.13, which is less than 

the downstream limit of the ratio of drainage areas, 

26.4 (RDS from table 6). RU/K at the downstream location was calculated to be 0.95, which is greater than 

the upstream limit of the ratio of drainage areas, 0.40 

(RUS table 6), indicating that the procedure is valid and 

that installation of a streamgage is not suggested. The 

100-year flood discharge of the Greenbrier River just 

downstream from the confluence of Wolf Creek was 

calculated from equation 9 to be 83,800 ft3/s. 

• Not on the same stream as a streamgage station:

The 10-year flood discharge (PK10, 10-percent AOP) 

for Fishing Creek just downstream from the confluence 

of North and South Forks of Fishing Creek in Wetzel 

County (Pine Grove 71⁄2-minute U.S. Geological 

Survey topographic map) can be calculated from the 

regional equation. (There are no streamgage stations on 

Fishing Creek or South Fork Fishing Creek that could 

have been on the same stream.) The streams are in 

the Western Plateaus Region (fig. 4), and the drainage 

area is 113.92 mi2 (Wiley, 1997, page 30). The drainage area is within the limits of the regional equation 

from 0.13 to 1,516 mi2 (table 4), indicating that the 

procedure is valid, but that installation of a streamgage 

station could improve the estimate. The 10-year flood 

discharge was calculated from the regression equation for the Western Plateaus Region (table 4) to be 

8,000 ft3/s.

Limitations of Procedures for Estimating FloodFrequency Discharges

Procedures developed in this study are applicable only 

to rural, unregulated streams located within the boundaries 

of West Virginia. Procedures also are limited to the range 

of drainage areas used to develop the equations—from 0.21 

to 1,461 mi2 in the Eastern Panhandle Region, from 0.10 to 

1,619 mi2 in the Central Mountains Region, and from 0.13 to 

1,516 mi2 in the Western Plateaus Region. The procedures are 

not meant to be applied to urban areas with paved surfaces, 

concrete channels, or culverts that substantially increase 

runoff or decrease infiltration. The procedures are not meant 

to be applied to streams regulated by dams or with large lakes 

and ponds that substantially retain runoff. Procedures are 

not applicable to heavily mined areas if excessive runoff is 

diverted into or outside the basin, retained along strip benches, 

or retained underground. Procedures are not applicable to 

karst areas if excessive runoff is diverted into, outside, or 

deep within the basin through solution channels or other 

cavities in carbonate (limestone and dolomite) rocks. Jones 

(1997) describes the locations of karst areas in eastern counties of West Virginia, including parts of Monongalia, Preston, 

Barbour, Tucker, Grant, Mineral, Hardy, Hampshire, Morgan, 

Berkeley, Jefferson, Randolph, Pendleton, Pocahontas, Greenbrier, Summers, Monroe, and Mercer (counties are shown in 

fig. 4).

Summary

Flood-frequency discharges were determined for 290 

streamgage stations on rural, unregulated streams in West 

Virginia and adjacent states that have a minimum of 9 years 

of record through the 2006 or 2007 water year. This study was 

conducted by the USGS, in cooperation with the West Virginia 

Department of Transportation, Division of Highways. West 

Virginia skew coefficients were used instead of the United 

States skew coefficients used in previous studies in West 

Virginia. Flood-frequency discharges and skew coefficients for 

stations in adjacent states are applicable only for determining 

estimates in West Virginia and do not supersede values used in 

the adjacent states. 

The results of a correlation analysis of 36 log10-transformed basin characteristics available for the 290 streamgage 

stations reduced the number of characteristics to 32 for consideration as independent variables in the regression analysis. Elongation ratio (ER), rotundity of basin (RB), channel 

maintenance (CM), and basin width (BW) were removed from 

consideration as independent variables because the Pearson’s 

coefficient was equal to 1 (singularity) for this group of basin 

characteristics.

Regression analysis was conducted using log10-transformed flood-frequency discharges as dependent variables 

and log10-transformed basin characteristics as independent 
22 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

variables for 246 streamflow stations. Forty-four streamflow stations were excluded from the analysis because the 

(1) peak data were used to lengthen records for other nearby 

streamgage stations, (2) station is located in a karst area, (3) 

plot of the regression residual indicated the station was not 

representative of West Virginia, and (4) station has a large 

drainage area and leveraged the regression equation, affecting 

estimates for small drainage areas. Residuals from multiple 

and simple least-squares regression models of the 100-year 

(1-percent AOP) flood discharge with independent variables 

describing the basin characteristics were used to determine 

drainage area as the only significant independent variable and 

to delineate boundaries of three regions in West Virginia—

Eastern Panhandle, Central Mountains, and Western Plateaus. 

Regional equations for the 1.1- (90-percent AOP), 1.5- 

(67-percent AOP), 2- (50-percent AOP), 5- (20-percent AOP), 

10- (10-percent AOP), 25- (4-percent AOP), 50- (2-percent 

AOP), 100- (1-percent AOP), 200- (0.5-percent AOP), and 

500-year (0.2-percent AOP) flood discharges were determined 

by executing a generalized least-squares regression model. 

Drainage area was the only significant independent variable 

determined for all equations in all regions.

The 246 streamgage stations were reduced to 125 for 

consideration in the trend analysis. For the trend analysis, 

streamgage stations with a minimum of 30 years of record 

were considered in order to eliminate effects that might be due 

to climate variability. Twelve streamgage stations indicated a 

trend, twice as many as would be expected by chance, but the 

stations were about equally divided between those having a 

positive trend and those having a negative trend. No significance was determined for the streamgage stations having a 

trend.

The accuracy of estimating equations was quantified by 

measuring the average prediction error and equivalent years of 

record. The average prediction error ranged from 21.7 to 56.3 

percent, and the equivalent years of record ranged from 2.0 to 

70.9 years. 

Procedures for estimating flood-frequency discharges at a 

streamgage station and at an ungaged location are presented in 

the text of this report. The procedures for an ungaged location 

include a combination of (1) estimates based on drainage-area 

ratios between stations and ungaged locations on the same 

stream and (2) estimates from regional equations. Examples of 

the procedures are presented in the text.

Equations developed in this study are applicable only 

to rural, unregulated streams located within the boundaries 

of West Virginia. Equation application is limited to the range 

of drainage areas used in equation development—from 0.21 

to 1,461 mi2 in the Eastern Panhandle Region, from 0.10 to 

1,619 mi2 in the Central Mountains Region, and from 0.13 to 

1,516 mi2 in the Western Plateaus Region. The authors suggest 

using caution in evaluating the results if the equations are 

applied to heavily mined or karst areas. 

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Table 1 25

Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number 

Streamgage 

station number Streamgage-station name State WV skew, unitless U.S. skew, unitless

Difference 

between 

WV and US 

skews, 

unitless

Weighted WV 

and station 

skews, 

unitless

Mean of log10-

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

Standard 

deviation of log10- 

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

1 01595000 North Branch Potomac River at Steyer MD 0.594 0.337 0.257 0.376 3.531 0.2452 01595300 Abram Creek at Oakmont WV .523 .348 .175 1.093 3.127 .1933 01595500 North Br. Potomac River at Kitzmiller MD .568 .344 .224 .900 3.914 .2324 01596000 North Br. Potomac River at Bloomington MD .549 .351 .198 .466 3.924 .2595 01596500 Savage River near Barton MD .565 .335 .230 .639 3.194 .2236 01597000 Crabtree Creek near Swanton MD .543 .334 .209 .722 2.714 .2677 01598000 Savage River at Bloomington MD .553 .350 .203 .628 3.561 .2598 01599000 Georges Creek at Franklin MD .535 .354 .181 .502 3.289 .2349 01599500 New Creek near Keyser WV .475 .371 .104 .060 3.013 .302

10 01600000 North Branch Potomac River at Pinto MD .516 .366 .150 .500 4.215 .259

11 01601500 Wills Creek near Cumberland MD .595 .358 .237 .792 3.817 .255

12 01603000 N. Br. Potomac River near Cumberland MD .529 .365 .164 .697 4.270 .21113 01604500 Patterson Creek near Headsville WV .430 .383 .047 .017 3.565 .30014 01605500 South Branch Potomac River at Franklin WV .700 .419 .281 .450 3.681 .34115 01605700 Reeds Creek Tributary near Franklin WV .800 .401 .399 .644 1.322 .22916 01606000 N. Fk. S. Br. Potomac River at Cabins WV .824 .389 .435 .874 3.942 .25117 01606500 S. Br. Potomac River near Petersburg WV .802 .396 .406 .719 4.149 .27618 01606800 Brushy Run near Petersburg WV .689 .415 .274 .551 1.622 .37719 01607500 S. Fk. S. Br. Potomac R. at Brandywine WV .659 .433 .226 .816 3.560 .32920 01607510 Heavener Run near Brandywine WV .715 .435 .280 .500 1.512 .30721 01608000 S. Fk. S. Br. Potomac R. near Moorefield WV .671 .423 .248 .621 3.805 .31122 01608100 Williams Hollow near Moorefield WV .391 .419 -.028 .125 1.669 .14223 01608500 S. Br. Potomac River near Springfield WV .691 .398 .293 .598 4.385 .29524 01609000 Town Creek near Oldtown MD .510 .393 .117 .146 3.591 .25525 01609500 Sawpit Run near Oldtown MD .425 .394 .031 .580 2.445 .19326 01609650 Little Cacapon River at Frenchburg WV .303 .414 -.111 .198 3.034 .36027 01609800 Little Cacapon River near Levels WV .322 .406 -.084 .324 3.593 .223
26 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number Streamgage-station name State WV skew, unitless U.S. skew, unitless Difference between WV and US skews, unitless Weighted WV and station skews, unitless Mean of log10- transformed flood-frequency discharges, in cubic feet per second Standard deviation of log10- transformed flood-frequency discharges, in cubic feet per second 28 01610000 Potomac River at Paw Paw WV .457 .404 .053 .465 4.637 .214 29 01610150 Bear Creek at Forest Park MD .454 .395 .059 .213 2.585 .288 30 01610155 Sideling Hill Creek at Bellegrove MD .481 .399 .082 .169 3.569 .333 31 01610500 Cacapon River at Yellow Spring WV .242 .446 -.204 .085 3.875 .362 32 01611500 Cacapon River near Great Cacapon WV .306 .411 -.105 .025 4.115 .318 33 01612500 Little Tonoloway Creek near Hancock MD .246 .400 -.154 .225 2.730 .271 34 01613000 Potomac River at Hancock MD .435 .407 .028 .494 4.745 .240 35 01613150 Ditch Run near Hancock MD .391 .412 -.021 .322 2.387 .231 36 01613160 Potomac River Tributary near Hancock MD .418 .412 .006 .519 2.036 .166 37 01613900 Hogue Creek near Hayfield VA .411 .462 -.051 -.130 2.925 .348 38 01614000 Back Creek near Jones Springs WV .210 .445 -.235 .310 3.761 .250 39 01615000 Opequon Creek near Berryville VA .252 .488 -.236 .081 3.388 .315 40 01616000 Abrams Creek near Winchester VA .211 .487 -.276 -.020 2.734 .281 41 01616500 Opequon Creek near Martinsburg WV .218 .470 -.252 .157 3.659 .307 42 01617000 Tuscarora Creek above Martinsburg WV .243 .459 -.216 .294 2.235 .253 43 01617800 Marsh Run at Grimes MD .306 .481 -.175 .023 2.012 .339 44 01618000 Potomac River at Shepherdstown MD .318 .490 -.172 .322 4.837 .224 45 01619475 Dog Creek Tributary near Locust Grove MD .322 .507 -.185 .417 1.354 .360

46 01619500 Antietam Creek near Sharpsburg MD .363 .498 -.135 .288 3.428 .27347 01620500 North River near Stokesville VA .560 .471 .089 .492 2.894 .39848 01621000 Dry River at Rawley Springs VA .611 .477 .134 .911 3.393 .27049 01621200 War Branch near Hinton VA .537 .490 .047 .464 2.759 .27350 01621400 Blacks Run at Harrisonburg VA .453 .506 -.053 .585 2.691 .18651 01621450 Blacks Run Tributary near Harrisonburg VA .462 .507 -.045 .728 1.644 .25352 01622000 North River near Burketown VA .550 .514 .036 .587 3.861 .29153 01622100 North River Tributary at Mount Crawford VA .445 .513 -.068 .243 1.778 .27854 01622300 Buffalo Branch Trib. near Agusta Springs VA .340 .489 -.149 .320 1.733 .165
Table 1 27

Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number 

Streamgage 

station number Streamgage-station name State WV skew, unitless U.S. skew, unitless

Difference 

between 

WV and US 

skews, 

unitless

Weighted WV 

and station 

skews, 

unitless

Mean of log10-

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

Standard 

deviation of log10- 

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

55 01622400 Buffalo Branch Tributary near Christian VA .378 .492 -.114 .511 1.760 .26056 01632000 N. Fk. Shenandoah R. at Cootes Store VA .515 .482 .033 .010 3.909 .29357 01632300 Long Meadow near Broadway VA .413 .499 -.086 .395 2.137 .40758 01632900 Smith Creek near New Market VA .382 .496 -.114 -.010 3.328 .37359 01632950 Crooked Run Tributary near Conicville VA .347 .474 -.127 .151 1.363 .19860 01632970 Crooked Run near Mount Jackson VA .343 .482 -.139 .244 2.421 .36361 01633000 N. Fk. Shenandoah R. at Mount Jackson VA .439 .489 -.050 .040 4.037 .29262 01633500 Stony Creek at Columbia Furnace VA .336 .475 -.139 .300 3.327 .28663 01633650 Pughs Run near Woodstock VA .243 .475 -.232 .224 2.059 .37264 01634000 N. Fk. Shenandoah River near Strasburg VA .378 .489 -.111 .416 4.077 .31465 01634500 Cedar Creek near Winchester VA .199 .476 -.277 .205 3.524 .34066 01636500 Shenandoah River at Millville WV .359 .515 -.156 .154 4.524 .29867 01637000 Little Catoctin Creek at Harmony MD .332 .522 -.190 .344 2.766 .40568 01637500 Catoctin Creek near Middletown MD .336 .529 -.193 .141 3.402 .31169 01638480 Catoctin Creek at Taylorstown VA .287 .554 -.267 -.070 3.584 .36470 01638500 Potomac River at Point Of Rocks MD .228 .556 -.328 .236 5.018 .22871 01643700 Goose Creek near Middleburg VA .247 .558 -.311 .101 3.596 .36972 01644000 Goose Creek near Leesburg VA .268 .593 -.325 .341 3.880 .33573 01644100 South Fork Sycolin Creek near Leesburg VA .286 .579 -.293 .228 2.599 .28274 02009500 Cattail Run near Bolar VA .338 .416 -.078 .385 1.512 .10175 02011400 Jackson River near Bacova VA .238 .413 -.175 .537 3.584 .24576 02011460 Back Creek near Sunrise VA .419 .405 .014 .489 3.469 .22677 02011480 Back Cr. at Rt. 600 near Mountain Grove VA .344 .404 -.060 .096 3.643 .17778 02011500 Back Creek near Mountain Grove VA .258 .407 -.149 -.120 3.770 .20079 02012500 Jackson River at Falling Spring VA .136 .417 -.281 -.260 4.003 .23680 02012950 Sweet Spgs. Cr. Trib. at Sweet Chaylbeate VA .003 .413 -.410 -.140 1.562 .60281 02013000 Dunlap Creek near Covington VA .015 .417 -.402 .068 3.725 .254
28 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number Streamgage-station name State WV skew, unitless U.S. skew, unitless Difference between WV and US skews, unitless Weighted WV and station skews, unitless Mean of log10- transformed flood-frequency discharges, in cubic feet per second Standard deviation of log10- transformed flood-frequency discharges, in cubic feet per second 82 02014000 Potts Creek near Covington VA .001 .425 -.424 -.130 3.595 .241 83 03050000 Tygart Valley River near Dailey WV .546 .320 .226 .334 3.841 .170 84 03050500 Tygart Valley River near Elkins WV .587 .306 .281 .471 3.874 .137 85 03050650 Unnamed Run at Gilman WV .608 .306 .302 .758 1.700 .284 86 03051000 Tygart Valley River at Belington WV .579 .284 .295 .291 4.016 .139 87 03051500 Middle Fork River at Midvale WV .424 .276 .148 .278 3.695 .199 88 03052000 Middle Fork River at Audra WV .412 .265 .147 .231 3.789 .177 89 03052340 Mud Lick Run near Buckhannon WV .124 .246 -.122 .221 2.197 .191 90 03052500 Sand Run near Buckhannon WV .274 .265 .009 .356 2.916 .243 91 03053500 Buckhannon River at Hall WV .249 .257 -.008 -.210 3.870 .141 92 03054500 Tygart Valley River at Phillipi WV .432 .251 .181 .234 4.355 .152 93 03055020 Bonica Run on U.S. 250 near Phillipi WV .361 .260 .101 .070 1.828 .263 94 03055040 Bonica Run on Route 38 near Phillipi WV .363 .259 .104 .352 2.333 .271 95 03056250 Three Fork Creek near Grafton WV .375 .227 .148 .284 3.683 .176 96 03056500 Tygart Valley River at Fetterman WV .421 .219 .202 .328 4.498 .155 97 03056600 Right Fk. Wickwire Run near Grafton WV .319 .225 .094 .104 2.310 .230 98 03057300 West Fork River at Walkersville WV .086 .238 -.152 .072 3.197 .205 99 03057500 Skin Creek near Brownsville WV .042 .226 -.184 -.160 3.107 .130

100 03058000 West Fork R. blw Stonewall Jackson Dam nr Weston WV .034 .218 -.184 .126 3.507 .172101 03058500 West Fork River at Butcherville WV .010 .205 -.195 -.060 3.781 .183102 03059000 West Fork River at Clarksburg WV -.024 .191 -.215 -.310 3.993 .147103 03059500 Elk Creek at Quiet Dell WV .135 .206 -.071 .029 3.423 .262104 03060500 Salem Fork at Salem WV -.083 .165 -.248 -.190 2.908 .301105 03061000 West Fork River at Enterprise WV -.001 .178 -.179 -.130 4.243 .179106 03061500 Buffalo Creek at Barrackville WV .030 .178 -.148 -.060 3.714 .148107 03062400 Cobun Creek at Morgantown WV .314 .190 .124 .575 2.700 .272108 03062500 Deckers Creek at Morgantown WV .365 .187 .178 .363 3.195 .256
Table 1 29

Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number 

Streamgage 

station number Streamgage-station name State WV skew, unitless U.S. skew, unitless

Difference 

between 

WV and US 

skews, 

unitless

Weighted WV 

and station 

skews, 

unitless

Mean of log10-

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

Standard 

deviation of log10- 

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

109 03063950 Job Run near Wymer WV .817 .351 .466 .967 1.836 .318

110 03065000 Dry Fork at Hendricks WV .813 .322 .491 .959 4.136 .211

111 03065400 Blackwater River near Davis WV .689 .342 .347 .796 3.195 .204

112 03066000 Blackwater River at Davis WV .671 .337 .334 .721 3.416 .197113 03067100 Fernow WS-4 near Hendricks WV .666 .316 .350 .316 .846 .239114 03067500 Shavers Fork at Cheat Bridge WV .550 .345 .205 .304 3.615 .138115 03068610 Taylor Run at Bowden WV .759 .334 .425 .439 2.379 .203116 03068800 Shavers Fork below Bowden WV .682 .323 .359 .355 4.043 .172117 03069000 Shavers Fork at Parsons WV .710 .311 .399 .846 3.957 .162118 03069500 Cheat River near Parsons WV .795 .307 .488 .845 4.422 .187119 03069850 Long Run near Parsons WV .519 .280 .239 .548 1.906 .185

120 03069880 Buffalo Creek near Rowlesburg WV .501 .279 .222 .210 3.032 .206121 03070000 Cheat River at Rowlesburg WV .747 .276 .471 .596 4.541 .189122 03070500 Big Sandy Creek near Rockville WV .476 .230 .246 .750 3.875 .176123 03071000 Cheat River near Pisgah WV .617 .219 .398 .280 4.644 .200124 03071500 Cheat River near Morgantown WV .611 .196 .415 -.010 4.665 .190125 03072000 Dunkard Creek at Shannopin PA .114 .164 -.050 -.110 3.850 .199126 03072590 Georges Creek at Smithfield PA .394 .188 .206 .290 2.826 .197127 03075450 Little Youghiogheny R. Trib. at Deer Park MD .555 .316 .239 .099 1.370 .205128 03075500 Youghiogheny River near Oakland MD .562 .303 .259 .385 3.636 .210129 03075600 Toliver Run Tributary near Hoyes Run MD .548 .294 .254 .579 1.501 .284130 03076505 Youghiogheny R. Trib. near Friendsville MD .541 .269 .272 .215 1.072 .143131 03076600 Bear Creek at Friendsville MD .560 .276 .284 .057 3.192 .205132 03085500 Chartiers Creek at Carnegie PA .108 .057 .051 .136 3.737 .223133 03108000 Raccoon Creek at Moffatts Mill PA .055 .004 .051 .356 3.568 .220134 03109000 Lisbon Creek at Lisbon OH .094 -.055 .149 .284 2.592 .237135 03109500 Little Beaver Creek near East Liverpool OH .098 -.022 .120 .160 3.958 .202
30 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number Streamgage-station name State WV skew, unitless U.S. skew, unitless Difference between WV and US skews, unitless Weighted WV and station skews, unitless Mean of log10- transformed flood-frequency discharges, in cubic feet per second Standard deviation of log10- transformed flood-frequency discharges, in cubic feet per second 136 03110000 Yellow Creek near Hammondsville OH .015 -.025 .040 .391 3.497 .196 137 03110980 Consol Run at Bloomingdale OH -.015 -.013 -.002 -.040 .808 .331 138 03111150 Brush Run near Buffalo PA .049 .048 .001 -.110 2.721 .294 139 03111450 Branson Run at Georgetown OH -.034 -.012 -.022 .048 1.764 .293 140 03111455 South Fork Short Creek at Georgetown OH -.035 -.012 -.023 .005 2.352 .242 141 03111470 Little Piney Fork at Parlett OH -.019 -.013 -.006 .108 1.805 .367 142 03111500 Short Creek near Dillonvale OH -.029 .011 -.040 -.130 3.448 .211 143 03111540 Sloan Run Tributary near Harrisville OH -.040 -.002 -.038 -.060 1.686 .520 144 03111548 Wheeling Creek below Blaine OH -.045 .016 -.061 .008 3.426 .239 145 03112000 Wheeling Creek at Elm Grove WV .005 .036 -.031 -.040 3.955 .205 146 03113700 Little Grave Creek near Glendale WV -.036 .042 -.078 -.070 2.693 .333 147 03114000 Captina Creek at Armstrongs Mills OH -.066 .023 -.089 .000 3.785 .216 148 03114240 Wood Run near Woodsfield OH -.081 .026 -.107 -.130 1.805 .377 149 03114500 Middle Island Creek at Little WV -.105 .079 -.184 .090 4.132 .132 150 03114550 Buffalo Run near Friendly WV -.109 .071 -.180 -.250 2.307 .306 151 03114600 Little Buffalo Run near Friendly WV -.109 .073 -.182 -.190 2.401 .258 152 03114650 Buffalo Run near Little WV -.110 .076 -.186 -.340 2.905 .286 153 03115280 Trail Run near Antioch OH -.099 .051 -.150 .218 2.814 .218

154 03115400 Little Muskingum River at Bloomfield OH -.091 .041 -.132 .481 3.890 .230155 03115410 Graham Run near Bloomfield OH -.099 .042 -.141 -.260 1.282 .383156 03115500 Little Muskingum River at Fay OH -.093 .042 -.135 -.010 3.886 .194157 03115510 Moss Run near Wingott OH -.095 .039 -.134 .196 2.359 .253158 03115600 Barns Run near Summerfield OH -.059 -.007 -.052 .045 2.737 .357159 03115710 Buffalo Run Tributary near Dexter City OH -.057 -.002 -.055 .252 1.646 .086160 03150600 Tupper Creek at Devola OH -.057 .020 -.077 .173 2.153 .239161 03151400 Little Kanawha River near Wildcat WV .181 .247 -.066 .450 3.708 .243162 03151500 Little Kanawha River near Burnsville WV .144 .227 -.083 -.170 3.712 .135
Table 1 31

Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number 

Streamgage 

station number Streamgage-station name State WV skew, unitless U.S. skew, unitless

Difference 

between 

WV and US 

skews, 

unitless

Weighted WV 

and station 

skews, 

unitless

Mean of log10-

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

Standard 

deviation of log10- 

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

163 03152000 Little Kanawha River at Glenville WV .014 .181 -.167 -.010 3.986 .149164 03152200 Buck Run near Leopold WV -.128 .171 -.299 .021 2.537 .247165 03152500 Leading Creek near Glenville WV -.130 .173 -.303 -.300 3.783 .194166 03153000 Steer Creek near Grantsville WV -.063 .166 -.229 -.260 3.838 .180167 03153500 Little Kanawha River at Grantsville WV -.075 .147 -.222 -.270 4.301 .119168 03154000 W. Fk. Little Kanawha River at Rocksdale WV -.097 .141 -.238 -.150 3.887 .175169 03154250 Tanner Run at Spencer WV -.118 .127 -.245 -.080 2.824 .204170 03154500 Reedy Creek near Reedy WV -.118 .098 -.216 .086 3.548 .146171 03155000 Little Kanawha River at Palestine WV -.112 .084 -.196 -.210 4.466 .141172 03155200 South Fork Hughes River at Macfarlan WV -.149 .111 -.260 -.290 3.911 .119173 03155450 Big Island Run near Elizabeth WV -.138 .099 -.237 -.240 2.865 .246174 03155500 Hughes River at Cisco WV -.146 .092 -.238 -.130 4.160 .164175 03155525 Goose Creek near Petroleum WV -.130 .086 -.216 .084 3.274 .231176 03159540 Shade River near Chester OH .051 .011 .040 .565 3.579 .182177 03159700 Grasslick Run near Ripley WV -.077 .086 -.163 .270 2.191 .239178 03171500 New River at Eggleston VA .370 .412 -.042 .674 4.543 .246179 03173000 Walker Creek at Bane VA .034 .404 -.370 .005 3.833 .221180 03175500 Wolf Creek near Narrows VA -.038 .385 -.423 -.420 3.722 .228181 03176400 Rich Creek near Peterstown WV -.044 .381 -.425 -.160 3.162 .147182 03176500 New River at Glen Lyn VA .307 .378 -.071 .584 4.608 .244183 03177500 Indian Creek at Indian Mills WV -.039 .366 -.405 -.290 3.593 .084184 03177700 Bluestone River at Bluefield VA -.090 .343 -.433 -.070 2.851 .146185 03178500 Camp Creek near Camp Creek WV -.153 .335 -.488 -.240 3.153 .267186 03179000 Bluestone River near Pipestem WV -.139 .344 -.483 -.460 3.901 .217187 03179500 Bluestone River at Lilly WV -.140 .345 -.485 -.170 3.944 .152188 03180000 New River at Bluestone Dam WV .205 .347 -.142 .567 4.693 .213189 03180350 W. Fk. Greenbrier River Trib. at Durbin WV .635 .357 .278 .553 1.741 .191
32 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number Streamgage-station name State WV skew, unitless U.S. skew, unitless Difference between WV and US skews, unitless Weighted WV and station skews, unitless Mean of log10- transformed flood-frequency discharges, in cubic feet per second Standard deviation of log10- transformed flood-frequency discharges, in cubic feet per second 190 03180500 Greenbrier River at Durbin WV .728 .359 .369 1.068 3.687 .210 191 03180530 Brush Run near Bartow WV .646 .370 .276 .380 1.862 .330 192 03180680 Cooper Run near Green Bank WV .488 .378 .110 .259 1.992 .266 193 03181900 Mack Butterball Hollow near Huntersville WV .231 .376 -.145 .043 1.019 .153 194 03182000 Knapp Creek at Marlinton WV .179 .367 -.188 .728 3.708 .163 195 03182500 Greenbrier River at Buckeye WV .439 .364 .075 .460 4.273 .181 196 03182700 Anthony Creek near Anthony WV .049 .381 -.332 .524 3.980 .165 197 03183000 Second Creek near Second Creek WV -.010 .388 -.398 .017 3.409 .232 198 03183500 Greenbrier River at Alderson WV .110 .364 -.254 -.140 4.527 .169 199 03183550 Griffith Creek near Alderson WV -.029 .356 -.385 -.270 2.441 .130 200 03183570 Buggar Lick at Pence Springs WV -.041 .361 -.402 .119 2.118 .296 201 03184000 Greenbrier River at Hilldale WV .090 .356 -.266 .127 4.568 .148 202 03184200 Big Creek near Bellepoint WV -.058 .352 -.410 .077 2.782 .361 203 03184500 New River at Hinton WV .013 .344 -.331 .206 4.898 .212 204 03185000 Piney Creek at Raleigh WV -.147 .305 -.452 .070 3.091 .235 205 03185020 Little Beaver Cr. Trib. near Shady Springs WV -.121 .316 -.437 -.310 1.472 .328 206 03185500 New River at Caperton WV -.015 .293 -.308 -.090 4.957 .189 207 03186000 New River at Fayette WV -.016 .281 -.297 -.160 4.975 .210

208 03186500 Williams River at Dyer WV .289 .301 -.012 .379 3.914 .188209 03187000 Gauley River at Camden on Gauley WV .295 .289 .006 .254 4.057 .191210 03187300 North Fk. Cranberry River near Hillsboro WV .244 .334 -.090 .343 2.911 .233

211 03187500 Cranberry River near Richwood WV .238 .307 -.069 .311 3.695 .189

212 03189000 Cherry River at Fenwick WV .175 .310 -.135 .656 3.944 .204213 03189100 Gauley River near Craigsville WV .243 .295 -.052 .113 4.415 .195214 03189500 Gauley River near Summersville WV .234 .279 -.045 .514 4.397 .172215 03189650 Collison Creek near Nallen WV .090 .287 -.197 -.110 2.234 .231216 03190000 Meadow River at Nallen WV .050 .296 -.246 .036 3.779 .149
Table 1 33

Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number 

Streamgage 

station number Streamgage-station name State WV skew, unitless U.S. skew, unitless

Difference 

between 

WV and US 

skews, 

unitless

Weighted WV 

and station 

skews, 

unitless

Mean of log10-

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

Standard 

deviation of log10- 

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

217 03190100 Anglins Creek near Nallen WV .093 .296 -.203 .215 3.231 .372218 03190400 Meadow River near Mount Lookout WV .056 .277 -.221 .276 3.958 .187219 03190500 Meadow Creek near Summersville WV .078 .273 -.195 -.170 2.506 .155220 03191400 Laurel Creek near Summersville WV .064 .262 -.198 .085 2.379 .348221 03191500 Peters Creek near Lockwood WV .078 .258 -.180 .112 3.420 .279222 03192000 Gauley River above Belva WV .164 .242 -.078 .319 4.624 .158223 03192500 Gauley River at Belva WV .159 .242 -.083 .251 4.576 .198224 03193000 Kanawha River at Kanawha Falls WV -.060 .253 -.313 -.070 5.089 .178225 03193725 Little Fork at Mossy WV -.080 .269 -.349 .104 1.267 .203226 03193830 Gilmer Run near Marlinton WV .304 .351 -.047 .621 2.393 .273227 03194700 Elk River below Webster Springs WV .382 .270 .112 .500 4.082 .179228 03195000 Elk River at Centralia WV .376 .260 .116 .143 4.049 .101229 03195100 Right Fork Holly River at Guardian WV .274 .268 .006 .478 3.395 .187230 03195250 Left Fork Holly River near Replete WV .276 .265 .011 .388 3.403 .187231 03195500 Elk River at Sutton WV .307 .235 .072 .287 4.299 .159232 03195600 Granny Creek at Sutton WV .062 .233 -.171 .199 2.961 .159233 03197000 Elk River at Queen Shoals WV .176 .191 -.015 .418 4.446 .154234 03197150 Ashleycamp Run near Left Hand WV -.080 .174 -.254 .029 2.347 .175235 03197900 Elk Twomile Creek Trib. near Charleston WV -.077 .179 -.256 .060 1.840 .251236 03198350 Clear Fork at Whitesville WV -.119 .241 -.360 .096 3.332 .391237 03198450 Drawdy Creek near Peytona WV -.110 .196 -.306 .263 2.571 .275238 03198500 Big Coal River at Ashford WV -.129 .184 -.313 .088 4.021 .232239 03198780 Hunters Branch near Madison WV -.133 .201 -.334 -.120 2.081 .256240 03198800 Low Gap Creek near Madison WV -.126 .195 -.321 -.230 1.864 .436241 03199000 Little Coal River at Danville WV -.159 .186 -.345 -.070 3.965 .273242 03199300 Rock Creek near Danville WV -.113 .183 -.296 -.260 2.622 .305243 03199400 Little Coal River at Julian WV -.150 .171 -.321 .105 4.006 .241
34 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number Streamgage-station name State WV skew, unitless U.S. skew, unitless Difference between WV and US skews, unitless Weighted WV and station skews, unitless Mean of log10- transformed flood-frequency discharges, in cubic feet per second Standard deviation of log10- transformed flood-frequency discharges, in cubic feet per second 244 03200500 Coal River at Tornado WV -.133 .140 -.273 -.290 4.300 .174 245 03200600 Little Scary Creek near Nitro WV -.058 .118 -.176 .049 1.926 .228 246 03201000 Pocatalico River at Sissonville WV -.099 .135 -.234 -.140 3.826 .189 247 03201405 Hurricane Creek at Hurricane WV -.035 .099 -.134 -.180 3.317 .183 248 03201410 Poplar Fork at Teays WV -.045 .108 -.153 -.040 2.955 .179 249 03201420 Long Branch near Teays WV -.040 .103 -.143 -.300 2.406 .155 250 03201440 Sixteenmile Creek near Pliny WV .007 .058 -.051 .302 2.490 .229 251 03201480 Threemile Creek Trib. near Point Pleasant WV .047 .019 .028 -.220 2.111 .323 252 03202000 Raccoon Creek at Adamsville OH .200 -.017 .217 .308 3.790 .191 253 03202245 Marsh Fork at Maben WV -.202 .290 -.492 .171 2.667 .239 254 03202400 Guyandotte River near Baileysville WV -.201 .265 -.466 -.030 3.911 .343 255 03202480 Brier Creek at Fanrock WV -.225 .268 -.493 -.310 2.541 .365 256 03202750 Clear Fork at Clear Fork WV -.216 .255 -.471 .042 3.638 .200 257 03203000 Guyandotte River at Man WV -.227 .223 -.450 -.340 4.294 .217 258 03203600 Guyandotte River at Logan WV -.228 .200 -.428 -.400 4.380 .252 259 03204000 Guyandotte River at Branchland WV -.215 .107 -.322 -.480 4.345 .201 260 03204500 Mud River near Milton WV -.052 .093 -.145 .250 3.808 .229 261 03205995 Sandusky Creek near Burlington OH .163 .030 .133 .335 2.066 .217

262 03206450 Fourpole Creek near Huntington WV .091 .055 .036 -.100 2.826 .337263 03206600 East Fork Twelvepole Creek near Dunlow WV -.050 .124 -.174 -.160 3.244 .195264 03206800 E. Fk. Twelvepole Creek near East Lynn WV -.017 .088 -.105 .199 3.536 .183265 03207000 Twelvepole Creek at Wayne WV .005 .068 -.063 .000 3.811 .228266 03207020 Twelvepole Creek below Wayne WV .008 .066 -.058 -.020 3.810 .224267 03207400 Prater Creek at Vasant VA -.106 .251 -.357 -.190 2.922 .448268 03207500 Levisa Fork near Grundy VA -.131 .238 -.369 -.390 3.955 .277269 03207800 Levisa Fork at Big Rock VA -.133 .221 -.354 .000 3.946 .323270 03207962 Dicks Fork at Phyllis KY -.069 .187 -.256 -.180 1.796 .369
Table 1 35

Table 1. Identification numbers, station numbers, streamgage-station names, and skew coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; N., North; S., South; E., East; W., West; R., Right; Br., Branch; Fk., Fork; Cr., Creek; Trib., Tributary; Spgs., Springs; Rt., Route; bl, below; nr, near; U.S. skew, United States skew, the skew presented in Bulletin-17B by the Interagency Advisory Committee on Water Data (1982); WV skew, West Virginia skew determined by Atkins and others (2009); shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number 

Streamgage 

station number Streamgage-station name State WV skew, unitless U.S. skew, unitless

Difference 

between 

WV and US 

skews, 

unitless

Weighted WV 

and station 

skews, 

unitless

Mean of log10-

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

Standard 

deviation of log10- 

transformed 

flood-frequency 

discharges, 

in cubic feet per 

second

271 03208000 Levisa Fork below Fishtrap Dam KY -.131 .178 -.309 -.130 4.076 .216272 03208500 Russel Fork at Haysi VA -.058 .223 -.281 -.240 4.099 .295273 03208950 Cranes Nest River near Clintwood VA .034 .213 -.179 .189 3.402 .305274 03209000 Pond R. blw. Flannagan Dam near Haysi VA .027 .213 -.186 -.100 3.970 .236275 03209575 Bill D. Branch near Kite KY .132 .131 .001 .430 2.464 .203276 03210000 Johns Crek near Meta KY -.064 .153 -.217 -.420 3.396 .247277 03211500 Johns Creek near Van Lear KY .003 .085 -.082 -.110 3.627 .227278 03212000 Paint Creek at Staffordsville KY .298 .047 .251 -.170 3.706 .303279 03212750 Tug Fork at Welch WV -.183 .287 -.470 -.060 3.490 .336280 03212980 Dry Fork at Beartown WV -.154 .269 -.423 -.310 3.718 .252281 03213000 Tug Fork at Litwar WV -.183 .255 -.438 -.250 4.081 .261282 03213500 Panther Creek near Panther WV -.177 .256 -.433 -.150 3.205 .385283 03213700 Tug Fork at Williamson WV -.191 .169 -.360 .043 4.242 .268284 03214000 Tug Fork near Kermit WV -.186 .133 -.319 -.050 4.380 .281285 03214500 Tug Fork at Kermit WV -.180 .127 -.307 -.130 4.366 .268286 03214900 Tug Fork at Glenhayes WV -.165 .087 -.252 -.040 4.275 .241287 03215500 Blaine Creek at Yatesville KY .268 .039 .229 .116 3.784 .219288 03216500 Little Sandy River at Grayson KY .370 -.024 .394 .270 4.007 .178289 03216540 E. Fk. Little Sandy River near Fallsburg KY .258 .024 .234 .249 2.975 .168290 03216563 Mile Branch near Rush KY .286 -.006 .292 .088 2.280 .185
36 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Drainage area, in square miles Water years bounding systematic peaks Number of years of record Override of outlier thresholds Number of peaks Trend analysis Systematic Historic High threshold discharge, in cubic feet per second Low threshold discharge, in cubic feet per second High outlier Low outlier Kendall’s tau Significance level

1 01595000 MD 73.1 1955–2006 52 -- -- -- -- -- -0.130 0.1752 01595300 WV 42.6 1955–1982 27 83 -- -- 1 -- -.239 .0833 01595500 MD 225 1950–2006 56 -- -- -- 1 -- .071 .4454 01596000 MD 287 1924–1950 25 -- -- -- -- -- -.093 .5285 01596500 MD 49.1 1949–2006 58 -- -- -- 1 -- -.056 .5376 01597000 MD 16.7 1949–1981 33 -- -- -- 1 -- -.030 .8167 01598000 MD 115 1925–1950 24 -- -- -- -- -- -.007 .9808 01599000 MD 72.4 1931–2007 77 -- -- -- -- -- -.081 .3019 01599500 WV 46.5 1948–1969 21 -- -- -- -- -- -.100 .546

10 01600000 MD 598 1936–1950 15 -- -- -- -- -- -.495 .012

11 01601500 MD 247 1930–2006 77 -- -- -- 2 -- .107 .169

12 01603000 MD 877 1930–1981 52 -- -- -- 1 -- -.088 .36013 01604500 WV 221 1939–2007 69 -- -- -- -- -- -.231 .00514 01605500 WV 179 1936–2007 61 130 -- -- -- -- .104 .23715 01605700 WV 0.23 1965–1977 13 -- -- -- -- -- .462 .03316 01606000 WV 310 1940–2007 50 130 -- -- 1 -- .065 .50917 01606500 WV 651 1924–2007 80 130 -- -- 3 -- .075 .32518 01606800 WV 1.56 1965–1977 13 -- -- -- -- -- .308 .16119 01607500 WV 103 1944–2007 64 130 -- -- 2 -- -.187 .03020 01607510 WV 1.04 1999–2007 9 -- -- -- -- -- -.143 .71121 01608000 WV 277 1924–2007 78 130 -- -- 1 -- -.092 .23522 01608100 WV 0.21 1965–1977 13 -- -- -- -- -- .513 .01723 01608500 WV 1,461 1900–2007 84 130 -- -- 3 -- .046 .53624 01609000 MD 148 1928–2005 26 -- -- -- -- -- -.052 .72425 01609500 MD 5.08 1948–1976 25 -- -- -- -- 1 .033 .83326 01609650 WV 28.9 1999–2007 9 -- -- -- -- -- .000 1.00027 01609800 WV 108 1967–1977 11 -- -- -- -- -- .309 .21328 01610000 WV 3,114 1939–2006 68 -- -- -- 1 -- -- --29 01610150 MD 10.4 1965–1983 18 -- -- -- -- -- .046 .820
Table 2 37

Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification

number

Streamgage 

station 

number

State

Drainage area, 

in square 

miles

Water years 

bounding 

systematic 

peaks

Number of years of 

record Override of outlier thresholds Number of peaks Trend analysis

Systematic Historic

High threshold 

discharge, in 

cubic feet per 

second

Low threshold 

discharge, in 

cubic feet per 

second

High 

outlier

Low 

outlier

Kendall’s 

tau

Significance 

level

30 01610155 MD 102 1968–2006 18 -- -- -- -- -- -.033 .88031 01610500 WV 306 1936–1951 14 67 36,000 -- 1 -- -.143 .51132 01611500 WV 675 1923–2007 84 119 -- -- 1 -- -.018 .80833 01612500 MD 16.9 1948–1964 17 -- -- -- -- -- -.015 .96734 01613000 MD 4,075 1929–2006 75 -- -- -- 1 -- -- --35 01613150 MD 4.80 1965–1986 22 -- -- -- -- -- -.013 .95536 01613160 MD 1.20 1965–1976 12 -- -- -- 1 -- .089 .78837 01613900 VA 15.9 1961–2006 46 -- -- -- -- 1 .048 .64338 01614000 WV 235 1929–2007 51 -- -- -- -- 1 .036 .71539 01615000 VA 58.2 1944–2006 58 -- -- -- -- -- .194 .03240 01616000 VA 17.0 1950–1994 27 -- -- -- -- -- .396 .00441 01616500 WV 273 1948–2007 60 -- -- -- -- -- .170 .05642 01617000 WV 11.3 1949–2007 26 -- -- -- -- 1 -- --43 01617800 MD 18.9 1964–2007 43 -- -- -- -- -- -- --44 01618000 MD 5,950 1929–2004 69 -- -- -- -- 1 -- --45 01619475 MD 0.10 1966–1976 11 -- -- -- -- -- -- --46 01619500 MD 281 1928–2007 80 -- -- -- -- 1 -- --47 01620500 VA 17.3 1947–2006 60 -- -- -- -- -- -- --48 01621000 VA 73.0 1943–1986 31 55 -- -- 1 -- -.077 .55249 01621200 VA 9.73 1949–1976 28 -- -- -- -- -- .063 .66150 01621400 VA 5.44 1949–1961 13 40 -- -- 1 -- -.282 .20051 01621450 VA 0.67 1966–1975 10 25 -- -- 1 -- .156 .59252 01622000 VA 375 1927–2006 77 146 -- -- 5 -- -.080 .30553 01622100 VA 1.56 1966–1975 10 -- -- -- -- -- .511 .04954 01622300 VA 0.54 1967–1976 10 -- -- -- -- -- -- --55 01622400 VA 0.46 1967–2000 32 -- -- -- -- -- -- --56 01632000 VA 210 1926–2006 81 172 -- -- 12 -- .085 .26257 01632300 VA 7.94 1950–1977 25 -- -- -- 1 -- .051 .74758 01632900 VA 93.6 1961–2006 45 -- -- -- -- -- .043 .681
38 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Drainage area, in square miles Water years bounding systematic peaks Number of years of record Override of outlier thresholds Number of peaks Trend analysis Systematic Historic High threshold discharge, in cubic feet per second Low threshold discharge, in cubic feet per second High outlier Low outlier Kendall’s tau Significance level 59 01632950 VA 0.34 1966–1975 10 -- -- -- -- -- .533 .039 60 01632970 VA 6.60 1972–2006 35 -- -- -- -- -- -.166 .173 61 01633000 VA 508 1944–2006 62 172 -- -- 1 -- .124 .157 62 01633500 VA 77.5 1947–1976 30 69 -- -- -- -- .074 .586 63 01633650 VA 3.43 1971–2006 36 -- -- -- 1 -- -.178 .130 64 01634000 VA 770 1926–2006 80 138 -- -- 1 -- .053 .488 65 01634500 VA 102 1938–2006 69 -- -- -- -- 1 .211 .010 66 01636500 WV 3,041 1896–2007 90 138 -- -- 4 -- -- -- 67 01637000 MD 8.83 1948–1976 29 -- -- -- -- -- -- -- 68 01637500 MD 66.9 1948–2006 59 -- -- -- -- -- -- -- 69 01638480 VA 89.6 1971–2006 36 -- -- -- -- -- -- -- 70 01638500 MD 9,651 1895–2007 113 -- -- -- -- -- -- -- 71 01643700 VA 122 1966–2006 34 -- -- -- -- -- -.016 .906 72 01644000 VA 332 1910–2006 79 119 -- -- 2 -- .096 .213 73 01644100 VA 2.06 1966–1977 12 -- -- -- -- -- -- -- 74 02009500 VA 0.68 1966–1975 10 -- -- -- -- 1 -- -- 75 02011400 VA 157 1972–2006 34 91 -- -- 1 -- -- -- 76 02011460 VA 60.9 1975–2006 32 91 -- -- 1 -- -- -- 77 02011480 VA 88.6 1974–1984 11 -- -- -- -- -- -.345 .161 78 02011500 VA 134 1951–1984 34 -- -- -- -- -- .105 .389

79 02012500 VA 410 1925–1979 55 75 -- -- -- 1 .238 .01080 02012950 VA 0.86 1966–1995 26 -- -- -- -- -- -.217 .25981 02013000 VA 162 1929–2006 78 -- -- -- -- -- .104 .18082 02014000 VA 153 1929–2006 68 -- -- -- -- 1 .114 .17283 03050000 WV 185 1916–2007 80 -- -- -- -- -- .166 .03084 03050500 WV 271 1945–2004 60 120 -- -- 1 -- .112 .20985 03050650 WV 0.46 1964–2006 22 -- -- -- 1 1 -.104 .51686 03051000 WV 406 1908–2007 100 120 -- -- 2 -- .044 .51687 03051500 WV 122 1916–1942 27 120 -- -- -- -- .157 .260
Table 2 39

Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification

number

Streamgage 

station 

number

State

Drainage area, 

in square 

miles

Water years 

bounding 

systematic 

peaks

Number of years of 

record Override of outlier thresholds Number of peaks Trend analysis

Systematic Historic

High threshold 

discharge, in 

cubic feet per 

second

Low threshold 

discharge, in 

cubic feet per 

second

High 

outlier

Low 

outlier

Kendall’s 

tau

Significance 

level

88 03052000 WV 148 1943–2007 56 120 -- -- -- -- .153 .09789 03052340 WV 2.33 1966–2007 19 -- -- -- -- -- -.135 .44190 03052500 WV 14.3 1947–2007 61 -- -- -- -- -- .121 .16991 03053500 WV 277 1908–2007 93 -- -- -- -- -- .000 .99792 03054500 WV 914 1941–2007 67 120 60,000 -- 1 -- .151 .07293 03055020 WV 0.60 1966–1977 12 -- -- -- -- -- -.091 .73094 03055040 WV 3.15 1964–1977 14 -- -- -- -- -- -.121 .58495 03056250 WV 96.8 1985–2007 23 -- -- -- -- -- .032 .85396 03056500 WV 1,304 1908–1938 31 -- -- -- -- -- -.026 .85297 03056600 WV 2.33 1965–1977 13 -- -- -- -- -- .077 .76098 03057300 WV 28.8 1985–1999 15 -- -- -- -- -- .143 .48899 03057500 WV 25.7 1946–1985 40 -- -- -- -- -- -.072 .521

100 03058000 WV 101 1947–1989 43 102 -- -- 1 -- -.128 .229101 03058500 WV 181 1916–1989 74 -- -- -- -- -- -.123 .124102 03059000 WV 384 1924–1983 60 102 -- -- -- -- -.016 .858103 03059500 WV 84.6 1944–1970 27 -- -- -- -- -- -.077 .588104 03060500 WV 8.32 1952–1969 18 -- -- -- -- -- .013 .970105 03061000 WV 759 1908–1989 65 -- -- -- -- -- -.002 .986106 03061500 WV 116 1916–2007 83 -- -- -- -- -- -.013 .863107 03062400 WV 11.0 1966–2002 37 42 -- -- 1 -- -.188 .105108 03062500 WV 63.2 1947–2007 36 -- -- -- -- -- -.159 .178109 03063950 WV 1.08 1965–1977 12 -- -- -- 1 -- .030 .945

110 03065000 WV 349 1941–2007 67 120 -- -- 1 -- .132 .117

111 03065400 WV 54.7 1992–2007 12 -- -- -- -- -- -.121 .631

112 03066000 WV 85.9 1922–2007 86 -- -- -- 1 -- .111 .133113 03067100 WV 0.15 1952–2006 55 -- -- -- -- -- -.070 .455114 03067500 WV 57.6 1922–2007 21 -- -- -- -- 1 .329 .040115 03068610 WV 5.06 1974–1998 16 -- -- -- -- -- .117 .558116 03068800 WV 151 1974–2007 18 -- -- -- -- -- .137 .449
40 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Drainage area, in square miles Water years bounding systematic peaks Number of years of record Override of outlier thresholds Number of peaks Trend analysis Systematic Historic High threshold discharge, in cubic feet per second Low threshold discharge, in cubic feet per second High outlier Low outlier Kendall’s tau Significance level 117 03069000 WV 213 1911–2001 74 -- -- -- 1 -- .052 .513 118 03069500 WV 722 1914–2007 94 164 -- -- 4 -- .160 .023 119 03069850 WV 0.95 1966–1977 12 -- -- -- 1 -- -.030 .945 120 03069880 WV 12.2 1968–2007 24 -- -- -- -- -- -.355 .016 121 03070000 WV 939 1921–1996 74 164 -- -- 2 -- .180 .024 122 03070500 WV 200 1910–2007 93 -- -- -- 1 -- -.041 .564 123 03071000 WV 1,354 1903–1958 47 142 -- -- -- -- -.004 .978 124 03071500 WV 1,380 1903–1926 16 142 -- -- -- -- -- -- 125 03072000 PA 229 1941–2006 66 -- -- -- -- -- .007 .943 126 03072590 PA 16.3 1964–1978 15 -- -- -- -- -- .067 .767 127 03075450 MD 0.57 1965–1976 12 -- -- -- -- -- -- -- 128 03075500 MD 134 1936–2006 65 -- -- -- -- -- -- -- 129 03075600 MD 0.53 1965–1986 22 -- -- -- 1 -- -- -- 130 03076505 MD 0.22 1965–1976 12 -- -- -- -- -- -- -- 131 03076600 MD 48.9 1965–2007 43 -- -- -- -- -- -- -- 132 03085500 PA 257 1916–2006 84 -- -- -- 1 -- .078 .295 133 03108000 PA 178 1916–2006 80 -- -- -- 1 -- -.155 .042 134 03109000 OH 6.19 1947–1981 35 -- -- -- -- -- -.032 .798 135 03109500 OH 496 1916–2006 91 -- -- -- -- -- -.141 .049 136 03110000 OH 147 1941–2006 66 -- -- -- -- -- -.189 .025

137 03110980 OH 0.04 1978–1987 10 -- -- -- -- -- -- --138 03111150 PA 10.3 1961–1985 21 -- -- -- -- -- -- --139 03111450 OH 1.31 1978–1990 11 -- -- -- -- -- -.200 .474140 03111455 OH 10.9 1978–1990 11 -- -- -- -- -- -- --141 03111470 OH 1.57 1978–1987 10 -- -- -- -- -- -- --142 03111500 OH 123 1942–2006 65 -- -- -- -- 1 -- --143 03111540 OH 0.34 1978–1987 10 -- -- -- -- -- -- --144 03111548 OH 97.7 1983–2006 23 -- -- -- -- -- .146 .342145 03112000 WV 281 1941–1974 34 -- -- -- -- -- -.037 .767
Table 2 41

Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification

number

Streamgage 

station 

number

State

Drainage area, 

in square 

miles

Water years 

bounding 

systematic 

peaks

Number of years of 

record Override of outlier thresholds Number of peaks Trend analysis

Systematic Historic

High threshold 

discharge, in 

cubic feet per 

second

Low threshold 

discharge, in 

cubic feet per 

second

High 

outlier

Low 

outlier

Kendall’s 

tau

Significance 

level

146 03113700 WV 4.95 1970–1996 12 -- -- -- -- -- -.182 .451147 03114000 OH 134 1927–2002 53 -- -- -- -- -- .009 .933148 03114240 OH 0.53 1978–1987 10 -- -- -- -- -- -.333 .210149 03114500 WV 458 1916–1997 78 -- -- -- -- -- .095 .219150 03114550 WV 0.88 1966–1977 12 -- -- -- -- -- .212 .373151 03114600 WV 1.22 1967–1977 11 -- -- -- -- -- -.018 1.000152 03114650 WV 4.19 1969–2007 23 -- -- -- -- 1 .079 .616153 03115280 OH 5.45 1978–1987 10 -- -- -- 1 -- -.022 1.000154 03115400 OH 210 1959–2006 34 95 -- -- 1 -- .066 .594155 03115410 OH 0.13 1978–1987 10 -- -- -- -- -- -.071 .902156 03115500 OH 258 1916–1935 20 -- -- -- -- -- .026 .897157 03115510 OH 1.52 1978–1987 10 -- -- -- 1 -- .444 .118158 03115600 OH 3.46 1947–1979 33 -- -- -- -- -- -- --159 03115710 OH 0.19 1978–1987 10 -- -- -- 1 -- -- --160 03150600 OH 0.99 1966–1980 15 -- -- -- -- -- -.238 .235161 03151400 WV 112 1975–2007 31 -- -- -- -- -- .024 .865162 03151500 WV 155 1939–1973 35 -- -- -- -- -- .045 .712163 03152000 WV 387 1929–1979 51 -- -- -- -- -- -.045 .649164 03152200 WV 2.91 1970–2006 21 -- -- -- -- -- .124 .450165 03152500 WV 144 1938–1951 14 -- -- -- -- -- .462 .025166 03153000 WV 166 1939–1975 37 -- -- -- -- 1 .087 .456167 03153500 WV 913 1929–1979 51 -- -- -- -- -- .067 .490168 03154000 WV 205 1929–2000 66 -- -- -- -- -- -.129 .127169 03154250 WV 2.82 1970–1998 13 -- -- -- -- -- .179 .428170 03154500 WV 79.4 1952–1978 27 51 -- -- 4 -- .217 .118171 03155000 WV 1,516 1939–1979 41 -- -- -- -- 1 .057 .605172 03155200 WV 210 1938–1951 14 -- -- -- -- -- .330 .112173 03155450 WV 3.52 1965–1998 17 -- -- -- -- -- .206 .266174 03155500 WV 453 1930–1997 59 -- -- -- -- -- -.049 .592
42 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Drainage area, in square miles Water years bounding systematic peaks Number of years of record Override of outlier thresholds Number of peaks Trend analysis Systematic Historic High threshold discharge, in cubic feet per second Low threshold discharge, in cubic feet per second High outlier Low outlier Kendall’s tau Significance level 175 03155525 WV 25.3 1998–2007 10 -- -- -- -- -- -.289 .283 176 03159540 OH 156 1966–2006 41 -- -- -- 1 1 -.029 .796 177 03159700 WV 0.70 1965–1977 13 -- -- -- 1 -- -.141 .541 178 03171500 VA 2,961 1915–1939 25 -- -- -- 1 -- -- -- 179 03173000 VA 299 1938–2006 69 -- -- -- -- -- -.044 .594 180 03175500 VA 223 1909–2006 77 -- -- -- -- -- -.027 .735 181 03176400 WV 50.6 1942–1951 10 -- -- -- -- -- .156 .589 182 03176500 VA 3,783 1915–1938 24 -- -- -- 1 -- -- -- 183 03177500 WV 189 1942–1951 10 -- -- -- -- 1 .178 .530 184 03177700 VA 39.7 1966–1980 15 -- -- -- -- 1 .333 .092 185 03178500 WV 32.0 1947–1998 29 56 5,000 -- 1 -- .005 .985 186 03179000 WV 395 1951–2007 57 -- -- -- -- 1 .070 .445 187 03179500 WV 438 1909–1948 27 -- -- -- -- -- .217 .118 188 03180000 WV 4,602 1924–1948 25 -- -- -- 1 -- -- -- 189 03180350 WV 1.13 1966–1977 12 -- -- -- -- -- .167 .492 190 03180500 WV 133 1944–2007 64 112 -- -- 2 -- .118 .171 191 03180530 WV 1.28 1966–1977 11 -- -- -- -- -- .236 .350 192 03180680 WV 1.52 1965–1977 13 -- -- -- -- -- .205 .360 193 03181900 WV 0.10 1965–1977 13 -- -- -- -- 1 -.167 .459 194 03182000 WV 108 1946–1998 19 90 21,000 -- 1 -- .135 .441

195 03182500 WV 540 1930–2007 78 112 -- -- 1 -- .138 .075196 03182700 WV 144 1972–1982 11 90 -- -- -- -- -.309 .213197 03183000 WV 80.8 1946–1998 30 -- -- -- -- -- .152 .246198 03183500 WV 1,364 1896–2007 112 -- -- -- -- -- -.031 .635199 03183550 WV 3.84 1966–1977 12 -- -- -- -- 1 .136 .582200 03183570 WV 2.31 1966–1977 12 -- -- -- -- -- .076 .783201 03184000 WV 1,619 1936–2007 72 -- -- -- -- -- .047 .563202 03184200 WV 8.27 1970–2007 17 -- -- -- -- 1 -.191 .303203 03184500 WV 6,256 1937–1948 12 -- -- -- 1 -- -- --
Table 2 43

Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification

number

Streamgage 

station 

number

State

Drainage area, 

in square 

miles

Water years 

bounding 

systematic 

peaks

Number of years of 

record Override of outlier thresholds Number of peaks Trend analysis

Systematic Historic

High threshold 

discharge, in 

cubic feet per 

second

Low threshold 

discharge, in 

cubic feet per 

second

High 

outlier

Low 

outlier

Kendall’s 

tau

Significance 

level

204 03185000 WV 52.7 1952–2007 36 -- -- -- -- -- .021 .870205 03185020 WV 0.62 1966–1977 12 -- -- -- -- -- .167 .492206 03185500 WV 6,826 1929–1948 20 -- -- -- -- -- -- --207 03186000 WV 6,850 1896–1948 35 63 -- -- -- -- -- --208 03186500 WV 128 1930–2007 78 -- -- -- -- -- .121 .117209 03187000 WV 236 1909–2000 77 106 42,000 -- 1 -- .056 .473210 03187300 WV 9.78 1969–1998 19 -- -- -- -- -- .275 .108

211 03187500 WV 80.4 1945–2007 49 -- -- -- -- -- .158 .111

212 03189000 WV 150 1930–1982 43 69 -- -- 1 -- .171 .109213 03189100 WV 529 1965–2007 41 76 -- -- 2 -- .039 .728214 03189500 WV 680 1909–1965 45 -- -- -- 1 -- .100 .338215 03189650 WV 2.78 1966–1977 12 -- -- -- -- -- .000 1.000216 03190000 WV 287 1909–1971 51 -- -- -- -- -- .073 .455217 03190100 WV 23.5 1999–2007 9 -- -- -- -- -- -.333 .251218 03190400 WV 365 1967–2007 39 -- -- -- -- -- -.101 .371219 03190500 WV 4.22 1966–1976 11 -- -- -- -- -- .291 .241220 03191400 WV 3.88 1966–1998 17 33 1,800 -- 1 -- .279 .127221 03191500 WV 40.2 1946–2007 37 -- -- -- -- -- -.009 .948222 03192000 WV 1,317 1929–1964 36 -- -- -- -- -- -.081 .496223 03192500 WV 1,402 1909–1930 14 -- -- -- 1 -- .341 .098224 03193000 WV 8,371 1878–1948 71 -- -- -- -- -- -- --225 03193725 WV 0.33 1966–1977 12 -- -- -- -- 1 .242 .301226 03193830 WV 1.80 1969–2007 18 -- -- -- 1 -- .490 .005227 03194700 WV 266 1930–2007 76 -- -- -- -- -- .173 .027228 03195000 WV 281 1935–1963 29 -- -- -- -- -- -- --229 03195100 WV 51.9 1975–1987 10 -- -- -- 1 -- .022 1.000230 03195250 WV 46.5 1975–2007 30 -- -- -- -- -- .149 .254231 03195500 WV 542 1939–1960 22 29 -- -- -- -- .056 .735232 03195600 WV 6.39 1966–2004 23 -- -- -- -- 1 .146 .342
44 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Drainage area, in square miles Water years bounding systematic peaks Number of years of record Override of outlier thresholds Number of peaks Trend analysis Systematic Historic High threshold discharge, in cubic feet per second Low threshold discharge, in cubic feet per second High outlier Low outlier Kendall’s tau Significance level 233 03197000 WV 1,145 1929–1960 32 -- -- -- 1 -- -.181 .149 234 03197150 WV 2.01 1966–2006 20 -- -- -- -- 1 .179 .284 235 03197900 WV 0.49 1964–1975 12 -- -- -- -- -- .030 .945 236 03198350 WV 62.8 1997–2007 10 -- -- -- -- -- .067 .858 237 03198450 WV 7.75 1965–1998 18 -- -- -- -- -- .176 .325 238 03198500 WV 391 1909–2007 85 -- -- -- -- -- .019 .796 239 03198780 WV 1.97 1966–1977 12 -- -- -- -- -- -.152 .537 240 03198800 WV 1.28 1963–1977 14 -- -- -- -- -- -.022 .956 241 03199000 WV 269 1931–1984 54 -- -- -- -- -- -.020 .835 242 03199300 WV 12.2 1979–2006 14 -- -- -- -- -- -.209 .324 243 03199400 WV 318 1975–1984 10 -- -- -- -- -- .067 .858 244 03200500 WV 862 1909–2007 52 -- -- -- -- -- -.085 .377 245 03200600 WV 0.87 1966–1977 12 -- -- -- -- 1 .258 .271 246 03201000 WV 238 1909–1999 54 -- -- -- -- -- -.029 .760 247 03201405 WV 26.8 1999–2007 9 -- -- -- -- -- -.111 .754 248 03201410 WV 8.47 1992–2007 16 -- -- -- -- 1 -.167 .392 249 03201420 WV 2.05 1965–1977 13 -- -- -- -- 1 -.346 .112 250 03201440 WV 1.04 1965–1977 13 -- -- -- -- -- -.026 .951 251 03201480 WV 0.70 1965–1977 13 -- -- -- -- -- -.436 .044 252 03202000 OH 585 1916–2006 83 -- -- -- -- -- -- --

253 03202245 WV 4.85 1978–2007 12 31 -- -- 1 -- -.389 .175254 03202400 WV 306 1969–2007 39 -- -- -- -- -- -.069 .545255 03202480 WV 7.34 1970–2007 22 -- -- -- -- -- -.143 .367256 03202750 WV 126 1975–2007 33 -- -- -- -- 1 -.061 .631257 03203000 WV 758 1929–1979 51 -- -- -- -- -- .064 .516258 03203600 WV 833 1961–1979 19 -- -- -- -- -- .094 .600259 03204000 WV 1,224 1916–1979 58 -- -- -- -- -- .065 .477260 03204500 WV 256 1938–1980 43 -- -- -- -- -- .078 .470261 03205995 OH 0.73 1978–2006 15 -- -- -- -- -- .114 .586
Table 2 45

Table 2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; - -, no value; shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification

number

Streamgage 

station 

number

State

Drainage area, 

in square 

miles

Water years 

bounding 

systematic 

peaks

Number of years of 

record Override of outlier thresholds Number of peaks Trend analysis

Systematic Historic

High threshold 

discharge, in 

cubic feet per 

second

Low threshold 

discharge, in 

cubic feet per 

second

High 

outlier

Low 

outlier

Kendall’s 

tau

Significance 

level

262 03206450 WV 4.02 1999–2007 9 -- -- -- -- -- -.179 .618263 03206600 WV 38.5 1965–2007 43 -- -- -- -- -- .066 .537264 03206800 WV 139 1962–1971 10 59 -- -- 1 -- -.156 .592265 03207000 WV 291 1916–1966 31 59 -- -- -- -- -- --266 03207020 WV 300 1916–1971 36 59 -- -- -- -- -.108 .361267 03207400 VA 20.0 1951–1977 27 -- -- -- -- 1 -.128 .359268 03207500 VA 239 1942–1995 43 -- -- -- -- -- -.142 .184269 03207800 VA 297 1968–2006 39 -- -- -- -- -- -.100 .377270 03207962 KY 0.82 1975–1984 9 -- -- -- -- -- .139 .675271 03208000 KY 392 1938–1968 31 -- -- -- -- -- .062 .634272 03208500 VA 286 1927–2006 80 -- -- -- -- -- -.051 .504273 03208950 VA 66.5 1964–2006 42 -- -- -- 1 -- -.026 .820274 03209000 VA 221 1927–1965 39 -- -- -- -- -- -.165 .143275 03209575 KY 3.17 1976–1986 11 -- -- -- 1 -- -.236 .350276 03210000 KY 56.3 1938–2006 66 -- -- -- -- -- -.079 .352277 03211500 KY 206 1938–1949 12 -- -- -- -- 1 -.030 .945278 03212000 KY 103 1950–1981 32 -- -- -- -- -- -.137 .277279 03212750 WV 174 1986–2007 22 -- -- -- -- -- .095 .554280 03212980 WV 209 1986–2007 22 -- -- -- -- 1 .212 .176281 03213000 WV 504 1931–1986 56 -- -- -- -- -- .062 .506282 03213500 WV 31.0 1947–2007 46 -- -- -- -- -- .133 .195283 03213700 WV 936 1968–2007 40 -- -- -- -- 1 -.033 .771284 03214000 WV 1,188 1935–1985 51 -- -- -- -- -- -- --285 03214500 WV 1,280 1916–2007 81 -- -- -- -- -- -.071 .350286 03214900 WV 1,507 1977–1995 12 -- -- -- -- -- -.182 .451287 03215500 KY 217 1916–1981 49 -- -- -- -- -- -.168 .089288 03216500 KY 400 1937–1967 30 -- -- -- -- 1 -.053 .695289 03216540 KY 12.2 1973–1991 19 -- -- -- -- 1 .175 .310290 03216563 KY 0.94 1976–1987 12 -- -- -- -- 1 .045 .891
46 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

1 01595000 MD East

Qs 1,700 2,600 3,280 5,390 7,130 9,760 12,100 14,700 17,700 22,300

Qr 993 1,620 2,120 3,840 5,390 7,780 9,820 12,100 14,600 18,200

Qw 1,640 2,530 3,170 5,080 6,590 8,890 10,900 13,200 15,800 19,800

2 01595300 WV East

Qs 818 1,050 1,240 1,870 2,430 3,350 4,220 5,280 6,550 8,670

Qr 638 1,030 1,360 2,440 3,420 4,920 6,200 7,610 9,150 11,400

Qw 799 1,050 1,250 1,990 2,750 4,080 5,290 6,650 8,180 10,500

3 01595500 MD East

Qs 4,440 6,160 7,580 12,400 16,800 24,100 31,200 39,900 50,600 68,600

Qr 2,490 4,100 5,410 9,850 13,900 20,200 25,600 31,600 38,200 48,200

Qw 4,280 6,010 7,390 11,900 15,900 22,500 28,400 35,200 43,200 55,800

4 01596000 MD East

Qs 4,050 6,270 8,020 13,600 18,500 26,100 33,100 41,200 50,700 65,800

Qr 3,040 5,020 6,620 12,100 17,000 24,800 31,500 38,900 47,100 59,500

Qw 3,900 6,100 7,790 13,100 17,800 25,300 32,000 39,500 48,000 60,900

5 01596500 MD East

Qs 847 1,200 1,480 2,350 3,100 4,260 5,300 6,530 7,960 10,200

Qr 717 1,160 1,520 2,750 3,850 5,550 7,000 8,590 10,300 12,900

Qw 839 1,200 1,480 2,410 3,270 4,710 6,010 7,500 9,160 11,700

6 01597000 MD East

Qs 250 376 481 840 1,180 1,740 2,290 2,970 3,810 5,230

Qr 297 477 622 1,110 1,550 2,230 2,790 3,420 4,090 5,090

Qw 254 384 494 898 1,300 1,970 2,570 3,240 3,990 5,140

7 01598000 MD East

Qs 1,790 2,690 3,420 5,860 8,050 11,600 15,000 19,000 23,900 32,000

Qr 1,440 2,350 3,090 5,610 7,890 11,400 14,400 17,800 21,500 27,000

Qw 1,740 2,640 3,370 5,780 7,970 11,500 14,600 18,100 22,100 28,100

8 01599000 MD East

Qs 1,010 1,490 1,860 3,000 3,960 5,440 6,750 8,270 10,000 12,700

Qr 985 1,600 2,110 3,810 5,340 7,720 9,740 12,000 14,400 18,100

Qw 1,010 1,490 1,870 3,090 4,220 6,080 7,790 9,730 11,900 15,200

9 01599500 WV East

Qs 425 760 1,020 1,850 2,520 3,530 4,400 5,360 6,430 8,020

Qr 686 1,110 1,460 2,630 3,680 5,300 6,680 8,200 9,870 12,300

Qw 455 801 1,080 2,080 3,030 4,560 5,880 7,340 8,920 11,200

10 01600000 MD East

Qs 7,960 12,200 15,600 26,600 36,100 51,200 65,000 81,300 100,000 131,000

Qr 5,620 9,330 12,300 22,600 32,000 46,800 59,600 73,800 89,700 114,000

Qw 7,410 11,600 14,800 24,700 33,600 48,000 60,700 75,200 91,400 116,000
Table 3 47

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

11 01601500 MD East Qs 3,310 4,820 6,070 10,400 14,400 21,100 27,600 35,600 45,600 62,400

Qr 2,690 4,430 5,840 10,600 15,000 21,800 27,700 34,200 41,400 52,300

Qw 3,280 4,800 6,060 10,400 14,500 21,300 27,600 35,000 43,500 57,000

12 01603000 MD East Qs 10,500 14,500 17,600 27,300 35,500 48,200 59,700 73,100 88,600 113,000

Qr 7,590 12,600 16,800 30,800 43,700 63,900 81,500 101,000 123,000 156,000

Qw 10,300 14,400 17,500 27,900 37,700 54,400 69,800 87,400 107,000 138,000

13 01604500 WV East Qs 1,520 2,730 3,670 6,560 8,910 12,300 15,300 18,400 22,000 27,100

Qr 2,460 4,040 5,330 9,700 13,700 19,900 25,200 31,100 37,600 47,500

Qw 1,560 2,780 3,750 6,940 9,840 14,600 18,900 23,700 28,900 36,600

14 01605500 WV East Qs 1,840 3,270 4,520 9,070 13,500 21,200 28,800 38,400 50,300 70,600

Qr 2,070 3,390 4,470 8,130 11,500 16,600 21,100 26,000 31,400 39,600

Qw 1,850 3,280 4,520 8,920 13,000 19,300 25,000 31,500 39,000 50,900

15 01605700 WV East Qs 11.2 16 19.8 31.9 42.3 58.7 73.6 91.1 112 145

Qr 8.9 13.7 17.6 30.7 42.1 58.9 72.7 87.5 103 125

Qw 10.8 15.6 19.4 31.5 42.2 58.8 73 88.5 105 130

16 01606000 WV East Qs 4,500 6,430 8,050 13,700 18,900 27,900 36,700 47,700 61,500 84,900

Qr 3,240 5,350 7,060 12,900 18,200 26,500 33,600 41,500 50,300 63,600

Qw 4,420 6,370 7,980 13,500 18,700 27,400 35,300 44,500 55,200 72,200

17 01606500 WV East Qs 6,660 10,200 13,100 23,200 32,900 49,300 65,300 85,300 110,000 153,000

Qr 5,950 9,880 13,100 24,000 34,000 49,600 63,200 78,400 95,200 121,000

Qw 6,630 10,200 13,100 23,300 33,100 49,400 64,500 82,200 103,000 136,000

18 01606800 WV East Qs 14.7 27.1 38.7 84.2 133 223 319 446 613 915

Qr 42.6 67 86.6 153 211 298 371 450 534 656

Qw 17.8 31.7 45.7 107 170 271 356 449 550 701

19 01607500 WV East Qs 1,510 2,440 3,280 6,550 10,000 16,500 23,500 32,800 45,200 68,200

Qr 1,310 2,150 2,820 5,120 7,190 10,400 13,200 16,200 19,500 24,500

Qw 1,500 2,430 3,250 6,340 9,320 14,200 18,600 23,800 30,000 40,400

20 01607510 WV East Qs a13.8 22.9 30.6 57.5 82.7 125 166 216 278 381

Qr 30.6 47.9 61.8 109 150 212 263 318 377 462

Qw 16.6 27 36.9 77.9 119 184 239 296 359 449
48 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 21 01608000 WV East

Qs 2,710 4,440 5,940 11,300 16,600 25,800 34,900 46,500 61,200 86,500

Qr 2,950 4,870 6,430 11,700 16,500 24,100 30,500 37,700 45,700 57,700

Qw 2,720 4,460 5,970 11,400 16,600 25,200 33,100 42,400 53,200 70,500

22 01608100 WV East

Qs 30.8 40.3 46.3 61.3 71.3 83.9 93.4 103 113 126

Qr 8.3 12.7 16.3 28.5 39 54.5 67.3 80.9 95.4 116

Qw 25.1 34 38.4 46.9 53.2 64.3 74.8 86.7 99.7 118

23 01608500 WV East

Qs 10,700 17,200 22,700 41,700 59,700 90,400 120,000 157,000 203,000 280,000

Qr 11,500 19,300 25,600 47,200 67,100 98,500 126,000 156,000 191,000 243,000

Qw 10,700 17,300 22,800 42,300 61,100 92,800 122,000 157,000 197,000 262,000

24 01609000 MD East

Qs 1,860 3,000 3,850 6,360 8,340 11,200 13,600 16,200 19,100 23,400

Qr 1,770 2,900 3,820 6,930 9,760 14,100 17,900 22,100 26,700 33,600

Qw 1,850 2,990 3,850 6,530 8,940 12,900 16,300 20,200 24,400 30,700

25 01609500 MD East

Qs 163 223 267 398 502 658 792 943 1,110 1,370

Qr 112 178 231 411 570 811 1,010 1,230 1,470 1,820

Qw 156 218 262 401 529 737 922 1,130 1,350 1,680

26 01609650 WV East

Qs

a381 a741 1,050 2,150 3,180 4,880 6,470 8,390 10,700 14,400

Qr 465 750 981 1,760 2,470 3,540 4,460 5,460 6,560 8,180

Qw 402 744 1,030 1,930 2,670 3,790 4,730 5,790 6,950 8,710

27 01609800 WV East

Qs 2,070 3,080 3,810 5,980 7,680 10,200 12,300 14,600 17,200 21,000

Qr 1,370 2,230 2,940 5,320 7,480 10,800 13,700 16,900 20,300 25,600

Qw 1,870 2,850 3,540 5,640 7,550 10,700 13,400 16,500 19,900 25,000

28 01610000 WV East

Qs 23,700 34,000 41,700 64,600 83,100 111,000 134,000 161,000 191,000 237,000

29 01610150 MD East

Qs 167 284 375 666 911 1,290 1,620 1,990 2,420 3,070

Qr 201 322 419 749 1,040 1,490 1,870 2,280 2,730 3,380

Qw 172 289 383 694 974 1,410 1,790 2,200 2,650 3,310

30 01610155 MD East

Qs 1,410 2,620 3,620 7,010 10,000 14,800 19,200 24,300 30,200 39,500

Qr 1,300 2,130 2,800 5,080 7,130 10,300 13,000 16,100 19,400 24,300

Qw 1,390 2,530 3,440 6,190 8,370 11,600 14,400 17,600 21,200 26,700
Table 3 49

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

31 01610500 WV East Qs 2,600 5,190 7,420 15,100 22,000 33,100 43,100 54,900 68,600 90,000

Qr 3,210 5,290 6,980 12,700 18,000 26,200 33,200 41,100 49,800 62,900

Qw 2,720 5,210 7,310 14,000 19,500 27,900 35,100 43,300 52,400 66,400

32 01611500 WV East Qs 5,110 9,490 13,000 24,100 33,400 47,300 59,300 72,700 87,600 110,000

Qr 6,120 10,200 13,500 24,700 35,000 51,200 65,200 80,800 98,200 125,000

Qw 5,150 9,520 13,000 24,200 33,700 48,500 61,500 76,000 92,300 117,000

33 01612500 MD East Qs 245 403 524 901 1,210 1,680 2,080 2,540 3,060 3,840

Qr 300 481 628 1,130 1,570 2,250 2,820 3,450 4,140 5,150

Qw 253 414 542 979 1,390 2,040 2,600 3,210 3,880 4,860

34 01613000 MD East Qs 28,400 42,300 53,100 86,800 115,000 159,000 199,000 244,000 297,000 379,00035 01613150 MD East Qs 126 190 237 377 489 653 793 949 1,120 1,380

Qr 107 170 221 392 544 773 966 1,180 1,400 1,730

Qw 124 188 235 381 512 720 901 1,100 1,320 1,630

36 01613160 MD East Qs a68.4 89.9 105 148 180 226 263 304 349 414

Qr 34.4 53.9 69.6 123 169 239 297 359 426 523

Qw 60.2 82 96.1 137 174 235 288 346 409 500

37 01613900 VA East Qs 298 604 856 1,660 2,320 3,310 4,130 5,040 6,040 7,480

Qr 285 458 597 1,070 1,490 2,130 2,680 3,270 3,920 4,880

Qw 297 593 832 1,530 2,050 2,750 3,340 3,990 4,710 5,790

38 01614000 WV East Qs 2,820 4,400 5,590 9,250 12,200 16,700 20,600 25,000 29,900 37,400

Qr 2,580 4,250 5,610 10,200 14,400 20,900 26,600 32,800 39,700 50,100

Qw 2,800 4,390 5,590 9,420 12,800 18,400 23,400 29,000 35,300 44,700

39 01615000 VA East Qs 973 1,780 2,420 4,480 6,220 8,860 11,200 13,800 16,700 21,100

Qr 824 1,340 1,760 3,170 4,450 6,410 8,090 9,930 12,000 15,000

Qw 964 1,750 2,370 4,240 5,710 7,830 9,640 11,700 13,900 17,400

40 01616000 VA East Qs 237 411 544 935 1,240 1,680 2,040 2,420 2,840 3,440

Qr 301 484 631 1,130 1,580 2,260 2,840 3,470 4,160 5,170

Qw 243 418 554 985 1,370 1,980 2,500 3,080 3,710 4,610
50 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 41 01616500 WV East

Qs 1,870 3,320 4,480 8,230 11,400 16,300 20,700 25,700 31,300 40,000

Qr 2,920 4,810 6,350 11,600 16,300 23,800 30,200 37,300 45,100 57,000

Qw 1,920 3,390 4,590 8,700 12,500 18,900 24,600 31,100 38,300 49,000

42 01617000 WV East

Qs 83.3 131 167 278 368 504 621 754 903 1,130

43 01617800 MD East

Qs 37.9 73.3 103 198 280 406 516 641 781 994

44 01618000 MD East

Qs 36,200 53,900 66,900 105,000 135,000 180,000 217,000 258,000 304,000 373,000

45 01619475 MD East

Qs 8.2 15.1 21.3 44.3 67.2 108 148 199 263 373

46 01619500 MD East

Qs 1,220 2,000 2,600 4,510 6,110 8,570 10,700 13,200 16,100 20,500

47 01620500 VA East

Qs 257 499 727 1,640 2,630 4,500 6,490 9,140 12,600 19,000

48 01621000 VA East

Qs 1,220 1,770 2,250 3,980 5,680 8,680 11,700 15,600 20,600 29,300

Qr 992 1,620 2,120 3,830 5,380 7,770 9,810 12,100 14,500 18,200

Qw 1,190 1,750 2,230 3,940 5,560 8,180 10,500 13,200 16,200 20,900

49 01621200 VA East

Qs 266 422 547 956 1,320 1,900 2,430 3,060 3,800 5,000

Qr 191 305 397 708 986 1,410 1,760 2,150 2,570 3,190

Qw 257 409 526 884 1,180 1,620 2,000 2,430 2,920 3,650

50 01621400 VA East

Qs 293 396 471 691 866 1,120 1,340 1,590 1,860 2,280

Qr 118 188 245 435 604 860 1,080 1,310 1,560 1,930

Qw 246 345 407 569 706 932 1,130 1,360 1,610 1,990

51 01621450 VA East

Qs 22.2 32.6 41.1 69.8 96 139 181 231 293 396

Qr 21.3 33.3 42.9 75.3 104 146 181 218 258 316

Qw 22 32.7 41.5 72.1 100 144 181 221 265 329

52 01622000 VA East

Qs 3,250 5,190 6,810 12,400 17,700 26,600 35,200 45,800 58,800 80,800

Qr 3,790 6,270 8,290 15,100 21,400 31,200 39,600 49,000 59,400 75,200

Qw 3,270 5,230 6,880 12,700 18,400 28,000 36,800 47,200 59,100 77,900

53 01622100 VA East

Qs 26.9 44.6 58.5 102 138 194 243 298 362 459

Qr 42.6 67 86.6 153 211 298 371 450 534 656

Qw 29.8 48.6 64.6 123 178 265 338 416 500 620

54 01622300 VA East

Qs 33.7 45.2 53.0 73.8 88.8 109 125 143 161 187

55 01622400 VA East

Qs a27.8 42.8 54.7 93.3 127 181 231 289 358 469
Table 3 51

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

56 01632000 VA East Qs 3,420 6,060 8,090 14,300 19,200 26,400 32,400 39,000 46,200 56,700

Qr 2,360 3,870 5,110 9,300 13,100 19,000 24,100 29,800 36,000 45,400

Qw 3,370 5,950 7,910 13,600 17,800 23,900 29,000 34,800 41,200 51,000

57 01632300 VA East Qs 43.3 87.4 129 294 470 796 1,140 1,580 2,160 3,180

Qr 161 258 335 598 831 1,180 1,480 1,810 2,160 2,680

Qw 50.2 98.2 146 359 594 992 1,340 1,730 2,160 2,810

58 01632900 VA East Qs 707 1,470 2,130 4,380 6,380 9,530 12,300 15,600 19,200 24,900

Qr 1,220 1,980 2,610 4,720 6,630 9,590 12,100 14,900 18,000 22,600

Qw 736 1,500 2,170 4,450 6,460 9,560 12,200 15,200 18,500 23,400

59 01632950 VA East Qs 13 18.8 22.8 33.7 41.6 52.4 61 70 79.6 93.1

Qr 12.2 19 24.4 42.6 58.5 82 101 122 144 176

Qw 12.8 18.8 23.2 37.2 50.4 71.4 89.1 108 128 156

60 01632970 VA East Qs 92.6 179 255 527 786 1,220 1,640 2,140 2,750 3,760

Qr 139 221 288 512 712 1,010 1,270 1,550 1,850 2,290

Qw 95.7 182 258 524 761 1,120 1,430 1,770 2,150 2,730

61 01633000 VA East Qs 4,620 8,120 10,800 19,100 25,800 35,600 43,900 53,000 63,000 77,700

Qr 4,850 8,050 10,600 19,500 27,600 40,200 51,200 63,400 77,000 97,500

Qw 4,630 8,120 10,800 19,200 26,200 37,200 46,900 57,800 69,900 87,900

62 01633500 VA East Qs a934 1,560 2,050 3,650 5,030 7,190 9,120 11,400 14,000 18,000

Qr 1,040 1,700 2,230 4,030 5,660 8,170 10,300 12,700 15,300 19,200

Qw 943 1,570 2,070 3,740 5,250 7,670 9,810 12,200 14,800 18,800

63 01633650 VA East Qs 39.1 77.3 111 233 350 547 736 966 1,240 1,700

Qr 81.2 129 167 296 410 582 726 882 1,050 1,300

Qw 41.3 80.2 115 245 367 562 731 917 1,120 1,440

64 01634000 VA East Qs 4,910 8,420 11,400 21,500 30,900 46,600 61,500 79,600 102,000 138,000

Qr 6,820 11,400 15,000 27,600 39,100 57,200 72,900 90,400 110,000 140,000

Qw 4,980 8,530 11,600 22,200 32,500 49,800 65,800 84,300 105,000 139,000

65 01634500 VA East Qs 1,250 2,340 3,250 6,400 9,250 13,900 18,100 23,200 29,100 38,600

Qr 1,300 2,130 2,800 5,080 7,130 10,300 13,000 16,100 19,400 24,300

Qw 1,250 2,330 3,220 6,190 8,720 12,500 15,800 19,500 23,700 30,200
52 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 66 01636500 WV East

Qs 14,000 24,500 32,800 59,200 81,400 115,000 145,000 178,000 216,000 274,000

67 01637000 MD East

Qs 184 375 553 1,260 1,990 3,320 4,690 6,450 8,710 12,700

68 01637500 MD East

Qs 1,020 1,830 2,480 4,580 6,370 9,130 11,600 14,300 17,500 22,300

69 01638480 VA East

Qs 1,300 2,690 3,870 7,780 11,100 16,300 20,800 25,800 31,400 39,800

70 01638500 MD East

Qs 54,000 81,800 102,000 161,000 207,000 272,000 327,000 387,000 453,000 549,000

71 01643700 VA East

Qs 1,340 2,710 3,890 8,030 11,800 18,000 23,600 30,300 38,100 50,500

Qr 1,510 2,470 3,250 5,900 8,290 12,000 15,200 18,700 22,600 28,400

Qw 1,360 2,690 3,810 7,430 10,300 14,600 18,200 22,200 26,800 33,800

72 01644000 VA East

Qs 2,920 5,260 7,260 14,300 20,900 31,900 42,300 55,100 70,600 96,000

Qr 3,430 5,660 7,470 13,600 19,300 28,100 35,600 44,000 53,400 67,500

Qw 2,940 5,280 7,270 14,200 20,500 30,600 39,600 50,000 61,900 80,700

73 01644100 VA East

Qs 176 295 387 680 925 1,300 1,630 2,000 2,420 3,070

74 02009500 VA Central

Qs

a24.4 29.1 32.0 39.3 44.2 50.4 55.0 59.7 64.5 71.0

75 02011400 VA Central

Qs 1,940 2,900 3,650 6,030 8,080 11,300 14,200 17,600 21,600 28,000

76 02011460 VA Central

Qs 1,560 2,280 2,820 4,490 5,860 7,950 9,780 11,900 14,300 18,000

77 02011480 VA Central

Qs 2,620 3,660 4,360 6,170 7,430 9,080 10,400 11,700 13,000 14,900

Qr 2,010 2,880 3,480 5,150 6,370 8,030 9,340 10,700 12,200 14,200

Qw 2,510 3,540 4,220 5,950 7,150 8,770 10,000 11,400 12,700 14,600

78 02011500 VA Central

Qs 3,240 4,860 5,940 8,700 10,600 12,900 14,700 16,500 18,300 20,700

Qr 2,940 4,150 5,000 7,310 8,990 11,300 13,000 14,900 16,900 19,600

Qw 3,220 4,820 5,890 8,580 10,400 12,700 14,500 16,300 18,100 20,500

79 02012500 VA Central

Qs 4,960 8,140 10,300 16,000 19,900 24,800 28,500 32,100 35,700 40,500

Qr 8,160 11,200 13,300 18,800 22,800 28,000 32,200 36,500 41,000 47,300

Qw 5,030 8,210 10,400 16,100 20,000 25,000 28,700 32,400 36,100 41,000

80 02012950 VA Central

Qs

a6.06 a20.6 37.7 118 211 386 566 795 1,080 1,560

Qr 29.1 47.1 60.8 102 135 182 221 263 308 373

Qw 7.3 22.4 39.7 116 194 329 457 611 794 1,090

81 02013000 VA Central

Qs 2,520 4,100 5,270 8,660 11,300 15,000 18,000 21,300 24,800 30,000

Qr 3,490 4,910 5,900 8,580 10,500 13,100 15,200 17,400 19,600 22,800

Qw 2,540 4,120 5,280 8,660 11,200 14,900 17,800 21,000 24,500 29,400
Table 3 53

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

82 02014000 VA Central Qs 1,920 3,130 3,980 6,290 7,940 10,100 11,800 13,500 15,300 17,800

Qr 3,310 4,670 5,610 8,180 10,000 12,500 14,500 16,600 18,800 21,800

Qw 1,950 3,160 4,020 6,350 8,030 10,200 12,000 13,700 15,500 18,000

83 03050000 WV Central Qs 4,270 5,760 6,790 9,560 11,600 14,300 16,600 18,900 21,400 25,000

Qr 3,940 5,530 6,630 9,600 11,700 14,600 16,900 19,300 21,800 25,300

Qw 4,260 5,760 6,790 9,560 11,600 14,400 16,600 18,900 21,400 25,000

84 03050500 WV Central Qs 5,090 6,410 7,300 9,670 11,400 13,700 15,500 17,400 19,400 22,300

Qr 5,590 7,760 9,250 13,300 16,100 20,000 23,000 26,200 29,500 34,100

Qw 5,100 6,440 7,350 9,800 11,600 14,000 15,900 17,900 20,000 23,000

85 03050650 WV Central Qs 23.3 35.6 46.2 83.6 120 183 245 325 425 598

Qr 16.4 27 35.2 60.3 80.4 109 133 160 188 228

Qw 22.2 34.4 44.6 78.8 110 161 208 266 336 450

86 03051000 WV Central Qs 6,970 8,930 10,200 13,500 15,800 18,700 21,000 23,300 25,800 29,100

Qr 8,080 11,100 13,200 18,700 22,600 27,800 31,900 36,200 40,700 46,900

Qw 6,990 8,960 10,200 13,600 15,900 19,000 21,300 23,800 26,300 29,700

87 03051500 WV Central Qs 2,800 4,000 4,850 7,230 9,010 11,500 13,600 15,800 18,100 21,600

Qr 2,690 3,820 4,610 6,750 8,310 10,400 12,100 13,800 15,700 18,200

Qw 2,790 3,990 4,840 7,200 8,950 11,400 13,400 15,500 17,800 21,200

88 03052000 WV Central Qs 3,690 5,100 6,060 8,630 10,500 13,000 15,000 17,000 19,200 22,300

Qr 3,210 4,540 5,450 7,950 9,760 12,200 14,100 16,100 18,300 21,200

Qw 3,670 5,080 6,040 8,600 10,400 12,900 14,900 17,000 19,200 22,200

89 03052340 WV Central Qs 90.4 128 155 227 279 351 409 471 536 630

Qr 72.3 114 145 238 310 412 495 584 679 816

Qw 87.5 126 154 229 286 366 431 500 574 680

90 03052500 WV Central Qs 412 631 797 1,300 1,720 2,340 2,880 3,500 4,190 5,260

Qr 380 570 708 1,100 1,400 1,810 2,140 2,490 2,860 3,390

Qw 411 629 794 1,290 1,690 2,290 2,810 3,390 4,040 5,030

91 03053500 WV Central Qs 4,850 6,500 7,490 9,770 11,200 12,800 13,900 15,000 16,100 17,400

Qr 5,700 7,910 9,430 13,500 16,400 20,400 23,400 26,700 30,000 34,700

Qw 4,870 6,520 7,520 9,850 11,300 13,000 14,300 15,400 16,600 18,000
54 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 92 03054500 WV Central

Qs 14,600 19,300 22,300 30,200 35,700 43,000 48,500 54,300 60,300 68,600

Qr 17,000 22,800 26,700 37,100 44,300 54,000 61,500 69,300 77,400 88,700

Qw 14,700 19,400 22,400 30,400 36,000 43,400 49,100 55,000 61,100 69,600

93 03055020 WV Central

Qs 31.1 51.5 66.8 112 147 197 238 284 333 404

Qr 20.9 34.2 44.4 75.5 100 136 165 197 232 281

Qw 28.4 47.4 61.3 99.9 129 171 206 244 286 346

94 03055040 WV Central

Qs 99.4 160 208 359 489 691 871 1,080 1,320 1,700

Qr 95.2 149 189 307 398 527 631 743 863 1,030

Qw 98.6 158 205 347 463 635 784 951 1,140 1,420

95 03056250 WV Central

Qs 2,910 3,990 4,720 6,720 8,170 10,100 11,700 13,400 15,200 17,700

Qr 2,180 3,110 3,760 5,550 6,860 8,630 10,000 11,500 13,000 15,200

Qw 2,840 3,920 4,640 6,580 7,980 9,890 11,400 13,000 14,800 17,200

96 03056500 WV Central

Qs 20,200 26,600 30,900 42,200 50,200 61,000 69,500 78,500 87,900 101,000

Qr 23,500 31,300 36,500 50,000 59,500 72,100 81,900 92,000 103,000 117,000

Qw 20,300 26,800 31,100 42,600 50,900 62,000 70,700 79,800 89,400 103,000

97 03056600 WV Central

Qs 104 161 202 318 405 526 624 730 842 1,000

Qr 72 114 145 238 310 412 495 584 679 816

Qw 97 152 190 296 375 485 576 673 777 927

98 03057300 WV West

Qs 864 1,280 1,570 2,340 2,890 3,630 4,220 4,830 5,470 6,370

Qr 739 1,180 1,500 2,400 3,060 3,950 4,640 5,360 6,110 7,140

Qw 837 1,260 1,560 2,350 2,940 3,740 4,380 5,040 5,730 6,700

99 03057500 WV West

Qs 867 1,130 1,290 1,650 1,870 2,130 2,310 2,490 2,650 2,870

Qr 678 1,080 1,380 2,210 2,830 3,650 4,300 4,970 5,660 6,620

Qw 848 1,130 1,300 1,700 1,980 2,340 2,600 2,870 3,140 3,480

100 03058000 WV West

Qs 1,950 2,690 3,190 4,480 5,370 6,540 7,450 8,380 9,340 10,700

Qr 1,930 2,990 3,750 5,850 7,360 9,360 10,900 12,500 14,100 16,400

Qw 1,950 2,710 3,220 4,580 5,560 6,890 7,930 9,000 10,100 11,600

101 03058500 WV West

Qs 3,520 5,060 6,070 8,620 10,300 12,500 14,100 15,800 17,400 19,600

Qr 3,010 4,610 5,750 8,850 11,100 14,000 16,200 18,500 20,900 24,100

Qw 3,500 5,050 6,060 8,630 10,400 12,600 14,300 16,000 17,800 20,100
Table 3 55

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

102 03059000 WV West Qs 6,320 8,630 10,000 13,100 15,000 17,100 18,600 20,000 21,300 23,000

Qr 5,340 8,060 9,950 15,100 18,700 23,500 27,100 30,700 34,500 39,500

Qw 6,270 8,610 10,000 13,200 15,200 17,600 19,300 21,000 22,600 24,600

103 03059500 WV West Qs 1,230 2,040 2,640 4,400 5,750 7,650 9,220 10,900 12,700 15,300

Qr 1,680 2,620 3,300 5,160 6,500 8,290 9,670 11,100 12,500 14,500

Qw 1,280 2,090 2,690 4,490 5,870 7,790 9,320 10,900 12,700 15,100

104 03060500 WV West Qs 329 611 827 1,460 1,930 2,590 3,110 3,660 4,240 5,040

Qr 287 470 606 994 1,280 1,680 1,990 2,320 2,660 3,140

Qw 320 587 789 1,340 1,730 2,240 2,640 3,060 3,510 4,130

105 03061000 WV West Qs 10,300 14,800 17,700 24,800 29,500 35,400 39,700 43,900 48,200 53,800

Qr 8,980 13,300 16,400 24,500 30,100 37,500 43,000 48,600 54,300 62,000

Qw 10,200 14,800 17,700 24,800 29,600 35,500 40,000 44,400 48,800 54,700

106 03061500 WV West Qs 3,340 4,490 5,200 6,910 8,000 9,340 10,300 11,300 12,200 13,500

Qr 2,140 3,320 4,150 6,450 8,100 10,300 12,000 13,700 15,500 17,900

Qw 3,280 4,450 5,170 6,890 8,010 9,410 10,500 11,500 12,500 13,900

107 03062400 WV West Qs 236 366 473 829 1,150 1,680 2,180 2,790 3,520 4,720

Qr 355 578 743 1,210 1,560 2,040 2,410 2,800 3,210 3,780

Qw 246 379 490 866 1,210 1,750 2,230 2,790 3,440 4,460

108 03062500 WV West Qs 757 1,180 1,510 2,540 3,390 4,700 5,860 7,180 8,700 11,000

Qr 1,350 2,110 2,660 4,190 5,300 6,780 7,930 9,110 10,300 12,000

Qw 798 1,230 1,570 2,670 3,610 5,010 6,220 7,550 9,040 11,300

109 03063950 WV Central Qs 29.9 46.1 61 120 183 303 435 615 861 1,320

Qr 35.8 57.6 74.2 124 164 220 266 316 369 446

Qw 31.1 48.1 63.5 121 176 270 360 472 609 841

110 03065000 WV Central Qs 7,890 10,500 12,700 19,800 26,200 36,700 46,600 58,600 73,100 97,200

Qr 7,040 9,710 11,500 16,400 19,900 24,600 28,300 32,100 36,100 41,600

Qw 7,870 10,500 12,700 19,700 25,900 35,900 45,300 56,500 69,900 91,900

111 03065400 WV Central Qs 906 1,220 1,470 2,260 2,930 3,980 4,940 6,060 7,390 9,500

Qr 1,290 1,880 2,290 3,430 4,270 5,410 6,330 7,280 8,300 9,720

Qw 959 1,290 1,570 2,460 3,210 4,340 5,320 6,420 7,670 9,570
56 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 112 03066000 WV Central

Qs 1,530 2,060 2,470 3,730 4,780 6,380 7,800 9,450 11,300 14,300

Qr 1,950 2,800 3,390 5,020 6,210 7,830 9,110 10,500 11,900 13,900

Qw 1,540 2,070 2,490 3,770 4,830 6,440 7,870 9,500 11,400 14,300

113 03067100 WV Central

Qs 3.5 5.4 6.8 11 14.4 19.5 23.8 28.7 34.1 42.3

Qr 5.89 10 13.2 23.4 31.7 43.8 54 65.1 77.2 94.7

Qw 3.63 5.6 7.08 11.8 15.7 21.6 26.7 32.3 38.6 47.9

114 03067500 WV Central

Qs 2,770 3,550 4,060 5,360 6,260 7,440 8,350 9,280 10,300 11,600

Qr 1,360 1,960 2,390 3,580 4,450 5,650 6,600 7,590 8,640 10,100

Qw 2,580 3,380 3,880 5,090 5,940 7,080 7,970 8,910 9,890 11,300

115 03068610 WV Central

Qs 135 191 231 350 443 578 693 821 963 1,180

Qr 147 227 286 458 590 775 925 1,090 1,260 1,500

Qw 137 195 238 369 474 626 754 893 1,050 1,270

116 03068800 WV Central

Qs 6,770 9,140 10,800 15,300 18,500 23,100 26,700 30,600 34,800 40,800

Qr 3,270 4,620 5,550 8,090 9,920 12,400 14,400 16,400 18,600 21,600

Qw 6,290 8,620 10,200 14,000 16,800 20,500 23,600 26,800 30,300 35,400

117 03069000 WV Central

Qs 5,880 7,430 8,600 12,100 14,900 19,100 22,800 26,900 31,600 38,800

Qr 4,480 6,260 7,500 10,800 13,200 16,400 19,000 21,600 24,400 28,300

Qw 5,840 7,400 8,570 12,000 14,800 19,000 22,500 26,600 31,100 38,000

118 03069500 WV Central

Qs 16,100 21,000 24,900 36,800 46,900 62,500 76,400 92,700 112,000 141,000

Qr 13,700 18,500 21,800 30,400 36,400 44,500 50,800 57,400 64,200 73,700

Qw 16,100 21,000 24,900 36,700 46,600 61,800 75,400 91,000 109,000 138,000

119 03069850 WV Central

Qs 48.1 65.1 77.4 113 142 183 218 256 300 365

Qr 31.8 51.4 66.3 111 147 198 240 285 333 403

Qw 43.8 62.2 75 113 143 188 226 267 313 380

120 03069880 WV Central

Qs 593 865 1,060 1,590 1,990 2,550 3,000 3,480 4,000 4,750

Qr 328 495 617 964 1,230 1,590 1,880 2,190 2,520 2,990

Qw 559 825 1,010 1,490 1,850 2,330 2,730 3,160 3,620 4,290

121 03070000 WV Central

Qs 20,600 27,900 33,300 49,300 62,000 80,800 97,000 115,000 136,000 167,000

Qr 17,400 23,400 27,400 37,900 45,300 55,200 62,800 70,800 79,000 90,600

Qw 20,500 27,800 33,200 48,900 61,400 79,700 95,300 113,000 132,000 162,000
Table 3 57

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

122 03070500 WV Central Qs 4,670 6,080 7,140 10,300 12,900 16,700 20,000 23,800 28,100 34,700

Qr 4,230 5,920 7,090 10,300 12,500 15,600 18,000 20,500 23,200 26,900

Qw 4,660 6,080 7,140 10,300 12,900 16,700 19,900 23,600 27,800 34,300

123 03071000 WV Central Qs 24,800 35,500 43,100 64,300 80,300 103,000 121,000 141,000 162,000 194,000

Qr 24,300 32,300 37,700 51,700 61,400 74,400 84,400 94,800 106,000 121,000

Qw 24,800 35,400 43,000 63,800 79,300 101,000 119,000 137,000 158,000 187,000

124 03071500 WV Central Qs 26,400 38,300 46,300 66,900 81,000 99,400 113,000 128,000 142,000 162,000125 03072000 PA West Qs 3,920 5,860 7,150 10,400 12,700 15,500 17,700 19,800 22,000 24,900

Qr 3,600 5,490 6,820 10,500 13,000 16,400 19,000 21,700 24,400 28,100

Qw 3,900 5,850 7,140 10,400 12,700 15,600 17,800 20,000 22,300 25,300

126 03072590 PA West Qs 381 542 656 974 1,210 1,550 1,820 2,120 2,440 2,900

Qr 479 774 990 1,600 2,060 2,670 3,150 3,650 4,180 4,900

Qw 400 575 703 1,100 1,420 1,890 2,270 2,670 3,090 3,680

127 03075450 MD Central Qs 12.9 19.0 23.2 34.8 43.1 54.4 63.3 72.7 82.6 96.5128 03075500 MD Central Qs 2,390 3,430 4,200 6,420 8,170 10,700 12,900 15,200 17,900 21,800129 03075600 MD Central Qs 14.4 22.9 29.8 53.6 75.5 112 147 190 243 330130 03076505 MD Central Qs a7.79 10.1 11.7 15.5 18.1 21.5 24.1 26.8 29.5 33.2131 03076600 MD Central Qs 851 1,260 1,550 2,310 2,860 3,590 4,160 4,760 5,390 6,260132 03085500 PA West Qs 2,850 4,340 5,400 8,380 10,600 13,700 16,300 19,000 21,900 26,100

Qr 3,930 5,980 7,420 11,300 14,100 17,800 20,600 23,400 26,400 30,300

Qw 2,880 4,380 5,450 8,490 10,800 14,000 16,600 19,300 22,300 26,500

133 03108000 PA West Qs 1,980 2,910 3,590 5,590 7,180 9,490 11,500 13,600 16,100 19,700

Qr 2,970 4,560 5,680 8,740 10,900 13,800 16,000 18,300 20,600 23,800

Qw 2,010 2,950 3,640 5,710 7,360 9,780 11,800 14,000 16,500 20,100

134 03109000 OH West Qs 198 303 381 613 798 1,070 1,300 1,560 1,840 2,270

Qr 229 378 488 806 1,040 1,370 1,630 1,900 2,190 2,580

Qw 201 309 389 635 835 1,130 1,370 1,640 1,930 2,360

135 03109500 OH West Qs 5,050 7,350 8,960 13,300 16,600 20,900 24,500 28,200 32,100 37,700

Qr 6,490 9,740 12,000 18,100 22,400 28,000 32,200 36,500 40,900 46,800

Qw 5,090 7,400 9,020 13,500 16,800 21,300 25,000 28,800 32,800 38,500
58 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 136 03110000 OH West

Qs 1,800 2,530 3,050 4,540 5,680 7,320 8,690 10,200 11,800 14,300

Qr 2,570 3,950 4,940 7,630 9,560 12,100 14,100 16,100 18,100 21,000

Qw 1,830 2,570 3,100 4,670 5,910 7,690 9,160 10,800 12,500 15,000

137 03110980 OH West

Qs 2.4 4.6 6.5 12.2 17.0 24.1 30.2 37.0 44.4 55.4

138 03111150 PA West

Qs 219 396 532 932 1,240 1,680 2,030 2,410 2,810 3,380

139 03111450 OH West

Qs 24.5 43.2 57.7 102 138 191 236 286 341 422

Qr 69.9 119 157 268 353 471 567 668 775 926

Qw 34 55.8 74.5 142 204 296 372 454 540 663

140 03111455 OH West

Qs

a110 a177 225 360 460 597 707 824 947 1,120

141 03111470 OH West

Qs 21.8 43.8 62.8 129 190 289 380 487 612 811

142 03111500 OH West

Qs 1,490 2,290 2,840 4,240 5,200 6,430 7,370 8,310 9,270 10,600

143 03111540 OH West

Qs 10.4 29.3 49.1 134 223 385 545 744 988 1,390

144 03111548 OH West

Qs 1,320 2,110 2,670 4,240 5,400 7,000 8,270 9,620 11,000 13,000

Qr 1,880 2,920 3,660 5,710 7,190 9,150 10,700 12,200 13,800 16,000

Qw 1,380 2,180 2,760 4,430 5,700 7,460 8,860 10,300 11,800 13,900

145 03112000 WV West

Qs 4,900 7,360 9,030 13,400 16,500 20,500 23,600 26,700 29,900 34,400

Qr 4,210 6,390 7,920 12,100 15,000 18,900 21,900 24,900 28,000 32,200

Qw 4,840 7,290 8,950 13,300 16,300 20,200 23,200 26,300 29,500 33,900

146 03113700 WV West

Qs 183 357 497 942 1,310 1,850 2,310 2,810 3,370 4,180

Qr 193 320 415 688 893 1,180 1,400 1,640 1,880 2,230

Qw 186 349 478 856 1,140 1,520 1,820 2,150 2,490 2,990

147 03114000 OH West

Qs 3,220 4,920 6,090 9,250 11,500 14,500 16,900 19,300 21,900 25,400

Qr 2,390 3,690 4,610 7,150 8,960 11,400 13,200 15,100 17,100 19,700

Qw 3,160 4,860 6,010 9,090 11,300 14,100 16,300 18,700 21,100 24,400

148 03114240 OH West

Qs 20.7 44.6 65 133 191 280 356 441 535 674

Qr 35 61.1 81.1 141 187 253 306 363 423 509

Qw 24.9 48.8 69.3 136 190 265 327 394 465 568

149 03114500 WV West

Qs 9,210 11,800 13,500 17,500 20,000 23,300 25,600 28,000 30,400 33,500

Qr 6,110 9,180 11,300 17,100 21,200 26,500 30,500 34,600 38,800 44,400

Qw 9,070 11,700 13,400 17,400 20,100 23,500 26,000 28,500 31,100 34,500
Table 3 59

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

150 03114550 WV West Qs 80.9 154 209 369 489 653 781 914 1,050 1,240

Qr 51.6 88.9 117 202 267 358 432 511 594 712

Qw 70.7 135 182 303 384 493 579 672 770 909

151 03114600 WV West Qs 116 198 257 417 532 684 801 922 1,040 1,210

Qr 66 113 149 254 335 449 540 637 739 883

Qw 97 172 224 352 439 557 652 753 860 1,010

152 03114650 WV West Qs 338 624 834 1,410 1,820 2,350 2,750 3,150 3,550 4,080

Qr 170 283 367 611 795 1,050 1,250 1,460 1,690 2,000

Qw 301 564 750 1,210 1,490 1,850 2,130 2,410 2,710 3,120

153 03115280 OH West Qs 347 517 639 986 1,250 1,620 1,930 2,260 2,620 3,150

Qr 208 344 445 736 955 1,260 1,500 1,750 2,010 2,380

Qw 296 467 583 893 1,120 1,430 1,690 1,960 2,260 2,680

154 03115400 OH West Qs 4,070 5,980 7,440 11,900 15,600 21,300 26,300 32,000 38,500 48,600

Qr 3,370 5,150 6,410 9,830 12,300 15,500 17,900 20,500 23,000 26,500

Qw 4,000 5,920 7,370 11,700 15,100 20,200 24,400 29,200 34,500 42,400

155 03115410 OH West Qs a6.06 13.5 19.9 40.6 57.7 82.7 103 126 150 184

Qr 12 21.5 29.1 51.9 70.1 96.2 118 141 166 201

Qw 7.81 15.6 22.4 44.8 63.3 89.8 111 135 159 195

156 03115500 OH West Qs 4,340 6,350 7,690 11,200 13,600 16,700 19,100 21,600 24,100 27,500

Qr 3,940 6,000 7,440 11,400 14,200 17,800 20,600 23,500 26,400 30,400

Qw 4,280 6,310 7,660 11,200 13,700 17,000 19,500 22,100 24,800 28,400

157 03115510 OH West Qs a110 175 224 371 488 659 804 965 1,140 1,410

Qr 78 133 175 297 391 522 627 738 856 1,020

Qw 98 163 210 342 443 586 703 829 966 1,160

158 03115600 OH West Qs 191 381 542 1,090 1,570 2,330 3,020 3,800 4,700 6,090159 03115710 OH West Qs a34.5 40.4 43.9 52.2 57.4 63.7 68.3 72.8 77.3 83.3160 03150600 OH West Qs 71 111 140 225 291 385 463 549 642 779

Qr 56.5 97 128 219 290 389 469 553 643 769

Qw 67 108 137 223 290 386 466 551 642 774
60 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 161 03151400 WV West

Qs 2,580 3,890 4,900 8,040 10,700 14,700 18,300 22,400 27,200 34,600

Qr 2,080 3,230 4,050 6,290 7,910 10,100 11,700 13,400 15,100 17,500

Qw 2,530 3,840 4,830 7,820 10,200 13,700 16,700 19,900 23,600 29,100

162 03151500 WV West

Qs 3,440 4,540 5,190 6,700 7,620 8,710 9,480 10,200 10,900 11,800

Qr 2,670 4,110 5,130 7,920 9,930 12,600 14,600 16,700 18,800 21,700

Qw 3,370 4,510 5,190 6,820 7,890 9,260 10,300 11,300 12,300 13,600

163 03152000 WV West

Qs 6,230 8,350 9,690 12,900 15,000 17,600 19,500 21,400 23,300 25,800

Qr 5,370 8,100 10,000 15,200 18,800 23,600 27,200 30,900 34,600 39,700

Qw 6,180 8,340 9,700 13,100 15,300 18,200 20,400 22,500 24,700 27,600

164 03152200 WV West

Qs 166 269 344 556 715 937 1,120 1,310 1,510 1,800

Qr 129 216 281 472 616 816 976 1,140 1,320 1,570

Qw 158 261 334 538 688 897 1,060 1,240 1,430 1,700

165 03152500 WV West

Qs 3,380 5,100 6,200 8,880 10,600 12,700 14,100 15,600 17,000 18,700

Qr 2,530 3,890 4,860 7,520 9,430 11,900 13,900 15,900 17,900 20,700

Qw 3,200 4,900 5,980 8,570 10,300 12,400 14,000 15,700 17,300 19,500

166 03153000 WV West

Qs 4,010 5,850 7,010 9,790 11,500 13,700 15,200 16,600 18,000 19,800

Qr 2,810 4,330 5,390 8,320 10,400 13,200 15,300 17,500 19,700 22,700

Qw 3,900 5,740 6,900 9,640 11,400 13,600 15,200 16,800 18,400 20,400

167 03153500 WV West

Qs 14,000 18,000 20,200 25,300 28,200 31,500 33,800 35,900 37,800 40,300

Qr 10,300 15,300 18,700 27,900 34,300 42,600 48,800 55,100 61,500 70,100

Qw 13,800 17,900 20,100 25,400 28,600 32,500 35,200 37,900 40,400 43,600

168 03154000 WV West

Qs 4,580 6,540 7,790 10,800 12,800 15,300 17,000 18,800 20,500 22,800

Qr 3,310 5,060 6,290 9,660 12,100 15,200 17,700 20,100 22,700 26,100

Qw 4,510 6,480 7,730 10,800 12,800 15,300 17,100 18,900 20,800 23,200

169 03154250 WV West

Qs 363 547 671 992 1,210 1,500 1,710 1,930 2,160 2,460

Qr 126 211 275 461 603 799 955 1,120 1,290 1,540

Qw 273 447 554 791 941 1,140 1,310 1,480 1,660 1,920

170 03154500 WV West

Qs 2,310 3,050 3,520 4,680 5,450 6,420 7,150 7,880 8,620 9,620

Qr 1,600 2,500 3,150 4,930 6,220 7,930 9,260 10,600 12,000 14,000

Qw 2,230 3,010 3,490 4,710 5,550 6,670 7,530 8,400 9,300 10,500
Table 3 61

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

171 03155000 WV West Qs 19,200 25,700 29,600 38,500 43,900 50,300 54,800 59,000 63,100 68,300

Qr 15,200 22,300 27,100 40,000 48,900 60,300 68,900 77,500 86,200 98,000

Qw 18,900 25,500 29,500 38,600 44,400 51,400 56,500 61,400 66,300 72,500

172 03155200 WV West Qs 5,700 7,330 8,260 10,300 11,500 12,800 13,700 14,500 15,300 16,200

Qr 3,370 5,150 6,410 9,830 12,300 15,500 17,900 20,500 23,000 26,500

Qw 5,170 6,960 7,960 10,200 11,700 13,600 15,100 16,500 18,000 19,900

173 03155450 WV West Qs 350 585 748 1,180 1,490 1,880 2,170 2,470 2,770 3,170

Qr 149 249 323 540 704 930 1,110 1,300 1,500 1,780

Qw 291 507 649 981 1,190 1,460 1,670 1,890 2,120 2,450

174 03155500 WV West Qs 8,870 12,400 14,600 19,900 23,300 27,500 30,600 33,600 36,500 40,400

Qr 6,060 9,110 11,200 17,000 21,000 26,300 30,300 34,300 38,500 44,100

Qw 8,710 12,300 14,500 19,700 23,100 27,400 30,500 33,600 36,800 40,900

175 03155525 WV West Qs 955 1,480 1,860 2,930 3,730 4,830 5,730 6,680 7,700 9,150

Qr 670 1,070 1,370 2,190 2,790 3,610 4,250 4,910 5,600 6,550

Qw 864 1,380 1,730 2,680 3,340 4,240 4,950 5,710 6,500 7,630

176 03159540 OH West Qs 2,290 3,080 3,650 5,310 6,610 8,510 10,100 11,900 13,900 16,900

Qr 2,680 4,130 5,160 7,960 9,970 12,600 14,700 16,700 18,900 21,800

Qw 2,320 3,130 3,720 5,500 6,930 9,020 10,800 12,700 14,700 17,800

177 03159700 WV West Qs 78 120 151 245 319 427 520 623 737 908

Qr 43.3 75 99.4 172 227 306 370 438 510 612

Qw 65.9 108 137 219 280 367 440 520 606 733

178 03171500 VA Central Qs 17,800 26,100 32,800 54,700 74,200 106,000 135,000 171,000 214,000 284,000179 03173000 VA Central Qs 3,540 5,460 6,800 10,400 13,100 16,600 19,400 22,300 25,300 29,600

Qr 6,110 8,460 10,100 14,400 17,500 21,700 24,900 28,300 31,900 36,900

Qw 3,590 5,510 6,860 10,600 13,200 16,800 19,700 22,600 25,700 30,000

180 03175500 VA Central Qs 2,640 4,340 5,470 8,260 10,100 12,200 13,700 15,200 16,600 18,400

Qr 4,680 6,520 7,800 11,200 13,700 17,100 19,700 22,400 25,300 29,300

Qw 2,680 4,380 5,510 8,350 10,200 12,400 14,000 15,500 17,000 18,900
62 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 181 03176400 WV Central

Qs 937 1,260 1,460 1,930 2,220 2,570 2,820 3,060 3,300 3,600

Qr 1,210 1,750 2,140 3,210 4,000 5,080 5,940 6,840 7,800 9,140

Qw 982 1,330 1,560 2,180 2,620 3,200 3,630 4,070 4,510 5,090

182 03176500 VA Central

Qs 20,700 30,600 38,400 63,600 85,500 120,000 152,000 189,000 233,000 304,000

183 03177500 WV Central

Qs

a3,040 3,630 3,950 4,610 4,980 5,380 5,640 5,880 6,100 6,370

Qr 4,020 5,630 6,750 9,780 12,000 14,900 17,200 19,600 22,200 25,700

Qw 3,180 3,860 4,280 5,400 6,200 7,210 7,940 8,640 9,320 10,200

184 03177700 VA Central

Qs 461 616 713 942 1,090 1,270 1,400 1,520 1,650 1,810

Qr 965 1,410 1,730 2,610 3,270 4,170 4,880 5,640 6,430 7,560

Qw 510 679 795 1,130 1,370 1,690 1,940 2,180 2,420 2,740

185 03178500 WV Central

Qs 639 1,120 1,460 2,400 3,080 3,970 4,650 5,340 6,050 7,010

Qr 793 1,170 1,430 2,180 2,730 3,500 4,100 4,740 5,420 6,380

Qw 650 1,120 1,460 2,380 3,030 3,890 4,560 5,240 5,940 6,890

186 03179000 WV Central

Qs 4,120 6,640 8,270 12,200 14,700 17,600 19,600 21,500 23,300 25,600

Qr 7,880 10,800 12,900 18,200 22,100 27,200 31,200 35,400 39,800 45,900

Qw 4,200 6,720 8,370 12,400 15,000 18,100 20,200 22,300 24,200 26,700

187 03179500 WV Central

Qs 5,590 7,620 8,870 11,800 13,600 15,900 17,400 19,000 20,400 22,400

Qr 8,670 11,900 14,100 19,900 24,000 29,600 33,900 38,500 43,200 49,800

Qw 5,740 7,800 9,100 12,300 14,400 17,100 19,000 20,900 22,700 25,100

188 03180000 WV Central

Qs 27,300 38,600 47,100 73,100 94,500 127,000 156,000 188,000 226,000 284,000

189 03180350 WV Central

Qs 32.4 44.3 52.9 78.5 98.8 129 154 183 215 263

Qr 37.3 60 77.2 129 170 228 276 327 383 462

Qw 33.4 47 57.1 89.9 118 158 193 230 272 333

190 03180500 WV Central

Qs 2,840 3,730 4,470 6,990 9,300 13,100 16,800 21,400 27,000 36,400

Qr 2,920 4,120 4,970 7,260 8,930 11,200 13,000 14,800 16,800 19,500

Qw 2,840 3,740 4,480 7,000 9,280 13,000 16,500 20,800 26,000 34,700

191 03180530 WV Central

Qs 28.5 50.5 69.3 135 197 302 402 524 673 920

Qr 41.8 67 86 143 188 252 305 362 422 510

Qw 31.2 53.5 72.6 138 194 282 360 449 552 711
Table 3 63

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

192 03180680 WV Central Qs 45.7 73.9 95.6 163 218 302 375 457 551 693

Qr 48.9 78 100 166 217 290 350 415 484 583

Qw 46.3 74.6 96.4 164 218 298 366 441 524 648

193 03181900 WV Central Qs 6.7 9 10.4 14 16.4 19.4 21.7 23.9 26.2 29.3

Qr 4.07 6.98 9.28 16.6 22.6 31.5 38.9 47.1 55.9 68.8

Qw 5.93 8.52 10.1 14.8 18.3 23.4 27.6 31.9 36.4 42.8

194 03182000 WV Central Qs 3,280 4,200 4,880 6,860 8,430 10,700 12,700 14,900 17,300 21,000

Qr 2,410 3,430 4,140 6,090 7,510 9,440 11,000 12,600 14,200 16,600

Qw 3,180 4,130 4,810 6,760 8,270 10,500 12,300 14,300 16,600 19,900

195 03182500 WV Central Qs 11,300 15,300 18,200 26,300 32,600 41,400 48,800 56,900 65,800 78,800

Qr 10,500 14,300 16,900 23,700 28,600 35,100 40,200 45,500 51,000 58,700

Qw 11,300 15,300 18,200 26,200 32,400 41,100 48,400 56,300 64,900 77,600

196 03182700 WV Central Qs 6,020 7,910 9,240 13,000 15,800 19,800 23,100 26,700 30,700 36,500

Qr 3,130 4,430 5,320 7,770 9,540 11,900 13,800 15,800 17,900 20,800

Qw 5,650 7,540 8,810 12,200 14,600 18,100 20,900 24,000 27,400 32,300

197 03183000 WV Central Qs 1,290 2,030 2,560 4,020 5,090 6,560 7,720 8,950 10,200 12,100

Qr 1,850 2,650 3,210 4,770 5,900 7,450 8,670 9,950 11,300 13,200

Qw 1,320 2,060 2,600 4,080 5,170 6,670 7,850 9,090 10,400 12,200

198 03183500 WV Central Qs 20,300 28,600 33,900 46,800 55,000 65,200 72,600 79,900 87,100 96,600

Qr 24,500 32,500 37,900 52,000 61,800 74,800 84,900 95,400 106,000 121,000

Qw 20,400 28,600 33,900 46,800 55,200 65,500 73,000 80,400 87,700 97,300

199 03183550 WV Central Qs 187 246 280 357 402 454 490 523 555 594

Qr 114 178 225 363 469 619 741 871 1,010 1,210

Qw 169 232 269 358 421 504 568 632 697 784

200 03183570 WV Central Qs 55.4 96.9 130 232 317 445 556 680 820 1,030

Qr 71.7 113 144 236 308 409 491 580 675 810

Qw 58.5 99.7 133 233 314 432 531 640 759 935

201 03184000 WV Central Qs 24,000 31,700 36,700 49,200 57,500 68,200 76,200 84,400 92,700 104,000

Qr 28,600 37,900 44,100 60,100 71,300 86,100 97,500 109,000 122,000 139,000

Qw 24,100 31,800 36,800 49,400 57,900 68,800 77,100 85,400 93,900 106,000
64 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 202 03184200 WV Central

Qs 210 420 599 1,210 1,770 2,650 3,440 4,370 5,450 7,130

Qr 230 351 439 694 888 1,160 1,380 1,610 1,850 2,200

Qw 213 411 576 1,100 1,520 2,150 2,690 3,300 3,990 5,040

203 03184500 WV Central

Qs 42,700 63,200 77,700 119,000 149,000 192,000 227,000 265,000 306,000 365,000

204 03185000 WV Central

Qs 619 972 1,230 1,940 2,480 3,220 3,830 4,470 5,160 6,140

Qr 1,250 1,810 2,210 3,320 4,140 5,250 6,140 7,070 8,050 9,440

Qw 646 1,000 1,270 2,030 2,610 3,410 4,060 4,750 5,480 6,520

205 03185020 WV Central

Qs 11 22.1 30.8 56.4 75.8 102 123 144 167 197

Qr 21.6 35.2 45.7 77.6 103 140 170 203 238 288

Qw 12.9 24.3 33.5 61.8 84 115 140 166 193 232

206 03185500 WV Central

Qs 51,700 75,400 91,000 131,000 157,000 191,000 216,000 242,000 268,000 302,000

207 03186000 WV Central

Qs 50,500 77,600 95,700 142,000 174,000 214,000 244,000 274,000 304,000 345,000

208 03186500 WV Central

Qs 4,810 6,670 7,980 11,700 14,500 18,400 21,700 25,200 29,100 34,700

Qr 2,810 3,990 4,800 7,030 8,650 10,800 12,600 14,400 16,300 18,900

Qw 4,740 6,600 7,890 11,500 14,200 17,900 21,000 24,400 28,000 33,400

209 03187000 WV Central

Qs 6,570 9,290 11,200 16,400 20,200 25,500 29,800 34,400 39,200 46,300

Qr 4,920 6,860 8,200 11,800 14,400 17,900 20,600 23,500 26,400 30,600

Qw 6,520 9,230 11,100 16,200 19,900 25,100 29,200 33,600 38,300 45,100

210 03187300 WV Central

Qs 419 632 790 1,270 1,650 2,210 2,700 3,240 3,850 4,780

Qr 268 407 508 800 1,020 1,330 1,580 1,840 2,120 2,520

Qw 396 603 751 1,170 1,500 1,970 2,370 2,810 3,290 4,020

211 03187500 WV Central

Qs 2,890 4,040 4,850 7,090 8,760 11,100 13,000 15,000 17,200 20,400

Qr 1,840 2,640 3,200 4,750 5,880 7,420 8,630 9,910 11,300 13,200

Qw 2,840 3,980 4,770 6,930 8,520 10,700 12,500 14,400 16,500 19,500

212 03189000 WV Central

Qs 5,030 6,920 8,360 12,800 16,400 22,000 26,900 32,600 39,100 49,300

Qr 3,250 4,590 5,520 8,040 9,870 12,300 14,300 16,300 18,500 21,500

Qw 4,930 6,810 8,220 12,400 15,800 20,900 25,400 30,400 36,200 45,100

213 03189100 WV Central

Qs 14,700 21,300 25,800 37,800 46,400 58,000 67,100 76,600 86,600 101,000

Qr 10,300 14,000 16,600 23,300 28,100 34,500 39,500 44,700 50,100 57,700

Qw 14,500 21,000 25,500 37,000 45,100 56,000 64,500 73,500 82,900 96,000
Table 3 65

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

214 03189500 WV Central Qs 15,500 20,500 24,100 34,300 42,100 53,200 62,300 72,400 83,400 99,600

Qr 13,000 17,500 20,700 28,900 34,700 42,400 48,400 54,700 61,200 70,300

Qw 15,400 20,400 24,000 34,000 41,600 52,300 61,100 70,700 81,200 96,600

215 03189650 WV Central Qs 86.2 137 173 269 336 425 494 564 637 736

Qr 85 133 169 276 359 475 571 672 781 937

Qw 85.9 136 172 270 343 442 521 603 689 810

216 03190000 WV Central Qs 3,880 5,180 6,000 8,020 9,350 11,000 12,300 13,500 14,700 16,400

Qr 5,890 8,160 9,730 13,900 16,900 21,000 24,100 27,400 30,900 35,700

Qw 3,940 5,250 6,090 8,230 9,680 11,500 12,900 14,300 15,700 17,500

217 03190100 WV Central Qs 581 1,150 1,650 3,460 5,190 8,100 10,900 14,300 18,300 25,000

Qr 598 886 1,090 1,680 2,110 2,720 3,200 3,710 4,240 5,010

Qw 585 1,090 1,520 2,840 3,890 5,450 6,800 8,340 10,100 12,800

218 03190400 WV Central Qs 5,310 7,430 8,910 13,000 15,900 20,000 23,400 26,900 30,700 36,100

Qr 7,340 10,100 12,000 17,100 20,700 25,500 29,300 33,200 37,400 43,100

Qw 5,390 7,520 9,020 13,200 16,200 20,500 23,900 27,500 31,300 36,800

219 03190500 WV Central Qs 202 278 324 434 504 587 646 704 760 833

Qr 124 193 244 393 508 668 799 939 1,090 1,300

Qw 182 260 307 423 505 615 700 788 878 1,000

220 03191400 WV Central Qs 86.3 168 237 469 674 998 1,290 1,630 2,020 2,620

Qr 115 179 227 366 473 624 747 878 1,020 1,220

Qw 90.2 169 236 447 622 882 1,110 1,360 1,640 2,060

221 03191500 WV Central Qs 1,160 1,970 2,600 4,490 6,020 8,280 10,200 12,300 14,700 18,200

Qr 977 1,430 1,750 2,640 3,300 4,210 4,930 5,690 6,500 7,630

Qw 1,150 1,940 2,550 4,310 5,680 7,660 9,310 11,100 13,100 16,100

222 03192000 WV Central Qs 26,800 35,500 41,300 56,800 67,800 82,700 94,500 107,000 120,000 138,000

Qr 23,700 31,500 36,800 50,500 60,000 72,700 82,600 92,800 103,000 118,000

Qw 26,700 35,400 41,100 56,400 67,300 81,900 93,400 105,000 118,000 136,000

223 03192500 WV Central Qs 21,300 30,500 37,000 54,900 68,300 86,900 102,000 118,000 136,000 161,000

Qr 25,100 33,300 38,900 53,200 63,200 76,500 86,800 97,500 109,000 124,000

Qw 21,600 30,700 37,200 54,700 67,500 85,000 98,900 114,000 129,000 152,000
66 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 224 03193000 WV Central

Qs 72,300 103,000 123,000 174,000 207,000 249,000 281,000 312,000 344,000 387,000

225 03193725 WV Central

Qs 10.2 15 18.3 27.3 33.8 42.6 49.5 56.8 64.5 75.2

Qr 12.1 20.1 26.3 45.6 61 83.5 102 122 144 176

Qw 10.6 16 19.8 31.8 41.4 55.2 66.5 78.5 91.3 109

226 03193830 WV Central

Qs 116 180 232 408 571 840 1,100 1,410 1,800 2,430

Qr 57 91 116 191 250 333 402 475 553 666

Qw 104 164 211 352 471 656 824 1,020 1,250 1,620

227 03194700 WV Central

Qs 7,320 9,850 11,700 16,800 20,800 26,500 31,200 36,400 42,100 50,600

Qr 5,490 7,630 9,100 13,100 15,900 19,700 22,700 25,800 29,100 33,600

Qw 7,270 9,800 11,600 16,700 20,600 26,100 30,700 35,700 41,200 49,400

228 03195000 WV Central

Qs 8,340 10,100 11,100 13,600 15,200 17,000 18,400 19,700 21,100 22,800

229 03195100 WV Central

Qs 1,470 2,010 2,400 3,520 4,380 5,630 6,670 7,820 9,090 11,000

Qr 1,230 1,790 2,180 3,280 4,090 5,190 6,060 6,980 7,960 9,330

Qw 1,420 1,970 2,360 3,460 4,300 5,480 6,460 7,520 8,660 10,300

230 03195250 WV Central

Qs 1,490 2,060 2,460 3,590 4,450 5,670 6,670 7,750 8,940 10,700

Qr 1,120 1,620 1,980 2,990 3,730 4,740 5,550 6,400 7,290 8,560

Qw 1,460 2,030 2,430 3,530 4,360 5,530 6,490 7,520 8,650 10,300

231 03195500 WV Central

Qs 12,600 16,800 19,600 26,900 32,100 39,000 44,500 50,200 56,200 64,700

Qr 10,500 14,300 16,900 23,800 28,700 35,200 40,300 45,600 51,100 58,800

Qw 12,500 16,700 19,400 26,600 31,700 38,500 43,900 49,500 55,400 63,700

232 03195600 WV Central

Qs 577 773 902 1,240 1,470 1,770 2,010 2,250 2,500 2,850

Qr 182 279 350 558 716 938 1,120 1,310 1,510 1,800

Qw 507 702 821 1,100 1,300 1,560 1,770 1,990 2,220 2,550

233 03197000 WV West

Qs 18,100 23,500 27,200 37,300 44,600 54,500 62,500 71,000 80,000 93,000

Qr 12,300 18,100 22,100 32,800 40,200 49,700 56,900 64,200 71,500 81,400

Qw 17,600 23,100 26,900 36,900 44,000 53,800 61,500 69,700 78,300 90,500

234 03197150 WV West

Qs 133 187 222 312 373 452 511 572 634 718

Qr 97 164 215 363 476 633 759 892 1,030 1,230

Qw 125 183 221 322 399 506 591 680 773 900
Table 3 67

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

235 03197900 WV West Qs 33.1 53.7 68.8 112 146 193 231 273 317 381

Qr 33 57.6 76.6 133 177 240 290 344 402 483

Qw 33.1 54.7 70.7 119 158 214 260 309 362 436

236 03198350 WV West Qs 683 1,440 2,120 4,570 6,880 10,700 14,300 18,600 23,700 31,900

Qr 1,340 2,100 2,650 4,170 5,280 6,750 7,890 9,070 10,300 11,900

Qw 807 1,550 2,220 4,450 6,280 8,870 11,000 13,300 15,800 19,500

237 03198450 WV West Qs 168 277 362 629 852 1,190 1,490 1,840 2,230 2,830

Qr 272 446 575 945 1,220 1,600 1,900 2,210 2,540 3,000

Qw 184 298 389 687 941 1,320 1,630 1,980 2,350 2,900

238 03198500 WV West Qs 5,320 8,280 10,400 16,400 20,900 27,100 32,200 37,500 43,300 51,600

Qr 5,410 8,160 10,100 15,300 19,000 23,700 27,400 31,100 34,900 40,000

Qw 5,320 8,280 10,400 16,300 20,800 26,900 31,800 36,900 42,400 50,300

239 03198780 WV West Qs 56.2 94.4 122 199 255 331 391 453 517 607

Qr 95.5 162 212 358 469 624 748 880 1,020 1,210

Qw 65.5 107 139 240 323 442 538 638 742 886

240 03198800 WV West Qs 19.8 49 76 172 258 391 507 637 781 995

Qr 68.7 117 154 263 347 464 558 658 763 912

Qw 27.5 58.9 88.3 195 287 420 530 647 772 951

241 03199000 WV West Qs 4,110 7,080 9,290 15,700 20,500 27,300 32,700 38,500 44,600 53,300

Qr 4,070 6,190 7,670 11,700 14,600 18,400 21,200 24,200 27,200 31,300

Qw 4,110 7,040 9,220 15,400 19,900 26,100 31,000 36,100 41,600 49,200

242 03199300 WV West Qs 167 317 432 762 1,010 1,340 1,610 1,880 2,160 2,540

Qr 384 625 801 1,300 1,680 2,190 2,590 3,010 3,440 4,050

Qw 202 358 484 874 1,190 1,620 1,960 2,310 2,680 3,170

243 03199400 WV West Qs 5,010 7,920 10,000 16,100 20,800 27,300 32,700 38,500 44,800 53,800

Qr 4,620 7,000 8,670 13,200 16,400 20,600 23,800 27,100 30,400 34,900

Qw 4,920 7,740 9,740 15,300 19,200 24,500 28,500 32,800 37,300 43,600

244 03200500 WV West Qs 11,800 17,100 20,300 28,100 32,900 38,600 42,600 46,500 50,200 55,000

Qr 9,890 14,700 18,000 26,800 32,900 40,900 46,900 53,000 59,100 67,500

Qw 11,700 17,000 20,200 28,000 32,900 38,800 43,100 47,300 51,300 56,600
68 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 245 03200600 WV West

Qs 43.1 67 84 131 166 214 252 292 335 395

Qr 51.2 88.2 116 200 265 356 429 507 590 706

Qw 45.4 71.6 91 151 200 271 330 391 456 547

246 03201000 WV West

Qs 3,810 5,590 6,760 9,680 11,600 14,000 15,900 17,600 19,400 21,800

Qr 3,710 5,650 7,020 10,700 13,400 16,900 19,500 22,300 25,000 28,800

Qw 3,800 5,590 6,770 9,740 11,800 14,300 16,300 18,200 20,200 22,800

247 03201405 WV West

Qs 1,200 1,750 2,100 2,970 3,530 4,220 4,720 5,220 5,710 6,350

Qr 700 1,120 1,420 2,280 2,910 3,760 4,420 5,110 5,820 6,810

Qw 1,020 1,570 1,910 2,720 3,260 3,990 4,570 5,160 5,770 6,610

248 03201410 WV West

Qs 463 631 734 980 1,140 1,320 1,460 1,590 1,720 1,890

Qr 291 476 614 1,010 1,300 1,700 2,020 2,350 2,700 3,180

Qw 419 602 712 986 1,180 1,450 1,660 1,870 2,090 2,390

249 03201420 WV West

Qs 159 222 259 345 397 458 500 540 578 626

Qr 98 166 218 368 482 641 769 903 1,050 1,240

Qw 140 209 249 352 427 530 612 697 783 899

250 03201440 WV West

Qs 160 241 301 476 615 817 989 1,180 1,390 1,700

Qr 59 101 133 227 300 402 484 572 664 795

Qw 121 198 250 379 469 595 701 817 944 1,130

251 03201480 WV West

Qs 48.9 95.8 133 243 328 447 543 644 750 898

Qr 43.3 75 99.4 172 227 306 370 438 510 612

Qw 47.2 90.6 124 218 285 377 450 528 611 729

252 03202000 OH West

Qs 3,570 5,010 6,030 8,850 11,000 13,900 16,300 18,900 21,700 25,700

253 03202245 WV West

Qs

a232 a363 458 735 949 1,260 1,510 1,790 2,090 2,540

Qr 190 315 409 678 880 1,160 1,380 1,610 1,860 2,200

Qw 220 352 447 717 923 1,210 1,450 1,700 1,970 2,350

254 03202400 WV West

Qs 2,960 5,820 8,180 15,900 22,300 32,200 40,600 50,200 60,800 76,600

Qr 4,490 6,810 8,430 12,800 16,000 20,100 23,200 26,400 29,600 34,000

Qw 3,050 5,870 8,190 15,600 21,500 30,100 37,100 44,800 53,100 65,300
Table 3 69

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

255 03202480 WV West Qs 115 251 363 712 988 1,380 1,690 2,020 2,370 2,850

Qr 260 428 553 909 1,180 1,540 1,830 2,130 2,450 2,890

Qw 132 269 383 745 1,030 1,420 1,740 2,060 2,400 2,860

256 03202750 WV West Qs 2,410 3,560 4,340 6,400 7,870 9,810 11,300 12,900 14,500 16,800

Qr 2,280 3,530 4,410 6,840 8,590 10,900 12,700 14,500 16,400 18,900

Qw 2,400 3,560 4,350 6,450 7,960 10,000 11,600 13,200 14,900 17,300

257 03203000 WV West Qs 10,200 16,300 20,200 30,100 36,500 44,300 49,900 55,300 60,600 67,300

Qr 8,970 13,300 16,400 24,500 30,100 37,400 43,000 48,600 54,300 62,000

Qw 10,100 16,200 20,000 29,800 36,000 43,500 49,000 54,400 59,700 66,500

258 03203600 WV West Qs 11,200 19,300 24,900 39,400 49,000 60,900 69,500 77,900 86,100 96,700

Qr 9,640 14,300 17,500 26,100 32,200 40,000 45,800 51,800 57,800 66,000

Qw 11,000 18,700 24,100 37,100 45,300 55,100 62,300 69,400 76,500 85,900

259 03204000 WV West Qs 12,000 18,700 23,000 32,900 38,900 45,900 50,600 55,100 59,200 64,400

Qr 12,900 19,000 23,200 34,400 42,100 52,100 59,600 67,100 74,800 85,100

Qw 12,000 18,700 23,000 33,000 39,100 46,400 51,500 56,300 60,900 66,600

260 03204500 WV West Qs 3,330 5,040 6,290 9,940 12,800 16,900 20,300 24,100 28,200 34,300

Qr 3,920 5,960 7,400 11,300 14,100 17,700 20,500 23,400 26,300 30,200

Qw 3,370 5,080 6,340 10,000 12,900 17,000 20,300 24,000 27,900 33,500

261 03205995 OH West Qs 62.6 91.8 113 175 224 294 354 419 491 599

Qr 44.7 77.4 102 177 234 315 381 450 524 629

Qw 57.4 88.6 111 176 227 303 366 434 507 614

262 03206450 WV West Qs a246 484 678 1,290 1,790 2,530 3,160 3,850 4,600 5,700

Qr 165 274 356 593 772 1,020 1,220 1,420 1,640 1,940

Qw 215 414 567 968 1,230 1,580 1,870 2,170 2,500 2,970

263 03206600 WV West Qs 980 1,460 1,770 2,560 3,090 3,750 4,230 4,720 5,200 5,850

Qr 923 1,460 1,860 2,950 3,750 4,820 5,660 6,520 7,410 8,650

Qw 975 1,460 1,780 2,600 3,160 3,900 4,460 5,020 5,590 6,350

264 03206800 WV West Qs 2,020 2,830 3,390 4,870 5,940 7,380 8,520 9,720 11,000 12,800

Qr 2,460 3,790 4,740 7,330 9,200 11,700 13,600 15,500 17,500 20,200

Qw 2,090 2,940 3,540 5,260 6,590 8,440 9,910 11,400 13,000 15,200
70 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 265 03207000 WV West

Qs 3,300 5,160 6,480 10,100 12,700 16,200 19,000 22,000 25,000 29,300

266 03207020 WV West

Qs 3,330 5,180 6,470 9,980 12,500 15,900 18,500 21,300 24,200 28,200

Qr 4,420 6,710 8,310 12,700 15,700 19,800 22,900 26,000 29,200 33,600

Qw 3,400 5,250 6,560 10,200 12,800 16,400 19,200 22,100 25,000 29,200

267 03207400 VA West

Qs 219 551 863 2,010 3,070 4,760 6,270 8,000 9,960 12,900

Qr 560 901 1,150 1,850 2,370 3,070 3,620 4,190 4,790 5,610

Qw 247 578 888 1,980 2,920 4,290 5,420 6,650 8,000 9,960

268 03207500 VA West

Qs 3,890 7,090 9,390 15,500 19,800 25,200 29,200 33,100 37,000 42,100

Qr 3,720 5,670 7,040 10,800 13,400 16,900 19,600 22,300 25,100 28,900

Qw 3,880 7,010 9,250 15,100 19,000 23,900 27,500 31,000 34,600 39,300

269 03207800 VA West

Qs 3,400 6,410 8,840 16,500 22,900 32,500 40,700 49,800 60,000 75,100

Qr 4,390 6,660 8,250 12,600 15,600 19,700 22,700 25,800 29,000 33,400

Qw 3,460 6,420 8,810 16,200 22,000 30,200 37,000 44,400 52,400 64,000

270 03207962 KY West

Qs 20.8 44.3 64.1 128 182 261 328 402 481 597

Qr 48.9 84.4 112 192 254 341 412 487 567 679

Qw 28.4 53.7 75.8 151 213 302 374 451 532 648

271 03208000 KY West

Qs 6,260 9,710 12,100 18,200 22,400 27,900 32,000 36,200 40,500 46,300

Qr 5,420 8,180 10,100 15,300 19,000 23,800 27,400 31,200 34,900 40,100

Qw 6,180 9,600 12,000 17,900 21,900 27,100 31,100 35,100 39,200 44,800

272 03208500 VA West

Qs 5,190 9,590 12,900 22,400 29,400 38,900 46,300 54,000 61,900 72,800

Qr 4,260 6,470 8,030 12,200 15,200 19,200 22,100 25,200 28,300 32,500

Qw 5,150 9,490 12,700 21,800 28,300 36,800 43,400 50,200 57,200 66,800

273 03208950 VA West

Qs 1,040 1,830 2,470 4,520 6,280 9,010 11,400 14,200 17,400 22,300

Qr 1,400 2,200 2,770 4,350 5,490 7,020 8,210 9,430 10,700 12,400

Qw 1,060 1,850 2,490 4,510 6,180 8,670 10,800 13,200 15,800 19,800

274 03209000 VA West

Qs 4,630 7,440 9,410 14,800 18,600 23,600 27,600 31,600 35,800 41,600

Qr 3,500 5,350 6,650 10,200 12,700 16,000 18,600 21,200 23,800 27,400

Qw 4,530 7,300 9,220 14,300 17,800 22,300 25,800 29,400 33,100 38,200
Table 3 71

Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued[Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis]

Identification 

number

Streamgage 

station 

number

State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP)

275 03209575 KY West Qs 164 232 282 425 538 702 841 995 1,170 1,420

Qr 137 230 299 501 654 865 1,030 1,210 1,400 1,660

Qw 156 232 286 449 582 775 934 1,100 1,290 1,550

276 03210000 KY West Qs 1,180 2,020 2,590 4,050 5,000 6,180 7,010 7,820 8,600 9,600

Qr 1,230 1,940 2,450 3,860 4,890 6,260 7,330 8,420 9,560 11,100

Qw 1,180 2,020 2,580 4,040 5,000 6,180 7,050 7,900 8,730 9,810

277 03211500 KY West Qs 2,150 3,410 4,270 6,590 8,210 10,300 12,000 13,700 15,400 17,700

Qr 3,320 5,080 6,320 9,700 12,100 15,300 17,700 20,200 22,700 26,200

Qw 2,360 3,640 4,560 7,220 9,220 11,900 14,000 16,100 18,300 21,200

278 03212000 KY West Qs 2,060 3,820 5,180 9,170 12,200 16,500 19,900 23,500 27,400 32,700

Qr 1,960 3,040 3,810 5,930 7,460 9,490 11,100 12,700 14,300 16,600

Qw 2,050 3,760 5,060 8,740 11,400 14,900 17,600 20,500 23,500 27,600

279 03212750 WV West Qs 1,140 2,230 3,110 5,930 8,270 11,700 14,700 18,000 21,600 27,000

Qr 2,920 4,480 5,580 8,600 10,800 13,600 15,800 18,000 20,300 23,400

Qw 1,290 2,390 3,300 6,260 8,690 12,200 15,000 18,000 21,200 25,800

280 03212980 WV West Qs 2,440 4,170 5,380 8,570 10,700 13,500 15,600 17,600 19,700 22,300

Qr 3,360 5,130 6,380 9,800 12,200 15,400 17,900 20,400 23,000 26,400

Qw 2,540 4,250 5,470 8,730 11,000 13,900 16,200 18,400 20,600 23,500

281 03213000 WV West Qs 5,500 9,490 12,300 20,100 25,500 32,700 38,100 43,600 49,200 56,700

Qr 6,570 9,850 12,100 18,300 22,600 28,300 32,600 36,900 41,300 47,300

Qw 5,550 9,500 12,300 20,000 25,300 32,200 37,400 42,700 48,000 55,300

282 03213500 WV West Qs 508 1,120 1,640 3,400 4,920 7,220 9,200 11,400 13,800 17,400

Qr 782 1,250 1,580 2,530 3,220 4,150 4,880 5,640 6,420 7,490

Qw 525 1,130 1,640 3,310 4,680 6,640 8,260 10,000 11,900 14,700

283 03213700 WV West Qs 7,950 13,300 17,400 29,300 38,600 51,900 62,900 74,800 87,700 106,000

Qr 10,500 15,600 19,100 28,400 34,900 43,300 49,600 56,000 62,500 71,200

Qw 8,090 13,400 17,500 29,200 38,200 50,700 60,800 71,500 82,900 99,300

284 03214000 WV West Qs 10,400 18,200 24,100 41,400 54,700 73,500 88,800 105,000 123,000 148,000
72 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states.—Continued [Identification number refers to the number in figure 3; %, percent; AOP, annual-occurrence probability; WV, West Virginia; MD, Maryland; VA, Virginia; OH, Ohio; PA, Pennsylvania; KY, Kentucky; East, Eastern Panhandle Region; Central, Central Mountains Region; West, Western Plateaus Region. Flood-frequency discharges are presented in the following estimate-type order: first line (Qs), from the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009); second line (Qr), from the regionalized regression equation; and third line (Qw), from weighting (1) the systematic and historical record using guidelines established by the Interagency Advisory Committee on Water Data (1982) with the West Virginia skew (Atkins and others, 2009) and (2) the regionalized regression equation, using the number of years of peak discharge and equivalent years of record. Shading indicates the 44 streamgage stations removed from consideration as part of the regional regression analysis] Identification number Streamgage station number State Region Estimate type Flood discharge, in cubic feet per second 1.1-year (90% AOP) 1.5-year (67% AOP) 2-year (50% AOP) 5-year (20% AOP) 10-year (10% AOP) 25-year (4% AOP) 50-year (2% AOP) 100-year (1% AOP) 200-year (0.5% AOP) 500-year (0.2% AOP) 285 03214500 WV West

Qs 10,500 18,000 23,600 39,200 50,800 66,600 79,200 92,200 106,000 125,000

Qr 13,400 19,700 24,000 35,500 43,400 53,700 61,400 69,200 77,000 87,600

Qw 10,600 18,000 23,600 39,100 50,400 65,700 77,700 90,100 103,000 121,000

286 03214900 WV West

Qs 9,240 14,900 18,900 30,000 38,200 49,300 58,000 67,200 76,900 90,400

Qr 15,200 22,200 27,000 39,800 48,700 60,100 68,600 77,200 85,900 97,600

Qw 10,100 15,700 19,900 31,800 40,600 52,400 61,500 70,800 80,200 93,200

287 03215500 KY West

Qs 3,210 4,860 6,020 9,260 11,700 15,000 17,600 20,500 23,500 27,800

Qr 3,450 5,280 6,560 10,100 12,600 15,800 18,400 20,900 23,500 27,100

Qw 3,220 4,880 6,040 9,320 11,700 15,100 17,700 20,500 23,500 27,700

288 03216500 KY West

Qs 6,090 8,390 9,970 14,200 17,300 21,600 24,900 28,500 32,300 37,800

Qr 5,510 8,300 10,300 15,500 19,300 24,100 27,800 31,600 35,400 40,600

Qw 6,030 8,380 9,990 14,400 17,600 22,000 25,500 29,200 33,000 38,400

289 03216540 KY West

Qs 582 789 929 1,300 1,560 1,920 2,200 2,490 2,800 3,230

Qr 384 625 801 1,300 1,680 2,190 2,590 3,010 3,440 4,050

Qw 540 764 910 1,300 1,590 2,000 2,330 2,670 3,030 3,540

290 03216563 KY West

Qs 111 158 190 272 330 406 465 527 590 678

Qr 54 93 123 211 280 375 452 534 621 743

Qw 90 139 171 250 309 391 459 531 607 714

aDischarge was computed outside the PeakFQ computer program (Flynn and others, 2006) using the HARTIV subroutine (Kirby, 1980) and by computing the antilog of the discharge from equation 1 (Interagency Advisory Committee on Water Data, 1982, p. 9–10).
Table 5 73

Table 5. Description of the 88 pairs of U.S. Geological Survey streamgage stations in West Virginia and adjacent states that were evaluated to quantify “near” for application of the drainage-area ratio method in this study.—Continued[Identification number refers to the number in figure 3; MD, Maryland; WV, West Virginia; VA, Virginia; PA, Pennsylvania; OH, Ohio; KY, Kentucky; N., North; S., South; E., East; R., River; Br., Branch; Fk., Fork; nr, near; blw, below]

Pair 

number

Upstream station Downstream station

Identification 

number

Streamgage 

station 

number

Station name State

Identification 

number

Streamgage 

station 

number

Station name State

1 1 01595000 North Branch Potomac River at Steyer MD 3 01595500 North Br. Potomac River at Kitzmiller MD2 1 01595000 North Branch Potomac River at Steyer MD 12 01603000 N. Br. Potomac River near Cumberland MD3 3 01595500 North Br. Potomac River at Kitzmiller MD 4 01596000 North Br. Potomac River at Bloomington MD4 4 01596000 North Br. Potomac River at Bloomington MD 10 01600000 North Branch Potomac River at Pinto MD5 4 01596000 North Br. Potomac River at Bloomington MD 12 01603000 N. Br. Potomac River near Cumberland MD6 10 01600000 North Branch Potomac River at Pinto MD 12 01603000 N. Br. Potomac River near Cumberland MD7 14 01605500 South Branch Potomac River at Franklin WV 17 01606500 S. Br. Potomac River near Petersburg WV8 14 01605500 South Branch Potomac River at Franklin WV 23 01608500 S. Br. Potomac River near Springfield WV9 17 01606500 S. Br. Potomac River near Petersburg WV 23 01608500 S. Br. Potomac River near Springfield WV

10 19 01607500 S. Fk. S. Br. Potomac R. at Brandywine WV 21 01608000 S. Fk. S. Br. Potomac R. near Moorefield WV

11 26 01609650 Little Cacapon River at Frenchburg WV 27 01609800 Little Cacapon River near Levels WV

12 31 01610500 Cacapon River at Yellow Spring WV 32 01611500 Cacapon River near Great Cacapon WV13 39 01615000 Opequon Creek near Berryville VA 41 01616500 Opequon Creek near Martinsburg WV14 56 01632000 N. Fk. Shenandoah R. at Cootes Store VA 61 01633000 N. Fk. Shenandoah R. at Mount Jackson VA15 56 01632000 N. Fk. Shenandoah R. at Cootes Store VA 64 01634000 N. Fk. Shenandoah River near Strasburg VA16 61 01633000 N. Fk. Shenandoah R. at Mount Jackson VA 64 01634000 N. Fk. Shenandoah River near Strasburg VA17 71 01643700 Goose Creek near Middleburg VA 72 01644000 Goose Creek near Leesburg VA18 77 02011480 Back Cr. at Rt. 600 near Mountain Grove VA 78 02011500 Back Creek near Mountain Grove VA19 83 03050000 Tygart Valley River near Dailey WV 84 03050500 Tygart Valley River near Elkins WV20 83 03050000 Tygart Valley River near Dailey WV 96 03056500 Tygart Valley River at Fetterman WV21 84 03050500 Tygart Valley River near Elkins WV 86 03051000 Tygart Valley River at Belington WV22 86 03051000 Tygart Valley River at Belington WV 92 03054500 Tygart Valley River at Phillipi WV23 86 03051000 Tygart Valley River at Belington WV 96 03056500 Tygart Valley River at Fetterman WV24 92 03054500 Tygart Valley River at Phillipi WV 96 03056500 Tygart Valley River at Fetterman WV25 87 03051500 Middle Fork River at Midvale WV 88 03052000 Middle Fork River at Audra WV26 93 03055020 Bonica Run on U.S. 250 near Phillipi WV 94 03055040 Bonica Run on Route 38 near Phillipi WV27 98 03057300 West Fork River at Walkersville WV 100 03058000 West Fork R. blw Stonewall Jackson Dam nr Weston WV28 98 03057300 West Fork River at Walkersville WV 105 03061000 West Fork River at Enterprise WV29 100 03058000 West Fork R. blw Stonewall Jackson Dam nr Weston WV 101 03058500 West Fork River at Butcherville WV30 101 03058500 West Fork River at Butcherville WV 102 03059000 West Fork River at Clarksburg WV
74 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia Table 5. Description of the 88 pairs of U.S. Geological Survey streamgage stations in West Virginia and adjacent states that were evaluated to quantify “near” for application of the drainage-area ratio method in this study.—Continued [Identification number refers to the number in figure 3; MD, Maryland; WV, West Virginia; VA, Virginia; PA, Pennsylvania; OH, Ohio; KY, Kentucky; N., North; S., South; E., East; R., River; Br., Branch; Fk., Fork; nr, near; blw, below] Pair number Upstream station Downstream station Identi- fication number Streamgage station number Station name State Identi- fication number Streamgage station number Station name State 31 101 03058500 West Fork River at Butcherville WV 105 03061000 West Fork River at Enterprise WV 32 102 03059000 West Fork River at Clarksburg WV 105 03061000 West Fork River at Enterprise WV 33 110 03065000 Dry Fork at Hendricks WV 118 03069500 Cheat River near Parsons WV 34 110 03065000 Dry Fork at Hendricks WV 123 03071000 Cheat River near Pisgah WV 35 118 03069500 Cheat River near Parsons WV 121 03070000 Cheat River at Rowlesburg WV 36 118 03069500 Cheat River near Parsons WV 123 03071000 Cheat River near Pisgah WV 37 121 03070000 Cheat River at Rowlesburg WV 123 03071000 Cheat River near Pisgah WV 38 111 03065400 Blackwater River near Davis WV 112 03066000 Blackwater River at Davis WV 39 114 03067500 Shavers Fork at Cheat Bridge WV 116 03068800 Shavers Fork below Bowden WV 40 114 03067500 Shavers Fork at Cheat Bridge WV 118 03069500 Cheat River near Parsons WV 41 116 03068800 Shavers Fork below Bowden WV 118 03069500 Cheat River near Parsons WV 42 154 03115400 Little Muskingum River at Bloomfield OH 156 03115500 Little Muskingum River at Fay OH 43 161 03151400 Little Kanawha River near Wildcat WV 162 03151500 Little Kanawha River near Burnsville WV 44 161 03151400 Little Kanawha River near Wildcat WV 171 03155000 Little Kanawha River at Palestine WV 45 162 03151500 Little Kanawha River near Burnsville WV 163 03152000 Little Kanawha River at Glenville WV 46 163 03152000 Little Kanawha River at Glenville WV 167 03153500 Little Kanawha River at Grantsville WV 47 163 03152000 Little Kanawha River at Glenville WV 171 03155000 Little Kanawha River at Palestine WV 48 167 03153500 Little Kanawha River at Grantsville WV 171 03155000 Little Kanawha River at Palestine WV 49 172 03155200 South Fork Hughes River at Macfarlan WV 174 03155500 Hughes River at Cisco WV 50 184 03177700 Bluestone River at Bluefield VA 186 03179000 Bluestone River near Pipestem WV 51 184 03177700 Bluestone River at Bluefield VA 187 03179500 Bluestone River at Lilly WV

52 186 03179000 Bluestone River near Pipestem WV 187 03179500 Bluestone River at Lilly WV53 190 03180500 Greenbrier River at Durbin WV 195 03182500 Greenbrier River at Buckeye WV54 190 03180500 Greenbrier River at Durbin WV 201 03184000 Greenbrier River at Hilldale WV55 195 03182500 Greenbrier River at Buckeye WV 198 03183500 Greenbrier River at Alderson WV56 195 03182500 Greenbrier River at Buckeye WV 201 03184000 Greenbrier River at Hilldale WV57 198 03183500 Greenbrier River at Alderson WV 201 03184000 Greenbrier River at Hilldale WV58 208 03186500 Williams River at Dyer WV 209 03187000 Gauley River at Camden on Gauley WV59 209 03187000 Gauley River at Camden on Gauley WV 213 03189100 Gauley River near Craigsville WV60 209 03187000 Gauley River at Camden on Gauley WV 223 03192500 Gauley River at Belva WV
Table 5 75

Table 5. Description of the 88 pairs of U.S. Geological Survey streamgage stations in West Virginia and adjacent states that were evaluated to quantify “near” for application of the drainage-area ratio method in this study.—Continued[Identification number refers to the number in figure 3; MD, Maryland; WV, West Virginia; VA, Virginia; PA, Pennsylvania; OH, Ohio; KY, Kentucky; N., North; S., South; E., East; R., River; Br., Branch; Fk., Fork; nr, near; blw, below]

Pair 

number

Upstream station Downstream station

Identification 

number

Streamgage 

station 

number

Station name State

Identification 

number

Streamgage 

station 

number

Station name State

61 213 03189100 Gauley River near Craigsville WV 214 03189500 Gauley River near Summersville WV62 214 03189500 Gauley River near Summersville WV 222 03192000 Gauley River above Belva WV63 214 03189500 Gauley River near Summersville WV 223 03192500 Gauley River at Belva WV64 222 03192000 Gauley River above Belva WV 223 03192500 Gauley River at Belva WV65 216 03190000 Meadow River at Nallen WV 218 03190400 Meadow River near Mount Lookout WV66 227 03194700 Elk River below Webster Springs WV 231 03195500 Elk River at Sutton WV67 227 03194700 Elk River below Webster Springs WV 233 03197000 Elk River at Queen Shoals WV68 231 03195500 Elk River at Sutton WV 233 03197000 Elk River at Queen Shoals WV69 238 03198500 Big Coal River at Ashford WV 244 03200500 Coal River at Tornado WV70 241 03199000 Little Coal River at Danville WV 243 03199400 Little Coal River at Julian WV71 254 03202400 Guyandotte River near Baileysville WV 257 03203000 Guyandotte River at Man WV72 254 03202400 Guyandotte River near Baileysville WV 259 03204000 Guyandotte River at Branchland WV73 257 03203000 Guyandotte River at Man WV 258 03203600 Guyandotte River at Logan WV74 257 03203000 Guyandotte River at Man WV 259 03204000 Guyandotte River at Branchland WV75 258 03203600 Guyandotte River at Logan WV 259 03204000 Guyandotte River at Branchland WV76 263 03206600 East Fork Twelvepole Creek near Dunlow WV 264 03206800 E. Fk. Twelvepole Creek near East Lynn WV77 263 03206600 East Fork Twelvepole Creek near Dunlow WV 266 03207020 Twelvepole Creek below Wayne WV78 264 03206800 E. Fk. Twelvepole Creek near East Lynn WV 266 03207020 Twelvepole Creek below Wayne WV79 268 03207500 Levisa Fork near Grundy VA 269 03207800 Levisa Fork at Big Rock VA80 268 03207500 Levisa Fork near Grundy VA 271 03208000 Levisa Fork below Fishtrap Dam KY81 269 03207800 Levisa Fork at Big Rock VA 271 03208000 Levisa Fork below Fishtrap Dam KY82 276 03210000 Johns Crek near Meta KY 277 03211500 Johns Creek near Van Lear KY83 279 03212750 Tug Fork at Welch WV 281 03213000 Tug Fork at Litwar WV84 279 03212750 Tug Fork at Welch WV 286 03214900 Tug Fork at Glenhayes WV85 281 03213000 Tug Fork at Litwar WV 283 03213700 Tug Fork at Williamson WV86 283 03213700 Tug Fork at Williamson WV 285 03214500 Tug Fork at Kermit WV87 283 03213700 Tug Fork at Williamson WV 286 03214900 Tug Fork at Glenhayes WV88 285 03214500 Tug Fork at Kermit WV 286 03214900 Tug Fork at Glenhayes WV
76 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

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Appendix 1
78 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia

Appendix 1. Matrices Used to Compute Individual Standard Errors of Prediction

[PK(n_n), peak discharge for the (n.n)-year recurrence interval; PK(n), peak discharge for the (n)-year recurrence interval; %, percent; AOP, annual-occurrence 

probability; γ2, standard error of the model squared; numbers are given in scientific notation where 0.32483E-01 is 0.032483]

Eastern Panhandle Region

PK1_1(90%AOP) γ2 = 0.32483E-01

0.36765E-02 -0.13943E-02

-0.13943E-02 0.79153E-03

PK1_5(67%AOP) γ2 = 0.22559E-01

0.26813E-02 -0.98579E-03

-0.98579E-03 0.55605E-03

PK2(50%AOP) γ2 = 0.18489E-01

0.24610E-02 -0.86628E-03

-0.86628E-03 0.48293E-03

PK5(20%AOP) γ2 = 0.11967E-01

0.24958E-02 -0.76020E-03

-0.76020E-03 0.41065E-03

PK10(10%AOP) γ2 = 0.92526E-02

0.27016E-02 -0.75370E-03

-0.75370E-03 0.40192E-03

PK25(4%AOP) γ2 = 0.71876E-02

0.30780E-02 -0.79872E-03

-0.79872E-03 0.42199E-03

PK50(2%AOP) γ2 = 0.64308E-02

0.34417E-02 -0.86987E-03

-0.86987E-03 0.45750E-03

PK100(1%AOP) γ2 = 0.61728E-02

0.38754E-02 -0.96990E-03

-0.96990E-03 0.50843E-03

PK200(0.5%AOP) γ2 = 0.63080E-02

0.43778E-02 -0.10963E-02

-0.10963E-02 0.57352E-03

PK500(0.2%AOP) γ2 = 0.69967E-02

0.51444E-02 -0.13012E-02

-0.13012E-02 0.68008E-03

Central Mountains Region

PK1_1(90%AOP) γ2 = 0.27978E-01

0.26613E-02 -0.98361E-03

-0.98361E-03 0.47958E-03

PK1_5(67%AOP) γ2 = 0.21308E-01

0.20667E-02 -0.75807E-03

-0.75807E-03 0.36705E-03

PK2(50%AOP) γ2 = 0.19922E-01

0.20406E-02 -0.74156E-03

-0.74156E-03 0.35478E-03

PK5(20%AOP) γ2 = 0.20745E-01

0.24841E-02 -0.88266E-03

-0.88266E-03 0.41029E-03

PK10(10%AOP) γ2 = 0.23263E-01

0.29889E-02 -0.10523E-02

-0.10523E-02 0.48398E-03

PK25(4%AOP) γ2 = 0.27815E-01

0.37621E-02 -0.13163E-02

-0.13163E-02 0.60165E-03

PK50(2%AOP) γ2 = 0.31932E-01

0.44057E-02 -0.15382E-02

-0.15382E-02 0.70196E-03

PK100(1%AOP) γ2 = 0.36527E-01

0.50907E-02 -0.17758E-02

-0.17758E-02 0.81032E-03

PK200(0.5%AOP) γ2 = 0.41553E-01

0.58123E-02 -0.20274E-02

-0.20274E-02 0.92586E-03

PK500(0.2%AOP) γ2 = 0.48810E-01

0.68170E-02 -0.23795E-02

-0.23795E-02 0.10887E-02

Western Plateaus Region

PK1_1(90%AOP) γ2 = 0.25715E-01

0.21782E-02 -0.77332E-03

-0.77332E-03 0.38325E-03

PK1_5(67%AOP) γ2 = 0.19963E-01

0.16074E-02 -0.56593E-03

-0.56593E-03 0.28053E-03

PK2(50%AOP) γ2 = 0.17940E-01

0.14888E-02 -0.51918E-03

-0.51918E-03 0.25507E-03

PK5(20%AOP) γ2 = 0.15490E-01

0.15374E-02 -0.52302E-03

-0.52302E-03 0.24868E-03

PK10(10%AOP) γ2 = 0.15120E-01

0.17035E-02 -0.57249E-03

-0.57249E-03 0.26724E-03

PK25(4%AOP) γ2 = 0.15624E-01

0.19906E-02 -0.66264E-03

-0.66264E-03 0.30467E-03

PK50(2%AOP) γ2 = 0.16517E-01

0.22400E-02 -0.74298E-03

-0.74298E-03 0.33935E-03

PK100(1%AOP) γ2 = 0.17743E-01

0.25100E-02 -0.83124E-03

-0.83124E-03 0.37818E-03

PK200(0.5%AOP) γ2 = 0.19246E-01

0.27968E-02 -0.92609E-03

-0.92609E-03 0.42049E-03

PK500(0.2%AOP) γ2 = 0.21600E-01

0.31977E-02 -0.10601E-02

-0.10601E-02 0.48102E-03
For additional information, write to:

Director

U.S. Geological Survey

West Virginia Water Science Center

11 Dunbar Street

Charleston, WV 25301

or visit our Web site at:

http://wv.usgs.gov/

Document prepared by the West Trenton Publishing Service Center
Wiiley, J.B. and Atkins, J.T.—Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia—Scientific Investigations Report 2010–5033

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