SYNTHESIS OF NUTRIENT AND SEDIMENT DATA

FOR WATERSHEDS WITHIN 

THE CHESAPEAKE BAY DRAINAGE BASIN

by Michael J. Langland, Patricia L. Lietman, and Scott Hoffman

U.S. GEOLOGICAL SURVEY

Water-Resources Investigations Report 95-4233

Prepared in cooperation with the

U.S. ENVIRONMENTAL PROTECTION AGENCY

Lemoyne, Pennsylvania 

1995
U.S. DEPARTMENT OF THE INTERIOR

BRUCE BABBITT, Secretary

U.S. GEOLOGICAL SURVEY

Gordon P. Eaton, Director

For additional information 

write to:

District Chief

U.S. Geological Survey

840 Market Street

Lemoyne, Pennsylvania 17043-1586

Copies of this report may be 

purchased from:

U.S. Geological Survey

Earth Science Information Center

Open-File Reports Section

Box 25286, MS 517

Denver Federal Center

Denver, Colorado 80225
CONTENTS

Page

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

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

Purpose and scope ...................................................... .2

Approach ............................................................ .2

Description of study area ................................................. .2

Data sources .......................................................... .4

Acknowledgments ...................................................... .4

Description of database ....................................................... .6

Water-quality data set ................................................... .6

Hydrologic condition data set.............................................. .6

Load data set ......................................................... .8

Load-estimator model. .............................................. .8

Nutrient and sediment loads .......................................... .9

Geographic Information System data sets ..................................... .9

Site location...................................................... 11

Land use ........................................................ 11

Physiographic provinces ............................................. 15

Rock type ....................................................... 17

Watershed delineations .............................................. 17

Synthesis of nutrient and sediment data and geographic data ............................ 19

Distribution of nutrient and sediment concentrations ............................. 19

Distribution of nutrient and sediment loads .................................... 19

Distribution of nutrient and sediment yields.................................... 23

Distribution of geographic data. ............................................ 35

Identification of spatial and temporal data gaps ................................. 35

Potential applications of database ........................................... 43

Summary and conclusions .................................................... .44

References cited. ............................................................ 46

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names. ... .47

2. Sample supplemental information data sheet. ............................. .73

3. Example output from 7-parameter log-linear regression model used to estimate

nutrient and sediment loads ........................................ 77

4. List of sites and load constituents in the Chesapeake Bay Basin ................. 83

5. Example format of nutrient- and sediment-load database...................... 89

6. Statistical summeries of water-quality concentration data for total nitrogen,

total phosphorus, dissolved nitrate, and suspended sediment for all 127 load

sites grouped by subbasin.......................................... 91

7. Mean annual yields for 13 nutrient and suspended-sediment constituents based

upon hydrologic condition for all 127 load basins. ....................... .99

8. Simple statistics from the correlation analysis using the Kendall tau statistic ....... Ill

9. Station, basin area, and percentage of land use, rock type, and physiographic

province for all 127 load sites ......................................113

10. List of load sites in basin order in the Chesapeake Bay Basin. ................. 119

CONTENTS ~ iii
ILLUSTRATIONS

Page

Figure 1. Map showing the stream network in the six major river basins of the Chesapeake

Bay Basin ........................................................ 3

2. Graphs showing comparisons of sampled daily mean flows and resultant differences 

in estimated annual yields for total nitrate and total phosphorus at Shermans Creek 

near Shermansdale, Pa., with flow-driven and fixed-interval sampling protocols ...... 10

3-7. Maps showing:

3. Locations of 1,058 water-quality sampling sites in the Chesapeake Bay Basin ...... 12

4. Locations of all 127 sites where loads were estimated in the Chesapeake Bay Basin . . 13

5. Distribution of six land-use classifications in the Chesapeake Bay Basin .......... 14

6. Distribution of physiographic provinces and their sections in the Chesapeake

Bay Basin .................................................... 16

7. Distribution of four major rock types in the Chesapeake Bay Basin ............. 18

8. Boxplots showing nutrient and sediment concentrations for 13 major subbasins

for the 127 load sites in the Chesapeake Bay Basin .......................... 20

9-12. Graphs showing:

9. Years for which annual load data are available for total nitrogen, total phosphorus,

and suspended sediment at eight fall line sites in the Chesapeake Bay Basin. ..... 21

10. Relation between annual flow condition and mean annual yields of selected

constituents at 15 sites in the Chesapeake Bay Basin ...................... 24

11. Relation between mean annual yields of total nitrogen and total phosphorus

from normal flow years and percent of specific land use from that basin ........ 26

12. Differences in mean annual yields of total nitrogen from normal flow years as

a function of percentage carbonate rock and percentage agriculture ........... 27

13-15. Maps showing:

13. Locations of all total nitrogen sites and range in annual total nitrogen yields

in the Chesapeake Bay Basin ....................................... 30

14. Locations of all dissolved nitrate sites and range in annual dissolved nitrate

yields in the Chesapeake Bay Basin .................................. 32

15. Locations of all total phosphorus sites and range in annual total phosphorus

yields in the Chesapeake Bay Basin .................................. 31

16. Boxplots showing the relation between mean annual yields of dissolved nitrate in 

base flow and land use, rock type, and combinations of land use and rock type 

in the Chesapeake Bay Basin.......................................... 34

17. Map showing carbonate rock areas and agricultural areas underlain by carbonate

rock in the Chesapeake Bay Basin....................................... 36

18. Graphs showing spatial and temporal distribution of the 127 load sites and years

with an estimated load arranged by the 13 subbasins in downstream order ......... 40

19. Map showing length of annual estimated load record for 48 total nitrogen sites

in the Chesapeake Bay Basin.......................................... 41

20. Map showing length of annual estimated load record for 99 total phosphorus

sites in the Chesapeake Bay Basin ...................................... 42

iv ~ ILLUSTRATIONS
TABLES

Page

Table 1. Type of feature, attribute data, broad definition, projection, and original data

sources used for gis data sets........................................ 5

2. Total number of stations listed by state, multi-agency sites (sites where more

than one agency collected data), water-quality sites, load stations, multi-agency 

load sites (loads computed from data supplied by more than one agency), unique 

load sites, and base-flow load sites .................................... 7

3. Water-quality database format including variable name, type, length, position,

and format. .................................................... 7

4. Geographic Information System data set name, classification, and percentage 

area for the Chesapeake Bay Basin and states of Pennsylvania, Maryland, and 

Virginia ...................................................... 15

5. Mean annual loads and annual yields for high, normal, and low flow water years

for eight major subbasins in the Chesapeake Bay for the period 1972-92 ........ 22

6. Results of KendalPs tau correlation test relating mean annual yields for selected

constituents to selected land uses, rock types, and physiographic provinces ...... 25

7. Comparison of percentage land use, percentage rock type, and mean annual

nutrient yields for predominantly urban and predominantly agricultural basins ... 28

8. Distribution of load basins and mean annual yields for total nitrogen, dissolved 

nitrate, and total phosphorus, by percentage of land use and predominant 

(greater than 50 percent) rock type. .................................. 33

9. Percentage of the total area of the Chesapeake Bay Basin in combination with 

specific land use and physiographic province or rock type and the percentage 

of the specific land use within each physiographic province and rock type ....... 35

TABLES ~ v
CONVERSION FACTORS AND ABBREVIATIONS 

Multiply By To obtain

Flow

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

Mass

pound (Ib) 0.4536 kilogram

pound per acre (Ib/acre) 1.121 kilogram per hectare

pound per day (Ib/d) 0.4536 kilograms per day

Area

acre 0.4047 hectare

square mile (mi2) 2.590 square kilometer

Other Abbreviations

Abbreviated water-quality units used in report:

milligrams per liter (mg/L) 

micrograms per liter ((ig/L) 

micrometers (|im)

vi ~ CONVERSION FACTORS AND ABBREVIATIONS
SYNTHESIS OF NUTRIENT AND SEDIMENT DATA

FOR WATERSHEDS WITHIN 

THE CHESAPEAKE BAY DRAINAGE BASIN

by Michael J. Langland, Patricia L. Lietman, and Scott Hoffman

ABSTRACT

Nutrient and sediment data collected by 

Federal and state agencies from 1972 through 

1992 at 1,058 surface-water sites in nontidal parts 

of the Chesapeake Bay Basin were compiled into 

a large database. Adequate nutrient, sediment, 

and streamflow data were not available to 

compute annual loads for all sites because waterquality monitoring at many of the sites was either 

short term or noncontinuous or because streamflow was not measured. Annual nutrient and sediment loads were calculated at a total of 127 sites. 

Annual loads of dissolved nitrate were calculated 

for 108 sites, but total nitrogen loads could be 

calculated for only 48 of these sites because 

ammonia plus organic nitrogen data were not 

available for many of these 108 sites. Annual 

loads of total phosphorus were calculated for 99 

sites, and annual loads of suspended sediment 

were calculated for 33 sites. Loads could be calculated for only a very few sites in the Juniata River 

Basin (a tributary to the Susquehanna River), the 

York River Basin, the middle and lower reaches 

of the James River, and the nontidal parts of the 

eastern shore of the Bay.

Geographic Information System (GIS) spatial 

data sets of land use, physiographic province, 

rock type, and watershed delineation were 

compiled for the entire Chesapeake Bay Basin 

(approximately 64,000 square miles). The 

nutrient- and sediment-yield data were evaluated 

with respect to land use, physiographic province, 

rock type, and hydrologic characteristics. During 

years that the mean streamflow was about equal 

to the long-term mean streamflow, the Susquehanna River contributed about 50 percent of the 

freshwater, 66 percent of the total nitrogen, and 

40 percent of the total phosphorus transported by 

tributaries to the Bay. Nutrient and sediment 

data were available for less than 18 percent of the 

predominantly agricultural areas underlain by

siliciclastic rock and for less than 35 percent of 

the predominantly agricultural areas underlain by 

either carbonate rock or unconsolidated rock. 

Nutrient and sediment data were available for 

about 91 percent of the predominantly forested 

areas underlain by siliciclastic rock. Spatial and 

temporal gaps in the water-quality data and GIS 

data sets limited some data analysis. Correlations 

of annual yields of nutrients and sediment with 

respect to land use, physiographic province, and 

rock type indicated (1) basins with larger percentages of agricultural land had larger nutrient and 

sediment yields, (2) basins with larger percentages 

of forest land had smaller nutrient and sediment 

loads, (3) the largest total nitrogen yields were 

from agricultural basins underlain by carbonate 

rock, (4) yields of nutrients from urban basins 

were substantially less than yields from agricultural basins, and (5) basins with small amounts of 

agricultural and urban land had relatively small 

nutrient and sediment yields.

INTRODUCTION

The Chesapeake Bay is the largest estuary in 

the United States. Its thriving fisheries industry 

and complex ecosystems are vulnerable to 

changes in water quality. Excessive nutrients and 

sediment entering the Chesapeake Bay from agricultural, urban, and forested nonpoint sources 

within the Bay Basin have been shown to cause 

degradation of both water quality and living 

resources in the Bay. In 1987, with the signing of 

the Chesapeake Bay Agreement, Pennsylvania, 

Maryland, Virginia, and the District of Columbia 

agreed to reduce controllable nutrient loads to the 

Chesapeake Bay by 40 percent by the year 2000. 

Many studies conducted by the U.S. Geological 

Survey (USGS), other Federal and state organizations, utilities, and universities have determined 

concentrations of nutrients and sediment in 

streams draining watersheds throughout the

ABSTRACT ~ 1
SYNTHESIS OF NUTRIENT AND

Chesapeake Bay Basin. A small number of these 

studies have used the concentration data to estimate nutrient and sediment loads; however, the 

concentration and load information has never 

been compiled into a single database or analyzed 

with respect to the primary factors affecting 

nutrient and sediment loading to the Chesapeake 

Bay. Factors such as land use, physiographic 

province, rock type, and hydrologic characteristics vary widely throughout the Chesapeake Bay 

drainage, but more needs to be known about the 

relative importance of these individual factors 

and how they interact synergistically to affect 

water quality. Compilation of nutrient- and sediment-load data and basin characteristics will 

provide water managers with the data needed to 

evaluate existing monitoring networks, estimate 

the effectiveness of water-quality managementstrategies, and determine future monitoring needs.

Purpose and Scope

This report (1) documents the compilation of 

nontidal nutrient and sediment water-quality data 

collected from 1972 through 1992; nutrient- and 

sediment-load and -yield data; spatial Geographic 

Information System (GIS) data sets, including land 

use, physiographic province and rock type; and 

selected supplemental information for the Chesapeake Bay Basin for all available data sources 

that met the minimum requirements (detailed in 

Description of Database on page 6); (2) relates 

nutrient and sediment loads and yields to land 

use, physiographic province, rock type, and 

hydrologic characteristics; (3) identifies spatial 

and temporal deficiencies in nutrient- and sediment-load data collection within the Chesapeake 

Bay Basin; and (4) presents a discussion of potential applications of the database.

Approach

Extensive water-quality, water-discharge, spatial, and supplemental data (station name, latitude and longitude, drainage basin, etc.) were 

compiled into one database. Water-quality data 

were requested from all nontidal monitoring 

programs within the Chesapeake Bay Watershed. 

Hydrologic streamflow data collected by the USGS 

were used to determine and characterize the 

annual quantity of both total flow and base flow 

and to identify annual streamflow according to 

flow condition. By use of an unbiased log-linear 

regression model (Cohn and others, 1989), annual

nutrient and suspended-sediment loads were estimated for total flow and base flow for some sites 

within the Bay Basin. Spatial data sets for land 

use, physiographic province, rock type, and 

watershed delineations were compiled in a GIS for 

the entire Bay Basin. Drainage basins, upstream 

from water-quality sites where loads were estimated, were delineated and characterized by 

percentage land use, physiographic province, rock 

type, and hydrologic condition. Estimated 

nutrient and sediment loads were correlated with 

land use, physiographic province, and rock type 

to identify any linear relations that existed in the 

data. Spatial gaps in the database were evaluated 

with respect to the areal distribution of sites with 

water-quality-load data and the range of spatial 

(GIS) data. Temporal gaps were evaluated with 

respect to minimum requirements for loads 

computations and requirements for trend analysis 

for this and future studies.

Description of Study Area

The Chesapeake Bay is one of the largest and 

most productive estuarine systems in the world. 

The Chesapeake Bay "mainstem," defined by 

tidal zones, is approximately 195 mi long and 3.5 

to 35 mi wide and has a surface area of nearly 

4,400 mi2 . The mainstem is located entirely within 

the states of Maryland and Virginia. Nearly 50 

rivers, with thousands of tributary streams and 

creeks, drain the approximately 64,000 mi2 

forming the Chesapeake Bay Basin. The Bay 

Basin contains more than 150,000 stream miles in 

the District of Columbia and parts of six states: 

New York, Pennsylvania, Maryland, Virginia, 

West Virginia, and Delaware (fig. 1). Six rivers, 

the Susquehanna, Patuxent, Potomac, Rappahannock, York, and James (fig. 1), contribute nearly 

90 percent of the Bay's mean annual freshwater 

inflow of 69,800 ft3/s (U.S. Army Corps of Engineers, 1977). The Susquehanna River, the largest 

river entering the Bay, drains nearly 43 percent of 

the 64,000-mi2 basin and normally contributes 

about 50 percent of the freshwater reaching the 

Bay. Most of the Susquehanna River Basin is in 

Pennsylvania.

The climate in the Chesapeake Bay Basin is 

characterized as humid continental with generally 

moderate temperatures. Precipitation in the Bay 

Basin averaged 44 in/yr at selected National 

Atmospheric and Oceanic Administration (NOAA) 

stations from 1930 to 1961 (U.S. Army Corps of 

Engineers, 1977). However, significant long- and

INTRODUCTION
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

EXPLANATION

	Major Basin

 Susquehanna

IH Potomac

HJ Rappahannock

I I Patuxent

 York

CHI James

 Drainage Network

A Load Site

77°

20 40 60 80 100 MILES

0 20 40 80 80 100 KILOMETERS

Figure 1 . Stream network in the six major river basins of the Chesapeake Bay Basin.

INTRODUCTION ~ 3
SYNTHESIS OF NUTRIENT AND

short-term variations in precipitation occur in the 

Bay Basin primarily because of the large areal 

extent and local influence of thunderstorms. For 

example, in the northern part of the basin, 

average precipitation is about 30 in/yr, while in 

sections of the southern part of the basin, precipitation averages nearly 50 in/yr. Surface runoff 

(precipitation) within the Chesapeake Bay watershed is a significant contributor of nutrient loads 

(Maryland Department of Environment, 1992).

Data Sources

Water-quality and -discharge data were 

requested, retrieved, and compiled from Federal 

and state agencies, universities, and private 

companies or organizations that had collected 

nutrient and sediment data at multiple and single 

land-use sites from nontidal stream reaches within 

the Chesapeake Bay Basin. Databases used as 

sources of nutrient and sediment data include 

U.S. Environmental Protection Agency's (USEPA) 

STORET, USGS'S WATSTORE, and Maryland Department of the Environment's (MDE) VAX system. 

Agencies supplying water-quality data include the 

uses, the Pennsylvania Department of Environmental Protection (PEDEP) [formerly the Pennsylvania Department of Environmental Resources 

(paDER)], MDE, the Virginia Department of Environmental Quality (vaDEQ), the Virginia Surface 

Water Quality Board (VESWCB), the Susquehanna 

River Basin Commission (SRBC), the Occoquan 

Watershed Monitoring Laboratory (OWML) and 

the Occoquan Laboratory (OCCOQ) in Virginia, 

the D.C. Bureau of Air and Water Quality 

(DCBAWQ), Montgomery County in Maryland 

(MONTCO), Prince George County Health Department in Maryland (PGHD), Fairfax County 

(FAIRFAX) and Fairfax County Water Authority 

(FCWA) in Virginia, and the Loudoun County 

Sanitation Authority in Virginia. All waterquality data from PaDEP and VaDEQ were retrieved 

from STORET. The majority of the samples 

contained in the water-quality database were 

collected as part of three Federal and state 

programs: River Input (Fall Line) Nutrient 

Monitoring, CORE and TREND Monitoring, and 

Ambient Water-Quality Monitoring. All continuous streamflow records were retrieved from the 

uses ADAPS database.

GIS spatial data sets of land use, physiographic province, rock type, watershed delineations, and site classification were obtained from 

Federal or state agencies and compiled or developed for the entire Chesapeake Bay Basin. All 

data sets, feature types, attribute data, resolution, 

and original sources are summarized in table 1. 

Specific descriptive information is contained in 

the documentation for each GIS data set.

Acknowledgments

The authors wish to acknowledge and thank 

the following agencies and individuals for their 

time and contribution to the project:

Chesapeake Research Consortium

Greg Grover 

Kara Kaufman 

Mark Johnson 

Renee Steigman

D.C. Department of Air and Water Quality

Clifford Jarmon

Maryland Department of the Environment

Sally Bowen 

Sherm Garrision

Metropolitan Washington Council of 

Governments

Brian Hazelwood 

Peter Legg

Occoquan Laboratory

Adil Godrej 

Thomas Grizzard

Pennsylvania Department of Environmental 

Protection

Rick Shertzer 

Tammy Shreffler

Susquehanna River Basin Commission

Bob Edwards 

Charlie Takita

U.S. Environmental Protection Agency

Joyce Boyd

Virginia Department of Environmental Quality

Charlie Morgan 

Vera Polluck

U.S. Geological Survey

Jim Bisese 

Diana Dugas 

Don Hayes 

Cherie Miller

4 - INTRODUCTION
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Table 1. Type of feature, attribute data, broad definition, projection, and original 

data sources used for GIS data sets

[UTM, Universal Tranverse Mercator; USEPA, U.S. Environmental Protection 

Agency; USGS, U.S. Geological Survey; N/A; not applicable]

Data set Feature 

type Attribute data Broad definition Projection (scale in meters)

Original 

source

Land use

Physiographic 

province

'Rock type

Watershed 

delineation

Grid Woody

Herbaceous 

High intensity urban 

Low intensity urban 

Herbaceous urban 

Woody urban 

Exposed

Water

Polygon Appalachian Plateau

Appalachian Mountain 

Great Valley Section 

Blue Ridge

Reading Prong Section 

Mesozoic Lowlands Section 

Piedmont Lowlands Section 

Piedmont Uplands Section 

Coastal Plain

Polygon Carbonate 

Siliciclastic 

Crystalline 

Unconsolidated

Forest

Agricultural

Urban

Suburban

Residential

Residential

Disturbed land cleared of vegetation

exposing rock or sand 

Rivers, lakes, streams, etc.

UTM18 (1:100,000) USEPA

UTM 18 (1:500,000) USGS

Line

Site location Point

Load basins 

Other basins

Bay 1 

Bay 2 

Bay 3

Limestone, dolomite 

Sandstone, shales, siltstone 

Granite, schist, quartzite, gneiss 

Sand, gravel, clay

N/A

Nonload sites

Nonioad sites greater than 50 samples 

Load sites, greater than 50 samples, 

and continuous streamflow

UTM18 (1:500,000) USGS

UTM18 (1:24,000) USGS 

UTM 18 (1:250,000)

N/A USGS

INTRODUCTION ~ 5
SYNTHESIS OF NUTRIENT AND

DESCRIPTION OF DATABASE

The following sections of this report document the criteria used for selection of waterquality data to include in the database, describe 

the databases compiled for this project, discuss 

the regression model used to estimate nutrient 

and sediment loads, and describe the GIS data 

sets.

Water-Quality Data Set

A water-quality database was constructed for 

nontidal sampling sites where major forms of 

nitrogen, phosphorus, and sediment concentrations, dissolved oxygen, and phytoplankton were 

sampled. The selection of water-quality data from 

nontidal sites for inclusion in the database was 

based on the following minimum criteria 1 :

 Nutrient- and sediment-concentration data 

collected between October 1, 1971, through 

September 30, 1992.

 A minimum of 12 nutrient- or sedimentconcentration samples representing fall, 

winter, spring, and summer conditions 

collected throughout any consecutive 3-year 

time span.

 Nutrient- and sediment-concentration data 

available in digital format.

The water-quality database contains the 

results from 129,990 water-quality samples from 

1,154 surface-water sites within the Chesapeake 

Bay Basin. If available, instantaneous discharge, 

the stream discharge at the time of sampling, was 

retrieved and associated with each individual 

water-quality sample. Remark codes, pertaining 

to specific sample qualifiers, are stored with the 

water-quality sample data. The Statistical Analysis System (SAS) (SAS Institute, Inc., 1990), a 

statistical data analysis computer package, was 

used to detect and identify suspect dates, times, 

and water-quality data. The number of waterquality sites sampled in each of the five states is 

listed in table 2. Virginia contains the greatest 

number of water-quality sites (table 2). The 

water-quality database is presently stored in a SAS 

data set at the Chesapeake Bay Program Office,

1 Minimum criteria were established because the original data 

retrieval from STORET contained thousands of additional site locations 

for which only 1 or 2 samples were collected. These samples did not 

represent programs designed to continuously monitor water quality 

but represented short-term point source sampling or synoptic 

sampling programs.

Annapolis, Md. The database format and list of 

constituents are presented in table 3. A complete 

list of the 1,154 stations numbers, locations, and 

names contained in the water-quality database is 

provided in appendix 1. Water-quality data were 

collected by more than one agency at 96 sites 

within the Bay Basin; therefore, water-quality and 

streamflow data were collected at 1,058 unique 

locations. Further references in this report to the 

water-quality sites will refer to the 1,058 unique 

site locations (table 2).

Supplemental program and site-information 

data, including quality assurance and quality 

control, analyzing and sample-collection agencies, 

and sample-collection protocols, are available in 

letter form for all 1,154 stations from which 

water-quality data were compiled and stored in 

the database. A sample supplemental information 

sheet used to collect the data is shown in 

appendix 2.

Hydrologic Condition Data Set

Fluctuations in annual streamflow, primarily 

caused by climatic variability, directly influence 

annual nutrient and sediment concentrations and 

loads. These fluctuations may mask changes in 

water quality caused by changes in factors such as 

land use or implementation of agricultural bestmanagement practices. Because the load is calculated as the product of a concentration and a 

discharge, annual fluctuations in streamflow will 

have a major effect on resulting loads. In an 

attempt to minimize this effect in data analysis 

and interpretation, annual variations in hydrologic conditions were accounted for by characterizing annual mean streamflows as high, normal, 

or low on the basis of water-discharge ratios. 

Ratios were determined by dividing the annualmean discharge by the long-term mean discharge 

of the sampled stream at stations with 5 or more 

years of continuous water-discharge record. 

Normal flow was defined as within 10 percent of 

the long-term mean. For example, waterdischarge ratios less than 0.90 are low flow, ratios 

between 0.90 and 1.10 are normal flow, and ratios 

greater than 1.10 are high flow. Normalization of 

annual mean streamflows by use of the waterdischarge ratios allowed the analysis of nutrient 

and sediment loads and yields with similar 

streamflow conditions with respect to land use, 

physiographic province, and rock type.

6 ~ DESCRIPTION OF DATABASE
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Table 2. Total number of stations listed by state, multi-agency sites (sites where more than one agency collected 

data), water-quality sites, load stations, multi-agency load sites (loads computed from data supplied by more than 

one agency), unique load sites, and base-flow load sites

State

New York

Pennsylvania

Maryland

West Virginia

Virginia

Total

Total 

number of 

stations

19

246

375

14

500

1,154

Number of 

multi-agency 

sites

0

48

21

0

27

96

Number of 

unique waterquality sites

19

198

354

14

473

1,058

Total 

number of 

load stations

5

73

43

1

34

154

Number of 

multi-agency 

load sites

1

17

5

0

4

27

Number of 

unique 

load sites

4

54

38

1

30

127

Number of 

base flow 

load sites

4

48

29

0

11

92

Table 3. Water-quality database format including variable name, type, length, 

position, and format

[ft3/s, cubic foot per second; CD, remark code; P, parameter code; N, nitrogen;

mg/L, milligram per liter; P, phosphorus; °C, degrees Celsius; |ig/L, microgram per liter]

Data type

Agency code

Station number

Hydrologic unit code

Latitude

Longitude

Station name

Date

Time

Instantaneous flow, ft3/s

Total nitrogen as N, mg/L

Total ammonia as N, mg/L

Dissolved ammonia as N, mg/L

Total Kjeldahl nitrogen as N, mg/L

Dissolved Kjeldahl nitrogen as N, mg/L

'Total nitrite + nitrate as N, mg/L

Dissolved nitrite + nitrate as N, mg/L

Total phosphorus as P, mg/L

;' ' '- < 

Dissolved phosphorus as P, mg/L

Dissolved orthophosphate as P, mg/L

Suspended sediment, mg/L

Suspended solids at 105 °C, mg/L ; ~ - r -

Total nitrate as N, mg/L

Dissolved nitrate as Ns mg/L

Total nitrite as N, mg/L

Dissolved nitrite as N, mg/L

Dissolved oxygen, mg/L

Chlorophyll a, u,g/L

i

Variable name

AGENCY

STAID

HUC

LAT

LONG

SNAME

DATE

TIME

CD61

P00061

CD600

P00600

CD610

P00610

CD608

P00608

CD625

P00625

CD623

P00623

CD630

P00630

CD631

P00631

CD665

P00665

CD666

P00666

CD671

P00671

CD80154

P80154

CD530

P00530

CD620

P00620

CD618

P00618

CD615

P00615

CD613

P00613

CD300

P00300

CD322H

P32211

Variable type

Character

Character

Character

Character

Character

Character

Character

Character

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Character

Number

Length

8

15

8

6

7

48

6

4

1

8

1

8

1

8

1

8

1

8

1

8

I

8

1

8

1

8

1

8

1

8

1

8

1

8

1

8

1

8

1

8

1

8

1

8

I

8

Position

0

8

23

31

37

44

92

98

102

103

111

112

120

121

129

130

138

139

147

148

156

157

165

166

174

175

183

184

192

193

201

202

210

211

219

220

228

229

237

238

246

247

255

256

264

265

Format

8

15

8

6

7

48

6

4

1

1

1

1

1

1

I

1

i

i

i

i

i

i

i

i

i

i

i

DESCRIPTION OF DATABASE ~ 7
SYNTHESIS OF NUTRIENT AND

Load Data Set 

Load-Estimator Model

Annual nutrient and suspended-sediment 

loads (tons per year) in stormflow and base flow 

were computed by a 7-parameter log-linear 

multiple regression model and stored in both GIS 

and SAS databases. This model, developed by 

Cohn and others (1989) to describe nutrient and 

sediment loads, was validated by Cohn and 

others (1992) with repeated split-sample studies. 

This model was developed and used at 9 monitoring stations for the Chesapeake Bay RiverInput (Fall Line) Nutrient Monitoring Program 

(Maryland Department of Environment, 1992) 

and at 14 stations in the Susquehanna River 

Basin (L.A. Reed, U.S. Geological Survey, 

written commun., 1995). The model requires two 

input ASCII files, both in fixed formats, in order to 

calculate a load for a given constituent. The first 

file contains the water-quality data (format shown 

in table 3), and the second file contains the 

continuous daily-mean water-discharge data retrieved from uses ADAPS databases. The model is 

a multiple regression equation of the form

ln[C] = p^+p^n 

+ P3 [7--f] +p4 [ 

+ pg cos [2nT] +e

+p2 {ln[Q/Q]} 2 

+ p sin[27rT]

where In is the natural logarithm function;

C is measured concentration, in 

milligrams per liter;

O is measured discharge, in cubic feet per 

second;

T is time, measured in decimal years;

O and T are centering variables for discharge and 

time;

p are parameters estimated by ordinary 

least squares; and

e is combined independent random error, 

assumed to be normally distributed 

with zero mean and variance a2 .

Loads were then calculated with the following 

equation:

where Lj is calculated load over time interval 7

for constituent / ;

Cj t is predicted concentration of constituent 

/ for day t, in milligrams per liter 

(calculated by the model); and

Of is measured mean daily discharge for 

day t, in cubic feet per second;

K is conversion factor

< > r> 1 r, s x L x ton 2.699 x 10" , 

, where s is

ft3 x mg x d

seconds, L is liters, ton is tons, ft3 is 

cubic feet, mg is milligrams, and d is 

days.

(The model usually reports estimated loads in 

kilograms per day; for this study, the K listed 

above converts kilograms per day to tons per 

day.)

Annual nutrient and sediment loads are 

calculated for the period October 1 through 

September 30, the uses water year. An example 

of the model output is shown in appendix 3. 

Regression diagnostics and residual plots were 

used to determine the validity of the regression 

model, identify outliers in the water-quality 

sample data, and detect serial correlation and 

seasonality. If regression diagnostics indicated 

poor relations between concentration and model 

variables resulting in high model errors, one 

attempt was made to eliminate extreme outliers 

and rerun the model. If regression diagnostics still 

indicated a poor relation, model results were not 

reported.

Annual loads were computed on the 

following 13 nutrient and sediment constituents. 

Numerical codes are identifiers for each constituent in the databases:

 total nitrogen (00600)

 total and dissolved ammonia (00610, 00608)

 total and dissolved nitrate (00620, 00618)

 total and dissolved ammonia plus organic 

nitrogen (00625, 00623)

 total and dissolved nitrite plus nitrate (00630, 

00631)

 total and dissolved phosphorus (00665, 

00666)

 dissolved orthophosphorus (00671)

 suspended sediment (80154)

8 ~ DESCRIPTION OF DATABASE
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

On the basis of analytical procedures, 

samples analyzed for total ammonia, total nitrate, 

and total nitrite plus nitrate at the uses National 

Water Quality Laboratory were considered to be 

dissolved, regardless of how they were reported in 

the database.

Nutrient and Sediment Loads

At most sites, water-quality samples were 

collected on the basis of one of two different 

sampling programs: flow-driven or fixed-interval 

sampling. In flow-driven (or total-streamflow) 

sampling programs, samples are collected on the 

basis of streamflow conditions. This sampling 

protocol generally results in frequent sampling 

over a wide range of streamflows but with an 

emphasis on stormflow, producing a well-defined 

relation between concentration and streamflow. 

Fixed-interval (fixed) sampling programs collect 

samples on a regular schedule, usually monthly or 

quarterly. Samples collected at fixed intervals may 

not represent the entire range of streamflow and 

have been shown to underestimate the constituent 

load, particularly if the sampling misses high-flow 

events. Because of financial and personnel considerations, more frequent and representative 

streamflow sampling is not always possible at 

many sites. The effects of the flow-driven and 

fixed-interval sampling strategies on loads were 

examined at several sites with multiple-agency 

sample collection. Figure 2 illustrates typical 

differences in the number of samples collected 

over the range of flows and the resultant differences in annual loads for total nitrate and total 

phosphorus from both fixed-interval and flowdriven sampling at the same site. Flow-driven 

collection strategies almost always resulted in 

higher estimated nutrient and sediment loads at 

the 27 sites where data were collected by more 

than one agency. Therefore, loads were classified 

on the basis of sampled streamflow conditions 

and type of sampling program. Sites where 

sampling conditions were representative of flowdriven were characterized as total load, and sites 

sampled at fixed-time intervals (most state 

programs) were characterized as fixed load.

Adequate data were available to estimate 

nutrient and suspended-sediment loads at 127 

nontidal stream sites within the Chesapeake Bay 

Basin for at least 1 to a maximum of 13 individual water-quality constituents at each site. The 

127 nontidal stream sites represent basins designated by the downstream station number nearest

the mouth of the basin. The number of load sites 

are listed, by state, in table 2. Pennsylvania 

contains the greatest number of load sites, primarily because of the 48 PaDEP water-quality sites 

located at or near uses streamflow-gaging 

stations (Pennsylvania Department of Environmental Resources, 1991).

Base-flow loads, which result primarily from 

ground-water inputs to streams, were calculated 

for dissolved nitrate at 92 of the load sites. 

Ground water is a significant source of nitrate to 

rivers, and base-flow loads can be a significant 

part of the total-nitrogen load. Streamflow 

hydrographs were separated into two components, surface runoff (stormflow) and base flow, 

by use of the local minima streamflow separation 

technique as described by Pettyjohn and Henning 

(1979). For this study, 30 percent was added to 

the base flow and subtracted from total flow, and 

if the difference was greater than zero, that day 

was considered to be a non-base-flow day. For 

calculation of base-flow loads, the water-quality 

files were purged of data from non-base-flow days 

and used as input to the load-estimator model.

A complete list of the 127 load sites, the 

corresponding flow sites, the 92 base-flow sites, 

and a matrix corresponding to the estimated load 

constituents is presented in appendix 4. A total of 

8,020 individual annual loads corresponding to 

the 13 constituents were estimated for 127 load 

sites. An additional 978 individual annual baseflow loads of dissolved nitrate were estimated 

from 92 sites. Less than 1 percent of the estimated annual loads were considered invalid 

because of high model error and were not 

included in the load database. An example of the 

nutrient- and sediment-load database is included 

in appendix 5.

Geographic Information System 

Data Sets

GIS data sets of site classification (load or 

nonload), land use, physiographic province, rock 

type, and watershed delineations were obtained, 

compiled, or developed for the entire Chesapeake 

Bay Basin. Each separate data set is discussed in 

this section. Land use, physiographic province, 

and rock type exert major controls on loads by 

influencing the sources of and transport of nutrients and sediments. Applications of manure and 

commercial fertilizers to agricultural and urban 

lands and the tillage and cultivation of agriculDESCRIPTION OF DATABASE ~ 9
SYNTHESIS OF NUTRIENT AND

FLOW-DRIVEN 

SAMPLES

FIXED-INTERVAL 

SAMPLES

800

<2DQQD COO O OG8D

X XX X XX

700 1,400 2,100 2,800 3,500 

DAILY MEAN FLOW, IN CUBIC FEET PER SECOND

4,200

1984 1985 1986 1987 1988 1989 1990 1991 1992 

WATER YEAR

Figure 2. Comparisons of sampled daily mean flows and resultant differences in 

estimated annual yields for total nitrate and total phosphorus at Shermans Creek 

near Shermansdale, Pa., with flow-driven and fixed-interval sampling protocols.

10 ~ DESCRIPTION OF DATABASE
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

tural soils provide large sources of nutrients and 

sediments. Private septic systems and atmospheric 

deposition also may provide a substantial, 

nonpoint source of nitrogen in the form of 

soluble nitrate or nitrite. Nutrient transport from 

the watershed to the Chesapeake Bay or its tributaries occurs through direct surface runoff or 

infiltration to ground water that is ultimately 

discharged to surface water. Varying physiographic controls, such as elevation and surface 

slopes, affect climate, types of vegetation, and 

amount of ground cover, thereby affecting 

nutrient pathways and the transport rate (Williams and Reed, 1972). Bedrock chemistry, 

bedrock configuration, and hydrologic characteristics can affect amounts and rates of nutrient 

transport to the ground-water system. Soils 

derived from the bedrock have specific characteristics, such as permeability, percentage organic 

content, and cation exchange capacity, that also 

affect nutrient transport. As an example of the 

synergistic effects associated with nutrient transport, some intensively farmed, carbonate areas in 

the Piedmont Physiographic Province contain 

large sources of nutrients from manure and 

commercial fertilizer and have rapid water infiltration because of highly porous and weathered 

limestone. Nitrate contamination of ground water 

is widespread in these areas (Fishel and others, 

1992; Lietman and others, 1983; L.A. Reed, U.S. 

Geological Survey, written commun., 1995).

Site Location

The location of each of the 1,058 unique 

water-quality stations was plotted on a map of 

the Chesapeake Bay drainage, and the area was 

divided into 13 subbasins. Most of the subbasins 

are parts of large tributaries to the Bay; the 

Susquehanna River Basin was divided into four 

subbasins, and the Potomac River Basin was 

subdivided into three subbasins. The Choptank, 

Patuxent, Rappahannock, York, and James River 

Basins were not subdivided. An area that 

contains many small tributaries and drains to the 

northwestern part of the Bay was identified as the 

Western Shore. Areas that drain to the eastern 

side of the Bay, except for the Choptank River 

Basin, and small areas that drain to the western 

side of the Bay were not included in any of the 

subbasins. The 13 subbasins are included on each 

Bay Basin illustration. The locations of all 1,058 

sites in the water-quality database were classified

as nonload sites (designated as Bay 1 and 2) or 

load sites (designated as Bay 3) according to the 

following requirements:

 Bay 1- All 1,058 sites with at least 12 nutrient 

or sediment samples collected over at least 3 

years, regardless of the availability of 

continuous streamflow data. All 1,058 sites 

are shown in figure 3.

 Bay 2 - A subset of Bay 1 with 613 sites 

containing at least 50 nutrient or sediment 

samples collected over at least 3 years, 

regardless of the availability of continuous 

streamflow data.2

 Bay 3 - A subset of Bay 2 containing the 

locations of the 127 load sites with at least 50 

nutrient or sediment samples and continuous 

streamflow record of at least 3 years. If 

water-quality data were collected within 1,500 

yards of a continuous streamflow station, 

both sites were examined on topographic 

maps to determine if the streamflow data 

were suitable to estimate loads for the waterquality site. All 127 load sites are shown in 

fig-4.

Land Use

The Environmental Monitoring and Assessment Program (EMAP) data set for land use was 

obtained from the USEPA for inclusion in the database (table 1). Approximately 54 percent of the 

Bay Basin is forested (table 4). The majority of 

the forested (woody) areas are in the northern 

and western parts of the Bay Basin (fig. 5). 

Approximately 63 percent of Pennsylvania is forest. Agricultural (herbaceous) areas comprise 

about 30 percent of the entire Chesapeake Bay 

Basin with about the same percentage of land 

classified as agricultural in Pennsylvania, Maryland, and Virginia. The majority of the land used 

for agriculture in the Bay Basin is located in three 

distinct areas: (1) the valleys running generally 

southwest to northeast, (2) the fertile soils in the 

Lower Susquehanna River Basin, and (3) the 

eastern shore area of Maryland. The most urbanized areas of the basin are in the "corridor"

2 Many sites, especially those in ambient monitoring networks, are 

sampled on a monthly basis. After 3 years, this would result in about 

36 samples less than the 50 required by this study for model 

calibration. These stations were included in Bay 2 and Bay 3 if 

sampling over a longer period of time resulted in the minimum number 

of samples. For example, stations sampled for 4 or more years usually 

contained 50 or more samples, and, if possible, annual loads were 

computed.

DESCRIPTION OF DATABASE ~ 11
SYNTHESIS OF NUTRIENT AND

EXPLANATION

	Subbasin

HI Upper Susquehanna

HI West Branch Susquehanna

HI Juniata

HI Lower Susquehanna

 Choptank

EH Patuxent

^H Western Shore

EH Upper Potomac

HI Lower Potomac

HI Shenandoah

HI Rappahannock

HI York

HI James

* Water-quality sampling site

20 40 60 80 100MILES

0 20 40 60 80 100KILOMETERS

Figure 3. Locations of 1,058 water-quality sampling sites in the Chesapeake Bay Basin.

12 ~ DESCRIPTION OF DATABASE
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

EXPLANATION

	Subbasin

^1 Upper Susquehanna

 West Branch Susquehanna

 Juniata

 Lower Susquehanna

 Choptank

CH Patuxent

 Western Shore

d] Upper Potomac

 Lower Potomac

 Shenandoah

^1 Rappahannock

 York

^1 James

» Load Site

yy.

^/ V ' S ' MAF

/X .-^WEST VIRGINIA,' N \, < * - ^

;

/ 

^V

0 20 40 60 80 100 MILES 

0 20 40 60 80 100 KILOMETERS

VIRGINIA

Figure 4. Locations of all 127 sites where loads were estimated in the Chesapeake Bay Basin.

DESCRIPTION OF DATABASE ~ 13
SYNTHESIS OF NUTRIENT AND

EXPLANATION

Land Use / Land Cover

^1 Urban

H Herbaceous

 Woody

 Exposed

 Water

d Herbaceous Wetland

T

0 20 40 60 80 100 MILES I -^-i , i i H ' 

0 20 40 60 80 100 KILOMETERS

Figure 1. Distribution of six land-use classifications in the Chesapeake Bay Basin.

14 ~ DESCRIPTION OF DATABASE
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Table 4. Geographic Information System data set name, classification, and percentage area 

for the Chesapeake Bay Basin and states of Pennsylvania, Maryland, and Virginia

[<, less than]

Geographic 

Information 

System data set

Land use (percent)

Physiographic Province 

(percent)

Rock Type (percent)

Water (percent)

Total (square miles)

Classification

Woody (forest)

Herbaceous (agriculture)

High Intensity Urban (urban)

Low Intensity Urban (urban)

Woody Urban (urban)

Herbaceous Urban (urban)

Water

Exposed

Herbaceous Wetland

Appalachian Plateau 

Ridge and Valley

Appalachian Mountain Section

Great Valley Section

Blue Ridge

New England

Reading Prong Section

Piedmont

Mesozoic Lowlands Section

Piedmont Lowlands Section

Piedmont Upland Section

Coastal Plain

Carbonate

Siliciclastic

Crystalline

Unconsolidated

Water

Chesapeake Bay Basin

Percent 

of Bay 

Basin

53.8

30.6

.6

4.0

1.1

1.6

7.2

.3

.8

100

23.5

24.2

7.6

4.4

<.l

4.2

1.8

16.6

17.7

100

12.0

48.9

20.4

18.7

100

6.6

64,742

Percent of Bay Basin in:

Pennsylvania

62.5

31.1

.3

2.9

.6

.8

11.1

.7

0

100

39.4

41.9

6.0

1.3

<.l

4.1

2.8

4.4

0

100

10.2

83.4

6.4

0

100

<.l

22,621

Maryland

32.6

31.3

1.2

6.4

1.9

2.7

20.8

.2

2.9

100

5.8

6.7

5.4

4.9

0

5.4

0

23.9

47.9

100

8.9

14.1

26.6

50.4

100

20.2

11,573

Virginia

52.4

28.3

.6

4.5

1.4

2.3

9.6

.1

.8

100

0

14.7

12.4

9.5

0

6.3

0

32.2

24.9

100

14.7

19.9

39.6

25.8

100

9.1

23,906

between Baltimore, Md., and Washington, D.C. 

(fig. 5). Approximately 4.6 percent of the basin is 

considered urban (high- and low-intensity urban); 

the highest percentage by state is in Maryland 

(7.6 percent). Water bodies, including the 

Chesapeake Bay, major rivers, and hundreds of 

tributaries, occupy about 7.2 percent of the basin. 

Approximately 20 percent of Maryland is 

classified as water.

Physiographic Provinces

Six major physiographic provinces have been 

identified in the Chesapeake Bay Basin the 

Appalachian Plateau, Ridge and Valley, Blue

Ridge, New England (Reading Prong Section 

only), Piedmont, and Coastal Plain Physiographic 

Provinces (fig. 6). Additionally, two physiographic provinces (Ridge and Valley and Piedmont) were subdivided into sections (table 4). The 

Appalachian Plateau Physiographic Province, the 

western-most province, occupies about 24 percent 

of the entire Bay Basin. This province is dominated by moderately warped and tilted layers of 

sandstone and shale producing rugged, hilly areas 

with intricately dissected plateaus and broad 

ridges (U.S. Geological Survey, 1984). The Ridge 

and Valley Physiographic Province, containing 

the Appalachian Mountain and Great Valley 

Sections, is to the east, contiguous to the AppalaDESCRIPTION OF DATABASE ~ 15
SYNTHESIS OF NUTRIENT AND

EXPLANATION

Physiographic Province and Section

^| Appalachian Plateau Province

 

Appalachian Mountain Section 

of Ridge and Valley Province

 

Great Valley Section 

of Ridge and Valley Province

^1 Blue Ridge Province

77-

NEW YORK

 

Reading Prong Section 

of New England Province

H

Mespzoic Lowlands Section 

of Piedmont Province

 

Piedmont Lowland Section 

of Piedmont Province

D Piedmont Upland Section 

of Piedmont Province

^| Coastal Plain Province 

A Load Site

PENNSYLVANIA

4VA A A A IEA ** ,^E_

rjt

lx*\^f A^

0 20 40 60 80 100 MILES 

0 20 40 60 80 100 KILOMETERS

Figure 6. Distribution of physiographic provinces and their sections in the Chesapeake Bay Basin.

16 - DESCRIPTION OF DATABASE
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

chian Plateau, and occupies about 32 percent of 

the basin. The Appalachian Mountain Section 

consists primarily of sedimentary rocks, with 

resistant layers forming long narrow ridges separated by long valleys generally underlain by limestone and shale (Berg and others, 1989). The 

Great Valley Section is a broad, moderatel> 

dissected valley with shale and sandstone on the 

western side and limestone and dolomite in the 

center and on the eastern side. Approximately 

48 percent of Pennsylvania is in the Appalachian 

Mountain and Great Valley Sections.

The Blue Ridge Physiographic Province, 

consisting of complexly folded and faulted metamorphic and metavolcanic rocks, lies between the 

Piedmont and the Ridge and Valley Provinces 

and occupies less than 5 percent of the basin. 

Approximately 82 percent of the Blue Ridge 

Physiographic Province is located in Virginia. The 

Reading Prong Section of the New England Province is located completely in Pennsylvania and 

comprises less than 1 percent of the Bay Basin. 

The fifth physiographic province, the Piedmont, 

borders the western edge of the Coastal Plain and 

comprises about 23 percent of the Bay Basin. The 

Piedmont is divided into three sections Mesozoic Lowlands, Piedmont Lowlands, and Piedmont Uplands because of distinct differences in 

topography and rock type. Topography includes 

rolling lowlands with isolated highlands in the 

Mesozoic Lowlands, broad valleys separated by 

broad low hills in the Piedmont Lowlands, and 

broad, gently-rolling hills and valleys in the Piedmont Uplands (Berg and others, 1989). The Piedmont Lowlands Section, located completely in the 

Lower Susquehanna River Basin, contains some 

of the most nutrient-rich soils and intensively 

farmed land in the country. The Coastal Plain 

Physiographic Province is the eastern most province and borders the Chesapeake Bay. The 

Coastal Plain comprises about 18 percent of the 

Bay Basin and is located completely in Maryland, 

Virginia, and Delaware. The Coastal Plain 

consists of gently dipping, unconsolidated layers 

of gravel, sand, and clay underlying fiat lowlands.

clastic rocks, and unconsolidated sediments 

(fig. 7). Carbonate rocks consist primarily of 

limestone, dolomite, and marble and occupy large 

areas of the Great Valley and Piedmont 

Lowlands. Approximately 12 percent of the Bay 

Basin is underlain by carbonate rock (table 4); 

45 percent of that area is located in Virginia. 

About 50 percent of the Bay Basin is underlain 

by siliciclastic rock. Silicidastic rocks include 

sandstone, siltstone, shale, and conglomerates. 

About 84 percent of Pennsylvania is classified as 

siliciclastic rock, and the majority of the siliciclastic rock in the Bay Basin (60 percent) is 

located in Pennsylvania. The majority of the crystalline rock is schist, granite, quartzite, and 

gneiss, and it comprises approximately 20 percent 

of the Bay Basin; the majority (40 percent) is 

located in Virginia. Unconsolidated sediments 

underlie about 19 percent of the Bay Basin and 

include sands, gravels, and clays. Unconsolidated 

rock underlies about 50 percent of Maryland and 

comprises about 48 percent of the Bay Basin.

Watershed Delineations

The boundaries of watersheds, upstream of 

the uses streamflow-gaging stations, were delineated for all 127 basins having load estimations. 

All 127 load basins were delineated to the streamflow-gaging site at a scale of 1:24,000.

Rock Type

A GIS data set called "jrock type" was

compiled on the basis of bedrock geology. The 

rocks in the Bay Basin can be grouped into four 

broad "rock types" on the basis of similar lithologic and geologic characteristics. These four rock 

types are carbonate rocks, crystalline rocks, siliciDESCRIPTION OF DATABASE ~ 17
SYNTHESIS OF NUTRIENT AND

EXPLANATION

Rock Type

 Carbonate

H Siliciclastic

CH Crystalline

CH Unconsolidated

A Load Site

NEW YORK

77°

PENNSYLVANIA 

*

J

('

?

41°

20 40 60 80 100 MILES

0 20 40 80 80 100 KILOMETERS 

Figure 7. Distribution of four major rock types in the Chesapeake Bay Basin.

18 - DESCRIPTION OF DATABASE
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

SYNTHESIS OF NUTRIENT

AND SEDIMENT DATA 

AND GEOGRAPHIC DATA

Ranges and means of data from nutrient and 

suspended-sediment samples collected from nontidal streams in the Chesapeake Bay drainage 

basin are reported in the following sections of the 

report. Ranges in calculated yields of nutrients 

and suspended sediment also are discussed, and 

the yields are related to land use, physiographic 

province, and rock type.

Water-quality-concentration data were collected for 18 constituents at 1,058 nontidal sites in 

the Chesapeake Bay Basin (table 3). While data 

synthesis was performed on 14 nutrient and sediment constituents, this report focuses on the 

major forms of nitrogen (total nitrogen and 

dissolved nitrate nitrogen), total phosphorus, and 

suspended sediments. Additional data analysis on 

the remaining constituents are presented in 

appendixes included in the report.

Distribution of Nutrient 

and Sediment Concentrations

A summary of concentration data for total 

nitrogen, total phosphorus, dissolved nitrate, and 

suspended sediment for all 127 load sites is 

presented in appendix 6. The distribution of 

concentrations measured in samples collected 

within each of the 13 major subbasins of the 

Chesapeake Bay drainage is shown on figure 8. 

The greatest range and largest maximum concentrations of total nitrogen, dissolved nitrate, total 

phosphorus, and suspended sediment were in 

samples collected from streams within the lower 

Susquehanna River subbasin. In addition, the 

largest median concentrations of total nitrogen 

(4.2 mg/L) and total phosphorus (0.23 mg/L) 

were in samples collected from tributaries within 

the lower Susquehanna River subbasin. The 

largest median concentration of dissolved nitrate 

(1.9 mg/L) was in streams sampled in the Western 

Shore subbasin. The largest median concentration 

of suspended sediment (124 mg/L) was in samples 

collected from tributaries in the upper Potomac 

River subbasin.

The largest concentrations of total nitrogen 

and total phosphorus were generally in samples 

collected from smaller streams draining areas 

where agriculture is the predominant land use. In 

many of these basins, farming practices are so 

intensive that the recommended maximum

number of animal units (AU) per acre is generally 

exceeded (one animal unit is equal to 1,000 Ib of 

animal, regardless of type). The U.S. Department 

of Agriculture (1982) recommended 1.5 AU/acre in 

a plan developed for the Conestoga River watershed, an intensively farmed area in the Piedmont 

Physiographic Province that is underlain by 

carbonate rocks. Preliminary findings of Correll 

and others (1993) also indicate higher concentrations of total nitrogen and nitrate in the Piedmont Province. Conversely, the York River 

subbasin (fig. 1), which is predominantly forested 

(greater than 70 percent), has the smallest median 

concentrations for all four constituents.

Distribution of Nutrient 

and Sediment Loads

The most downstream site from each of eight 

major (fall line3) river basins was selected to 

examine the total nutrient and sediment loads 

delivered to the Bay. The major rivers are the 

Susquehanna, Patuxent, Potomac,' Rappahannock, York, and James (fig. 1), which contribute 

almost 90 percent of the freshwater to the Bay. 

Additionally, the Choptank River Basin (fig. 4) 

represents the only fall line load basin located on 

the eastern shore of the Chesapeake Bay. The 

York River Basin is represented by two fall line 

sites: one on the Pamunkey River and one on the 

Mattaponi River. Loading information is available at these stations from 1990 to 1992. Prior to 

1990, annual loads were not calculated for some 

years at all eight fall line sites (fig. 9). Rather than 

totaling loads by year, mean annual loads to the 

Bay were totaled on the basis of hydrologic 

condition. Estimated loads for the period 1972-92 

were used to compute the average load in high, 

normal, and low flow years, thereby approximating total nitrogen and total phosphorus loads 

to the Bay (table 5). The mean annual loads for 

high, normal, and low flow years (table 5) indicate the Susquehanna River Basin, which 

discharges about 50 percent of the freshwater to 

the Bay, delivers substantially larger nutrient 

loads than the other major basins, regardless of 

streamflow condition. During normal flow years, 

the Susquehanna River contributes about 

66 percent of the nitrogen and 40 percent of the

3 The "fall line" is a colloquial term used to refer to a distinct change 

in slope that generally occurs in a line running southwest to northeast 

through the basin. It generally represents the limit of the tidal areas 

and tends to coincide where the harder crystalline rocks of the 

Piedmont Physiographic Province and the unconsolidated rocks of the 

Coastal Plain Physiographic Province overlap.

SYNTHESIS OF DATA ~ 19
SYNTHESIS OF NUTRIENT AND

10TH PERCENTILE

Figure 8. Nutrient and sediment concentrations for 13 major subbasins for the 127 load sites in the 

Chesapeake Bay Basin.

20 - SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

1995

1990

1985

1980

1975

1970

1995

CO 1990 

CC

UJ 1985

CC

Uj 1980

I-

^ 1975

1970

1995

1990

1985

1980

1975

1970

TOTAL NITROGEN

Q

MNGO DAM, 

CONOW

Q

BOWIE, MAT 

ENT RIVER

tr

K RIVER NEA

CHOPTAN

Q

ENSBORO, M

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RIVER ABOV ALLS DAM, M

POTOMAC LITTLE F

TOTAL PHOSPHORUS

SUSPENDED SEDIMENT

CC < CC < CC <

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CC LU _^ cc =; cc > cc i

^m lyo ty> > CO > Z ^ I 

GC ^ GC ^ CC ^

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8

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S RIVER NEA

FFRRVII 1FV

is

FALL LINE STATIONS

Figure 9. Years for which annual load data are available for 

total nitrogen, total phosphorus, and suspended sediment at 

eight fall line sites in the Chesapeake Bay Basin.

SYNTHESIS OF DATA - 21
Table 5. Mean annual loads and annual yields for high, normal, and low flow water years for eight major 

subbasins in the Chesapeake Bay for the period 1972-92

[All load values are in tons per year; all yield data are in pounds per acre; -, data not available; 

N/A, insufficient data]

Mean annual load

Basin name

SusquehannaChoptank

Patuxent

PotomacRappahannock

York

Pamunkey

Mattaponi

James

Total

Total nitrogen

High

88,700

307

1,380

36,600-- 970

420

9,500

N/A

Normal

75,300

217

1,060

25,000

2,240

883- 8,830

'114,000

Low

58,500

134

840

15,900

1,760

464

170

4,180

81,900

Total phosphorus

High

4,550

23

242

2,960-- 138

38

3,900

N/A

Normal

2,580

11

77

1,380

394

112-- 1,950

'6,500

Low

1,910

5

67

998

266

58

19

733

4,060

Suspended sediment

High

2,870,000

6,810

64,900---- 292,000

11,800

1,610,000

N/A

Normal

1,040,000

2,500

29,900---- 53,400-- 1,270,000

N/A

Low

687,000

1,040

14,600---- 37,000

3,640

394,000

N/A

Total nitrogen

High

3.27

2.72

3.96

3.17 --.89

.70

1.52

N/A

Normal

2.78

1.92

3.042.16

1.40

.82 --1.41

h.77

Low

2.16

1.18

2.41

1.381.10

.42

.28

.67

1.28

Mean annual yield

Total phosphorus

High

0.17

.20

.69

.26 --.13.06.62

N/A

Normal

0.09

.10.22.11.25.10 --.31

».10

Low

0.07

.04.19.09

.17.05

.03.12.06

Suspended sediment

High

106

60

186-- 270

20

257

N/A

Normal

38

22

86---49-- 203

N/A

Low

25

9.20

42---- 34

6.0

63

N/A

1 This total does not include loads from the Mattaponi River; however, on the basis of available data from high and low years, loads from the Mattaponi River would be expected to be 

less than 1 percent of the total load from the other basins. Numbers may not equal total because of rounding.
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

phosphorus transported by the major river basins 

to the Bay. Summing mean loads from each of 

the river basins for normal flow years, 114,000 

ton/year of total nitrogen and 6,500 ton/year of 

total phosphorus are discharged to the Bay from 

basins above the fall line. Although the nitrogen 

loads from the James River were substantially less 

than those from the Susquehanna River, loads of 

total phosphorus and suspended sediment were 

similar. Most of the nitrogen transported by the 

Susquehanna River is soluble nitrogen. In 

contrast, however, phosphorus transport is 

primarily associated with sediment. Three large 

reservoirs behind dams on the Lower Susquehanna River currently trap an average of 2.4 

million tons of sediment and 2,000 tons of phosphorus per year (Lloyd Reed, U.S. Geological 

Survey, written commun., 1994).

Distribution of Nutrient 

and Sediment Yields

The Susquehanna River is the major 

contributor of nitrogen and phosphorus to the 

Chesapeake Bay (table 5). However, mean yields 

(in pounds per acre) were lower in the Susquehanna River because of the large amount of 

forest land. This indicates a disproportionate 

area of the Susquehanna River Basin is contributing a higher amount of the total load. Mean 

annual yields for total nitrogen were greatest in 

the Patuxent River Basin for high, normal, and 

low flow. Mean annual yields for total phosphorus were greatest in the Patuxent River Basin 

during high flow years and the James River 

Basin for normal flow years.

Further data analysis in this report are 

limited to data for annual yields during normal 

flow years because flow conditions effectively 

control mean annual nutrient and sediment 

yields regardless of basin size or location. Most 

sites with 5 or more years of water-quality data 

had coverage over a range of hydrologic conditions, ranging from wet (high flow) years to dry 

(low flow) years. Mean annual yields for the 127 

load sites by hydrologic condition are presented 

in appendix 7. All mean annual yields are 

reported as pounds per acre. Because of lack of 

data, 14 of the 127 load sites did not have loads 

estimated for normal flow years.

The range and variability for annual 

nutrient and sediment yields as a function of 

annual flow condition (high, normal, or low)

was examined at 15 sites (table 5). These 15 sites 

were distributed throughout the major subbasins 

of the Chesapeake Bay (fig. 10). Eight of the 15 

sites are fall line sites located near the downstream limit of the nontidal basin. The 

remaining 7 sites were selected so that, as a 

group, the 15 sites would represent a mix of 

varying land uses, physiographic provinces, rock 

types, and drainage-basin areas. For all 15 sites, 

mean annual yields of total nitrogen, dissolved 

nitrate, and suspended sediment during highflow years were larger by a factor of two or 

three compared to normal- and low-flow mean 

annual yields.

Kendall's tau correlation procedure was 

used in SAS (SAS Institute, Inc., 1990) (alpha = 

0.10) to determine if a simple linear correlation 

existed between nutrient and sediment yields and 

the percentage of land use, physiographic province, or rock type in each load basin. The 

Kendall's tau (f) is a measure of the strength of 

a monotonic relationship (from -1 to 1), is resistant to outliers, and produces accurate values of 

the p-statistic (a measure of the level of significance) for small sample sizes (Helsel and Hirsh, 

1992). The summary statistics from the correlation table are presented in appendix 8. A 

complete list of the percentage land use, physiographic province, and rock type that were used 

in correlation for all 127 load basins is presented 

in appendix 9. Table 6 is an abbreviated correlation table showing the most significant correlations.

It appears likely that land use, rather than 

rock type or physiographic province, is the most 

important variable for predicting nutrient and 

sediment yields from a basin. Significant correlations between rock type and yield or between 

physiographic province and yield may be caused 

by a predominant land use within that rock type 

or province. Results of the correlation analysis 

showed the strongest, significant (smallest 

p-values), and most consistent correlations 

between nutrient and sediment yields and agricultural land use. Basins with higher percentages 

of agricultural land discharged larger amounts 

of nutrients and sediment (fig. 11). Conversely, 

basins with higher percentages of forest land 

discharged smaller amounts of nutrients and 

sediment (table 6). Although correlations were 

not significant between carbonate rock type and 

agricultural land use, or between carbonate rock 

type and nutrient or sediment yields (table 6),

SYNTHESIS OF DATA ~ 23
SYNTHESIS OF NUTRIENT AND

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0

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PAMUNKEY RIVER NEA 

HANOVER, VA

9

MATTAPONI RIVERNEA 

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O

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$2 $$

DC in DC o7 w!j mS >=1 >9 

er> DCO 

tojp. xt l||s ^ g l

QL

<

Figure 10. Relation between annual flow condition and mean annual yields of 

selected constituents at 15 sites in the Chesapeake Bay Basin.

24 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Table 6. Results ofKendall's tou correlation test relating mean annual yields for selected 

constituents to selected land uses, rock types, and physiographic provinces

[p, measure of significance (less than 0.10 considered significant); n, degrees of freedom; 

shaded areas represent significant correlations]

1.00000 

.0 

41

Agriculture

p-value

n

Forest

p-value

n

Urban

p-value

n

Wetlands

p-value

n

Carbonate

p-value

n

Siliciclastic

p-value

n

Correlation coefficient 

Probability of obtaining correlation coefficient by random chance 

Number of observations

Total

nitrogen

0.51443

.0001

40

-.47619

m .0001

41

.16294

.1463

39

.00000

1.0000

4

.18156

.19%

26

-.17908

.1687

30

Dissolved

nitrate

0.43591

.0001

98

-.42744

.0001

99

.17977

** .0099

96

.12599

.7237

7

.06302

.4731

62

-.20378

.0079

83

Piedmont Lowlands .33333 .'M^'l

p-value

n

Great Valley

p-value

n

Blue Ridge

p-value

n

.3476

6

.11111

.6547

10

-.20513

.3290

13

Appalachian Plateau -.63576

p-value

n

.0074

11

.0953

9

-.00585

.9721

19

-.20000

.2047

21

.53781

.0001

48

Dissolved

ammonia

0.37439

.0001

54

-.25228

.0066

55

.05990

.5290

53

.04219

.8046

19

-.03275

.8022

30

.03772

.7281

42

.42857

.1765

7

-.12727

.5858

11

-.24242

.2726

12

.04219

.8046

19

Total

phosphorus

0.25655

.0002

100

-.34578

.0001

101

.23902

.0005

99

-.24968

.3098

13

.11153

.2234

55

-.26898

.0003

87

.50000

.0606

9

.19298

.2483

19

.00000

.1000

20

-.44176

.0001^ J

49 '"""

Orthophosphorus

0.19145

.0416

54

-.19629

.0367

54

.04708

.6170

54

-.14564

.5536

13

.30608

.0135

33

-.20887

.0523

42

.40000

.3272

5

-.00952

.%05

15

-.05882

.7417

17

-.27273

.2429

11

Suspended

sediment

0.29644

.0476 JH

23

-.28675

.0500 \.

24

.11089

.4595

23

-.81650 : ^z&Stl

3

.21281

.2576

16

-.16058

.3604

18

.66667

.1742

4

.46667

.1885

6

.33333

.4969

4

-.09759

.7613

7

SYNTHESIS OF DATA ~ 25
SYNTHESIS OF NUTRIENT AND

5Q Q < nn ^nn H ru-i

40.0

30.0

20.0

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cr

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^

tr

TOTAL NITROGEN YIELD

.

NUMBER OF .

LOAD SITES 2i . ;. 

 * «

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80 8.0

60 6.0

40 ^ 4.0

cr

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cr

UJ

n n n

TOTAL PHOSPHORUS YIELD

\

NUMBER OF

LOAD SITES

1

__ '

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1 *'"*>"<>'<*»«"'lir "" |T~f "

80

60

40

20

n

JH 0 10 20 30 40 50 60 70 80 90 100 ~~ 0 10 20 30 40 50 60 70 80 90 100

0- CO

AGRICULTURAL LAND USE, IN PERCENT ~: AGRICULTURAL LAND USE, IN PERCENT

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CT FORESTED LAND USE, IN PERCENT ,- FORESTED LAND USE, IN PERCENT |_ C/3

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0 10 20 30 40 50 60 70 80 90 100 

URBAN LAND USE, IN PERCENT

Figure 11. Relation between mean annual yields of total nitrogen and total phosphorus from normal flow 

years and percent of specific land use from that basin.

26 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

qualitatively, there appears to be a synergistic 

effect between agricultural land use and 

carbonate rock type on nutrient yields. When 

nitrogen yields are grouped according to the level 

of agricultural land use (greater or less than 

50 percent) and plotted in relation to the 

percentage of carbonate rock (fig. 12), the highest 

yields of total nitrogen originate in basins that are 

greater than 50 percent agricultural and have 

greater than 15 percent carbonate rock. Even 

where agricultural land use represents less than 

50 percent of the land use in a basin, agricultural 

practices can have a significant effect on the 

magnitude of nutrient loads (fig. 12).

Urban land use also showed a positive correlation with yields of total nitrogen, total phosphorus, and dissolved nitrate. The correlations, 

however, may be misleading because many of the 

basins used in the correlation analysis were dominated by forest or agricultural land use; urban 

effects represent only a small percentage of total 

basin area (fig. 11). Therefore, to examine the 

effects of urban land use, the mean annual yields 

for the entire Bay Basin were compared to small, 

predominantly urban basins. Fifteen basins in the 

database have greater than 25 percent urban land 

use; however, only 7 of those basins have sufficient yield data for analysis (table 7). Almost all 

of the mean annual yields from the predominantly urban basins are less than the mean annual 

yields for all 127 load basins. Two load basins 

were identified with high percentages of both 

urban and agriculture land: 01616000 and 

01586000 (table 7). Nutrient yields from these two

basins were larger than yields from all 127 load 

basins. Nutrient yields for predominantly agricultural basins (greater than 50 percent) (table 7) 

were substantially higher than mean yields from 

all the load basins. Therefore, the two mixed agricultural, urban basins probably had yields greater 

than mean yields from all the load basins because 

of the agricultural influence.

The only significant correlations between 

rock type and yields of nutrients or sediment were 

for siliciclastic rock. Mean annual yields of 

dissolved nitrate, total phosphorus, and dissolved 

orthophosphorus decreased as the percentage of 

the basin underlain by siliciclastic rock increased. 

Siliciclastic rocks are more resistant to weathering 

than carbonate rock, resulting in thin, commonly 

rocky soils, and areas underlain by siliciclastic 

rocks are dominated by steep slopes, which makes 

agriculture difficult. Although most of the basins 

containing a large percentage of siliciclastic rocks 

are forested, broad ridges in siliciclastic areas 

support some agricultural activity. No other 

significant correlations were found between 

nutrient or sediment mean annual yields and rock 

type.

The temperate climate and broad valleys of 

the Piedmont Lowlands and the Great Valley are 

conducive to productive agriculture. The Piedmont Lowlands (fig. 6) are mostly underlain by 

carbonate rock (82 percent) and the land is 

predominantly agricultural (70 percent). Previous 

studies (Fishel and others, 1992; Lietman and 

others, 1983) noted elevated nutrient loads in

Q

_j 

LU

2 

LU 

O

OLU 

cccc 

bo

-ICC

<UJ

i

30

20

10

 LESS THAN 50

 GREATER THAN OR 

EQUAL TO 50

10 20 30 40 50 60 70 

PERCENTAGE OF CARBONATE ROCK

80 90 100

Figure 12. Differences in mean annual yields of total nitrogen from normal flow 

years as a function of percentage carbonate rock and percentage agriculture.

SYNTHESIS OF DATA ~ 27
Table 7. Comparison of percentage land use, percentage rock type, and mean annual nutrient yields for 

predominantly urban and predominantly agricultural basins

[Yields are in pounds per acre; --, no data]

Percentage land use

Basin

Area 

(square 

miles) Urban Agriculture Forest Carbonate rock

Percentage rock type

Siliciclastic 

rock

Crystalline 

rock

Mean annual yields

Total n. . 

Unconsolidated Total ammonia 'ssoye 

. . nitrate rock nitrogen plus organic 

,. nitrogen nitrogen

All 127 load basins 11.4 3.7 6.1

Total 

phosphorus

0.70

Predominantly urban basins

015710000158930001593500

01646000

01649500

01657655

11.2

32.538.0

57.972.8

4.0

46.0

54.454.550.956.9

48.6

26.8

16.8

16.8

11.4

9.1

22.5

28

272128

22

27

9

6

0000

91

00

2

00

0

94

100

98

23

100

0

0

0

0

77

0

8.0 4.5

3.2

..

2.8

..

2.0

3.7

5.2 --3.1

3.4 -- .80-- .67 .62-.28

Agricultural and urban basins

01586000

01616000

56.6

16.5

42.4

43.8

51.0

41.9

3.4

13

0

71

0

29

100

0

00

13.3

21.1

11.3

8.6

.41

4.0

Predominantly agricultural basins

01573810

0157608335

01639500

.38

1.42

102

1.4

1.1

1.1

91.0

63.469.9

6.7

2629

0

50

1

100

50

28

00

71

000

39.5 22.4

25.4 12.0

15.1 2.8

19.714.411.8

6.3

4.5--
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

areas of the Piedmont Lowlands. For the load 

subbasins, yields of dissolved nitrate and total 

phosphorus increased as the percentage of the 

basin in the Piedmont Lowlands increased (table 

6). About 70 percent of the Piedmont Lowlands is 

in agricultural land use (fig. 6). Yields for total 

nitrogen and total phosphorus decreased and 

yields for dissolved nitrate increased as the 

percentage of the basin in the Appalachian Physiographic Plateau increased. About 70 percent of 

the Appalachian Plateau is forested, and 24 

percent is agriculture. No other significant correlations existed between nutrient and sediment 

yields and physiographic province.

The spatial distribution of yields of total 

nitrogen, total phosphorus, and dissolved nitrate 

are shown in figures 13, 14, and 15. Symbols, 

representing the basins with yield data, identify 

the mean annual yield as 50 percent above, 

50 percent below, or within 50 percent of the 

mean annual yields of all the sites. The yields are 

consistently higher in the Lower Susquehanna 

subbasin and central areas of the Potomac River 

subbasin, where 21 of the 27 subbasins with 

greater than 50 percent agricultural land use are 

located. As forested areas increase, as in northern 

Pennsylvania and western Virginia (fig. 5), the 

yields are consistently lower.

Mean annual yields of total nitrogen, total 

phosphorus, and dissolved nitrate were examined 

with respect to combinations of predominant 

rock types and land uses (table 8). A rock type 

was considered predominant if it underlies greater 

than 50 percent of the basin. Additionally, the 

predominant percentages for agriculture 

(50 percent) and urban (25 percent) land uses 

were used previously in this report (table 7). 

Although no load subbasins contained 

100 percent of a single land use, assignment of a 

dominant land use aided in classifying small and 

medium size subbasins that generally represent 

the influences of individual land uses. For the 

purposes of this analysis, forest was considered 

dominant in a basin if the forested area was 

greater than 75 percent, agricultural if the area 

was greater than 50 percent, and urban if the area 

was greater than 25 percent. These percentages 

were selected to help eliminate the same basin 

from having multiple land uses. By use of these 

percentages, 68 sites that had a predominant land 

use were selected; the average drainage area was 

279 mi2. The mixed land-use classification

(table 8) represents 45 percent of the basins that 

were less than the indicated percentage of land 

use; 14 of the 15 load basins greater than 

5,000 mi2 were mixed land-use basins. The largest 

nutrient yields are from the agricultural/carbonate 

basins, and the smallest yields are from the mixed 

land use/crystalline rock type combination 

(table 8). Loads of total nitrogen, dissolved 

nitrate, and total phosphorus were higher in 

predominantly agricultural areas than in predominantly forested areas. Because of limited data, a 

more detailed analysis of the combined influence 

of rock type and land use cannot be made. The 

variability in the means is less in the mixed land 

use and rock type than in the predominant landuse classifications. This suggests a mixing and 

dilution of extreme effects of single-land-use 

basins.

Annual base-flow loads of dissolved nitrate 

were estimated from 92 sites. Annual dissolvednitrate loads were significantly higher in predominantly agricultural land use areas (greater than 

50 percent) than in predominantly forested areas 

(greater than 75 percent) and predominantly 

urban land use areas (greater than 25 percent) 

(fig. 16). Annual loads of dissolved nitrate were 

significantly greater in predominantly carbonate 

rock (greater than 50 percent) than in predominantly siliciclastic, crystalline, and unconsolidated 

rock. The median load of dissolved nitrate was 

greatest (10.7 Ib/acre) in the agricultural/ 

carbonate combination and smallest (2.1 Ib/acre) 

in the forest/siliciclastic combination. The median 

load of dissolved nitrate for basins in predominantly siliciclastic rock type was 3.0 Ib/acre; 

however, the elevated median load of dissolved 

nitrate in the agricultural/siliciclastic land-use/ 

rock-type combination (9.8 Ib/acre) is probably 

related to the high percentage (42 percent, 

table 9) of agricultural land use in the siliciclastic 

rock.

For all basins for which total nitrogen and 

base flow dissolved-nitrate loads could be estimated, about 42 percent of the total nitrogen was 

dissolved nitrate in base flow. The percentage of 

dissolved-nitrate yield in base flow to total 

nitrogen yield was largest (58 percent) in the agricultural/carbonate combination and smallest 

(31 percent) in the forest/siliciclastic land-use/ 

rock-type combination.

SYNTHESIS OF DATA ~ 29
SYNTHESIS OF NUTRIENT AND

EXPLANATION

Subbasin

^1 Upper Susquehanna

IB West Branch Susquehanna

 Juniata

^1 Lower Susquehanna

 Choptank

CH Patuxent

 Western Shore

CD Upper Potomac

^1 Lower Potomac

 Shenandoah

 Rappahannock

 York

CZI James

Mean Annual Yields 

Total Nitrogen

A >=17.0 (lb/acre)/yr

 >= 5.70 and < 17.0 (lb/acre)/yr

V < 5.70 (lb/acre)/yr

0 20 40 60 80 100 KILOMETERS

Figure 13. Locations of all total nitrogen sites and range in annual total nitrogen yields in the Chesapeake Bay Basin

30 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

EXPLANATION

Subbasin 

H Upper Susquehanna

West Branch Susquehanna

Juniata

Lower Susquehanna

Choptank

Patuxent

Western Shore

Upper Potomac

Lower Potomac

Shenandoah 

H Rappahannock

 York 

O James

Mean Annual Yields 

Total Phosphorus 

A >= 1.00 (lb/acre)yr

 >= 0.35 and < 1.00 (lb/acre)/yr 

Y < 0.35 (lb/acre)/yr

75"

77°

20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

Figure 14. Locations of all total phosphorus sites and range in annual total phosphorus yields in the 

Chesapeake Bay Basin.

SYNTHESIS OF DATA ~ 31
SYNTHESIS OF NUTRIENT AND

EXPLANATION

Subbasin

^1 Upper Susquehanna

CJ West Branch Susquehanna

 Juniata

H Lower Susquehanna

H Choptank

CH Patuxent

H Western Shore

H Upper Potomac

H Lower Potomac

 Shenandoah

H Rappahannock

 York

 James

Mean Annual Yields 

Dissolved Nitrite plus Nitrate

A >=10.0 (lb/acre)/yr

 >= 3.3 and < 10.0 (lb/acre)/yr

I < 3.3 (lb/acre)/yr

77°

 T,*X~A-~ ~

l^J^g ¥-4

H-? ^ML ifS

I, rr?yt>M

20 40 60 60 100 MILES

0 20 40 60 80 100 KILOMETERS

Figure 15. Locations of all dissolved nitrate sites and range in annual dissolved nitrate yields in the 

Chesapeake Bay Basin.

32 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

o

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CC

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CC

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' "= "I . CD

oo oo r*^ c

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c

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~^ ?N O <N *-

%

CO

a

Carbonate Siliciclastic Crystalline 

Unconsolidated Mixed land for use 

cs m os

m ^- oo i i

fN ^- Os vO

^ ~

rn ^ vq vo

m r- vo os ^- p i « vo

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Unconsolidated

SYNTHESIS OF DATA ~ 33
SYNTHESIS OF NUTRIENT AND

25

20

UJ 15

rr 

o 10

EC 

LU 

CL

CO 

Q

Z

Q

_l 

111

>

HI 

I- 

<

DC

Q 

LU

CO 

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5

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CO

15

10

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0

42 31 52 48

ALL FOREST AGRICULTURE

PREDOMINANT LAND USE

URBAN

58

_L

42 49 54

T

CARBONATE SILICICLASTIC CRYSTALLINE UNCONSOLIDATED

PREDOMINANT ROCK TYPE

31 58 50 53 53

FOREST/ AGRICULTURE/ AGRICULTURE/ AGRICULTURE/ URBAN/ 

SILICICLASTIC CARBONATE SILICICLASTIC CRYSTALLINE CRYSTALLINE

PREDOMINANT LAND USE/ROCK TYPE COMBINATIONS

50

EXPLANATION

PERCENTAGE OF DISSOLVED NITRATE 

TO TOTAL NITROGEN

90TH PERCENTILE

75TH PERCENTILE

MEDIAN

25TH PERCENTILE

10TH PERCENTILE

Figure 16. Relation between mean annual 

yields of dissolved nitrate in base flow and land 

use, rock type, and combinations of land use 

and rock type in the Chesapeake Bay Basin. 

Numbers represent the percentage of 

dissolved nitrate to total nitrogen.

34 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Table 9. Percentage of the total area of the Chesapeake Bay Basin in combination with specific land 

use and physiographic province or rock type and the percentage of the specific land use within each 

physiographic province and rock type

[mi2, square mile; <, less than]

Forest 

(34,811 mi2)

Agriculture 

(19,811 mi2)

Urban 

(4,726 mi2)

Percentage Percentage 

of Bay Basin of forest

Percentage Percentage Percentage Percentage 

of Bay Basin of agriculture of Bay Basin of urban

Physiographic Province

Appalachian Plateau Province

Appalachian Mountain Section

Great Valley Section

Blue Ridge Province

Reading Prong Section

Mesozoic Lowlands Section

Piedmont Lowland Section

Piedmont Upland Section

Coastal Plain Province

Total 

Carbonate

Siliciclastic

Crystalline

Unconsolidated

"Total

16.8

17.3

2.0

2.9

<.01

1.4

.1

8.4

7.9

4.1

33.7

11.0

8.0

30

31

3

5

<.01

2

<.01

15

14

100

6

61

19

14

100

6.0

6.3

4.3

.76

<.01

1.8

.68

6.3

5.9

5.6

13.3

7.0

6.2

19

21

14

.02

<.01

6

.02

21

19

'100 !

17

42

21

20

100

0.66

.73

.55

.07

<.01

.28

.15

1.4

2.1

.75

1.8

1.3

2.0

12

13

11

.03

<.01

7

4

22

31

100

15

30

22

33

^100

Distribution of Geographic Data

One of the major advantages of using a GIS 

database is that many different data layers of 

spatial information can be overlaid (or intersected) to provide a means of combining data. 

The intersection of the data sets for land use, in 

combination with physiographic province or rock 

type for the Bay Basin (table 9), indicates about 

one-third of the Basin is forest underlain by siliciclastic rock. About 61 percent of the forested 

areas in the Bay Basin are in the Appalachian 

Plateau Physiographic Province and the Appalachian Mountain Section. The largest amount of 

agriculture, 42 percent, is in areas underlain by 

siliciclastic rock. Only 17 percent of agricultural 

areas are underlain by carbonate rock. Agricultural areas underlain by carbonate rock are 

predominantly in the Piedmont Lowlands and 

Great Valley Sections. The location of carbonate 

rock and the intersection of agricultural areas 

underlain by carbonate rock in the Bay Basin are 

shown in figure 17. Agricultural basins, especially 

those underlain by carbonate rock, generally have 

been given a high priority for study and implementation of best-management practices because 

studies have documented elevated nutrient and

sediment loads from agricultural basins. About 

21 percent of the agricultural land in the Bay 

Basin is located in the Piedmont Uplands and 

Lowlands Sections, which accounts for about 

18 percent of the basin area. The Piedmont Physiographic Province contains the locations of some 

of the highest nutrient yields in the Bay Basin, 

suggesting the agricultural activity here may be 

more intensive than in other physiographic province, rock-type, and land-use combinations. 

Urban land use is distributed fairly evenly among 

rock types. Urban land use is primarily in the 

Piedmont Upland and Coastal Plain Physiographic Provinces.

Identification of Spatial 

and Temporal Data Gaps

The preceding sections discussed the distribution of the water-quality, load, and yield data 

according to land use, physiographic province, 

rock type, and hydrologic condition. However, 

the data analysis was limited by many factors, or 

"gaps," in data needed to calculate nutrient or 

sediment loads and analyze and interpret the 

data.

SYNTHESIS OF DATA ~ 35
SYNTHESIS OF NUTRIENT AND

EXPLANATION

^| Agriculture land use and Carbonate rock type

B Carbonate rock only

| | Predominantly carbonate load basin

20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

Figure 17. Carbonate rock areas and agricultural areas underlain by carbonate rock in the Chesapeake Bay Basin. 

36 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

The following section identifies spatial and 

temporal gaps in the database. Spatial gaps are 

defined as those areas where insufficient data exist 

to adequately characterize or identify the 

following: the areal coverage and geographic 

location of basins; the number of water-quality 

and load sites; and the combination of land use, 

physiographic province, and rock type. Temporal 

gaps are defined as interruptions in the waterquality and water-discharge records of sufficient 

lengths to prevent data analysis. Spatial and 

temporal gaps affect the ability to target locations 

for management actions intended to improve 

water quality or to document water-quality 

changes. The identification of gaps may also indicate the need to revise existing monitoring 

programs.

The simplest method of identifying spatial 

data gaps is visual observation of the distribution 

of the data through mapping. The locations of 

the 1,058 water-quality sites (fig. 3) where 

nutrient and sediment samples were collected 

suggests good areal coverage throughout the Bay 

Basin. The sites are fairly evenly distributed in the 

13 major subbasins, although there is some clustering around areas of high populations. The 

water-quality sites are less dense in headwater 

streams and more dense near main stems of 

major rivers.

Only 127 or 12 percent (fig. 4) of the 1,058 

water-quality sites (table 2) had sufficient data to 

estimate nutrient and sediment loads. Loads 

could not be calculated for many of the waterquality sites because large temporal gaps existed 

in the water-quality data, only short-term data 

(less than 3 years) was collected, less than the 

minimum number of samples needed for the load 

model were collected, or continuous dailydischarge data were not available. Continuous 

daily-discharge data did not exist for 487 waterquality sites (207 sites in Virginia) that met the 

minimum criteria required for load estimations.

Most of the load sites are located in the 

Lower Potomac, the upper reaches of the James, 

and most of the Susquehanna River Basins 

(fig. 4). Conversely, very few load sites are in the 

Juniata River, the York River, and middle and 

lower reaches of the James River Basins and in 

the nontidal parts of the eastern shore of the Bay. 

Drainage areas of the 127 load sites cover 

approximately 92 percent of the nontidal part of 

the Chesapeake Bay Basin. Most of the area not

covered by load basins is located on the eastern 

shore of the Bay. Coverage of load basins was 

evaluated by comparing the average areal 

coverage of each load basin to the total area of 

the Chesapeake Bay. If load basins were evenly 

distributed across the Bay Basin, each would 

drain about 500 mi2. Computation of the average 

drainage area per load site within each basin, 

ignoring basin overlap common to upstreamdownstream sites, indicates only four of the river 

subbasins the Upper Susquehanna, West 

Branch Susquehanna, Juniata, and James, which 

are dominated by forest areas (fig. 5) exceed 

500 mi2 per site. However, basin size varies 

widely, from very small (0.38 mi2) to very large 

(27,100 mi2). Thirty percent of the basins are 

smaller than 100 mi2, and 16 percent are larger 

than 2,5t)0 mi2. Also, many of the load sites are 

nested within one or more other load sites. None 

of the load sites represented a basin with a single 

land use; however, one-third of the load sites 

contained greater than 70 percent forest land, 

only a few sites contained greater than 70 percent 

agricultural land, and no sites contained greater 

than 70 percent urban land (fig. 11).

Because drainage areas of the load basins 

cross physiographic provinces and rock-type 

boundaries, visual inspection of the locations of 

data-collection points for the load sites may be 

misleading for identification of gaps. The percentage physiographic province and percentage 

rock type were determined for each load basin 

and were stored in the database (appendix 9). The 

Appalachian Plateau Province and the Appalachian Mountain Section, comprising about 

48 percent of the Bay Basin, are predominant 

(greater than 50 percent) in 53 of the load sites 

(fig. 6). The Piedmont Province, comprising only 

22 percent of the basin, is predominant in 36 

sites. The Reading Prong Section of the New 

England Province is not predominant in any load 

sites. Almost 51 percent of the load sites are 

underlain by predominantly siliciclastic rocks. 

Only 8 load sites are located in the Coastal Plain; 

7 of these are underlain predominantly by unconsolidated rocks. Although 20 percent of the Bay 

Basin is underlain by unconsolidated rocks, only 

parts are nontidal and suited for load sites.

Of the 127 load basins, 28 were in predominantly forested (greater than 75 percent) areas; 

nearly all of those were underlain by siliciclastic 

rock. Load data is available for only two predominantly forest sites underlain by carbonate rock

SYNTHESIS OF DATA ~ 37
SYNTHESIS OF NUTRIENT AND

and none underlain by crystalline or unconsolidated rock, where 31 percent of the forest cover is 

located (tables 8 and 9). Of the 25 predominantly 

agricultural (greater than 50 percent) load basins, 

5 were underlain by carbonate, 8 by siliciclastic, 

and 11 by crystalline rocks. Only one was underlain by unconsolidated rocks, where about 

20 percent of the agricultural land use is located 

(tables 8 and 9). Only 15 of the load basins were 

predominantly urban (greater than 25 percent). 

Ten of the 15 urban basins were underlain by 

crystalline rock; however, only 22 percent of the 

urban land use is underlain by crystalline rock. 

This analysis suggests that insufficient load sites 

and data exist in the Chesapeake Bay Basin to 

determine the relative importance of rock type in 

transport of nutrients and sediment loads. This 

was found to be important in at least one case: 

nutrient loads from agriculture were larger in 

areas underlain by carbonate rock than in areas 

underlain by other rock types.

Spatial gaps also can be determined by examining the amount of area being monitored for a 

given category of land use, physiographic province, rock type, and combinations thereof, relative to the amount of land in that category in the 

entire Bay Basin. The land-use/rock-type categories for which load data were available for more 

than two sites (table 8) were examined using a 

"density of monitoring" method. A comparison 

of the ratio of drainage areas for load basins in a 

predominant land-use/rock-type combination 

with the percent of the Bay Basin in the same 

land-use/rock-type combination provided the 

following results. The ratios, or density of monitoring, are shown as "less than" because drainage 

areas for load basins also include areas not in the 

predominant category:

Predominantly agricultural/carbonate basins - 

less than 34 percent

Predominantly agricultural/siliciclastic basins - 

less than 18 percent

Predominantly agricultural/crystalline basins - 

less than 43 percent

Predominantly forested/carbonate basins - 

less than 35 percent

Predominantly forested/siliciclastic basins - 

less than 91 percent

Predominantly urban/crystalline basins - 

less than 43 percent

The predominantly forested and siliciclastic 

combination had the greatest density of monitored area (up to 91 percent). There are 26 load 

sites in this combination; however, sufficient data 

for calculating total nitrogen yields existed at 

only 2 of the 26 load sites. The agricultural and 

siliciclastic combination with the greatest 

maximum yields of total nitrogen and total phosphorus (table 8) had the least dense monitoring. 

This type of information could be important in 

targeting areas for future monitoring. It may be 

desirable to have information over a larger 

percentage of certain combinations of land-use, 

physiographic-provinces, or rock-type combinations because of the impact of that combination 

on water quality in the tributaries and the Bay. 

As "high-impact" areas are targeted for management practices, baseline data and post-implementation data will be needed to evaluate the effect of 

management practices on water quality. For 

example, it may be more desirable to monitor a 

greater density of basins in agricultural land than 

forested land because discharges from agricultural 

areas deliver larger nutrient and sediment loads to 

streams and the Bay than forested land. 

Conversely, if nutrient and sediment loads are 

low from some categories with little data available, it is also important to have a sufficient 

density of monitoring data to document that 

these areas actually discharge small loads. 

Adequate density of monitoring data will help 

prevent invalid assumptions and predictions of 

the impact of a factor such as land use or rock 

type on water quality. Limited data exist in three 

of the predominantly forested, one of the 

predominantly agricultural, and three of the 

predominantly urban land-use/rock-type combinations (table 8).

If the variability is large, there may be need 

for additional monitoring or analysis to interpret 

and apply the data results, even where a large 

number of load sites are monitored. The coefficient of variation (cv), a dimensionless ratio of 

the standard deviation to the mean, is sometimes 

used to compare variabilities between data sets, 

particularly when ranges in data values are large. 

Generally, the greater the cv, the more variable 

the data. For most of the land-use and rock-type 

combinations, there is insufficient data to calculate a useful cv (table 8). For the few land-use 

and rock-type combinations where cv's were 

calculated, the variances for total nitrogen, 

dissolved nitrate, and total phosphorus yields

38 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

were low and not extremely different from each 

other. Koerkle reported ranges in the cv from 

studies in the Piedmont area of Lancaster County 

in southeastern Pennsylvania to range from 0 to 

15 (Edward H. Koerkle, U.S. Geological Survey, 

written commun., 1995). This suggests that 

nutrient yield data from some combinations, 

where there are sufficient load sites for analysis, 

could be used to project yields from similar, 

nonmonitored sites or used to target management 

practices.

Spatial and temporal gaps in the database 

can be identified by examining the years for 

which each site has an estimated load. Loads for 

total nitrogen, total ammonia plus organic 

nitrogen, dissolved nitrate, total phosphorus, and 

suspended sediment (fig. 18) for 127 load sites are 

organized in downstream order in the 13 major 

subbasins. The load sites are identified by basin 

number and arranged in downstream order to 

correspond to figure 18 and are presented in 

appendix 10. Total nitrogen loads don't exist for 

most of the load basins (fig. 13) for most years. 

Only 38 percent of the load sites had total 

nitrogen-load data for 3 or more years. Total 

nitrogen is a calculated sum of total ammoniaplus-organic and dissolved-nitrate data. Total 

nitrogen data are available at most sites after 

1985, when analysis of samples for total ammonia 

plus organic nitrogen increased. Prior to 1985, 

most of the estimated loads of total ammonia 

plus organic nitrogen were in the Potomac and 

James River Basins; since 1985, most of the loads 

of total ammonia plus organic nitrogen are from 

the Lower Susquehanna River Basin (fig. 18). The 

number of sites where dissolved-nitrate loads 

existed (108) were the most for any water-quality 

constituent. Dissolved-nitrate loads were available 

at most sites for most years, with the exception of 

the Lower Potomac Basin (figs. 15 and 18). 

Spatial and temporal distribution of total phosphorus loads indicates excellent coverage in the 

Susquehanna River Basin (figs. 14 and 18). 

Spatial and temporal gaps existed in the Upper 

and Lower Potomac Basins from 1985 to 1989. 

These gaps were caused by a laboratory problem 

with the total phosphorus analysis method 

(Sherm Garrison, Maryland Department of the 

Environment, oral common., 1995). The largest 

number of annual loads were estimated for total 

phosphorus (1,429) (fig. 15). Very little 

suspended-sediment-load data exists throughout 

the Chesapeake Bay Basin (fig. 18). Spatially,

suspended-sediment-load data is concentrated in 

the Lower Susquehanna and Patuxent River 

Basins. Most of the suspended-sediment data 

were collected through cooperative programs with 

the uses or were collected as part of the National 

Stream Quality Accounting Network (NASQAN). 

Analysis of water samples for the state programs 

was primarily for total suspended solids rather 

than suspended sediment. However, loads were 

not estimated for total suspended solids because 

Hardy (U.S. Geological Survey, oral commun., 

1993) noted that studies have documented differences of up to 30 percent between suspended-sediment and total-suspended-solids-concentration 

data. Differences in laboratory methods used to 

determine total suspended-solids concentrations 

also contributed to variable results. Although 

loads were not calculated for total suspended 

solids, concentration data are included in the 

water-quality database.

Water-quality-trend analysis is one of the 

primary techniques used to indicate if water 

quality is changing over time. Any changes in 

water quality can be further examined with 

respect to a management practice to determine if 

the management practice is producing the desired 

change. To calculate water-quality trends for any 

basin, ideally, the water-quality record should be 

at least 10 years in length to eliminate the chance 

of false trends caused by the natural variation in 

streamflow and seasonality. However, trend 

studies on water-quality data of less than 10 years 

are common. Within the Chesapeake Bay Basin, 

the length of record for annual loads was examined at all 127 load sites. Load sites were identified in three groups: less than 5 years, 5 to 9 

years, and 10 or more years of estimated annual 

loads. For the 48 total nitrogen sites, 9 sites had 3 

to 5 years, 28 sites had 5 to 9 years, and 11 sites 

had 10 or more years of annual load data 

(fig. 19); the average length of annual load record 

was about 8 years. Unlike total nitrogen, 58 of 

the 108 total phosphorus load sites had 10 or 

more years, 35 sites had 5 to 9 years, and 15 sites 

had 3 to 5 years of annual load data (fig. 20). The 

average length of the total phosphorus annual 

load record was about 12 years.

Limitations in the GIS spatial data sets for 

land use, physiographic province, rock type, and 

watershed delineations prevented certain types of 

data analysis and may have contributed to some 

data gaps. For example, the land-use data set 

classification for agricultural land includes both

SYNTHESIS OF DATA ~ 39
SYNTHESIS OF NUTRIENT AND

1995 

1990

TOTAL NITROGEN AS N 1985 

1980 

1975

1970

1995

1990

TOTAL ORGANIC PLUS 

AMMONIA NITROGEN

1980

1975

1970

1995

1990

DISSOLVED NITRATE AS N 1985

1980 

1975

1970

1995

1990

TOTAL PHOSPHORUS AS P 1985

1980 

1975

1970

1995

1990

SUSPENDED SEDIMENT 1985 

1980 

1975 

1970

1 2345678 9 101112 13

SUBBASIN NUMBER

Figure 18. Spatial and temporal distribution of the 127 load sites and years with an estimated load arranged by 

the 13 subbasins in downstream order (see appendix 10).

40 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

EXPLANATION

	Subbasin

 Upper Susquehanna

 West Branch Susquehanna

^1 Juniata

 Lower Susquehanna

 Choptank

EH Patuxent

 Western Shore

L71 Upper Potomac

 Lower Potomac

 Shenandoah

 Rappahannock

 York

F I James

Total Nitrogen Load Site

O Less than 5 years

 5 to 9 years

A Greater than 9 years

NEW YORK 

PENNSYLVANIA

0 20 40 60 80 100 MILES I h S ' i ' 

0 20 40 60 80 100 KILOMETERS

Figure 19. Length of annual estimated load record for 48 total nitrogen sites in the Chesapeake Bay Basin.

SYNTHESIS OF DATA ~ 41
SYNTHESIS OF NUTRIENT AND

EXPLANATION

	Subbasin

H Upper Susquehanna

H West Branch Susquehanna

 Juniata

 Lower Susquehanna

H Choptank

CH Patuxent

 Western Shore

CI1 Upper Potomac

H Lower Potomac

 Shenandoah

H Rappahannock

 York

CZ3 James

Total Phosphorus Load Site

O Less than 5 years

 5 to 9 years

A Greater than 9 years

NEW YORK 

PENNSYLVANIA

w^O *

 K ; 

0 20 40 60 80 100 MILES I h ' ' i i ' ' 

0 20 40 60 80 100 KILOMETERS

Figure 20. Length of annual estimated load record for 99 total phosphorus sites in the Chesapeake Bay Basin.

42 ~ SYNTHESIS OF DATA
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

crop land and pasture land; however, contributions of nutrients and sediments from crop land 

may vary from contributions of nutrients and 

sediments from pasture land (Lietman and others, 

1983). Therefore, distinguishing between crop and 

pasture land within a basin may help in the analysis of relations between land use, other physical 

factors, and nutrient and sediment loads. 

Although physiographic-province and rock-type 

data sets were compiled from existing data sets, 

different resolutions were available for use in 

Pennsylvania, Maryland, and New York. When 

data sets are compiled at two different resolutions, the resultant analysis is dependent upon the 

scale of the least resolution. For example, if you 

combine 1:24,000 scale data and 1:500,000 scale 

data, the resulting data set will be accurate at the 

1:500,000 scale. When the GIS data sets were 

combined, gaps and inconsistencies were most 

prevalent across the state boundaries. Along with 

scale, descriptive information (attributes) can also 

cause gaps when data are combined. Although 

watershed delineations were combined from 

existing data at a scale of 1:24,000, the information and criteria used to define the delineations 

were different. In Pennsylvania, all named 

streams are delineated; in Maryland, all third 

order streams are delineated; and in Virginia, 

delineations appear to be related to the Natural 

Resource Conservation Service (NRCS) hydrologic 

unit boundaries. Selection of basins in predominant combinations of land use and rock type was 

very difficult because of the different attributing 

and delineation schemes used. For example, while 

5 of the 127 load basins were considered predominantly agricultural/carbonate basins, the total 

number of predominantly agriculture/carbonate 

basins that could potentially be targeted for study 

is unknown. In order to identify these basins, 

additional basin delineations are needed.

The availability of a Bay-wide spatial and 

temporal water-quality SAS data set and a Baywide spatial data set of land use, physiographic 

province, and rock type provides much of the 

vital information needed to guide decisions on 

future monitoring. Identification of the characteristics of areas with high or low nutrient or sediment yields and knowledge of the locations of 

previously monitored areas can be useful in 

designing a monitoring strategy to evaluate 

nutrient-reduction programs.

Potential Applications of Database

The SAS and GIS databases described in this 

report, and delivered to the Chesapeake Bay 

Program, include the following: (1) water-quality 

concentration data for 129,990 individual sample 

analyses, and associated flows where available, 

collected during 1972 to 1992 from 1,154 different 

sites in the nontidal part of the Chesapeake Bay,

(2) nutrient- and sediment-load estimates for a 

total of 8,080 annual load values from 127 sites,

(3) dissolved-nitrate base-flow load estimates for a 

total of 978 annual load values from 92 sites, (4) 

geographical data layers for land use, physiographic province, rock type, and basin delineations for the entire Chesapeake Bay Basin, and 

(5) attributes for the percentage of each 

geographical data layer for all 127 load subbasins.

Considering the importance of this data 

source, it is imperative to keep it as a "living 

database" with future updates of water-quality 

data, load calculations and GIS information. It is 

equally important that all potential users of this 

database be made aware of its existence and be 

informed on how to use it. This central source for 

nutrient data collected in the nontidal part of the 

Chesapeake Bay watershed should be accessible 

to researchers and managers through the Chesapeake Bay Program Office. This hopefully will 

encourage future studies to use this information 

and, thus, contribute to the ultimate goal of the 

USEPA Chesapeake Bay Program: to improve 

ecological conditions and the health of living 

resources in the Bay. Persons wishing to use the 

information may do so in a number of different 

ways. Some examples are listed here:

 The database can be used to perform trend 

analysis of the nitrogen and phosphorus 

water-quality-concentration and load data.

 Managers and researchers may refer to the 

spatial and temporal distribution of the 

water-quality data when determining future 

needs for data collection.

 The database may be accessed so that GIS 

overlay maps of nutrient- and sediment-load 

data with geographic information can be 

created in ARC/INFO computer software. This 

may be particularly useful to guide managers 

and scientists in identifying and targeting 

areas for implementation and monitoring.

SYNTHESIS OF DATA ~ 43
SYNTHESIS OF NUTRIENT AND

 Areas where best-management practices are 

implemented can be tracked in a GIS system 

and compared to water-quality changes over 

time in basins where implementation occurs.

 Subsets of the data may be obtained from the 

USEPA Oracle database for a researcher 

having a particular project requiring the 

information.

SUMMARY AND CONCLUSIONS

Nutrient and sediment data on tributaries 

from nontidal parts of the approximately 

64,000 mi2 Chesapeake Bay Basin were compiled 

into a single database. An evaluation of nutrientand sediment-yield data (1) examined yields with 

respect to land use, physiographic province, rock 

type, and hydrologic characteristics, (2) identified 

spatial and temporal gaps, and (3) revealed 

potential additional uses of the database.

Nutrient- and sediment-concentration data 

collected by local, state, and Federal agencies 

between 1972 and 1992 for 1,058 sites were 

compiled in a SAS data set. Minimum requirements for inclusion in the data set were collection 

of at least 12 water-quality samples representing 

the 4 seasons of the year and at least 3 consecutive years of sample collection. If at least 50 

water-quality samples and continuous-flow data 

were available over any 3 year period, annual 

nutrient and sediment loads were estimated by 

use of a 7-parameter log-linear multiple regression model. Of the 1,058 unique site locations 

where water-quality data were collected, adequate 

data were available to estimate annual loads for 

127 of the sites. Annual loads and yields were 

compiled in a SAS data set and classified as high, 

normal, or low flow on the basis of the ratio of 

the annual mean discharge to the long-term mean 

annual discharge.

Spatial data were compiled in a GIS data set 

for the entire Bay Basin. The USEPA EMAP data set 

(1:100,000) provided data for nine land use 

categories: forest, agriculture, four urban classifications, water, exposed land, and wetland. The 

physiographic province data set (1:500,000), 

compiled from several state and Federal agencies, 

identifies six major provinces the Appalachian 

Plateau, Ridge and Valley, Blue Ridge, New 

England, Piedmont, and Coastal Plain and 

includes subdivisions for two provinces. The 

rock-type data set (1:500,000) represents data 

compiled from state and Federal agencies and

contains four broad rock types based on similar 

lithologic and geologic characteristics: carbonate 

rocks, crystalline rocks, siliciclastic rocks, and 

unconsolidated sediments. Nutrient and sediment 

data were examined with respect to land use, 

physiographic province, rock type, and hydrologic condition. To facilitate analysis of the 127 

sites where loads were estimated, the sites were 

grouped by 13 major subbasins in the Chesapeake 

Bay.

The largest median concentrations of total 

nitrogen (4.2 mg/L) and total phosphorus 

(0.23 mg/L) were in the Lower Susquehanna 

River Basin, the largest median concentration of 

dissolved nitrate (1.9 mg/L) was in the Western 

Shore Basin, and the largest median concentration of suspended sediment (124 mg/L) was in the 

Upper Potomac River Basin. The greatest range 

in concentrations and the maximum concentrations were in the Lower Susquehanna River 

Basin.

Six major rivers contribute about 90 percent 

of the freshwater flow to the Bay. The Susquehanna River, which contributes about 50 percent 

of the freshwater to the Bay, annually delivers 

about 66 percent of the total nitrogen and about 

40 percent of the total phosphorus transported 

from the major river basins during normal flow 

years.

Correlations of annual yields of nutrients and 

sediments for normal flow years with respect to 

land use, physiographic province, and rock type 

indicates (1) basins with greater percentages of 

agricultural land produced greater nutrient and 

sediment yields, (2) basins in physiographic provinces where agricultural land is concentrated 

(Piedmont Lowlands, Piedmont Uplands, and the 

Great Valley) produced some of the highest 

nutrient yields, and yields increased as the 

percentage of agricultural land use increased, and 

(3) basins with the greatest percentage of forested 

land produced the smallest nutrient and sediment 

yields. Further analysis indicated (1) the highest 

total nitrogen yields from predominantly agricultural areas are from basins underlain by 

carbonate rock, and (2) mean annual yields of 

nutrients from predominantly urban basins were 

substantially less than the mean annual yields 

from predominantly agricultural basins and 

generally were less than the means for all 127 

load basins.

44 ~ SUMMARY AND CONCLUSIONS
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Data analysis was limited by "gaps" or deficiencies in the water-quality and spatial data sets. 

Spatial data gaps refer to deficiencies in areal 

extent and location, water quality and quantity, 

data-collection activities, and inconsistencies in 

resolution and definition in the GIS data sets of 

land use, physiographic province, and rock type. 

Temporal data gaps refer to the length of waterquality data-collection activities and interruptions 

in those activities.

Visual inspection of the concentration data 

indicated that water-quality data were collected at 

more sites in areas with higher densities in population centers and near main stems of major 

rivers, and less data were collected from headwater streams.

Significant temporal gaps existed in the 

nutrient- and sediment-concentration data 

collected at many of the sites because data were 

collected for short time periods, or continuous 

daily discharge data were not collected at or near 

the water-quality sampling site. Loads were only 

estimated for 12 percent of the 1,058 sites for 

which data were available for 3 or more years.

Visual inspection of the geographic locations 

of the load sites indicates that very few sites are 

located in the Juniata, the York, the middle and 

lower reaches of the James, and the nontidal 

parts of the eastern shore of the Bay. The 

drainage basins for the load sites averaged about 

486 mi2 and cover about 92 percent of the 

nontidal part of the Chesapeake Bay Basin. 

Drainage basins of the 127 load sites ranged from 

0.38 mi2 to 27,100 mi2 , and most were nested 

within one another.

No single land-use load site existed in the 

database. About one-third of the load sites 

contained greater than 70 percent forest land, few 

sites contained greater than 70 percent agricultural land, and no sites contained greater than 

70 percent urban land. Load sites were designated 

as having a "predominant" land use if they 

contained greater than 75 percent forest land, 

greater than 50 percent agricultural land, or 

greater than 25 percent urban land. Using this 

designation, nearly all the predominantly forested 

load sites (26 of 28) were underlain by siliciclastic 

rock. The other two predominantly forested sites 

were underlain by carbonate rock. The 25 

predominantly agricultural sites were distributed 

more evenly among rock type 5 in carbonate, 8 

in siliciclastic, 11 in crystalline but only one was

underlain by unconsolidated rock. Ten of the 15 

predominantly urban sites were underlain by crystalline rock. Rock type has been shown in at least 

one case (agricultural land use underlain by 

carbonate rock) to be an important factor in 

nutrient loads.

The ratio of the drainage area of load sites in 

a predominant land-use/rock-type combination to 

the percentage of the total drainage area in the 

Bay in the same combination was useful for identifying spatial data gaps. Nutrient and sediment 

data were available for less than 18 percent of the 

predominantly agricultural areas underlain by 

siliciclastic rock, less than 35 percent of the agricultural areas underlain by either carbonate rock 

or unconsolidated rock, and less than 35 percent 

of the forested land underlain by carbonate rock.

Not all nutrient species and suspended sediment were analyzed in samples collected from 

sites where sufficient samples were collected to 

estimate loads. Total nitrogen loads could not be 

estimated for most load sites for most years. 

However, total nitrogen loads, the sum of total 

ammonia plus organic and dissolved nitrate 

loads, were available for more load sites after 

1985 when additional data were collected in the 

Potomac and James River Basins. Total phosphorus load data from 1985 to 1989 for the 

Upper and Lower Potomac and Western Shore 

Basins was not available because of laboratory 

problems. Very little suspended-sediment load 

data exists in the Bay Basin except for the Lower 

Susquehanna River Basin.

Data analysis was limited by deficiencies or 

inconsistencies in available spacial data. The GIS 

land use data set classified cropland and pasture 

land together as one classification, thus 

preventing a differentiation of the two in data 

analysis. Inconsistencies in the densities of basin 

delineations from different states interfered with 

the comparison of the number of monitored 

drainage basins of a certain land-use rock-type or 

combination to the total number of similar, 

unmonitored drainage basins that exist in the 

Chesapeake Bay Basin.

The databases described in this report could 

be used in a variety of ways to provide further 

information to managers and researchers working 

to improve the health of the Chesapeake Bay.

SUMMARY AND CONCLUSIONS ~ 45
SYNTHESIS OF NUTRIENT AND

REFERENCES CITED

Berg, T.M., Barnes, J.H., Sevon, W.D., and others, 

1989, Physiographic provinces of Pennsylvania 

(2nd ed.): Pennsylvania Topographic and 

Geologic Survey, Map no. 13, Scale 1:2,000,000.

Cohn, T.A., DeLong, L.L., Gilroy, E.J., Hirsh, R.M., and 

Wells, O.K., 1989, Estimating constituent loads: 

Water Resources Research, v. 25, no. 5, 

p. 937-942.

Cohn, T.A., Caulder, D.L, Gilroy, E.J., Zynjuk, L.D., 

and Summers, R.M., 1992, The validity of a 

simple statistical model for estimating fluvial 

constituent loads: An empirical study involving 

nutrient loads entering Chesapeake Bay: Water 

Resources Research, v. 289, no. 9, 

pp. 2,353-2,363.

Correll, D.L, Jordan, T.E., and Weller, D.E., 1993, 

Relating nutrient discharges to geology and 

landscape pattern in the Chesapeake Bay 

Watershed A progress report and renewal 

proposal: Smithsonian Environmental Research 

Center, BSR-9805219, 26 p.

Fishel, O.K., Brown, M.J., Kostelnik, K.M., and Howse, 

M.A., 1992, Evaluation of agricultural bestmanagement practices in the Conestoga River 

Headwaters, Pennsylvania Description and 

water quality of the Little Conestoga Creek 

Headwaters prior to implementation of agricultural 

nutrient management: U.S. Geological Survey 

Water-Resources Investigation Report 90-4131.

Helsel, D.R., and Hirsch, R.M., 1992, Statistical 

methods in water resources: Amsterdam, 

Netherlands, Elsevier Science Publishers, 

Studies in environmental science #49, 522 p.

Lietman, P.L, Ward, J.R., and Behrendt, T.E., 1983, 

Effects of specific land uses on nonpoint sources 

of suspended sediment, nutrients, and 

herbicides Pequea Creek Basin, Pennsylvania 

1979-80: U.S. Geological Survey WaterResources Investigation Report 83-4113, 88 p.

Maryland Department of the Environment, 1992, 

Chesapeake Bay Water Quality Monitoring River 

Input Monitoring Component: Level 1 Data 

Summary Report: 1992.

Pennsylvania Department of Environmental

Resources, 1991, Pennsylvania's Surface Water 

Quality Monitoring Network (WQN): Bureau of 

Water Quality Management, Publication No. 33, 

121 p.

Pettyjohn, W.A., and Henning, R., 1979, Preliminary 

estimate of ground-water recharge rates related 

streamflow and water quality in Ohio: The Ohio 

State University Department of Geology and 

Mineralogy, Project Completion Report No. 522, 

323 p.

SAS Institute, Inc., 1990, SAS procedures guide, (3rd 

ed.): Gary, North Carolina, SAS Institute, Inc., 

version 6, 705 p.

U.S. Army Corps of Engineers, 1977, Chesapeake 

Bay future conditions report, Volume 1, Summary: 

Baltimore, Maryland, 125 p.

U.S. Department of Agriculture, 1982, Conestoga 

Headwaters Rural Clean Water Program 1982 

Plan of Work: Agricultural Stabilization and 

Conservation Service, Harrisburg, Pa., 61 p.

U.S. Geological Survey, 1984, National Water 

Summary 1984 Hydrologic events selected 

water-quality trends and ground-water resources: 

U.S. Geological Survey Water Supply 

Paper 2275, 467 p.

Williams, K.F., and Reed, LA., 1972, Appraisal of 

stream sedimentation in the Susquehanna River 

Basin: U.S. Geological Survey Water-Supply 

Paper 1532-F, 24 p.

46 ~ REFERENCES CITED
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 1. LIST OF WATER-QUALITY STATION NUMBERS, LATITUDE AND LONGITUDE,

AND STATION NAMES

APPENDIX 1 ~ 47
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names

Station Latitude Longitude Station name

01000500 

01501004 

0|S6i008

01502701

01503000

01508800

01508803

01509150

01512850

01518000

01518400

01518500

01518550

01518600

4139:32

414734

415030

415250

415430

415033

415408

415455

415438

415709

415825

415948

415748

: 41 4555

414245

413834

413348

413330

413053

413205

412742

414047

412923

412641

412411

412133

412038

411503

411651

770253

770444

770613

770705

770747

771632

770855

770842

770816

770656

771435

770825

754433

762628

762815

760940

755230

755342

755741

755655

755115

752820

753234

753840

753952

754441

754713

755252

755346

Susquehanna River at Unadilla, N.Y,.'

Mill Brook at Sherburne Turnpike at New Berlin, Miff.

Mill Brook tributary above New Berlin, N.Y.

Susquehanna River at Afton, N.Y.

Susquehanna River at Conklin, N.Y.

Factory Brook at Homer, N.Y.

West Branch Tioughnioga River at Homer, N.Y.

Gridley Creek above East Virgil, N.Y.

Chenango River at Binghamton, N.Y.

Susquehanna River (CFJ Bridge) at Johnson : ' Susquehanna River at Smithboro, N.Y.

Tioga River at Lindley, N.Y.

Canacadea Creek near Horaell, N.Y.

Canisteo River at Addison, N.Y.

Cohocton River at Cohocton, N.Y.

Switzer Creek near Cohocton, N.Y.

Fivemile Creek near Kanona, N.Y.

Chemung River at Wellsburg, N.Y.

Chemung River at Chemung, N.Y.

Tioga River above Morris Run, Pa.

Tioga River near Mansfield, Pa.

Tioga River at Lambs Creek, Pa.

Mill Creek near Tioga, Pa.

Tioga River at Tioga, Pa.

Crooked Creek at Middlebury Center, Pa.

Crooked Creek at Tioga, Pa.

Crooked Creek at Tioga, Pa.

Crooked Creek at Tioga, Pa.

Tioga River at Tioga Junction, Pa.

Cowanesque River at Nelson, Pa.

Cowanesque River near Lawrenceville, Pa.

Susquehanna River near Great Bend, Pa.

Susquehanna River at Towanda, Pa.

Towanda Creek at Monroeton, Pa.

Susquehanna River at Laceyville, Pa.

South Branch Tunkhannock Creek near Tunkhannock, Pa.

Tunkhannock Creek near Tunkhannock, Pa.

Bowman Creek near Tunkhannock, Pa.

Susquehanna River at Tunkhannock, Pa.

Susquehanna River at Falls, Pa.

Lackawanna River near Forest City, Pa.

Lackawanna River at Ridge Street Bridge, Pa.

Legetts Creek at Scranton, Pa.

Roaring Brook at Scranton, Pa.

Lackawanna River at Old Forge, Pa.

Lackawanna River at Pittston, Pa.

Susquehanna River at Wilkes-Barre, Pa.

Toby Creek at Luzerne, Pa.

48 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

01538600

01540348

01540500

01540823

01541000

01547500

01547950

01548075

01548095

01548340

01552000

01553150

01553480

01553500

01553700

411328;;": ^755^9; '""""'' : "^tWW 

ijillWii

410249

405650

405729

405206

405349

410212

410703

412002

412448

411902

773617

774209

772840

772201

773734

765446

765221

765330

765236

764050

Nescopeck Creek at Nescopeck, Pa.

Catawissa Creek at Catawissa, Pa.

Susquehanna River at Danville, Pa.

Chest Creek at Mahaffey, Pa.

West Branch Susquehanna River at Bower, Pa.

Moshannon Creek near Moshannon, Pa. 

West Branch Susquehanna River at Karthaus, Pa. 

Bennett Branch Sinnemahoning Creek at Driftwood, Pa. 

Driftwood Branch Sinnemahoning Creek, Sterling Run, Pa. 

Sinnemahoning Creek at Sinnemahoning, Pa.

Bald Eagle Creek at Blanchard, Pa. 

Beech Creek at Monument, Pa. 

Fishing Creek near Cedar Springs, Pa. 

Chatham Run, 220 Bridge at Charlton, Pa. 

Pine Creek at Galeton, Pa.

Hunter Drift Discharge near Antrim, Pa. 

Basswood Run at mouth near Antrim, Pa. 

Wilson Creek at Morris, Pa. 

Unnamed tributary to Paint Run near Morris, Pa. 

Stony Fork near mouth near Blackwell, Pa.

v.ttwy^Wj

Loyalsock Creek at Loyalsockville, Pa.

White Deer Creek at White Deer, Pa.

Buffalo Creek at Lewisburg, Pa.

West Branch Susquehanna River at Lewisburg, Pa.

Chillisquaque Creek at Washingtonville, Pa.

APPENDIX 1 ~ 49
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

01555251

01555252

01555500

01555600

01556010

01565515

01566010

01567000

01567350

01568000

01570230

01570260

01570280

01570300

01570500

01572000

01572200

01573205

01573560

01573610

764821

763504

770255 

770242 

765211 

764857 

765016 

765444 

765739 

781039 

781742 

M78 M 15 

3780827 

780811 

780109 

783321 

782934 

782839 

781556 

775607 

775136 

773540 

773500 

773401 

773355 

773327 

772332 

770746 

770156 

771009 

770456 

: 773235 

770611 

770117 

1 765835 

765755 

765751 

765700 

765657 

765311 

765100 

771043::"

Susquehanna River at S^iaburyi $&41 l;l i;i: - ( f E ^ l >» j i III fll/iYi

otiamokiti t_reek near Alianioltiii, J/a, \ \ j1 ; OPI : : yn- $ 1 j 1i c.ioj.ij

PennsCreefc at .Penns:Creefc, ! Pa,: : * ; >" s ' :>.11^i H S!!IM^llifl

Middle Creek" at: Middleburg, Pa. ^ \\ \ ( = 1,;' ff.f' >:: I' 1 ^. u| | J !|

Middle Creek near SelinsgroveN P'a.

Mahanoy Creek near Herndon, Pa.

Mahanoy Creek at Herndon, Pa.

East Mahantango Creek near Dalmatia, Pa.

Wiconisco Creek at Millersburg, Pa.

Frankstown Branch Juniata River near Williamsburg, Pa.

.Little Juniata River at Tipton; Pa, M M v ' j 11 ; : ^ 1 1 1 i {^l^yj

South Bald Eagle Creek on Rt. 3^! JW^j^t;.tJIAI4|^.|ftiI

Little Juniata River at Spruce Creek, Pai

Little Juniata River on State Rt. 45 at Spruce Creek, Ja.

Juniata River at Huntingdon, Pa.

Bobs Creek at Reynoldsdale, Pa.

Dunning Creek at Belden, Pa.

Dunning Creek near Bedford, Pa.

Raystown Branch Juniata River at Saxton, Pa.

Juniata River at Mapleton Depot, Pa.

Aughwick Creek at Aughwick Mills, Pa.

Honey Creek at ReedsviUe, Pa.

Kishacoquillas Creek at ReedsviUe, Pa.

KishacoquiUas Creek at Bumham, Pa.

KishacoquiUas Creek at Lewistown, Pa.

Jacks Creek at Lewistown, Pa.

Tuscarora Creek at Port Royal, Pa.

Juniata River at Newport, Pa.

Little Juniata Creek at Duncannon, Pa.

Sherman Creek at Shermans Dale, Pa.

Sherman Creek'near Dundannorij^Pa.; :; M : : i; t > ; : ' H'm i -1 1III III

Middle Sprmg Creek near ShippensburgJ Pa.

Conodoguinet Creek near NeW Kmg|ti>pM'|>^> I \^ J I ;j 11; 1111

Conodoguinet Creek near Hogestown, Pal

Conodoguinet Creek tributary niiinbiE^2f^^^)l||(||^f|^f|-ii

Conodoguinet Creek tributary number 2A near Enola, Pa.

Conodoguinet Creek tributary number 2B near Enola, Pa.

Conodoguinet Creek at Enola, Pa.

Conodoguinet Creek tributary number 3 near Enola, Pa.

Susquehanna River at Harrisburg, Pa.

Paxton Creek 'near Penbrook, Pa. M ;. ilr p ' : u ; ; ' j 1 1 p||j: )

 Mountain Creek at Mount Holly SpringSjtfH.;; '*°i'iW'f !'|| |N|

Yellow Breeches Creek near Camp Hill, Pa.

Yellow Breeches Creek at New Cumberland, Pa,

Swatara Creefc at Ravine, Pa.

Lower Little Swatara Creek at Pine Grove, Pa.

Swatara Creek at Inwood, Pa.

Quittapahilla Creek at Syner, Pa.

Swatara Creek near Hershey, Pa.

Swatara Creek at Middletown, Pa.

50 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

WQN0202 

WQN0203 

WQN0204 

WQN0205 

WQN0206

WQN0212 

WQN0213 

WQN0214 

WQN0215 

WQN0216

WQN0224 

WQN0225 

WQN0226 

WQN0228 

WQN0229

402834

403214

403640

404629

405200

765312

764821

762134

761639

763133

781039

765739

765443

765211

770255

!V¥est iCfeaewagd; CJitefc near M;aa<tie|st4f j J|ah .r : ' 

Braneh Codorus :Cf0Nkiiat::Sitofersi0Mt»^::

Codorus Creek at Pleasureville, Pa. 

Chickies Creek at Marietta, Pa. 

Susquehanna River at Marietta, Pa. 

Little Conestoga Creek, Site 3a, near Morgantown, Pa. 

Little Conestoga Creek near Churchtown, Pa. 

Gonestoga River at l^aricastery Pa. j -; .MM I :i f ;yN I I i. i 1 1 ^ I i .i 

Mill i: CJreek;; near; Leola, Pa; : ; : ; n.I;: 'i i; i ; i {( ! ; i. t 1 i i; 1 1 i 11 > l: 1 ; ;: ; jiGoyriestoga River near Coriestdgay P4I Ii i; ii i; ii; i| ;| ii; ii;.;;; t ii; :;i i;: i 1 ]' ii ;|. 

Cbnestoga River at Coiiestog^, iPfe'; {1 ' i I UMI I ii i il I; i 11 V| 

Pecjiiea Greek Tributary, Site ;1;,;'atr.Str^spp:!1^!i^fcrryV;; :<- Pequea Creek Tributary near Martic Forge, Pa. 

Pequea Creek at Martic Forge, Pa. 

Pequea Creek Tributary near Mt. Nebo, Pa. 

Pequea Creek near Martic Forge, Pa. 

Susquehanna River at Holtwood, Pa. 

Bald Eagle Creek near' Fawn <3tfo:?e| fffl.;; ;i I j:[.i 1 i i i i:; j. i i i 

Bast: Branch Octorarp Creek i at i CJririgiiaA^:;l^4.| ii: i: i; ii!!: ;i I % 

V:aliey:: Creek riear; ^itg*^W;* !^-;:: ? ; M ;.;;.;;;;.; 11;:; i i ; ^ ^ i : ;;;:; 

Bbaughs; Creek near StewartstoWB, Pa.;; i! |i;{ 111 :l i- : i; i i: f'j i 

Susquehanna River at Marietta 1 1111111111 1 i;.; 1111 1 '< {i : i i 1.. 

Susquehanna River at Harrisburg 

Bainbridge Street Bridge in Sunbury 

Pequea Creek in Martic Township 

Conestoga River in Lancaster 

Chickies Creek at Rt. 441 Bridge 

Godoirus Creek at LR66021 : Bridgei = 111 1 11111 f M: l'vy'i : ii i 1 ;ii:i : 

West BranchiCb<ioWS'at iM4itpn;ii:;lii;^l :i ::;iiyiiy'i;iliii;ilv j|i|i| 

South Brancli Codorus at 

; ; Westl Cionewagp: Greek ^ ;R|.i: lit; Bridge i/iJilyiliJii; 

iSwatara; Greek ;in :lli4i<ldleto:^i(ii i; h i.; : i. il 11 -; 111 1-| SI. If! 

Yellow Breeches at New Cumberland 

Conodoguinet Creek at SRI009 Branch 

Juniata River at Newport 

LR31084 Bridge at Mapleton 

TRA135 Bridge at Huntingdon 

At; Pa, 45 Bridge at; Jlpniee Greek \ ; 11111 It f vf f 11;

'Gauge: station! in; Snyder To^vnlhrlJll; 1 1,; M I i: ;i lil : l l : ;! 

^USf 52i::Bridige|;at; Lewistown||; l: i : M' : ; 11 1 11 ;j ;j i'l.li fy 

iiPJR^I^BirJ^ ^illl;;;: ].] i 'hi I !i!y'Viiyi!' : i :! i'y

PC Railroad Bridge in Woodbury Township

Wiconisco Creek at Millersburg

Mahantango Creek in Upper Paxton Township

US 11 & 15 Bridge in Penn Township

Penns Creek at Penns Creek

APPENDIX 1 ~ 51
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

WQN0249 

WQN0250 

WQN0251 

WQN0252 

WQN0253

WQN0317 

WQN0318 

WQN0319 

WQN0320 

WQN0321

402005

400126

400850

402554

403917

39409

394623 

401316 

395156 

400121 

394224 

403546 

405729 

411 119 

=1412100' 

; -41 3830 ' 

i M|4555i 

> ;4l5'fi8i: ; 

405650 

405942 

410250 

410417 

411415 

:;411651 

4;|2l3;3 1 

:: ',4130J5 

:;4j4f i4

413329

414245

415430

415916

415438

775136 

782839 

783321 

782130 

773500 

763550 

762410 

'?64857 : . 

761859 

771532 

760640 

771831 

760657 

773424 

763610 

7605 13 

: ' 754805 ; 

760940 

; 762628 

754433 

762721 

762825 

761312 

760802 

755638 

755346 

755342

762814

770747

770854

771215

Jtec. station in Shamokin Township 

: Conestoga ;Rlver 

; Susquehanna 'River at ;

Mill Creek near tfoJa M^iy // f :n W&I^A 

, QuittapaftiUa Creek at 'Mouth? |i j; ; ;'M j; ^ i ] f; ) : i| : .;'/

Mountain Creek near Mt. Holly Spring

Conodoguinet Creek near Enola

Middle Spring Creek near Shippensburg

US 522 Bridge at Middleburg

Shermans Creek near Duncannon

Little Juniata Creek m EHmcannpn 

; .PR333 Bridge :at Port; Royal [, ; ! ', 1 1 ii.^ jj I ^ [j] : 

: ^US 22' Bridge at Lewistown" : ; ' : : : }i* // (:! : ;'-yi i : S M v Kt[

LR44002 Bridge in Bumham'Bo|-o' '? \ '\ 1 1 ;i s i'^ :! i;

Old US 322 Bridge atReedsvile: : : i : "> I : : J ^H

TR403 Bridge at Aughwick Mill

Railroad Bridge off TR 477, Bedford Township

LR05060 Bridge at Reynoldsdale

At Mouth in Blair Township

Old US Rt. 322 Branch in Brown Township

Ebaughs Creek in Hopewell Township

T-410 Bridge in Pine Grove Township

T377 Bridge in Jackson Township;:;- ; ; ft l "> : ? L :'J:

SR2Q24 (LR66062) Bridge, Peach Bpttdni

T427 Bridge^ Lower Prankfbrd Township

SR0472 (Pa. Rt. 472) Bridge near Black Rock

T340 (Pine Grove Furnace), Cooke Township

Bridge on New Bridge Road near jet. Horseshoe Road

SR3001 (Main St.) Bridge at Lewistown

PR54 Bridge at Danville

PR1 1 Bridge near Retreat State Hospital

Coxton Railroad Bridge, in: Exeter ,'

Bridge .on LR63041 r j j ! l : i \ I ] ] ' j 1 1 1 ; ; : f j ! i 

: Bridge on Rt. 6 at Towarida ^\ :r'h 1 1 "J

Rt. 11 Bridge'' ' ' ' ' ' : ' ' ; ; : : : ^ < j : ; ,;:

PR42 Bridge in Catawissa Township

PR44 Bridge in Hemlock Township

Bridge on LR40017

Rt. 29 Bridge in Conyngham Township

Solomon Creek near Buttonwood 

. Grove StL Bridge, Pringle .Boro . . . < i l^^ : 

 Bridge St. Brid|| in

Pill 71

Legetts; Creek .at'-Sefanibn N = : ' : ; .- :: ; ; : ; ;' j ! . Bridge on Rt. 6

Towanda Creek at Monroeton

Bridge on Rt. 667

Cowanesque River near Lawrenceville

Crooked Creek near Tioga

52 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

WQN0327 

WQN0328 

WQN0329 

WQN0330 

WQN0331

WQN0401 

WQN0402 

WQN0403 

WQN0404 

WQN0405

WQN041 1 

WQN0412 

WQN0413 

WQN0415 

WQN0416

WQN0423 

WQN0425 

WQN0426 

WQN0427 

WQN0428

WQN0436 

WQN0437 

WQN0438 

WQN0439 

WQN0440

412416

413053

413339

412038

410027

415656

414724

414149

414950

:;4i,2457:

405802

411344

411926

410703

405741

405349

411455

411931

412506

411659

413118

410331

405831

405323

405427

411541

Bridge, on rus: ;R|, y \ i s s , y:; ; : " ; y y y v y ? y y y ; y: y v y ^ ,; 1 H ' H ;j y; ;.

Cedar Avenue Bridge 

Bowman Creek near Tunkhannock 

South Branch Tunkhannock Creek near Tunkhannock 

Lackawanna River near Pittston 

Black Creek at Tank 

 Cheniung River near Athens I,, ] I \ 111 ] 11 1J1:1; y ;; J1 y 11 ; y; i y \ 

:.:SJ107Q6' (Pa,; Rt,706) Bridge a;t::WerryaE 

SR0467 (Pa. Rt 467) 

T310 Bridge near Stall, Noxen 

West Branch Susquehanna River 

Maynard St. Bridge in Williamsport 

Eighth Street Bridge in Renovo 

PR879 Bridge in Karthaus Township 

PR453 Bridge at Curwensville 

T-418 Bridge in Greenwood T^lroltft 

US 220 Bridge ne£

PR973 Bridge at Loyalsbckvilleyi I = y;:: ;:: TR840 Bridge in Lewis Township 

PR44 Bridge in Cummings Tpwii$hi|) 

TR762 Bridge in Brown Township 

First Bridge below Sayre Dam 

LR14010 Bridge at Curtin 

LR 14040 Bridge at Bellefonte 

Willowbank Street Bridge, Bellefonte 

jLRiloM Bridge :a1 ;:Sinnenlahoiiing:;: f y f 

PR 120 Bridge near Sinnemfthbmng 

:LR12004 Bridge in ,L|unil3erfii^O|4n^h;ip; 

Railroad Bridge at Osceola Mills 

LR 17038 Bridge in Boggs Ty(|Mi|iiHip 

US 220 Bridge at Beech Creek 

PR54 Bridge near Washingtonville 

US 15 Bridge at Lewisburg 

US 15 Bridge in White Deer 

Loyalsock Creek near Forksville 

PR44; Bridge-; at :Waterville ; ({I : y y y j j j 

Pin^ ;C:reeky;:near.Ansonia ..:;;;.;;;; : ;;: : : : 

,East of Galeton On.; US; Rt,1 ^ I:; i B U ( I 

LR18007 'BridgeyneM Cedar: ;Si3i)iUi| j j 

Rec. station in Leidy Township 

T-324 Bridge at Mahaffey 

PR555 Bridge at Driftwood 

LR 17062 Bridge near Kylertown 

T343 Bridge south of Driftwood 

Meadow St. Bridge in Curwensville

APPENDIX 7-53
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

EKP219 Bridge near Mbshannon

Marsh Creek, Shlppen Township

SR2014 (Old Rt. 147) Bridge/Muncy Creek Township

SR2012 (LR18013) Bridge at Castanea

Nanticoke River near Bridgeville, De.

Nanticoke River at Middleford, De.

Broad Creek at Laurel, De.

Marshyhope Creek near Adamsville De.

Cypress B near Van Dyke, De.

Cypress 1 B at Delaney Corner, De. ' ' : :. \ : ;; ;i 1i1 M'V v;

01594440

01594526

01594670

01594675

01594710

01595800

01600000

01603000

01614500

01619500

01645784

01646580

01647685

01647720

01647725

752040 Davis D at Careytown, Md. :: ;: ' : : . j ;},: : :! ' : :/;: li 11 f.;

753411 Beaverdarn Creek near Salisbury, Md,

754710 Choptank River near Greensboro, Md, |

755543 Chester River Tributary at Chesterville, Md.

760054 Morgan Creek near Kennedyville, Md.

761031 Susquehanna River at Conowingo, Md.

763836 Jones Falls at Lake Roland Dam near Baltimore, Md.

763734 Stony Run near Mouth at Baltimore, Md.

763643 Jones Falls near Mouth at Baltimore, Md.

770323 Patuxent River near Unity, Md.

770025 Patuxent River Tributary near Dayton, Md.

765607 Agricultural Runoff Site near Clarksville, Md,

764858 Lower Patuxent River at Savage, Md.

764136 Patuxent River near Bowie, Md.

764452 Western B at Upper Marlboro, Md.

763620 Hunting Creek near Huntingtown, Md.

763705 Agricultural Runoff Site near Huntingtown, Md.

764408 Killpeck Creek at Huntersville, Md.

763040 Agricultural Runoff Site near St. Leofiard, Mdv

762424 Agricultual Runoff Site 1 near Lexington Parki Mdi

792543 Laurel Run at Dobbin Road near Wilson, Md,

792507 South Fork Sand Run near Wilson, Md. ) j |

\ 792436 : North Fork Sand Run near Wilson,1 Md;, \ \ 111 l HKiiil If

790639 North Branch Potomac River at Barnum, W. Va.

785025 North Branch Potomac River at Pinto, Md.

784624 North Branch Potomac River near Cumberland, Md.

774928 Conococheague Creek at Fairview, Md.

774352 Antietam Creek near Sharpsburg, Md.

7f|3235 Potomac River at Point of Rocks, Md.

77i4!J6 Mbnocacy River at Bridgeport, Md.

771410 Big Pipe Creek at Bruceville, Md.

772240 Monocacy River at Reichs Ford Bridge near Fredeflcfi

772013 Seneca Creek at Dawsonville^ Md. I

772043 Snakeden Branch at Reston, Va.

770702 Potomac River at Chain Bridge at Washington, D.C.

770548 Williamsburg Run near Olney, Md.

770609 North Branch Rock Creek near Norbeck, Md.

770600 Manor Run near Norbeck, Md.

54 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

1G

13A 

15001.4 

15002.0 

15006.0

20051

20060

50010

50033

50035

A15

A17 

A4 

A7 

Bl

CH0365

DIF86

GOO238

KNG01 

PIM15

RWCC

SUG442 

TBK01 

TCO01 

TCO06

384051

384104

390356

390400

390522

390211

390742

385900

385915

390020

770B5 

770024

77^37

: 770311

791545':

771035

770937

772100

772348

772800

772030 

772011 

770000 

765900 

770000 

765800 

770141 

765834 

765500 

765500 

765200 

765400 

765700 

765600 

765400 

1 77264:1 

j 772604 : 

! : 772630 . 

1 77261 lh 

773350 

772142 

771433 

773033 

765640 

770706 

770701 

: 770223 

771945 

770350 

770259 

772200 

772147 

770715 

770430 

770606

"Nursery. Rimy atyCiloterlyi $j$4.i

. Bei lifMb"; Creek at :ia^iiiiis : ;Md.j \ : ii i \ :/:.. :; : :: :: 1 1 

; Stony; River^ar^Mibiiiiti pt^w! |] : : m'; - v ;? 1 1 !

Pohick Creek

Accotink Creek

Potomac Basin/Seneca at Midstream

Potomac Basin/South Van Deventer Island

Potomac Basin/North Selden Island

:.l|sjnt>ea:e|?8iiii'er: at i

Potomae Basin/Mouth

Potomac Basin/g Seneca CreeM

Potomac Basin/1 Seneca Creek below Rt. 28

L Seneca Creek at Potomac River

Sligo Creek near Washington Hospital

Potomac Basin/Long Br. near Carrloo Avenue

Long Branch above East Wayne Avenue

Northwest Branch at Old Rigg Road

Nw Br, at Randolph Road/Anaco^lia iWW

 Anacostia Basin/Paint Bit:.: at pair i Skjati 1 1 : i| f I i: y

Little Paint Branch at Beitsvilleyt;; i 1 |Tj$t|i l|i I

Indian Creek'at Greenibelt Roail: [ i': : i J i 1 f;! 11 :M I

Beaverdam Creek at Research Road

Indian Creek at Sunnyside Road

Nwr. at Wueen's Chapel Road

Ne Branch at Riverdale River.

Lower Beaverdam Creek at DC Bor.

Chopawamsic Creek

Difficult Run

Goose Creek

Kingman L.e.cap.st. Bridge w.

Pimmit Run

Potomae RiyeflCiiarri Bridge:! I \ 11 >' M M N ^ ::;:'.i \

Coittst.Avenu:e BrMge M',; 11 M.; : i, ''i ! \.( . [ ; i: 11j:;;

Quantico : Creek : M ; : l:; ' . ; '' ! ii ;i i'l j N\; :::IS i ii I \ i; i; :

R; ock Creek./Meadowbrobk iLecv' t^id)^^ @ I n\

Conn.Avenue/South Bridge i i H 11 S S! y kii i; i; ii

Intake at Senecca Pool

Sugarland Run

Canl Road, northwest/Fletc. Boat

Potomac Basin/just west of 27 St., northwest

Potomac Basin/Fletcher"s Boathouse

APPENDIX 1-55
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

765836 

770500 

765615 

765730 

765830 

765745 

765630 

770228 

765820 

165810 

7656*5 

'765454: 

765456 

765431 

790501 

765631 

765638 

774355 

774240 

1 773631 

1 ,762922 

: 784728 

765325 

765400 

754901 

763841 

763845 

760404 

771419 

761510 

J753414 

773450 

773333 

764707 

755431 

755445 

754712 

770857 

765219 

764448

J, End of Wetherill Road 

Railroad Yard under Anaeo. FWY 

Potomac Basin/4300 Block of Cathedral Avenue 

Texas Avenue/Creek St., southeast 

Pennsylvania Avenue, 33rd St., southeast 

1900 Block of Good Hope Road 

North side Bridge on H. Lane 

Anacostia Avenue Northeast 

Potomac Basin/100 yards below Audrey Lane 

Fairlawn Avenue M St./M PL, southeast 

Texas Avenuevtf7th St., southeast i J : -.; j j / i i \ 1 1 -; 

Kenilworth Park, Watts Branch 

Watts Branch/61st St., southeast 

Watts Branch/61st St., southeast 

Watts Branch

Aaron Run just above its mouth 

At bridge on Md. Rt. 234 

At bridge on Bladensburg Road 

At gaging station just below Burnside Bridge 

At bridge on Poffenberger Road near Funks 

At gaging station West of Md. Rt. 60 at Rock 

At Bridge on Eastern Avenue (Md. Rt. 150 

Braddock Run above mouth near Jet. US 40 

Midchannel under power lines near the mouth 

Rt. 91 crossing, 0.6 mi Southwest of Finksburg 

Md. 281 crossing 

Beaver Run Lane, wooden bridge 

York Road Crossing 

At bridge on Shorters Wharf Road 

Bridge on Maryland Rt. 194 

At bridge on US Rt. 40 

At dam on Schumaker Pond just off Schtuna 

Near mouth at bridge on Md. Rt. 464 

At bridge on Md. Rt. 17 at gaging station 

At bridge on Md. Rt. 234 

Midriver Md. 290 Bridge Crossing Chester 

Mid River off Ganey's Wharf, below Tucka 

At Red Bridges near Sewell Mills 

At Bridge on Macarthur Blvd. 

Ivy Mill Road Crossing 

Leeland Road Crossing, South of Leeland 

Above Sewage Lagoon 

Lower Beckleysville Road X-ind, 0.3 mouth 

Broening Highway Bridge 

Md. 68 Bridge

At gaging station 0.7 mi above bridge 

Northern Parkway Bridge 

Cooks Lane off of Franklintown Road 

Bridge on Stafford Bridge Road 

Bridge on US Rt. 1

56 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

393926

393929

393932

393915

392451

Bridge on Cherry Hil Road

1 Access i fi:0i» KltzrMlier . ori !W.fi Va, nRt fi #2 

Loch;; Jl^ii^qai^t 

: : tebaiighs ;<^eel|: W: Harris 

Elklick Run just above its mouth 

Marlboro Pike Bridge 

Access road south of Md. Rt. 408 

Along Parsonage Road, 1 mi WSW 

Just north of Dulaney Valley Road

b anfe at FfankiBri l \:\! | \ j] \ \ Uj : r f I: |

Run; ,i midcharinelfi r J ^ t fi fi I V: } } .fi i : fi; 

i George's . RuoJ rnidc^anriel I : ;. 1 1 ; fi 9 i fi fi :: fi; ;; i i fi . 

iGeorge'sfi Run, bridge om unnaiiiedfi VtiiltM^^i 

50 feet below Manchester Stp Outfall Point 

Just above Manchester Stp Effluent 

40 ft upstream from Dutterers Effluent 

Upper Beckleysville Road Crossing 

Bridge on Old Philadelphia Road Rt. 7 

At bridge on Cromwell Bridge TRoad 

500 ft above Main Loch Raven t>ara ) 

Loch Raven Res, at Loch Raven

.Loch' Raven ^Res, fiDulaney;: Valley:Rofia4|; fi i; fi jVh | fi fi ;:fi; ; | :i fi fi ^<\\W^ 

Loch :|R:aven Res. Merryrnans iMill; Roafidh \ " : ^ ': i fi fi h : ; \ fi fi i) 'M. 

Loch Raven Res. Ashland Avenue Crossing 

At Bridge on Phoenix Road (Philpot Road) 

End of Glencoe Road at Old Bridge Cross 

Bridge on Big Falls Road

At bridge on Falls Road downstream from Prettyboy River 

:Abovei rnouth of Georges; 

^idchanne! : under iC^ii^ 

i Bridge at Gunpowder -Rb; adi 

Bridge enfold1 ^o^^ 

;0nder:fiRussell.;St catossing n M .'; /fifi i fi 1 1 ; fij 1 fih;* 

Off Wilkens Avenue near Brunswick St. 

Just below Confluence with Dead Run 

Just above Dickyville Dam-in Impounded A 

Purnell Drive near Gwynn Oak Avenue 

At Bridge on Essex Road in Villa Nova 

fiBride 'at Q14;<Jourt Road : ' : : ; : ; ' I |: : :; |:| 'hfi;

Crossing.:

Under North Avenue Bridge

Near the intersection of Falls Road/Clipper Mill

100 yards below Kelly Avenue Bridge

At end of Appleby Avenue off Falls Road

From pcrr abandoned bridge near 1805 Ind

APPENDIX 7-57
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

MOR0040 

MRH0058 

MRM0001 

MXT0021

NAN0302

NBP0326 

NBP0461 

NBP0514 

NBP0534 

NBP0597

 7$ 1137.

 770708

765407

754156

772631

772134

772206

772250

772323

771407

763148

763200

765347

765614

765719

754743

763522

7651 1 1

754315

752820

':795009: ;

784354

784626

178455 1 ;

785021

785819

790248

790406

790639

791047

76282:6

765333

765248

765243

765325

765240

765258

765203

765257

Ivy MilLRoadterossm^nortiiof Cocke^^

At bridge oft Greenbriar Road near Sewafd

Off Wards Chapel Road below Confluence

Md. 279 Crossing . . ' V/N V ^J

Bridge on Md. Rt. 7

Bartholow Road Crossing, 1.5 mi NW

Dulaney Valley Road, 0.1 mi N of Semin

Downstream of US Rt. 1 Bridge at gaging station

Midstream at the gaging station upstream

Bridge on Mason 'Branch 'Road I ; " i i 'i : ; 'I I ? M'I il IU

500 yards' NW of Sweden Pi Marina ; : f ' ! 1 ; ;i ; ' j f j' - Md. Rt. 225 Crossing ' \ : : C^^'-'^H

Fire Trail near end of Bollinger Mill Road

Previous code Mnk0141, Rt. 13 bypass crossing

Bridge on Maryland Rt. 28

Bridge on Reels Mill Road

Jug Bridge US Rt. 40 West USGS gaging station

Bridge on Gas House Pike

Bridge on Biggs Ford Road

Bridgeport Bridge on Md. Rt. 140: tJ$^'.$^t

At Maryland Manor pumping station Biddle/62

Radecke Avenue Bridge

Morgan Run, midchannel

Midchannel at Md. Rt, 32 crossing

London Br Road Crossing, 1.2 mi Southwest of Gambe

At bridge on Md. Rt. 14 near Brookview

Dulaney Valley Road Crossing

Murray Hill Road Crossing

Mid River at Old Sharpstown Bridge

Md. 1 2 Crossing1 at ..gaging staf i pr| |i f / : ! | ' | ' : \ j j / 1 f i J j j j /;[|: | : j if

Toll Bridge : at Oldtown^ j ; : " * ' :- \ i V H 1 1 1 , ^j J ;;l J ',-IJ^M IJM

West of Intersection of Modreshollow ]^6a|l

North Branch at Wiley Ford Bridge

Ridgley Bridge . ' ; - \ : | : i :; . I \ , : ; i J '( ' ;l : ;: ^

USGS gaging station near W. Md. Rr Bridge

At Bridge on US Rt. 220

North Branch at Piedmont Westernport Bridge

North Branch at Bloomington Upstm of Con

USGS Gage at Bridge at Barnum

0.6 mi Downstream of Md. 38 Bridge Of ernorti

Golden Ring:Rbad Crossing ; ' ;' i \ i: . i ' ; : :- 1 1 f ;; i f j'f ;= f

1 ,000 ft above! fciberly fDain1 : : : \ ; ' : ; : ' I : '' ! j ' : ' f ! 1 1 "H ; ' Adjacent to Wiater Intyke Gatehouse, Liberty

North Branch Patapsco, midchannel

Upstream of Morgan Run Mouth

Midchannel at Deer Park/Nicodemus Road

Midchannel above Mouth of Keysers Run

Midchannel just below US Rt. 140

Bridge at Md. Rt. 91 near Gage

58 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

PAT0107 

PAT0112 

PAT0176 

PAT0285 

PBH0015

PIU0051 

PIU0065 

PIU0083 

PIU0084 

POK0014

POT 1472 

POT1595 

POT 1596 

POT 1830 

POT2386

PXT0494 

PXT0603 

PXT0630 

PXT0809 

PXT0972

SCC0023

SEN0008

SIE0006

SMR0120

SOU0004

764739 

764841 

764956 

765012 

753823 

7534i;8 

752340 

751930 

770833 

773118 

773121 

773238 

773253 

774811 

781036 

782717 

764652 

770121 

764206 

:764234 

764245 

764140 

764220 

765231 

770323 

770348 

790406 

790729 

763548 

765448 

764331 

772024 

764553 

763018 

783519

Above Congaleon-nair at Railroad Crossing 

Below Confluence with Roaring Run 

Ivy Mill; Road; Crossing I ;;;; ;; : ': i ; i ' ; ;;;; i;;ii; i : ;; 

Just above Confluence with Nortl Br 

At Porter Bridge gaging station near Ris 

At South Hanover Street Bridge 

Patapsco Avenue Crossing 

At Bridge on Washington Boulevard 

At Bridge on Md. Rt. 99 near Hollofield 

Traceys Store Road Crossing, 1.4 mi north 

'Just; above; Dike near Mouth : : i 'i i. ; \ \ \ ; i; : ; ::i i \ ; i. ?i; \ 

\ Rt. 210 'Crossing :; i; .i : ?! ''* ] \ ! : i i. i : ; ; ; ; i i;;i n s ;:; [ i : i,.:'. 

USS Navel Reservation Road Crossing 

Piscataway Road Crossing, 0.1 Mi from Ro 

At iMantua Mill Road Crossing 

Bridge on Mt. Zion Road 

Bridge on Trenton Road 

0.25 mi South of Md. Rt. 88 on County L 

Uppermost Portion of Channelized Section 

At Piers at Shelltown 

Center of Original Bridge in Pocomolce 

Bridge on Md. 12 : Y ' : j ' J ' i:i i 117'i ; ' U ;V^ : Md. Rt, 346 (Old Rt. 50) at USGS gagWg (station 

At gaging station just above Little Falls 

At Eastern Terminus of Whites Ferry 

Western Terminus of Whites Ferry 

At bridge on US Rt. 15 near Point of Rocks 

Potomac River/Va. side Point of Rocks 

At gaging station below bridge on Md. Rt. 3 

At gaging station 0.5 mi below bridge 

At bridge on Md. Rt. 51 near pa^w P^w WJ 

Upper Beckleysville Road Crossing 

Md. 6 Crossing ..;... i ij IM : ". . i/iM;;:,. 

Mid Channel at Nottingham^ 36 ft 

Just below Confluence with Western Branch 

At bridge on Md. Rt. 4 near Waysons Corner 

At bridge on US Rt. 50 

Patuxent River, at bridge on Rt. 3 

At the gaging station just below Rocky G 

At bridge on Md. Rt. 97 near Unity Gage 

At bridge on Md, Rt, 410 

: Savage'River; iat Md. 135 ;;: . : : ;.: :: ; : | :i N: ' M ; 

At gaging station 0.7 mi below Savage Ri 

Dulaney Valley Road Crossing 

At bridge on Henryton Road 

At gage near bridge on Md. Rt. 242 

At bridge on Md. Rt. 112

Slab Bridge Road Crossing, 0.5 mi NW of Rockd 

At gaging station near bridge on Md. Rt. 

0.4 mi from mouth off Stickley Road

APPENDIX 1 ~ 59
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

TUK0022 

TUK0133 

UDI0005 

UDJOOOO 

UDN0009

UFD0011

UFM0004

UFT0007

UHB0008

UHKOOOO

UPS0004

UQQ0005

UQQ0007

UQT0001

UQW0001

UWS0001 

UYU0003 

UZM0007 

UZM0016 

UZM0017

394055

392647

393919

392630

390845

390734

392355

392354

384545

384617

764519 

763543 

764428 

763415 

771857 

Iil905

UKS0001 

UKT0004 

UKT0008 

UNP0002 

UOK0001

770056

763855

763855

765036

765032

^ |age:: ||4&r : lapdge 

I j^::b: ridgb;: 'tot l^st^i 

At bridge on Md. Rt. 328 

Bridge on Rt. 404 

0.2 mi N. Sha Garage on Rt. 408 

Just above first trib above Schaeffer Road 

30 ft right of Bryants Nursery Road

'

: Cotter

Cotter Road Crossing, 0.3 mi Nw Flintstone Road 

Dulaney Valley Road Crossing 

Mt. Carmel Road Crossing near Junct. W/Spook 

Between Smallmouth Hotel and Peach Orchard 

Mouth of first trib entering Urg from the N 

Schaeffer Road Crossmg,i:first;

'Mouth; of first trib entermg' llr^-j 

: Mouth: ; of prst tr ib i:entering ; Urg =

: Mfst road iwest 'New Hampshire:; Avenue^ $,. -of; Wdi i I ' 

Below confl. of tribs draining sludge di 

Brown Station Road, 0.7 mi south of Broo 

0.6 mi NW Rt. 408 next to old RR 

Glen Falls Road Crossing of 1 st tributary north of Rt 

300 ft down road right of Bryants Nursery River

Esoiith: ;ot ||od|;:poa<|::; I }^.|| iSJf iftlliij 

to^iMO,^^

!^i

§' tieiar ' end of Fotspraig^oail;- j ' H; | ; || ^ ! -1-ff ^ilf ll

Crossing Old Orchard Road 0.15 mi from Ednor

Bridge at Circle Road

From Roland Run at Circle Road Bridge

Access P-4a Sludge Disposal Site

Access P-4a Sludge Disposal Site

; Road ; V: v ; ; ^r^Wl I lW'i

t^ 

^ : : '

Seminary Avenue Crossing

Upper Beckleysville Road 0.3 mi south of Alesi

Leeland Road Crossing, southeast of Leeland

Between Settling Basins

Between Settling Basins

60 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude 

764418

Station name

Next to gate at the entrance to'; Tth^ewag 

First tributary south of Rti 9 i c

01668000

01673000

01674500

01677000

02012500

Small footeridge^near ^ !: 1 '' \ \ 1 I.

500 ft above rnopth : .' M \ M ; : j i i i \ ; ; :: ' " " i ; ;; :

Bridge on Ashland Avenue

Bridge on Western Run USGS-01 583500

At bridge on Md. Rt. 7 USGS-01 585 100

Gaging station downstream from Confluew/Brad

US Rt. 7 Bridge

Whitehaven at; the ;Fer

'At Upper Ferry ! Crossing : bn/. :

At bridge on : M<i. ;Rt. ; 349 'in y

Johnson Pond Md, Rt, 349 above i)arn

Clar;ks.:Lane:and^ Cross Country llvdU: i; i: ;..; ; ; ^!s Mj : :i ; , i

Water Street Crossing in Upper Marlboro

Abram Creek at Oakmont, W. Va.

Patterson Creek near Headsville, W. Va.

South Branch Potomac River near Peterson, W. Va.

; Va.

W* Va,

South Fork Branch Potomae at 

SouthFork Branch Potomac near Moorefield, 

Fort Run' near : Mo6rfield, W. Va. i \ \ \ \ \ \ i [ { \ ! \ 

South Branch Potomac River near ^ritigfield 

Little Cacapon River near Levels, W. Va. 

Lost River at Mccauley near Baker, W. Va. 

Cacapon River near Great Cacapon, W. Va. 

Opequon Creek near Martinsburg, W. Va. 

Tuscarora Creek above Martinsburg, W. Va. 

Potomac River at Shepherdstown, Wv 

 .Shenandoah: River at^ Millville, W, Va, : s ' ,, ] :, ':, 1 1

South Fork Shenandoah River "at: ' N F'Shenandoah River 'near^

Stave Run near Reston, 'Va.; ! ' ! :;;' N. M ; M 1 \ Vl: V\"[ \ H 1 1 s ^ : : ::; ;'

Smilax Branch at Reston, Va.

Cedar Run near Aden, Va.

Bull Run near Catharpin, Va.

Quantico Creek near Dumfries, Va.

South Fork Quantico Creek at Camp 5 near Joplin, Va.

South Fork QuaptScd Creek below 1?rib 1 near I<>plin, Va>

South Fork QuaMicO Creek at I*ark R-Qad near Ifrjlin, Va.

South Fork Quantieo Creek Trib ?lp $ near titijrnfiieSs Va.

South Fork Quantico Creek near Oiinifiiesi WRappahannock River at Remingtoiii ^a>

Rappahannock River near Fredericksburg, Va.

Pamunkey River near Hanover, Va.

Mattaponi River near Beulahville, Va.

Ware Creek near Toano, Va.

Jackson River at Falling Spring, Va.

APPENDIX 1 ~ 61
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station

02019500

02035000

02037700

02041650

02042287

02042426

02042440

02042500

02042720

02042726

02042736

: 02042742

02042754

1AABR000.76

1AABR000.78

1AABR002.73

1AABR005.80

1AABR007.14

1AACC006.13

1AACO009.08

1AACO014.57

1AAUAO 10.26

JAAUAO 14.51

1ABAR032.10 

1ABAR041.86

1ABEC004.76

1ABIR000.76

1ABRB002.15

1ABRU006.65

1ABRU020.12

1ABULO 10.28

1ABUL011.03

1ABUL025.94

IACAMOOO.95

1ACAX000.19

1ACAX004.57

1ACER000.20

1ACER016.46

1ACER032.15

1ACHO003.65

1ACLB000.26

1ACUB003.74

1ADIF000.86

1ADIF004.02

1ADUT000.62

1AFLB000.64

1AFLB001.40

1AFOU001.92

1AFOU004.22

Latitude

373150

374015

373155

372455 

371330

373830

373647

373307

372630

372431

372852

372858

372730

372048

391045

391045

391047

390952

390955

382303

384543

384840

382827

382927

392123 

391709

390214

385011

390248

384334

384650

384811

384750

385322

384823

391635

391518

384112

383812

384427

383112

391431

384959

^OCO'}-J

JOJOJJ

385840

391824

384721

384655

385037

385123

Longitude

794045

780510

772605

772832

772519

772528

771617

770255

765618

765821

765423

765157

764856

780508

780510

780659

780938

781054

772303

771226

771350

772342

772604

781115 

781551

774322

772700

772558

773254

774023

772659

772729

773414

770635

773315

773436

772722

773734

774718

772142

780522

772749

771446 / / 1 *Ti+U

771730

773905

772841

772915

770439

770638

Station name

James River at Buchanan, Va.

James River at Cartersville, Va.

James River at Richmond, Va.

Holiday Creek near Andersonville, Va. 

Appomattox River at Matoaca> 'Va. i : ; , : !| : ' x M J ; { ( \ 1 * i j ] N f'f j | U Jff: | 

Chickahominy River near Atlee, Va.

Upham Brook near Richmond, Va.

Chickahominy River at Rt 156 near Seven Pines, Va.

Chickahominy River near Providence Forge, Va.

Chickahominy River Walkers Dam at Walkers, Va.

Diascund Creek at Rt 628 near New Rent, Va,

Beaverdam Creek at Rt 632 near Barhamsville, Va.

Wahrani Swamp at Rt 632 near Barhamsvilley Vau

Yarmouth Creek below Cranstons Pond near T^anpl V^-

R t 7 "R T"1<1 Of* ^X/tTl/^Mi-^tf*!" ' ' : : a :' . : : i :' 1 : : : :: '; a ja ja J8 y i ! v: .. ' 8 a: :a :8 a a :: \::'

JVl. / DIMJgC, TT lUVjlGOlel i ; ::.:::':;.:: ': : i .':[ f ti :> :' i J ; .: j a - :'. f ! . f '; >

Approx 0.2 mi above Rt. 7 Bridge

Rt. 656/659 Bridge

Rt. 17-50-522 Bridge, Winchester

Rt. 1 1 Bridge, Winchester

Rt. 608 Bridge

Rt. 636 Bridge ' ; | P '; El i'HOTJlf

Rt. 620 Bridge ; ' ' ' { '':!)! iW jj;

Rt. 1 Bridge : " : : : : ,' < ;: i ( \ ( !\ \ 3 \ B ft f\ f fff'i

Rt. 641 Bridge ; : .. . : ... M 11 'ff^^BW^MIH^fnl

Rt. 740 Bridge near Dehaven, near W, Va. state line 

Rt. 522 Bridge above Gore

Rt. 734

Rt. 29/211 Bridge

Rt. 7 Bridge

At southern RR bridge off Rt. 28

Rt. 29/2 1 1 above Lake

Rt. 28 Prince William/Fairfax County

Gaging station on Old Centerville Road

Rt. 705 " : H : ^ jjn Jini?:-1^ : i17:W/Si-yUi.

Gaging station behind Cameron Station j j

Rt. 672 bridge across river from Point of Rocks, Md.

Rt. 663

Rt. 619 Bridge below Brentsville

Rt. 806 Bridge

Rt. 672 Bridge

Rt. 1 Bridge (Prince William-Stafford Co. Line)

Rt. 749 Bridge below Clearbrook Woolens j ) j j

Rt. 29/211 Bridge ' : -M'Hff:' '-^!ii5!lN:/fii!l

"R t 10^ RflHo** ' . . .'.'... . !.. : , ,'..a..-. a. a : ; .. ..:..::..::'::.:',:.,:..:.:. a.:; :::,;a|:

JVl. 1 "3 £>ilVlgC . : : .. .. : : ! . . .: : a a .:' / a'. a a : .a a a. : ..: .: :.' .a" .i.aiiaai

JVl. 

Rt 7 

/ 

"Bridge 

OJ JUgC . 

' ' '~ ?< 

: ' : : : ; ;; 

: : 

 

 

;. 

 " 

 .: .. 

:^ ;i 

, 

';r ^ 

j; 

^ 

, 

g 

a 

r 

8 

*" 

8 

^ 

8 

f 

a 

f^ 

5'5 £ 

l

: a + <> 

^ 

8 

* 

a ^8 8

Rt. 674 Bridge near mouth of creek

Rt. 1501 Bridge (Prince Wm. Co-Manassas Town)

Rt. 1530 Bridge (Prince Wm. Co-Manassas Town)

E. Glebe Road, 120 Bridge

Rt. 244 Bridge

62 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station

iA<30Q002.38

'ii4;G:CibO:liL23 i

;; S:lAb6o022.44 ;

1 jiA^O;03Q..75 : ^

jilJ^e^bQ44.36 : :!: "

1AHOC003.67

1AHOC006.23

1AHOC007.96

1AHPR003.87

1ALII003.97

M;4Alj|MOO.:ia6 ; y

!jt^I^yJ05;76;;! 

;!JJ<^iS6(i^iik i - ; ' ii^lfcicdoo^': : ' . HllM]||bC004.38 1 1; :

1ANOF002.14

1ANOG005.69

1AOCC006.71

1AOCC024.74

1AOPE023.56

[ilAj^P|p(||||OJ!M'

1AQP EOB2.52 MI

1AWE040.86

HtAiQPE047.44 : : :

1APIM000.15

1APIN000.57

1APOH004.79

1APOH005.36

1APOH007.65

1APOH015.09

;:lA|»b!WW.?2 i

1APOT170.40

lAPbW003.il

1AQUA004.46

1ARED00046

1ARED001.24

1ARED001.61

1ARED004.45

1ASCA001.39

1ASCO000.76

Uij4S0C 00 1.66-1 ! : :

M: lASbC01;1.82""'

JASOCOI2.38

1ASOQ006.73

1ASOT001.44

1ASUG004.42

1ATUS000.37

1ATUS003.19

1AUMC009.61

1BBLK000.57

Latitude

390508

390106

390048

385911

-,M 385451 ;,

391604

391425

391329

385740

384936

391004

385836

383842

391218

391131

384734

390438

384110

384219

391552

391443

391041

390550

390631

385610

381537

384154

384204

384312

384733

:;:382O4!

391924

I 383544;:

:::; :: : 383356 :

391113

391123

391133

391243

380523

385702

391127

390831

390831

383514

384518

390047

390503

390615

381928

382242

Longitude

773041

773436

774201

774742

775519

781427

781541

781646

772552

773419

773213

773905

"772035

773728

774032

773731

774152

771547

772650

780159

780227

780423

780631

781218

770710

770240

771207

771236

771244

771625

: 772345 ;

774231 '

; ; 771757

771945

780505

780558

780620

780851

764724

771221

773657

774252

774323

772544

774027

772209

773101

773112

770540

785534

Station name

Rt. Bridge

Rt 621 Bridge

Rt. 734 Bridge

Rt, 611 Bridge near Loudoun, Fauquier Cty

Rt 17 Bridge

Rt. 522 Bridge

Rt 679 Bridge northeast of Hayfield

Rt. 50 Bridge northwest of Winchester

Dulles Airport Access Road, Loudoun Co.

Rt. 705 Bridge

Rt. 15 Bridge

Rt. 632

Rt 640 Bridge

Rt. 681 Bridge

Rt. 287 Bridge

Rt. 29/211 Bridge

Rt. 722 Bridge

Rt. 123 Bridge

Rt. 234 Bridge

Rt. 667 Bridge, Va.-W. Va. state line

Rt. 672 Bridge

Rt. 7 Bridge at gaging station

Line

Rt. 50 and 17 Bridge southeast of Winchester

Rt. 1 1 Bridge south of Winchester

Rt. 120 Bridge (under Chain Bridge), Glebe

Rt. 205 Bridge

Rt. 611 Bridge

Rt. 1 Bridge above Stp

Rt. 641 Bridge

Rt. 645 Bridge

Rt. 608 Bridge

Rt 340 Bridge, Va.- Md. Line

Rt. 1 Bridge

Rt. 1 (Business) Bridge

Rt. 659 Bridge

Private Bdg. Upstream Rt. 660

Rt. 656 Bridge

Rt. 11 Bridge

Off Rt. 3 below Arrowhead Mfg. Co.

Rt. 193 Bridge

Road

Rt. 698 Bridge near Waterford, Loudoun Co.

Rt 611 Bridge below J.I. Cornell Discharge

Rt 690 Bridge above J.I. Corn well Discharge

Rt 619 Bridge

Rt 215 Bridge

Rt. 7 Bridge

Rt. 653 Bridge

Rt. 643 Bridge

Rt. 301 Bridge

Rt. 794 Bridge

APPENDIX 7-63
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station

1BBLR002.10

1BBLK003.86

1BBLK006.04

1BCDRG02.84

1BCDRO 13.29

1BCKS001.03

1BCKS003.10

1BCKS005.10

1BCKS007.12

1BCRO000.43

.i;tittS»6M3 h' M

(jlfi^ltW^^^!^1

(fttW^toi^ 1 !^ 1 ^

li%^Qii$5^. :' l i

1 IjiC^O' 17jio' ; : : : : ;l I ,

1BDGR000.23

1BDGR004.02

1BHKS000.96

1BHKS006.04

1BHKS006.23

l|lB|fI^000Jj^;.|.j; 

hi:BMitroo:2,6o: P' H

^ItijiftWo^MiirU;

];i:aiitiWooiii'T;: N:

Iji^ie^flcil^o,]^ 15'' 1BLEW005.68

1BLEW006.93

1BLEW007.08

1BLNV000.21

1BMDD001.65

1MWI3L001L83

1BW£>LQ2109

1BMI>L029.46

1BMDL034,28

^^B;Ml5ftp6M::-: :': :

1BNFS000.57

1BNFS010.34

1BNFS012.98

1BNFS037.89

1BNFS043.06

|;: : l liiNft!S054,75 :: '... :::

J:i'|^M$059:!s-r <

lBNfS062.18

1BNES076.64

H ;:lMMFS07d.i67 j ; 

1BNFS072.78

1BNFS081.42

1BNFS087.02

1BNFS088.00

1BNFS088.38

Latitude

-'382322;,

382407

382519

390022

390440

382115

382223

382324

382447

385717

380801

380936

0^380743:

Hi 380743

380534

390618

390814

384230

384014

384005

; ' f ! i 38S634 

H: 385439 ; : P | !i 381058 !

380958

380923

380917

380904

380900

383705

382649

; 381543

381234

381228

381408

U 381437:

385658

385836

385904

385411

385239

385045

384923

38483 1

384446

384444 

384350

383907

383814

383808

383756

Longitude

785451

785417

785314

781909

781934

785621

785606

785651

785610

781126

:785756

t ' I :-7&$?& f ' 

785941

785941

790153

775523

775735

782721

782727

782732

781114 

781106

785831

790014

790221

790226

790333

790337

784755

785902

785144

785844

790009

790058

790208

781154

782013

782203

782853

782803

783149

:: ; 783257

783358

783820

TBlfiTI /QJoZl

783842

784152

784625

784717

784714

Station name

Rt, 988 Bridge : : : . " ! '" In : '. : : : : HyThT;

Rt. 679 Bridge

Rt. 726 Bridge south of Harrisonburg

Rt. 11 Bridge

Rt. 628 Bridge

Rt. 867 Bridge at Mt. Crawford

Rt. 11 Bridge

Rt. 704 Bridge

Rt. 701 Bridge at Dayton

Riverton Corp. Bridge

Rt. 254 Bridge . : , : : - : <<u; nyiM^^H^ii.a^imu

.. Rt. 254' Bridge (Augusta County) , ' ; . . . . : : : : . . l ; ; ? ,? ;: ; : : ; : [ 1 M:'^ ||. |}| [

Rt. 794 Bridge (Augusta County) 1 1 1

Rt. 794 Bridge

Rt. 635 south of Staunton (Augusta County)

Rt. 621 Bridge, near Berry ville

Upstream of Town of Berryville Stp

Rt. 648 Bridge below Luray

Immediately below Town of Luray Stp

Rt. 675 Bridge in Luray

At Riverton Junction : . ; M u ;,!;;; ill ij.^iy

Rt ^5S Tirif'tw' af Fmnt RAVS! iVL. ^/^/ JJL Ivl*^* <*v -i IWlll- iX-V/yt** : : :

Rt. 612 Bridge Between Veraona & Laurel Hill

Approx. 0.3"mi below Rt. 275' Bridge ' : . : : : ; ; i- 1 1 ^ \ 1 1 '^ ^1! 1 S : ii

Below Sewage Disposal Discharge ; . > { ;: \ M ^ H. ; U ! 1 ^ ill ^ i : i ; : p Pfl ! :^lf ill-! P

Above Sewage Disposal Discharge

Below State School For Deaf & Blind, Staunton

Above State School for Deaf & Blind, Staunton

Downstream of Rt. 257 Bridge

Rt. 734 Bridge 1.5 mi below Va. Valley Processors

Rt. 769 Bridge

Rt. 780 Bridge east of Verona

Rt. 1 1 Bridge NE of Staunton

Rt. 626 Bridge over Middle River

T> f 742 Bridse : : . ; ii s : . . : : .* I. ! a !.! . ! !-!i i'i '< i ;.: ;: ; 1 a 1 1 1 1 ( i 1 i ; 

Approx. 0.1 mi below Rt. 340/522 Bridge

Rt. 55 Bridge Warren/Shenandoah County

Rt. 648 Bridge at Strasburg

Rt. 663 Bridge

Rt. 758 Bridge near Woodstock

DGIF Boat Launch

Rt. 675 Bridge east of Edinburg

Rt. 698 Bridge, south of Edinburg

Rt. 698 at New Bridge (gaging station)

Rt. 698 Bridge ' :- : i" ..: . ;rn!!ifLf:H;I 

Rt. 11 Bridge

Rt. 617/953 Bridge, West of New Market

Rt. 42 Bridge at Timberville

Upstream from Shen-valley Meat Packers Effluent

Upstream of Rockingham Poultry Discharge

64 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

1BNTH021.00

1BPSG001.36

1BSHN022.63

1BSHN038.27

1BSHN048.00

1BSSF003.56 

1BSSF046.67 

1BSSF054.20 

1BSSF060.57 

1BSSF078.20

1BSTH000.19 

1BSTH007.80 

1BSTH014.49 

1BSTH019.26 

1BSTH024.70

1BSTY006.81

2-ACU001.77

2-ALM000.42

2-APP012.79

2-APP016.38

2-APP029.23 

2-APP029.99 

2-APPQ50.23 

2-APP068.93 

2-APP110.93

385449

384204

383845

383520

382857

784836

785015

785137

785146

785307

^vMm

River Mile at Wildwood Park Dam in Bridgewater 

Rt. 55 Bridge

Rt. 7 Bridge, Castlemans Ferry Bridge 

Rt. 50 Bridge 

Rt. 624 Bridge 

!|p|f^j^^

Wti

Rt. 619 Bridge at gaging station

Rt. 675 Bridge, West of Luray

Rt. 211 Bridge, east of New Market

Rt. 340 Bridge

Ri. mi near Dam on South Fork Shen. near Shenandoah

Rt. 629 Bridge at Port Republic

Rt. 778 at Harrisonburg

Rt. 612 Bridge at Crimora

Rt. 611 Bridge, near Dooms, Augusta County

Rt. 250 Bypass in Waynesboro, Augusta County

Rt. 675 Bridge

Rt. 600 Bridge near Ferndale Park (Upper Canal)

Rt. 5 Bridge

Rt. 36 Bridge

Rt. 600 Bridge (Chesterfield County)

Lake Chesdin, above entrance of Namazine Creek 

Lake Chesdin, in stump area above Namozine Creek 

Rt. 360 Goodes Bridge

Rt. 609 Giles Bridge (Amelia/Powhatan Co. Line) 

Rt. 45 Bridge at Farmville (Co. of Prince Edward)

APPENDIX 1-65
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station

2-APP1 18.04

2- APP 127.08

2-ASH001.26

£* ? A<5Wffi09 T\ /Atjjm/u^. / 3

2-ASH003.50

2-BCC004.71

2-BCC005.58

2-BEN006.27

2-BKW005.57

2-BKW007.19

2-BLP000.79

2-BLYQ05.73

2-BRC001.80

t-BRC002.30

I^iRTooo.oi

2-BUF002.10

2-BUF013.53

2-BUF023.21

2-CAT000.34

2-CAT023.83

;;2-CCC001:J5 : : :

;l2-CFiP004.67 M . l^CJtilCOS^r,.' 1 . 1:2^1^42.22;:^

} : l2CTi:o49,59 : ..::.:..

2-CHK055.04

2-CHK062.57

2-CHK064.64

2-CHK074.79

2-CHK076.59

lftCRE002:.37 i

1l-CR(jOOO,:23: ; I ; . :^c: s;coolltM :M:

||Hfe¥P002;58;M;';:: ;.:

IliM^mMnlti

2-DPC026.04

2-EBE004.98

2-FAC000.85

2-FAC003.67

2-FAC005.78

^i^ACQiMe . :

li-GIL000.42'

I2^GRKOOQ,57

!|k|R'fcQOU73'

i|rH^007J6-:;;

2-HOL000.99

2-HOL001.15

2-HOL001.24

2-HOL003.15

2-HRD011.57

Latitude

372004

372130

371900

3/loJj 771 2^7

371918

380410

380448

364925

372457

372406

381143

; ;;!::;! -3? 1458

M i: "373143

H-N; 3731 .17 

375809

373635

373619

373916

373607

372800

371709

375914

-: 372544

372811

373053

373307

373543

373641

374138

374202

375805

: 373854

i;;i;i 375842

: ;.i 374731

M.:> 374742:

371221

365226

372623

372739

372730

372656

373120

372640

; ; 372738

372906

372328

372321

372342

372458

384845

Longitude

782803

783317

772223

772344 f I A**/"T"t

772421

795350

795350

762953

791109

791104

793414

771900

781622

781500 

793016

785521

790134

790612

794712

800020

773711

792940

770220

770816

771219

771617

772257

772218

772927

773049

795510

794904

795433

794534

795949

780714

761238

772620

772758

772909

773352

772441

772613

772640

790957

783809

783824

783810

783810

782718

Station name

Rt. 1 5 Bridge West of Farmville (Prince Edward Go.) ; |

Rt. 609 near Farmville (County of Prince Edward)

Rt. 746 Bridge, Conf. with Appomattox River

Rt. 620 Bridge near Walthall

AtRt. 1/301 Bridge : : : . \ : J: : -; ^jjHJHl

Rt. 39 at gaging station

Rt. 39 Bridge gaging station

Rt. 337 Bridge

Alt. Rt. 501 Bridge

Rt. 221 Bridge

Rt. 614 Bridge : ' ';: M ' ""M: ' ' : : :' ' ';: ; ; 1 : \ II 1 1 11| ( |i||

Rt. 630 Bridge below Fort: Lee ! ' : < M;' , : '.: N N i> * t 1 i: >> 1 ^fftW

Bear Creeklake State Park (Recreation Area)

Bear Creek Lake State Park at Headwaters 

Rsta.3-Burke-Parsons-Bowlby-Outfall 003, Rt. 39

Rt. 657 at gaging station

Rt. 29 Bridge

Rt. 778 Bridge, NW of Amherst

Bridge near Salisbury Furnace-Botetourt County

Gage near Catawba, Rt. 779 Bridge

Rt. 657 Bridge : ' ^l; : ;j i h j 1 i|;;;iH)fl: ;

Downstream of Rt. 42 Bridge M : ; i^'P- H : II

Rt.' 155 Bridge . '. : . . ; Jl"; M-^iiSRUDJ

Rt. 609 Bridge ' ' |: : i' i'ii' iiSSJl}|

Rt. 60 Bridge ' . ; . .; :Mf JiyiHHiiHSI

Rt. 156 Bridge

Rt. 360 Bridge

Rt. 627 Bridge

Rt. 626 Bridge

Rt. 625 Bridge

Rt. 605 Bridge ; . : .. |i U ; , i :; ^ HS i: ! ! 1 11^1

Rt. 61 5 Bridge West of Eagle Rock ' : ' . : ; \ \ j ;; i i ;; 1 1 ;: :; ( | ;: | If;; 'ft :; H i j' ; m

Rt. 687 Bridge !i ! M ' ^ '- jli =/^i W/^IWWf!P

Rt. 633 Bridge, east of Iron 'Gate : ; ; : : : : ; ; : '; . ; : i 1 i ! 1 :: !l| 1 J j.J |J |J J Jiff;:

Rt. 60 Bridge . . ; . ; i :: p ; L : : : ' ^ 'f ^^W^W^IiViMi

Northeast of Crewe Stp at Rt. 619

Rt. 13 Bridge, City of Norfolk

Rt. 1 Bridge

Hopkins Road Bridge

Rt. 10 Bridge

Rt. 360 Bridge' '. . "-M i M ;f tiMfJH

Government Road Bridge ' . ; ' . : j H H ' 0 j 1 1 \ \ Illli

Falling Creek Exit off 1-95 .. ' ! :: . : .. : , ih ;j ]', 3 j j j j

Walmsley Blvd. ' ' Mj: : ! : : : : ' :J j : ' j . :j 'i : Ni : f.|l:

Rt. 130 Bridge above Madison Heights Water T P

Appomattox-Buckingham State Forest (Holiday Lake)

4-H Camp, recreational area

Appomattox-buckingham State Forest (Holiday Lake)

Rt. 614 Bridge

Rt. 637 Bridge

66 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

2-JKS018.68 

2-JKS023.61 

2-JKS036.il 

2-JKS058.60 

2-JMS110.30

2-JMS 189.31 

2-JMS229.14

2-JMS258.54 

2-JMS275.75 

2-JMS277.30

2-JMS345.73 

2-JOB000.39 

2-JOD001.96 

2-LAFOOO.OO 

2-LKN001.67

2-MRY014.78 

2-MRYO 16.01 

2-MRY038.10 

2-MSCOOO.ll 

2-NMZOOO.ll

2-PCT002.46 

2-PCT004.92 

2-PNY003.06 

2-PNY008.15 

2-POT000.12

374523

374719

375235

380233

373149

374751

373211

372420

373048

373142

374632

373023

371944

365342

380338

795915

800003

795839

795255

772602

782747

784939

790850

791954

792107

t 6I7 1

; : water :

Rt. 18, City of Covington 

Jackson River at Covington Gage City Park 

Jackson River at Falling Spring Gage Smtih Bridge 

Rt. 603 at gaging station, Bath County 

Rt. 360 Bridge

Wjtort6rsv: illei:.

Downstream approximately 0.2 mi below Rt. 20 Bridge 

Rt. 60 at Bent Creek 

Rt. 29

Below Big Island

Boat Dock on Property of Ownes-Illinois 

Slue:: Ridge; Pkwy; Bridgfe ab;<pe l 

j Rt. 50 1 i; Bridje, ,

^

Rt. 220, 1st Bridge below Cowpasture River 

Johns Creek at New Castle Gage Rt. 615 Bridge 

Rt. 724 Bridge

Buoy 2-between Tanner Pt & Lamberts Pt (Mouth) 

Pt. Approx. 20 ft above confluence with unnamed tributary 

kfetill^Brid^ev West ' 

Rt. 130 Bridge at;Glasgyw;;

Rtjy^45 ^ Mi iBpeoa -

Rt. 60 at Ben Salem Wayside

Off Rt. 703 upstream from gaging station

Downstream of Rt. 39 Bridge N. of Rockbridge Baths

At Confluence with Rivanna River

Entrance to Alien's Marina

Rt} 8 (Hickory 'Roadl

Rt. 1 Bridge

Centralia Road Bridge below Stp

Rt. 674 Bridge at Roses Mill

Rt. 778 Bridge

Rt. 18 Bridge

APPENDIX 1 ~ 67
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

2-RKF000.19 

2-RRN002.19 

2-RRS003.12 

2-RRS009.06 

2-RTD003.68

2-SFT004.92 

2-SFT019.15 

2-SFT021.25 

2-SFT023.36 

2-SFT025.32

2-TNB001.73 

2-TYE000.30 

2-TYE013.75 

2-UPM003.53 

2-WLN007.35

2-WPK003.23 

2-WSR001.59 

2-WSR003.84 

2-XAL000.02 

2-XAL000.65

3-CON002.26 

3-DPR001.70 

3-GRT001.70 

3-HAL000.57 

3-HAZ009.58

381957

382549

383834

381731

383535

Rt. 683 ridge;,: Forest Hili Road 

Rt 686 Bridge, Jahake Road; ': ' i' : : ' ; j 

;Itt. 678 jSrid^, iijfo^ Road 1 .h ; I 

' F'drest Ilffll Avenue Bridge i ; :: L: : :3;t^|: : 

Rt. 626 Bridge 

Rt. 649 Bridge 

Upstream of Rt. 29 Bridge 

Rt. 660 Bridge, N. of Charlottesville 

Below Amherst Stp

781105

781601

12357

772443

773104

773229

773430

773549

795250

784844

785737

772626

794811

774338

794945

794750

784020

784047

782353

773747

775135

112121

775757

^^ 

Approximately 0.2 mi do^nstreitiri to. !?

Princ6 Edward State

Rt. 1 Bridge

Rt. 655 Bridge

Pocahontas State Park, Dam

Pocahontas State Park, Recreation Area

Rt. 653 Bridge

Rt. 360 Bridge ;,;. : ':,/;: . M '.= : ': ! i'

Rt. 606 Fincastle

Rt. 626 Bridge, above Confl. with James River

Rt. 29 Bridge

Rt. 1 Bridge (Brook Road)

Douthat State Park Lake at Dam

Douthat State Park Lake, R^reatioti Area 

; Douthat State Park Lake

:;I>outhat State:"

Below .the 

I Rt; 708 Bridge, Lalce Chesd r, \i;i f S F; j^W^j j^:

Rt. 602 Bridge, Lake Chesdin

Rt. 687 Bridge below Stp

Rt. 39 Bridge above Stp

Approx.100 ft above Confl W/Lickinghole Creek

Approx 10 ft above Morion's Frozen Foods Plant 

taAe^ Park, Recreation Area

i'3 ; Brid|e:;

' R : : : 1 : 

Rt. 230 

Rt. 17 Bridge 

Rt. 687 Bridge 

Rt. 17/2 Bridge 

Rt. 229 Bridge

68 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

3-LDR000.70

3-LIK001.96

3-MAH000.19

3-MAP007.97

3-MIR004.05

I

3-RAP030.21 

3-RAP043.70 

3-RAP045.08 

3-RAP066.54 

3-ROB001.90

3-RPP175.51

3-RUS005.24

3-TH0006.50

3-THO02U9

3-THR000.50

7-BHB001.19 

7-CRD001.31 

7-HAB000.14 

7-LMB000.57 

7-LNC000.68

7-XAZ000.30 

7-XBB000.58 

7-XBG000.24

7-XBQ000.64

8-CON000.23

Rt. 680 (Ford) Ne of Madison, below Mad. Stp 

Rt. 360 Bridge below Stp For Warsay, Richmond Co 

Rt. 651 Bridge near Confluence with Rappahannock 

Rt. 1 Bridge 

Rt. 611 Bridge

Rt. 522 Bridge

Rt. 634 Bridge below Madison Mills

Rt. 15 Bridge

Rt. 29 Bridge at gaging station (Greene/Madison Co)

Rt. 614 Bridge

Rt. 647 Bridge 

Rt. 626 Bridge 

Rt. 729 Bridge 

Rt. 620 Bridge 

Rt. 522 Bridge

1 Rt; 21 1 ;

I.RI.1 .718

Rti 680;

Rt. 600 Bridge

Rt. 793 Bridge

East Side of Rt. 13, Northampton County

Rt. 658 Bridge

Little Neck Creek

: S]i|

Rt. 693 Bridge (Sandy Bottom Branch)

Rt. 693 Bridge at J.M. Taylor Packing Co. effluent

Rt. 763 Bridge

Adjacent to Railroad Tracks, Northampton County

Contrary Creek Arm of Lake

APPENDIX 1 ~ 69
SYNTHESIS OF NUTRIENT AND

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued

Station Latitude Longitude Station name

8-CON006.92 

8-CON007.69 

8-CON007.88 

8-FLG000.76 

8-FRS004.65

-MPN083.62

-MPN094.79

-MT AGO 1.69

-MTN000.96

-NAR005.42

-NAR033.92

-NAR047.57

-NIR003.96

-NIR009.61

-NST003.46

8-PMK088.il 

8-PNI002.43 

8-POR004.13 

8-POR008.97 

8-PORO 16.04

8-TRY004.98 

8-XAF000.15 

8-YRK011.14 

8-YRK028.10 

ST01

380248

380217

380207

374800

372254

374719

380816

380859

381016

381217

381113

380731

371730

372800

384139

772035 

772305 

772853 

780606 

772541 

772801 

772758

1 773344 

773758 

774129 

774204 

774850 

773109 

773412 

774136 

772205 

772545 

775703 

775905 

771956 

772214 

772646 

773128 

773545 

773802

( 772528

775539

781205

763413

764555

771706

Rt. 6521 Bridge o^er LakeAnjia

Contrary Creek Arm of Lake

Contrary Creek Ms-5 near Lake

Below Sulphur Mine Rt. 522 Bridge

Rt. 522 Bridge (Louisa County)

Below Boyd Smith Mine

Below Arminius Mine

Above all mines

Rt. 1 Bridge

50 yards Downstream Toano Stp

Rt. 613 Bridge (Louisa County)

Colonial Parkway at Conf. with Whitman Swamp

Rt. 627 ' ::/ "' ; .; ';- : ; "Ny'i j P;; [

Rt. 628'Bridge : V'.'ij P/.: ;; P : . p !MP.; ;

Rt. 647 Bridge . ; ;... ; '. ! P j ; : PP^M : 'y:;l1

Rt. 2/301 Bridge

Rt. 605 Bridge

Rt. 632 Bridge

Rt. 643 Bridge

Sta.l, Rt. 30 Br (Morris Bridge)

Just below Evans Products Co. Effluent

Rt. 1 Bridge (Fox Bridge)

Rt.601 Bridge

Rt. 738 Bridge

Rt 658 Bridge (Davenport Bridge)

Rt. 601 Bridge (Smiths Mill Bridge)

Rt. 208 Bridge (New)

Rt. 1 Bridge

Rt. 208 Bridge NE of Spotsylvania

Rt. 622 Bridge

Rt.601 Bridge

Rt 207 Bridge

Rt 651, Orange County

Rt 630

Rt 614 Bridge

Rt. 2/301,N of Hanover

Rt. 606 Bridge

Rt 1 Bridge

Rt 208 Bridge

Rt. 608 Bridge

Rt 738 Bridge

Rt 610 Bridge, West of Inez-Louisa Co. Line

Rt 15 Bridge V"P ' : : ' ' : . P ; ' : . -y ' 

Rti 660 Bridge

Rt. 629, Orange County

Just below Gordonsville Stp Effluent

Buoy 34

Bells Rock Light

Occoquan Dam

70 ~ APPENDIX 1
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 1. List of water-quality station numbers, latitude and longitude, and station names Continued 

Station Latitude Longitude Station name

i Riiii

 i Lake: Ja^ksbi^CJcc^qiipp' River 

;?Cedar:: Rttn : ,seaf

-Broadf iRlinl 1 near

Yates Fbrd ;B^;i

Yorkshire Southwest Fairfax County

Cub Run near Bull Run

Bull Run near Catharpin

Broad Run at Buckland

APPENDIX 7-71
SYNTHESIS OF NUTRIENT AND

72
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 2. SAMPLE SUPPLEMENTAL INFORMATION DATA SHEET

APPENDIX 2-73
SYNTHESIS OF NUTRIENT AND

PROGRAM/PROJECT DATA QUESTIONS 1-12

1. Program or project name _______________________________

2. Basin name(s) _____________________________________

3. Agency name ___________________________________

4. Program description and objectives

5. Number of stations

6. Contact person __

7. Your name

8. Collection methods

a. Method (check all that apply)

_ Discrete automatic sampler 

_ Grab (hand) sample 

_ Composite 

_ Other

b. Samples were collected (check all that apply)

_ Single point center of stream

_ Single point anywhere in stream

_ Multiple point sampling (width integrated) How many points?

_ Multiple depth sampling (depth integrated)

9. Did your agency collect the samples? Yes No

If no, please identify the collector agency __________________

10. Did your agency analyze the samples? Yes No

If no, please identify the analyzing agency ______________________

11. Water-quality assurance (QA) information

a. Were (QA) samples sent to the analyzing agency? Yes No

b. Does your agency have (QA) procedures documented? Yes No

12. Sample collection frequency (check or answer)

a. Primary stream conditions at sample collection time

_ Base flow 

_ Storm flow 

_ Total flow

b. Frequency of sample collection

_ Monthly 

_ Bi-weekly 

_ Quarterly 

_ Other

c. Are storms sampled? Yes No

If yes, number of storms per year ___ Number of samples per storm

74 ~ APPENDIX 2
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

INDIVIDUAL STATION INFORMATION QUESTIONS 13-20

13. Station name/description__________________________________________

14. Station number _______________________________________________ 

Corresponding station #'s from other agencies______________________________

15. Latitude and longitude

16. Period of QW record (mo/yr)

Period of AD APS Q record (if available) ____ to ____ ; ____ to

17. Land use (subdivide any category if possible)

a. __% Agriculture ___________________________ 

b. % Urban

c. __% Residential 

d. % Forest

18. Watershed characteristics

a. Drainage area (square miles) 

b. Slope (range or average)

c. Physiographic province (Coastal, Piedmont, etc.) _______ 

d. Underlying lithology (sandstone, shale, etc.)__________ 

19. Objective of study (check all that apply)

_ Agricultural management (type and date of implementation)

_ Manure management

_ Crop management (row cropping, cover crops, etc.) 

_ Pesticide management 

_ Stream bank fencing 

Other

_ Contact agency for additional data

_ Long-term trend studies 

_ Water-quality network 

_ Sediment or nutrient transport 

_ Acid mine drainage 

Other

20. Questions or comments

APPENDIX 2-75
SYNTHESIS OF NUTRIENT AND

76
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 3. EXAMPLE OUTPUT FROM T-PARAMETER LOG-LINEAR REGRESSION MODEL 

USED TO ESTIMATE NUTRIENT AND SEDIMENT LOADS

APPENDIX 3-77
SYNTHESIS OF NUTRIENT AND

MODEL FOR ESTIMATING CONSTITUENT

TIM COHN VERSION 93.05

OUTPUT FILE:/hbgl/langland/ches.bay/data/model/model.out/rerun 

*APPROXIMATE VARIANCES* 

CALIBRATION FLOWS FROM DV FLOW FILE 

USER SPECIFIED PERIOD: 1985.75-1989.75 

DATE OF FIRST DBS. USED IN CALIBRATION: 10/24/1985 

DATE OF LAST DBS. USED IN CALIBRATION: 09/22/1989 

STATION NUMBER: 01575500 

REGRESSION OF P00630 

ON 7 REGRESSORS

LOADS

NUMBER NAME

1 CONSTANT

2 LOG-FLOW

3 LOG-FLOW SQUARED

4 DEC_TIME

5 DEC_TIME SQUARED

6 SIN(2*PI*T)

7 COS(2*PI*T)

CENTER

0.000

5.823

5.823

1987.855

1987.855

0.000

0.000

CONCENTRATION MODEL

COEFF.

1.

-0.

-0,

-0.

0

0.

0.

1211

0051

.0528

0449

.0351

.3120

.0551

0.

0.

0.

0.

0

0.

0.

S.D.

0317

0196

.0158

0176

.0170

.0288

.0279

35.

-0.

-3,

-2.

2

10.

1.

T

31

.26

.35

.54

.07

.82

.98

0.

0.

0,

0.

0.

0.

0.

p

000000

.789560

.000762

.010100

.036055

.000000

.044788

LOAD MODEL

COEFF.

7.

0.

-0.

-0.

0,

0.

0.

8389

9949

.0528

,0449

.0351

.3120

.0551

0.

0,

0

0.

0

0.

0.

S.D.

.0317246.

.0196

.0158

.0176

.0170

.0288

.0279

50.

-3.

-2.

2.

10.

1.

T

.90

.78

.35

.54

.07

.82

98

S

R**2 (%)

N 167

M 160

NCENS 0

SER. CORR. OF RES. 0.49801

CONSTANT LOG-FLOW LOG-FLOW

0.0000

0.0000

0.0000

LOG-FLOW 

LOG-FLOW 

DEC_TIME 

DEC_TIME 

SIN(2*PI 

COS(2*PI

DECJTIME DECJTIME SIN(2*PI'

'.0568

PLOT OF RESIDUALS AGAINST THEIR Z-SCORE

0.5

0.3

-0.1 +

-1.6 0.0 

Z-SCORES

1.6 2.4

78 ~ APPENDIX 3
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

PPCC CORRELATION 1.99101

PLOT OF RESIDUALS AGAINST PREDICTED VALUES

1.5 +

0.1

-0.1

* * * * * i

,5 +

5.2 6.0 6.8 7.6 8.4

PREDICTED VALUES

PLOT OF RESIDUALS AGAINST FLOW 

:::::::+::::::::::::::+:::*::::::::::+::::::::::::::+::::::::::::::+:::::::

::::::::+:::::::::::::::

9.2 1C

:::::::: + :::::::::::::: -f

.7 +

0.5 +

0.3

i.l

-0.1 +

* *

-0.5 +

4.0 4.: 5.6 6.4

LOG OF FLOW

APPENDIX 3-79
SYNTHESIS OF NUTRIENT AND

0.7 +

0.5 +

PLOT OF RESIDUALS AGAINST TIME

1.3

0.1

-0.1 +

* * *

r * * *

* * * *

* * * 

* * *

* * *

* *

* * *

* * *

-0.3 +

-0.5 +

1986. 1987. 1987. 1988.

TIME

1988. 1989. 1990.

YEAR MO.

COMPUTED LOADS [KG/DAY] OR [G/DAY] 

LOAD:POO 630 S.E. S.E. PRED.

1985 CALENDAR YEAR

1

2

3

4

5

6

7

10

11

12

CY 

WY

1985

1985

1893.8955

5670.1230

2469.9547

1991.4629

2759.4766

1151.7763

1197.4386

680.9838

603.8636

628.4970

1764.5794

2201.5500

1892.8756

1965.6582

235.2045

686.1372

271.1824

209.0784

269.9209

107.9963

102.4507

54.9347

44.7089

43.7144

112.8979

129.6659

175.9880

216.3693

248.0641

808.0714

290.0292

230.5401

304.9097

118.8306

138.2845

62.2470

64.5313

51.0526

149.3977

165.5437

180.6091

220.3421

1986 CALENDAR YEAR

1

2

3

4

5

6

7

10

11

12

CY 1986

1470.2527

4856.8862

4105.6503

3771.8346

1648.9157

826.7393

531.7982

451.6450

272.3994

305.0298

887.8485

1972.5853

1736.4922

78.0603

228.5473

184.0469

167.1700

80.0868

41.2721

25.4527

19.5965

14.6486

15.3663

29.6464

64.3226

62.6355

106.5123

332.7634

268.4612

254.3408

105.5096

56.1586

35.9870

28.3976

18.5981

20.1976

56.9267

133.2529

70.6892

80 ~ APPENDIX 3
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

WY

1987

CY

WY

1988

CY

WY

1989

CY

WY

1986

CALENDAR YEAR

1

2

3

4

5

6

7

8

9

10

11

12

1987

1987

CALENDAR YEAR

1

2

3

4

5

6

7

8

9

10

11

12

1988

1988

CALENDAR YEAR

1

2

3

4

5

6

7

8

9

10

11

12

1989

1989

1855,

2516.

2096

3089

2727

1671

807

580

286

728

481,

1105,

1184

1435,

1469,

1681

3394

2118

1560

3998

1067,

604,

397

358,

355

644

552,

1388

1490

1047

1226,

2459,

1794

5631,

1620,

1110

658,

478

1032

1145,

870

1596

1470,

.4712

.6968

.8047

.3880

.5553

.9093

.1973

.9247

.1468

.3548

.8863

.7289

.1011

.3925

.4310

.1461

.4692

.9747

.7819

.5604

.0053

.5615

.6803

.0504

.6673

.0938

.7678

.8733

.8766

.7935

.6818

.2804

.6096

.0881

.6994

.9359

.7571

.9419

.7842

.0560

.8593

.3911

.6916

78,

74,

65,

92

99,

68

35

24,

14

27

18,

43

44

35,

35,

58

112

75,

61

136

42,

23

16

14,

16

28

27

35

38

45

52,

96

76

232,

80

59

38,

31

77

90

71

65

52,

.7501

.1571

.8623

.5220

.4189

.8267

.9963

.4726

.9179

.9038

.8393

.6875

.2456

.2500

.1152

.2788

.2161

.4546

.8023

.1870

.8146

.4477

.1202

.9904

.1363

.2477

.3652

.9807

.3850

.8805

.7079

.8173

.3023

.9202

.8806

.9807

.1895

.0720

.5098

.9638

.6682

.6773

.7633

85,

137,

113

184

155

100

50

38

18

53

31

91

67

42

42

115

187

118

90

252

62

36

23

21

24

43

36

44

46

67

80

150

109

368

106

76

47

40

101

109

80

72

60

.4751

.4233

.4753

.1371

.4620

.3250

.3865

.5301

.9303

.4186

.0254

.8428

.6669

.4770

.9285

.4421

.8205

.2140

.2596

.9906

.9816

.0153

.3031

.9751

.0661

.5762

.1390

.2719

.8202

.1891

.8141

.3199

.5358

.3232

.3212

.9918

.6396

.2125

.6626

.1949

.0451

.1220

.1728

APPENDIX 3-81
SYNTHESIS OF NUTRIENT AND

82
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 4. LIST OF SITES AND LOAD CONSTITUENTS IN THE CHESAPEAKE BAY BASIN

[All nutrients as nitrogen (N) or phosphorus (P); calculated constituent loads are represented by the shaded 

areas.]

APPENDIX 4-83
Appendix 4. List of sites and load constituents in the Chesapeake Bay Basin

Dissolved 

Kjeldahl 

nitrogen 

00623

Total 

nitrate 

plus 

nitrite 

00630

Dissolved

nitrate

plus

nitrite

00631

Total

phosphorus 

00665
Appendix 4. List of sites and load constituents in the Chesapeake Bay Basin Continued

Dissolved

nitrate

plus

nitrite

00631

Dissolved 

Kjeldahl 

nitrogen 

00623
Appendix 4. List of sites and load constituents in the Chesapeake Bay Basin Continued

Dissolved 

Kjeldahl 

nitrogen 

00623
Appendix 4. List of sites and load constituents in the Chesapeake Bay Basin Continued

Dissolved

nitrate

plus

nitrite

00631

Dissolved 

Kjeldahl 

nitrogen 

00623

m

CD

*

 u 

j

CO
Appendix 4. List of sites and load constituents in the Chesapeake Bay Basin Continued

Dissolved 

Kjeldahl 

nitrogen 

00623
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 5. EXAMPLE FORMAT OF NUTRIENT- AND SEDIMENT-LOAD DATABASE

APPENDIX 5-89
SYNTHESIS OF NUTRIENT AND

Appendix 5. Example format of nutrient- and sediment-load database

[T, total flow; F, fixed flow; H, high-flow condition; N, normal-flow condition; L, low-flow condition]

Station

Identification Agency 

number

Parameter Year

Annual 

load 

(tons)

Yield 

(pounds 

per acre)

Load 

type

Percent 

error

Hydrologic 

condition

01491000

01491000

01491000

01491000

01491000

01578310

01578310

01656960

01656960

01656960

02035000

02035000

02035000

02035000

01616000

01616000

01616000

01616000

01491000 USGS

01491000 USGS

01491000 USGS

01491000 USGS

01491000 USGS

MdMDE 

MdMDE 

OCCOQ 

OCCOQ 

OCCOQ

USGS 

USGS 

USGS 

USGS

01616000 VDEQ

00600

00600

00600

00608

00608

246

129

185

302

356

218

118

353

255

173

136

17.5

6.7

62,800

69,700

70,900

14.7

15.8

9.9

364

221

357

229

265

23,2

21.1

22.5

23.0

26.4

6.80

3.57

5.12

8.34

9.83

9.76

7.05

4.80

3.75

.49

.18

13.0

8.03

8.18

.92

.99

.62

.18 

.11 

.18 

.11 

50.1

3.99

4.27

4.36

5.00

fii

2.8

2.7

2.8 

3.3 

3.1

6.2

3.8

20.0

20.0

18.6

11.6

13.3

19.7

47.5

59.7

111 til 1

15.0

10.6

11.0

12.9

N 

H 

H 

H

90 ~ APPENDIX 5
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 6. STATISTICAL SUMMARIES OF WATER-QUALITY CONCENTRATION DATA FOR

TOTAL NITROGEN, TOTAL PHOSPHORUS, DISSOLVED NITRATE, AND SUSPENDED

SEDIMENT FOR ALL 127 LOAD SITES GROUPED BY SUBBASIN

[Concentration data in milligrams per liter; n, number of samples; Min, minimum; Max, maximum; --, no data; 

LT, contains values reported less than the detection limit]

APPENDIX 6-91
Appendix 6. Statistical summaries of water-quality concentration data for total nitrogen, total phosphorus, dissolved nitrate, and 

suspended sediment for all 127 load sites grouped by subbasin Continued

Site 

number

n Minimum 

date

Maximum 

date

Total nitrogen

n Min Median

Total phosphorus

Max n Min Median Max

Dissolved nitrate

n Min Median Max

North Branch Susquehanna

01503000

WQN0306

01509150

01520500

01531000

WQN0332

WQN0319

WQN0324

01520000

WQN0320

01531500

WQN0305

WQN0317

01536000

WQN0313

WQN0302

WQN0312

01540500

WQN0301

WQN0308

WQN0310

WQN0318

19

203

73

114

78

109

126

203

58

210

128

203

211

32

205

167

145

600

198

128

212

131

720907

720831

741216

720624

720622

760217

711116

721128

711021

720412

721018

711116

711116

711014

711117

720726

711123

711001

720301

711130

720217

711116

750515

920915

801209

920916

920917

920901

871209

920910

770916

920910

920914

920902

920915

760806

920902

920922

871207

920916

920914

920914

920910

920902

18 0.18 0.64

0

1 1.2 1.2

45 .16 .42

56 .18 .80

0

0

0

34 .17 .42

0

112 .75 1.4

0

0

0

0

0

0

408 .40 1.4

0

0

0

0

0.95 18

195

1.2 9

4.4 45

1.6 52

106

119

195

1.4 37

201

4.3 128

195

205

15

200

161

141

14 425

187

118

206

118

0.02

.02

.01

.01

.04

.04

.01

.01

.01

.01

.02

.02

LT

.04

.03

.02

.03

.01

.03

.01

.02

.01

0.03

.05

.02

.03

.10

.08

.04

.04

.04

.06

.07

.08

.04

0.11

2.6

.03

.92

.34

1.7

1.3

.91

.20

2.0

1.3

2.1

4.2

.28 28

.41

.10

.44

.08

.08

.04

.17

.03

3.4

.80

3.8

5.4

1.1

1.4

4.3

1.0

8 0.20 0.35 0.8

o

o

2 .51 .66 .8

3 1.0 1.2 1.3

o

o

o

1 .58 .58 .5

o

o

o

o

4 LT .12 1.4

o

o

o

38 .10 .78 1.3

o

o

o

o
Appendix 6. Statistical summaries of water-quality concentration data for total nitrogen, total phosphorus, dissolved nitrate, and 

suspended sediment for all 127 load sites grouped by subbasin Continued

Site 

number

n Minimum 

date

Maximum 

date

Total nitrogen

n Min Median

Total phosphorus

Max n Min Median Max

Dissolved nitrate

n Min Median Max

West Branch Susquehanna

WQN0406

WQN0405

WQN0422

WQN0420

WQN0418

WQN0419

01545600

WQN0443

WQN0412

WQN0423

01548408

WQN041 1

WQN0410

WQN0402

WQN0408

01553500

WQN0401

WQN0425

01554000

WQN0203

WQN0229

WQN0407

WQN0415

WQN0434

214

157

120

123

136

140

184

-

163

111

41

69

228

212

229

515

193

159

125

147

125

168

222

120

711213

711213

711213

711214

711214

711214

711028

--

721031

720913

771102

711206

711206

720306

711129

711021

720928

720914

720830

720302

720912

711129

720302

720913

920910

871209

920910

920902

920902

920902

920714

--

871210

920928

810318

871102

920902

920902

920901

920916

920914

880105

780920

920916

920916

871202

920914

920902

0

0

0

0

0

0

42 0.20 0.58

-

0

0

0

0

0

0

0

309 .25 1.1

0

0

107 .47 1.0

0

0

0

0

0

200

145

104

113

117

128

3.2 95

--

161

100

0

65

216

204

212

12.0 338

184

154

2.1 111

137

119

158

218

113

0.01

LT

LT

LT

LT

.01

LT

-

.02

.01

--

.01

.01

.01

.01

.01

.01

.01

.01

.02

.02

.01

.02

.01

0.04

.03

.03

.03

.02

.02

.01

--

.09

.03

-

.04

.04

.04

.03

.04

.06

.06

.05

.07

.04

.04

.17

.03

3.4

1.3

.10

.11

5.0

.46

.44

-

2.0

.59

--

2.8

.86

.46

5.6

5.4

.86

2.5

.41

.45

.35

2.5

4.4

.64

o

o

o

o

o

o

1 0.20 0.20 0.2

-

o

o

o

o

o

o

o

27 .14 .63 1.1

o

o

1 .59 .59 .5

o

o

o

o

o
Appendix 6. Statistical summaries of water-quality concentration data for total nitrogen, total phosphorus, dissolved nitrate, and 

suspended sediment for all 127 load sites grouped by subbasin Continued

Site 

number

Minimum 

date

Maximum 

date

Total nitrogen

n Min Median Max n

Total phosphorus

Min Median Max n

Dissolved nitrate

Min MedianMax 

Juniata River

WQN0217

01562000

WQN0223

01567000

WQN0214

223 720815

167 720111

219 720111

371 711002

192 711014

920903

920818

920908

920914

920909

0

66

0

267

0

--

0.08

--

.14

--

--

1.6

--

1.9

--

--

3.6

--

3.7

-

219

82

215

294

186

0.03

.01

.01

.01

.02

0.16

.04

.06

.08

.08

1.6

.36

.45

.50

2.1

0

15

0

9

0

-

0.10 1.6

-

.63 1.1

--

--

2.4

--

11

--

Lower Susquehanna

01568000

WQN0243

WQN0213

01570500

WQN0202

01571000

WQN0212

01572000

01573560

WQN0211

01573810

01574000

WQN0210

WQN0209

01575500

WQN0207

01575585

01576000

WQN0201

210 750925

131 730321

230 711014

1,006 711019

144 720502

359 841019

220 711014

749 800128

221 841022

233 711103

1,245 850927

263 720803

222 711015

152 711015

206 841019

224 711015

432 841019

215 720201

172 711104

891120

920908

920908

920819

920908

920926

920909

840906

920925

920908

920706

891213

920910

871222

891213

920910

891213

920917

920916

187

0

0

593

0

254

0

54

212

0

623

246

0

0

194

0

430

198

0

.70

--

--

.30

--

.30

-

.35

2.2

--

1.7

.54

--

--

2.6

--

2.1

.60

--

2.0

--

-

1.6

--

1.9

--

1.5

4.0

--

6.9

3.4

--

--

4.6

--

5.0

1.8

--

6.5

--

-

4.5

-

6.7

--

3.8

14

-

1,500

8.6

--

--

16

-

13

4.4

-

201

127

220

620

134

265

213

58

218

226

624

259

216

147

204

217

432

211

168

.01

.01

.02

.01

.02

.01

.02

.01

.02

.03

.04

.04

.04

.03

.04

.02

.05

.02

.02

.07

.04

.08

.07

.06

.14

.07

.05

.10

.13

1.0

.25

.18

.10

.15

.28

.28

.08

.08

1.7

.33

.93

.62

.55

1.6

1.8

.54

.92

1.7

66

13

2.4

2.3

2.2

4.3

3.5

.52

.85

0

0

0

177

0

13

1

50

12

0

8

9

0

0

1

0

0

0

14

..

--

-

.06 .98

--

.52 .63

1.2 1.2

.33 1.4

1.4 1.8

--

1.7 5.5

1.2 1.6

-

--

2.4 2.3

--

--

--

.02 .92

--

--

--

3.8

--

1.2

1.2

3.3

3.9

--

14

1.9

--

--

2.4

--

--

--

1.7
Appendix 6. Statistical summaries of water-quality concentration data for total nitrogen, total phosphorus, dissolved nitrate, and 

suspended sediment for all 127 load sites grouped by subbasin Continued

Site 

number

Minimum Maximum 

date date

Total nitrogen

n Min Median Max n

Total phosphorus

Min Median Max n

Dissolved nitrate

Min Median Max

Lower Susquehanna Continued

0157608335

01576085

WQN0205

01576754

WQN0231

01576788

01577400

01578310

SUS0109

1,198 840308 910925

1,707 820519 920926

166 711104 871221

671 841022 920917

225 711104 920916

126 790522 860902

516 851031 900927

685 780129 920902

220 740401 931214

679

1,118

0

660

0

77

263

562

92

0.95

.56

-

2.8

--

.48

.30

.30

1.0

9.3

9.4

-

7.9

-

3.4

6.1

1.8

1.8

80

62

-

30

-

6.8

61

6.6

3.6

680

1,129

165

663

222

76

266

573

199

0.08

.04

.03

.08

.05

.01

.02

.01

.01

1.9

1.5

.21

.50

.40

.06

.54

.05

.06

24

17

.99

5.2

1.8

.81

24

1.5

.48

189

312

0

14

0

79

0

345

212

0.02

.04

-

4.2

--

.02

--

.33

.14

5.9

4.3

-

5.2

-

2.5

-

1.2

1.1

11

14

--

8.2

--

5.0

--

4.7

9.3

Choptank River

01491000

01493500

CHO0626

550 711001 920924

83 730720 910530

225 740326 931209

348

0

83

.59

-

.24

1.7

--

1.8

3.8

-

2.4

369

70

194

.01

.03

.02

Patuxent

01591000

PXT0972

01594000

01594440

PXT0603

01594526

01594670

01594710

LXT0200

PXT0809

284 850904 920928

218 740403 931206

173 850905 920928

541 780130 920927

784 660111 931215

336 851009 920930

130 851017 920929

314 851008 920929

91 660110 820811

341 680715 931206

242

93

140

399

318

306

103

210

0

95

.15

1.2

.03

1.0

1.4

.33

.20

.30

--

.66

2.8

2.8

2.3

3.0

3.2

1.0

.64

1.8

-

1.7

14

4.2

6.4

8.4

8.4

3.2

6.3

10

-

3.7

235

195

136

404

666

315

102

203

76

314

.01

.01

LT

.04

.02

.03

.01

.01

.01

.01

.07

.08

.07

River

.06

.05

.06

.21

.37

.10

.11

.20

.07

.04

.91

.64

2.5

3.2

.92

1.5

1.5

2.1

2.3

1.2

3.4

1.9

1.8

225

6

209

222

207

134

335

651

308

94

205

72

320

.19

1.5

.03

LT

.15

.49

.17

.15

LT

.02

.02

.06

.02

1.0

1.7

1.0

2.3

2.0

1.4

2.0

2.3

.37

.12

.65

.94

.62

3.2

3.0

3.1

3.7

3.6

2.9

6.8

6.4

1.4

2.0

2.3

2.2

2.0
Appendix 6. Statistical summaries of water-quality concentration data for total nitrogen, total phosphorus, dissolved nitrate, and 

suspended sediment for all 127 load sites grouped by subbasin Continued

Site 

number

Minimum 

n date

Maximum 

date

Total nitrogen

n Min Median Max n

Total phosphorus

Min Median Max n

Dissolved nitrate

Min Median Max

Western Chesapeake Basin

GWN0115

JON0184

NPA0165

PAT0285

WGP0050

244 740326

316 740305

282 690616

215 660829

139 690708

931214

931214

931214

931214

830503

92 1.1

93 1.5

92 2.2

91 1.1

0

2.0

2.2

4.2

3.0

--

3.6

4.8

5.8

4.4

-

217

263

252

190

133

0.01

.01

.01

.01

.01

0.05

.04

.05

.10

.05

1.6

1.6

4.1

.81

8.0

234

289

271

204

132

0.06

.04

.04

.04

.05

1.5

1.5

3.0

1.9

1.6

3.6

4.6

5.7

4.2

2.9

Upper Potomac

01610200

ANT0044

CON0180

GEO0009

NBP0196

NBP0326

NBP0689

POT1184

POT 1830

POT2386

POT2766

SAV0037

WIL0013

1AABR000.78

1ADIF000.86

158 720215

238 660321

209 740318

322 740326

136 660726

355 660726

318 740327

243 690915

251 740318

204 740318

331 740416

113 740326

319 740326

171 760825

219 720706

791114

931201

931215

931206

850911

931207

931206

931207

931201

931215

931207

850910

931207

920916

920902

0

93 4.6

86 3.5

82 .82

0

85 .98

84 .85

92 .59

96 .32

87 .53

84 .41

0

80 .31

0

0

--

5.9

5.2

1.7

--

1.4

1.5

2.0

2.0

1.2

1.1

--

1.3

-

--

7.6

7.6

2.8

-

2.2

3.2

3.0

3.8

4.6

2.2

--

2.6

--

LT

204

189

232

88

247

191

221

204

152

226

59

198

119

49

--

.01

.01

.01

.01

.01

LT

.01

.01

.01

.01

.01

.01

.10

.01

--

.24

.18

.08

.08

.08

.04

.08

.06

.06

.06

.03

.04

.80

.10

--

1.6

.74

2.4

8.3

1.4

1.6

2.3

.83

1.5

1.3

.60

1.5

1.8

.30

31

220

200

231

115

236

222

224

227

178

233

108

228

LT

LT

LT

.02

.04

.02

LT

.01

.03

.02

.05

.04

.03

.09

.02

-

_

.40

4.4

3.8

.90

.64

.59

.57

1.2

1.3

.68

.60

.70

.65

--

1.2

6.9

6.0

2.8

1.5

2.8

1.9

9.8

61

4.6

2.7

1.4

1.9

--
Appendix 6. Statistical summaries of water-quality concentration data for total nitrogen, total phosphorus, dissolved nitrate, and 

suspended sediment for all 127 toad sites grouped by subbasin Continued

Site 

number

n Minimum 

date

Maximum 

date

Total nitrogen

n Min Median Max

Total phosphorus

n Min Median Max

Dissolved nitrate

n Min Median Max

Lower Potomac

01639000

MON0528

01643020

01646580

01647720

01650450

A7

BPC0035

CAC0148

MON0155

POT 1595

ST05

ST10

ST20

ST30

ST40

ST50

ST60

ST70

317

236

212

802

82

58

144

204

219

195

242

267

708

706

629

711

719

715

502

711029

660321

711026

730102

711124

711124

850514

660321

671017

780724

690916

741125

730207

730207

741125

730208

730206

730101

780712

920902

931201

920725

920901

750927

740820

921215

931201

931201

931201

931201

820419

921130

921130

921130

921130

921130

921130

921207

239 0.46 2.2 5.2

91 .44 2.7 7.0

123 .23 2.9 4.9

304 .23 1.7 9.8

o

o

o

92 2.1 4.2 7.5

90 .58 1.8 4.0

89 2.2 3.8 7.6

90 1.1 2.3 4.3

o

o

o

o

o

o

o

o

244

203

139

310

0

0

27

175

200

169

214

260

690

691

583

662

678

650

426

0.01

.02

.07

LT

-

-

.01

LT

.02

.03

.02

.01

.01

.01

.01

.01

.01

.01

.01

Shenandoah

1BCDR013.29

1BMDL001.83

1BNFS010.34

1BSSF003.56

190

140

209

216

740509

790430

711019

711118

920915

920914

920915

920915

o

o

o

o

21

103

63

106

.1

.1

.1

.1

0.22

.16

.21

.08

-

--

.08

.07

.11

.21

.09

.05

.05

.05

.04

.05

.06

.03

.03

River

.1

.2

.1

.2

0.91

1.1

.77

2.2

-

-

.37

1.5

.60

1.2

2.9

.33

.67

.70

.81

1.6

2.4

.86

.14

.4

.8

.4

4.0

95 0.09 1.4 4.8

218 .01 1.4 6.0

25 1.6 2.3 3.1

212 .04 1.3 4.5

o

o

27 .20 1.1 24

191 .30 2.9 6.8

205 .07 1.1 4.8

176 .15 2.4 5.4

213 .01 1.4 3.9

o

o

o

o

o

o

o

o

o

o

o

o
Appendix 6. Statistical summaries of water-quality concentration data for total nitrogen, total phosphorus, dissolved nitrate, and 

suspended sediment for all 127 load sites grouped by subbasin Continued

Site 

number

Minimum 

n date

Maximum 

date

Total nitrogen

n Min Median Max

Total phosphorus

n Min Median Max n

Dissolved nitrate

Min Median Max

Rappahannock River

01664000

3-RPP147.10

01668000

3-RAP030.21

3-ROB001.90

01673000

8-PMK082.34

01674500

197 711001

236 711003

433 711001

139 740909

215 730409

486 711001

358 790808

293 790410

860616

920914

920925

870617

920929

920925

920925

920924

o

o

316 0.1 1 3.6

o

o

336 .26 .66 3.0

o

271 .10 .59 2.8

0

40

315

24

39

340

281

267

--

0.10 0

.01

.10

.10

York River

.01

.02

.01

--

.10

.05

.10

.10

.06

.08

.05

-

0.6

1.1

.3

.7

.39

.40

1.2

154

0

270

0

0

296

202

164

LT

--

LT

-

--

LT

.06

.04

0.49 1.0

..

.60 1.1

..

-

.21 1.1

.22 .66

.13 .87

James River

02012500

2-JKS036.il

02019500

02035000

02041650

2-APP016.38

2-CWP002.58

2-JKS023.61

2-JMS117.35

2-JMS229.14

2-JOB000.39

2-MRY038.10

197 711001

103 790717

202 711001

789 711001

295 771228

139 890706

198 711021

172 790717

230 711005

261 711021

98 790717

209 711021

860514

880615

860516

920929

920923

920923

910702

920917

920922

920922

911104

920903

o

o

o

479 .04 .72 3.7

259 .10 .56 3.5

o

1 7.5 7.5 7.5

o

o

o

o

o

0

24

0

496

259

139

26

139

94

126

12

23

-

.10

-

LT

.01

.01

.10

.10

.04

.10

.10

.10

--

.10

--

.12

.04

.05

.10

.80

.10

.20

.10

.10

--

.30

-

1.5

.15

.30

.50

6.5

.60

.96

.60

.20

164

0

171

414

153

129

0

0

0

0

0

0

LT

-

LT

LT

.04

.04

--

--

-

-

--

.18 1.80

..

.20 .72

.29 1.1

.16 .53

.16 .53

--

..

..

..

..

--
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 7. MEAN ANNUAL YIELDS FOR 13 NUTRIENT AND SUSPENDED-SEDIMENT 

CONSTITUENTS BASED UPON HYDROLOGIC CONDITION FOR ALL 127 LOAD BASINS

[H, high flow; N, normal flow; L, low flow; --, no yield; yields in pounds per acre]

APPENDIX 7-99
Appendix 7. Mean annual yields for 13 nutrient and suspended-sediment constituents based upon hydrologic condition for all 127 lo

Station

01493500

01493500

01493500

01501000

01501000

01503000

01509150

01509150

01509150

01518000

fplp:;;;;: ;;

01518700

01518700

01518700

;.0ISi000|i|

01520500

01520500

01520500

::01J3;1000:i::':'

lllliiiK':'

01531500

01531500

01531500

lilli|::ii; 

01534000

01534000

01534000

Hydrologic Total Dissolved Dissolved 

characteristic nitrogen ammonia nitrate

sll^ilis

::::: H " __ - "- " .. >-- ............ 

L

N

Y',;::: : . ;£|f;:^^

^ ' C^'^i:i:::9^

H -- --

L

N

:"::::::::::: 2: Ifc ^"StT «? ":" -« : ' .: ;-:: ^; YY2II - : . 2 ; .;; ": ;»- ;; -- : ;-;^

S^

: '- H"' ^ - """""" "":: -

L

N

'"" """"""""H" '"""""" ""2.io"' ' "-'""" ' " ' """"-""""""""

L

N 1.47

E--;^|l^^^^p^ Sr£S^^5^^pB ............ . ^ .... .....,...,,_,..,.... ^ ... . . . ...,_...,,....,,,

L 4.35 .24

N 6.18 .23

L

N

Total 

nitrate

BIS

iiii

5.33

3.11

3.98

ijlii;;;

i:JJ7: :B::

Y:: M6^:-

4.52

2.74

4.25

 443, ,,:

3.25

1.84

1.96

""""2.00

-

1.89

iffli

lllOl^B

5.69

3.14

3.88

"4.54

2.16

2.70

Dissolved Total Total 

organic organic nitrate 

plus plus plus 

ammonia ammonia nitrite

-~ - 5.37

3.12

3.98

^-^^^iiE:^.:;'r ^""";^---'B:

^^S^PSS^i' 'H^.:: .:^

S::::lsi^

4.46

2.72

4.29

;; ^ ::.;.;.. rr . ,..... .,; : ; 2,64::: ...:::; : : -"

5^

..

: ;'. .'; .;' ;';';- - - - "- i^ii^YS1 ^1 ^:^^^^ x?:;:;" " '" ' . . 1 ^llM" " "

jSii^^^^^l^SS'.^ -: : . '

=;;3

..

1.50

;^

.........:. ; : : :,.' '.Y.:"^^ '' "S : 'SS ;^: "::S":tS::':i:i::tii j:^V::!'^ : :I:I :::,::X.W:Y:;:;:;:;:I:I:I:-:I:'"^: :..-'- -.- "

2.36 4.06 4.22

.71 1.21 3.67

1.71 2.69 3.50

i::lliSl^

..

..

Dissolved 

nitrate Total 

plus phosphorus 

nitrite

i||fe^

.-

 - :'^:^^---^;MM^,j^"

?:;:-U-^:^:S;^: i2^r"; :: -v

:'-'J^iS;:^3if;-''-;;:

..

..

-

: ... ~: : :: ::..56::.::.. : .:

::S%;^%;s^^

.42

.20

.22

'. : ;::||§|li||||

. : . . . . " !/:::; ': Y1" :'. .^ ;".".:; " ?"' '"'": J -^-m^f^ : : .-*-* : ...-..:

.11

.19

: ; ::: ^.. s£:::S;?:SPlCSi|^;il: gs

"'"' :: :: ' ::"'»S^SS^'rSS?S!5|^S *B2

,,.........,.,._,...,.........

.32

.40

 ....-:...: ';.: : Y.Y.;^- : ::'::-'s :i:i:.^;.;:;^:;:;i:;.;.::;S^iM?i ::::i::S>;^ ' 

llfiill|i:

.22

.30

Dissolved Ortho- 

phosphorus phosphorus 

ll|lii|;il;;

..

:;^T^^*-: ;;:;:..;.;::YEB::::BB;'*^^:'B.:Y'

^E^..S;--::Bj\H '': -^^^r-S

 ^'r:^^

..

..

-

:::;.:. ;; ;;--; ..2 :: ..:::::: ..; : :*s.: ':.:.::;: >:Y::

- ' : " - «,«, '" ' : '' ::.: .'. . . ', ^w '. ' ;i:i:i:i:' ': L '.

'"""''I" :;:;:;:::;^

- '; ; ;';';'; ......; '.' " v : ,Y " " : : - - - - - :i:i:i:i-1 -1 - . :'. ,, ,: . ,,,-^^0 V V ''. . : : : .":"::':i:i:

__-'- .;;;;;;;;;;"" " : "2" -" .. -:--'::-:i- ,,:.::2 Wfr :' :: ' : :::^_ .-V;: -

::;;;2;¥;:;:.-;:::r^

..

^^^ ^ ^IP^Pi^

.17 .07 

.15 .02 

.14 .05 
Appendix 7. Mean annual yields for 13 nutrient and suspended-sediment constituents based upon hydrologic condition for all 127 lo

Station

\&iy^iiji~=

01536000

01 *r? 6000

01536500

01536500

01536500

01537000

A "I - \t *7/V;li f\ ' U 1 J 3 f \f\f\f ::

01538000

01538000

01538000

01339000 =

01540500

01540500

01540500

015*1000 

01541000

01541200

01541200

01541200

01543000

01543000

01543000

Illliiill

01544000

01544000

01544000

IllililS;

Hydrologic Total Dissolved Dissolved 

characteristic nitrogen ammonia nitrate

'- -- >--<-&" " .» "* .,..-.-.: .~,- : --,::=^^

;':zz::-"3fc:^;.l : ...^ :^^^^--:-^ :^^±^-^

;;;;;;;;;;:;;:;:::;;:;.;;;M;.;. ::: :.;;,; ....,,..,...__..,,,.,.,...,.,,,.,.:.,,, ^ " ^ '"' ~: ::::.^-)::^"'" :z^'

H

L

N

;;s^i

H

L

N

S^^^^^^E^^^^'^^

H 9.04 0.50

L 5.11 .23

N 6.98 .41

M 

........ ....» .,,,. ,.,. . : ::: : :::::: ..... . ..::- .,.,,> 

................ ' ...., ..,,. ;..:::..--....,..,.. ....... . : , : ., , > 

 , . ;;;;., .... ;; . ; : -- ;;-> ; ; :: : I::::.:...:.........., .... ..,...;; < ^ ::: *

H

L

N

.,,;-:-: : : : : : : :- -.::::::;;:::: -f '.".'- - - - - :';"V";'v'; "'"JC";" :": :::':::::::.:::...:. '.'''.'...,.. . .^:.:..::.:.::;: : -:- :: "^:.^:.-J:'-^

H

L

N

IS^plgililiigs

H

L

N

:|i;l!i£±^BP :: S:;:EizS;|ii;i^^^^^^^^^^^^^^^^^^^^^

-^1 1 ^^S ^^S PS^^^^P

Dissolved Total Total 

Total organic organic nitrate 

nitrate plus plus plus 

ammonia ammonia nitrite

2: ;: :3^3 ::"-:---^"-:-:: :'::^-:: ^.:<ri^S3rr?w^:,:: .*:::::::::::'

m ;::*:-^-^----'-r-:-'-'-"----:--:^--:: :;;!o >;;;;; ; : :.:'3E^yt;'^i'-:---- :-------- ;.;;;.......;;....

4.19 - 7.66

2.69 - 2.94

3.54 - 4.02

...,;..2 .7^,.,,,,,:::.:::::::::;^,, ,:,. .; --: ;::;:...:,:;: .,..,,,. ..,;;;;.;;;;; ; ,;: ::;...

5.57

4.08

4.59

:,,, .;::,,::: :::::: """.:.;: ^'--^..-. .:........ .::: : :. -. -

4.92 4.21 4.35 4.69

2.85 1.60 2.62 2.77

3.80 3.92 3.78 3.92

.:,,.:.:.-..-..£?- ' f\?f : : ,;,-.,,,- ,- -'-, ----'- -- - - - ' -'- ^ " '~' : ' : : : ' : : : : ''''_ .\.\... ...,.'....... .:...:,:::, :,, ,,.. 

. ^.:.:J-.-*W--:f,,,,.,,,,,,,,--- : --,----'--^:-*^---: :::,: ----- ; '; ' "",:,::::,,:,:.

; ..,,,:,^,-.^^-.:v-.-.,,:;,:,::,,:-:-->: ' : ' :^ - ::'::: - : "' " ' .'.^^-'-- - ,,- ::-!--- -.«i': - " - '::

6.15 -

4.02

4.90

2.66

1.90

2.35

i i(»S::S;:^^^

-.

S^ffi^S^^ ^5SS*il i &^S

Dissolved 

nitrate Total Dissolved 

plus phosphorus phosphorus 

nitrite

:> :;::s

....^ -- >-:-::^'~

::. »». . ..::: ".. ^ v>.z !;-::if~':J!$U.:'Zm^^^^

.95

.39

.58

:^^

.74

.66

.82

::::E-: ;;5!:li:'S^^

5.04 .76 0.13

3.04 .34 .08

3.98 .50 .11

r^§W^§f^^^B

.34

.17

.31

.24

.14

.16

.18

.14

.16

Isffls^^^^sSSSisss^J

Ortho- 

phosphorus 

^K"-^£M^

; ; ;B:::} >---: -r ;;;;;;;;:;;;

::::": '"-"'":--^"::"::t: - ::::-- : --

^^^E

^=:^

0.08 

.04 

.10 

!l!i!

iiisss

^^^^y^

.ez"" '! '":; " ^^^^^^^^
Appendix 7. MeanamualyieUsfor
Appendix 7. Mean annual yields for 13 nutrient and suspended-sediment constituents based upon hydrologic condition for all 127 

Station

01555000 

0P15000

01555000

01558000

01558000

01558000

01562000

At S!£**fif\f\

01562000 

0156100

01567000

01567000

01567000

01568000

01I68000 

015i800|

01570000

01570000

01570000

01570500

01570500 

01570500

01571000

01571000

01571000

;;0:i:5fi500E; 

 ||I|i;5i)::;:: 

iiSIIiJEE

01572000

01572000

 YW VT^iOT"' " :

: M * :<J : / *3-*i? \?v , - "-.'.'...

iSiii-EE

::0i:l3Ji0E;i

01573810

01573810

01573810

Hydrologic 

characteristic

;;--=EEEH: :.:;:.:;::..: 

: ;.: :;: -EEL EEEEE

:::£:' EN : ;EE

H

L

N

-:: "..".= - iffEE'EE-

:- T ;:

,:,,-,,: -...-. !Lr" :: ..:..

EEE:::EE ;;N:;E : ;EE:

H

L

N

:^r~::;^; ;;;;;;;;Z

EEE: ;:EE-: ;kEE:EEE:

:; :: :;::::]Sr: "

H

L

N

:^::::::.::::. ;H E:E:: - ; :::

.EEEEEii;£EEE:;EE

"".'"-. - : - - - : - ' -- -' JN :i:i"1 EEEEE " ; E, " : : -

H

L

N

,,,-,,:::,: : ::-1 -:-i--- :i:i::-"i:i:i:iIXi::."."': : T"1 ":- ";;;;

.....,.,.. ,.,.,.,... ^

N

;...-::-:>*- - ------- i-JEE. :----'-..- - !.:.:.

EEE E E .E,.*J;J-'.. -*- - -* " ' " "'" "'" ''''' ''*'''

E- " " ;ESE£;;;;;:;:: """"""""""""""" H"

L

N

Total Dissolved Dissolved Total 

nitrogen ammonia nitrate nitrate

.. ....... j^^ :,,.,::.:.:.,,-:.:.:-.-.:.::.:-.-.:.:--.- ' *±±-_'_ ';';"" '.....;;.- : : -,," ---«,-. - :::' """ " "": JE^a / - -.-- --

^^^^^^/^^^^^

£E::~::.: E EEEEEEPiE-EE; : : E: : -: : EE EE 1.48 - --

 .. - 8.08

5.33

6.58

::iOJEE.E;E::E:li2E:=.;:::.;::.;i -EEE. E : 8.:71;:;;::::

^^^ -^^[^^^^'^..^^7

.......::,,,,"",..:.::: E E!E""EE ::: : --: ... :- \),J*T -^

- - - 7.22

3.74

5.62

'^3 .^^^L -7^^^j.:$^

^^^^ ^^r-^^:^:^J^

 ^ll!^;i;::iii=

""""-"" - - 14.8

10.1

13.0

:;:E=:-,:::.^^

::;:::;:::,. ^;: :::::.:.: .-;: - .;;: ::;:;: : ::. : : ,,:: ;::;E:: ;;; :-:::::%$3~..

:^^!F: ?:::: -;;': : ' :"^:;ii-'--i '~^"':::"' :- ::: :::-^^--;-^:': :i:::::-: : :4i^-- ' 

9.48 .17 -. 5.02

4.62 .07 - 1.72

8.00 .21 -- 3.66

EEEE3E-S^ = ^

 , -.: - .;; ; ;;;r:<i ;; ;::::g«:. . <=< ^i^j^:^;^ :z :;v.^^^*pz

19 J 1.07 11.4 12.3

4.52 .36 8.19 8.80

E;iII5 1 ;EEE:;;gl5sE I5i S iillll

-- ?i^::^EEE; EE EEE":-:E.E,^--^:^':': EE '^^ ^ . ^ >;;:= --^^f^^;^: 

1 I *T ft" ' - ' - - fW\---------------- 1:'::':-"'-"' ----.- -^ - . . ,,,..- - -. - ,: : - : - -l^fS-1 - 1 -*----- -:'"': :- 

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51.5 12^8 25.2

32.5 6.50 - 13.3

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26.8

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6.96 6.16

3.58 3.51

5.79 5.66
Appendix 7. Mean annual yields for 13 nutrient and suspended-sediment constituents based upon hydrologic condition for all 127 

Station Hydrologic Total 

characteristic nitrogen

'-'.-' f\'*t'~C"j A f\j\f\:. .".'.... ':'.'. .'...'... 

: :Ui::i? iMrWU

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01575000 

01575000 

01575500 

01575500

01575500

01575585

01576000

01576000

01576000

0157608335

0157608335

0157608335

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01577400

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10.5 

14.5

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1.30 17.8 17.2

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1.64 14.4 13.9

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organic organic nitrate 

plus plus plus 

ammonia ammonia nitrite

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8.48

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.31

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1.02

. - .31 .

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2.92

4.53

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4.77

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2.23

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phosphorus phosphorus 

wit

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1.22

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TJ 

m

D

><

N

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Ol

Station

01589440

01589440

01589440

01592500

01592500

01592500

01594000

01594000

01594000

Hydropic Total 

chayracteristic nitrogen 

Disso,ved 

ammonia

Dissolved Total 

n.trate mtrate

Dissolved 

organic

Tbta 

organic

Trtal Dissolved 

nitrate nitrate

nitrite

DisSoived

Ortho- 

.

01594526

01594526

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3.89

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4.75

8.31

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4.61

2.90

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7.67

4.05

6.11

3.32

1.08

1.94

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5.79

1.93

3.64

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=;iiii

3.21

1.11

2.63

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life

1.10

2.17

2.74

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1.32

4.02

6.09

3.33

1.15

2.75

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L

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15.7 

5.47 

11.4

1.19 

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6.10

3.74 

6.08

6.03 

3.78 

6.03

3.65 

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1.59

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12.7 

2.22 

4.04

6.07 

3.82 

6.06

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:£;^llil

6.80 

4.03 

6.42

SIMS-

.15 

.19

1.03

1.66

1.00

1.70 1.38

1.14

1.97

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1.54 1.60

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01594710 

01594710 

01594710

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L

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9.20

4.34 

5.76

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3.92 

2.58 

3.39

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2.56 .89 

3.44 1.68

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1.82 

2.36

J.92

2.54 

3.38

3.92

2.54 

3.38

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.21 

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.62 

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o.38

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0.68 

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2.43

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4.86 5:49

3-25 3.98

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1.10
Appendix 7. Mean annual yields for 13 nutrient and suspended-sediment constituents based upon hydrologic condition for all 127 

Station

01631000

01631000

01634000

01634000

01634500

01634500

01637500

01637500

01637500

01638500

01638500

01639000

01639000

01639000

01639500

01639500

01639500

01643000

01643000

01643000

01643020

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01646000

01646000

01646500

I1646500:;;:;,

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01646580

01646580

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3.61

3.19

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1.38

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1.74 3.55

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~

-

;;,:..,;:,-;:;::::::

::::;;»,- "

;:; .«:: z::

6.72

2.14

Dissolved 

nitrate 

plus 

nitrite

EE: : 2_g;E.:E

EE4.i6::S:E

-

-

;;..,-;::::

...:..:;;::*-::::-";:;

15.2

6.30

7.68

... 5.4%EEE: 

:: ::: 3 ,68 ; ;;

12.19

7.40

10.7

16.4

8.78E ; E

11.5

12.2

7.52

10.4

::::::;.::,-.. ;;:.

::::::;;;;:.:.--.:::;:::::::,:.

:rzzTiS^z:;

-

-

EEEliliFEE;

:^ : ;4:0iEE::E::

::::|::06: ::::::::::::

6.78

2.15

Total 

phosphorus

:: 0.32 ''.

::E;E:.:ji: :E:EEE.:

.39

.31

EE. "z -- E : z

Ez E:-"EEEEEE

-

-

-

E :,51 .::...- 

.24

.36

.92

.36

.64

EE ::::: ::

;: ; ;- :

::::;. .....

-

-

-

EEElll:EEz:E

:: ^ :5SEEE:EE

E::::::, 1.05: :::::::::::

.31

.62

:zzz^:;.» ';.::::::;z'-:: :

.; ".z:.,,:.. :.:. :.. : . EE: zE::i- . :

.80

.27

-: : :: --: -- : : ." " ' ' ' 

Dissolved Orthophosphorus phosphorus

m:rir_ , , ,,,,,, , ... ,.,. ::: _ ,A..:c:F:::: ,,,.........

^l^^iSiE^i^

 ;;;;;;.. -:z:z: :::::::: " $$ -:: 

-

E::::: --::::::::::::::::::::::::, 15 EE: : E

zz:^ E:; E::;:; .;:::::04 E ;E 

-

.12

.17

B^:^:^^--:-^

-EE -,::.: ::;;z; iEEEE-21 EEi

1.10

0.23 .33

.44 .56

: :=" : : : E...EE1 .09E .... E z

E. : E~z::; z =' .,31 ::r:-

- : : E EE42EE -E:

1.02

.36

.54

: ::::::--::: : :: E. E : :~EEE:: ::: 

: ;: - :::::-«:- ' ' ^- :=::::- :: :-lz E:^

;;:;: ;;;;^;^;;Zz zzz::::.:::^:z ::,-

-~ .23

.44

--:::::..E.EE :::^::::::::::E;; ;:Er::i32;:i;:::-:;"

:::E :: ;--;;EE^EEEEE:EliEEEE:: :::

.21 .12

.09 .06
Appendix 7. Mean annual yields for 13 nutrient and suspended-sediment constituents based upon hydrologic condition for all 127 

Station

01649500

01649500

01649500

;OI|lt45|;i«

01656100

01656100

01656100

A I jjC ^fi^flfY v i s?«?" *? v^

01656500

01656650

01656650

01656700 

116SPOO

01656725

01656725

01656725

01656960

01656960

01656960

01657415

01657415

01657415

;0165765l.:e

01651655

01664000

01664000

01664000

01666111 

01666500 1

01667500

01667500

01667500

Hydrologic 

characteristic

H

L

N

^SSSpifefeP^^SaKWi^

H

L

N

H

L

-iv^^gg

H

L

N

, .;... : ::,. M: [ --^: ~,

::.:;,,,:,:.::::.::.: .. "-'f^^:',^'"""- >

...,..,.,,.. ... . ** ;.: ::,,.:,» '

:: " :>N : H

L

N

^.^W:-::-:-

 ' ' ' ' -.- : " " T ::.::. : ::.:.::

H

L

N

: .?'* 

H

L

N

Total Dissolved Dissolved Total 

nitrogen ammonia nitrate nitrate

1.25

.74

.98

:x;Hv'5«;;::,^

;;:::::;;gi;:::. :^: *:y;fr:^;^:::-^]: - : ^.:;:a*«: .^^^"^': ;;;-i;;

.56

.15

.33

------ : ------::.:.:.:---,,,:, --"-------.',:,':,:::.:,:,. ...f.C""" : ' ..: ' '. " ' ' '..:;; -.". " - - ';- 7^^:^':\

'.'.- - .:.............:.. .. - .... ....f *-'*?- .... - ................. ---,---,-- --,:.- ,:,:.--;--;-;;-;;

""'"--" .48

.18

^^^^ ;:^'^:^Mf^^

.25

.09

.25

f .,:;,,;:;;-- -- - - .52::" ;' ' - . '"-- ' ;- ' ;-^~:.:.:::

;i""?s : i- ' '"-'"'" 32 " " " :::i^«»:: : ::: »i»« >*»

;.;,,:...,..,.._ : ... ...... :..^ . ^ «.-:--: - v .- :,:::. .::::: ..... : .......... .. ....... .....

' "": . : "'"" ' ' ' : '15 ' «- ' '' " " ^a ' - :'

1.00

.70

.41

:.:,::-: ;;: i--:;:l; .r:- ^^^::;^l.±,^S^::;^S

;;..: :::.::-i- """ . ::". .:l:it;:;:; »-. : : -» : '- ::: : " : : -^-:;;.;:;;:::;;

-'""""" 2.97 3.05

1.86 1.50

2.28 1.95

^^ "^^SS&L^~:-^^

..

..

..

Dissolved 

organic 

plus 

ammonia

--

-

-

lifcSSSB

:^::sggy:m

3.12

1.20

1.93

'-;-'* --*& :*:&4-[-_::_:_______ : 

\:.:A,».TT;4::... ..........

2.57

1.07

"""2.28"

.78

1.76

,::.s £;J::. : ;t;'^;:-:-:i::-::;

 :,,',,J,~nai]afSf^---.---,

^^' ': : :'|:!;i^: »» »';

3.30

1.45

1.99

 <^Z:''$i^f^'.

i; ,»fe is

-

-

-

-

-

Total Total 

organic nitrate 

plus plus 

ammonia nitrite

..

..

s^^a-':-;:--'^^:^

 "Z^^^::^:;.-:: :-^--:^::

5.34

1.75

3.54

3.63

1.65

:; : 3,97.::. ';: ; : ::::;;; ;:;,- ;: :: ; : 2.99 """-

1.15

2.69

::.. .4>4Q : "

::..::::|,89 -.;.'« :

;: ::2 39 -'

3.96

2.13

2.69

»;::.:::3;iO; ,;.:, ..-.;: ;: ::. :

;::;«;jYQ3 .' . ' " ": ' " ' -- ' '"

gip?:>^

1.28

1.17

.96

.72

.68

Dissolved 

nitrate 

plus 

nitrite

4.00

2.78

3.40

zyssisS"

:'::' :EESS:s

8.14

2.61

5.37

 -. - ^V.-jftiC.---1 -- ::"--.

'-'---- i3-*"*3- -.. - ...

1.87

.89

^IJ-S

20.4

4.52

12.0

 : :*$$ :-. ;,

2 03.;-.;;. . . . .,,,

1 56"" 1 "" '

5.00

2.88

5.42

:::::;.:ilf3i::;

 - .:. :30-:,; .:;;.: ::::

M

. ... ..:::.. 

. ?. -s.-:

3.08

2.15

2.08

-

-

-

Total 

phosphorus

-

-

SS@^K'>S'~

E^E'^".^::::::-..:'::::

0.74

.23

.40

-"-|">y,. ,:.:,... ....:.

 »'* * : . .

.39

.15

.25

.10

.21

 ;; .35;

; . . 28 :

,,*.:,::., . ::: .09 ,:.

.38

.35

.14

m^:M=^:.

"''" ''"'"'"'"'lO'""""""'""

=»:: ;. ;:

.28

.48

:;;:;:.;;;:;;'.';'.';;".__..'.'.'.'....:....:.'., ,

-

-

-

Dissolved 

phosphorus

-

-

-

" " ' : "":: ~:t ::::::.:::

0.51

.16

.27

09

.21

.06

: -58 :: : ,:

.18

.06

.16

 .28 .-.;;:

11 ...::; ~.: :

 ...-, j&u:.r:;:

.37

.37

.18

" -.....- ;»35 1 --"-1 -'--"-.:.:.:i:':!

" 06 ''' J

^^F^

-

-

-

-

-

Orthophosphoru

-

-

-

E;EEiiil3

^ :3;;;^Z^g

0.21

.07

.12

.--::-;:.::- f*£ ' '~* "' ' i:i:i:i:i 

... -...,,::...*%/". :.:.:......... 

.11

.05

S^;6?

.10

.04

.09

: : ::.";..i|8: :;::;:; .; - 

'.»,,I ,.:.:.':.'1O. '..'. .:. '.'..'.

';;>": " .. 

;;;..;.;;. 03"" "" 

.18

.23

.04

:E:siiI;E;:;:v

: ->-«"'':;:04;:;:< ;'- ; --r;v:'

.05

.04

.04

i:':: :: :: ;: :: :: :: ::;::: : : ::^; ^: i :^¥^: : j;: :':

-

-

-
Appendix 7. Mean annual yields for 13 nutrient and suspended-sediment constituents based upon hydrologic condition for all 127 

Station

01668000

01668000

01668000

01673000

01673000

01673000

01674500

01674500

02012500

02012500

02012500

02013100

02013100

02013100

02016000

02016000

02016000

02017500

02017500

02017500

02019500

02019500

02021500

02026000

02026000

02026000

02035000

02035000

02035000

02037500

02037500

02041650

02041650

Hydrologic 

characteristic

H

L

N ; H

L

N

H

 E,:L:

H

L

N

; :.. :,:..::.H~EEE-

. . .... ^ .

: N

H

L

N

: : : H ;E;E : ;.

: L

N

H

L

H

H

L

N

H

:;: LE:

N : H

N

E L. .

. ::: N : :

Total 

nitrogen

E .:. --;:;::;::::

E.3,45E ' :

:4iO E

2.80

1.34

2.56

: 2.16

.88

--

-

-

::;..«

: >- ;

-

-

-

-

; E- :, :--

--

--

-

-

; ;. -:T: ..

-

-

-

441

2.09

:4.:73::::

-

-

1.06

1.99

Dissolved 

ammonia

:::::..

0:13 E

:. .17

.17

.10

.16

.15

.06

--

-

-

.. .--

:. : 

-

-

-

-

:~ ...' 

-

..

-

-

.. .. 

-

-

-

:: ,17 :::::::

:;:E.10::E

: E -20 :£::£

-

-

.09

.14

Dissolved 

nitrate

3.06

:: :: 1M;E:E

 2;i7EEEE

.79

.38

.73

.64

.20 E

1.47

.90

1.39

« ..:

--:..:.

-

-

-

-

 : .:.

E--E E

-

1.27

1.10

;E Y. ; -- ..E.

-

-

-

: 1.57::: E.:E ;:

::E ; : .93 ;; ; : E::;

1.06

-

-

.33 :r

: ,94;:: E

Total 

nitrate

.:;;:::::..->..: ::::

.ii.46'-:::

: 2;00::::E

.83

.40

.58

.61

.21. : :: ;

.68

.74

1.34

.61

.44 E;

1.01

.79

.25

.85

: ::-::.55 E: E: ::.29 :

.70

.82

1.26

,50

1.66

.41

1.04

1.60

E..: E.;83; :E: E::1.28EE

1.08

.83

M i:

: -JiE:;

Dissolved Total Total 

organic organic nitrate 

plus plus plus 

ammonia ammonia nitrite

..::'--.:..::...;..,::::-: . - EE

:; :: E-E::EE: -- ::2:02: : r::: .,.::.::;;

"E:: - ;::EE :2.82; "-"" :::--: 

1.98 0.92

.93 .38

1.75 .35

E::EE::--::£::=:::; 1- 54 : E "

r;:;:::: r : :::: :::: : : : : : :E.67 '. : 

.83

.30

.67

EE-: .-.:;:== :,.89

E:-.-: E/- E:: :E : -.86-

1.39

3.10

.40

.69

-*:::: 1.58 - :

- ; ; .70

EE" : '..77 E-- -

; : :£-: - 1.08 ^ = - [ 

1.28

.56

1.05

s:: 1. 54 E 2:.97:;r ::: 1.:7J-::::

:;";:El.:v:j:8:;,;::::-,:::::::;l,27 E..EEE.,fl::;::::: ;

EEEE E..EE: -3. 55: :E :: '^H-:-

1.72

1.44

. E.-: ' :: : ;;::; ir~: ::. ::..::. :.:^.:" 36- - r : :

?: ^^.: :E3;i:?a8. " :: £ --: :::

Dissolved 

nitrate 

plus 

nitrite

! .E :: :: "

EE-l.tS:

:E: 2.16

.79

.42

.62

.63

.21 ; ;; : E

1.01

1.20

1.93

-- :

 .

-

-

-

-

..

« .: .

.88

1.34

-- , : :

-

-

-

'....:: iM E E ;:

------- -- :i- i- :vO'5"i:i ":i:i"1 "" " : " :

-

-

::;32:::: ;"

~I: 3iE/EE

Total Dissolved 

phosphorus phosphorus

r:E. .;:......:;..;.::.::.. :~. : «: :: :

ft (£"'') --- --E- -.-.--E.--.--.jpk.-lf\fii--"- - "": :-------

E :.77 ^ ; - E: E; E:v07 ::: E : E .:;:

.33 .07

.17 .05

.40 .20

::: .20 E ::.05 ::;:;::

::. ""tip ;:-;:;' ::.02 : : ;: : : :.

..

..

..

:::»..:

: K43 :- -

.76 - '

..

..

. :

;.. ..'- :::: : _:. ; :

. .. :E : __

-

.; ., .:.: ... .: :

.50

.17

.43

^.^E-^E; ;;:E: ;-28 :::E- : :

'; ,37 : : i!5 "'"".:]. '

." 394 : :: :^E: ;32;E: ;E E:

.47

.36

E- .09E. . :.;.: ::::...::;(J2;.:: ;..E.. : E : : .16:: : : m ::EE:E:

Orthophosphorus

:: E. ...' 

 Ov04 : E

t:; ::;06E: E

.11

.05

.11

.05

.02

-

.03

.08

-

1.35

.67

-

-

-

,18

,05

.12

.24

.86

: -- ; :: ;;

.28

.11

.30

:: ::: ,22 : : :;:

'--E^if-: '" :::;

:E. 34 ;:::::::::::::

-

-

::: ; .02;

::..'. 1m ""
SYNTHESIS OF NUTRIENT AND

110
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 8. SIMPLE STATISTICS FROM THE CORRELATION ANALYSIS RELATING MEAN

ANNUAL NUTRIENT AND SEDIMENT YIELDS FROM NORMAL FLOW YEARS TO LAND USE,

PHYSIOGRAPHIC PROVINCE, AND ROCK TYPE USING THE KENDALL TAU STATISTIC

Constituents: TN, total nitrogen; DNH4, dissolved ammonia; DNO3, dissolved nitrate; TNO3, total nitrate; DKN, 

dissolved Kjeldahl nitrogen; TKN, total Kjeldahl nitrogen; TNO32, total nitrate plus nitrite; DNO32, dissolved 

nitrate plus nitrite; TP, total phosphorus; DP, dissolved phosphorus; OP, orthophosphorus; SED, suspended 

sediment; TNH4, total ammonia; DNO2, dissolved nitrite.

Land use: FOREST, forest; AG, agricultural; HERBURB, herbaceous urban; WATER, water; EXPOSD, exposed; 

WETLND, wetland; URBAN, urban.

Physiographic province: APPL, Appalachian Plateau; APMN, Appalachian Mountain Section; GV, Great Valley 

Section; BR, Blue Ridge; RP, Reading Prong Section; MELO, Mesozoic Lowlands Section; PDLO, 

Piedmont Lowlands Section; PDUP, Piedmont Upland Section; CP, Coastal Plain.

Rock type: CARB, carbonate; SIL, siliciclastic; CRYST, crystalline; UNC, unconsolidated. 

LT: contains values reported less than the detection limit.

APPENDIX 8 ~ 111
SYNTHESIS OF NUTRIENT AND

Appendix 8. Simple statistics from the correlation analysis relating mean annual nutrient and 

sediment yields from normal flow years to land use, physiographic province, and rock type using 

the Kendall tau statistic

Variable

TN

DNH4

DNO3 : ; : j :

bi^fi:"-^'

'mm.:-^ i: j

TKN

TNO32

DNO32

TP

DP

OP 'jW3i!';- : r

.N^ftWi'.! ; : ! : J

; DW52. :N : J : ;

.FOREST';1 ;,"..

AG

HERBURB

WATER

EXPOSD

WETLND

^^ ^:

: AJto;'. ';';?

;GV M ';:'"-

^ :;'.:V N;;;

RP

MELO

PDLO

PDUP

CP

teARI= : /'.V:

SIL

£RYST ::;'

|;lJN ; I 1

Number

41

55

100

Mi

.'NlSSvV

70

29

54

102

33

55

; i 24 :

' ; ; 65 : h 1 24;: .;

; ^"P6. [;',";

125

121

110

102

44

111

111

111

Hi

111

111

111

121

118

69

103

52

19

Mean

11.4

.67

6.06

5.91

3.05

3.58

7.70

6.72

.68

.48

.36

651

.59

,06

i' : ' .55.2

34.2.

2.54

.58

.46

.05

31<K

;: 22.8; . ;

8.19

;.i . i -5.92:i :.- - :

.03

10.1

3.11

21.6

6.42

25.6

67.6

61.4

36.8

Standard 

deviation

9.102

1.43

 5,4"; ' [

" ; ; : 5.5i ; "; : "

' ! ' ' 3.42' : '. : . :|

3.91

6.39

5.68

.95

1.01

.89

583

1.79

.03

22.9

19.5

3.57

.47

1.00

.067

":'.4^r: ^';

: 35.8" .i :

21.5

14.5s- ..:-

.22

22.9

13.9

35.7

23.2

23.0

32.7

35.3

44.6

Median

8.31

: .27"

: 4,08

"":; 3.85 ; ;-M; ; :'

: " : ii4^ M j| :

2.68

5.57

5.08

.401

.20

.12 /;

450

.38

.05

59.4

31.5

1.00

.50

.10

LT

.' :i: ,' : ^; '!:i' i ; i

1 LT: . M; ,

; LT ' .

: :"LT ;:' : ,,

LT

LT

LT

LT

LT

18.0

78.0

70.0

: : : : H4^ : ;! ! - ; !

Minimum

1.47

;! ' : ' !$? \ l : i J

^"'jft:1 , / "

J". ; ; ?;., 5$: :;;';; ";

, : ;;";'.", 69 U.^ 1 "'

.52

.35

.62

.06

.04

: r :..(J2i : !; V.

69.2

.06

.02

3,40

4.00

LT

LT

LT

LT ' '' ^'w'l'^

;". ' ! LT : .

... wr.;;

.: ;:;' V ; lit fpf. hi!

LT

LT

LT

LT

LT

1.00

1.00

;" ^"^liOO,";",;

n'l^li^r^ii

Maximum

 n'39$;sv/'Nf

M^^^;1 !'; 1 ; 1 ^!

:M ! $&i$!rff.

':<ll&&l^li

: IJ: '^W^;;H:

22.4

27.6

27.2

6.33

5.79

r ' 5,66i f ;'' -:

2450 ;;.;' v: i:

10J7

J5

98.2

92.2

19.6

2.30

4.70

.20

100

100

100

:i^^Si!fii/ni

1.90

100

100

100

100

98,0

100

/i/jiopln^iiij

^.IMW'IMi

112 ~ APPENDIX 8
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 9. STATION, BASIN AREA, AND PERCENTAGE OF LAND USE, ROCK TYPE, 

AND PHYSIOGRAPHIC PROVINCE FOR ALL 127 LOAD SITES

[--, no data]

APPENDIX 9 ~ 113
Appendix 9. Station, basin area, and percentage of land use, rock type, and physiographic province for all 127 load sites

Land use Rock type Physiographic 

Station 

number

01491000 

01493500 

01503000 

01509150

01518000

01518700

01520000

01520500

01531000

01531500

01532000

01534000

01536000

01536500

01537000

01538000

01539000

01540500

01541000

01541200

01541500

01543000

01543500

01544000

01545000

01545600

01546500

01547500

01547950

01548408

01541100

^ ms&iK

i

Area

 113; ;;

12.fr

'l0.3

282;

446

298

770

2,530

7,800

215

383

332

9,960

32-4

43.8

274

11,200

315

367

:::::::- . . ^.pt^" :

; ::": v;;485;: ::::

;E;E245EE:E

E;; ::-23:3EEEE

46.2

87.2

339

152

12.0

I ISf §-

;« lIil:lEE

illiiSS

1

Agriculture

54-8

'"33*3"

;33:.l:

31.0

31.6

25.3

32.6

34.7

29.6

35.3

10.5

35.2

20.0

11.7

30.1

33.4

15.5

14.4

9,6

EE;§,6

" 1:6,1;.;

:f/:6::9"':

5"4,:6.-

4.0

50.4

32.4

29.6

51.8

illISi:::; E

1

iiil E

iiilEl

Forest

42.4 

. 6.2 

60.9 

56.9

62.6

64.9

65.9

68.7

61.3

59.6

68.2

53.4

64.2

61.3

53;0

73.7

68.9

59.6

77.6

78.1

83.8

92 J

92,7

E92,3;-:

94.9

95.9

31.8

59.5

68.2

47.4

;;;82,7 :

;: : ;;98.2.-: ff*f

l-8£0!

Urban

0.4

: 0 : -' 

:2.9::::

2.8

1.9

5.3

4.6

3.9

1.6

6.8

20.5

1.2

21,0

11.5

.5

4.7

1.9

1.9

.1.3 

: .8

: ; :-.2; : E

:::. . 3; "E::

:E-0 :: : :

0

13.9

5.6

1.6

.8

1.0

;;;;. :l,0;ir:

i|!

;;-S:i|ii

Herbaceous 

urban

%

E.:;:.:,4;

.3

.4

.5

.9

1.0

,1

2.7

1.5

1.1

3.9

1.1

.1

1.0

.4

.4

iii;:: :,2 -;

:iEEll

 EEEl-

;:EEEI.E

;:::;0:::.; :,:

0

3.9

1.5

.1

0

: l:EiIE

'''^Jy^.ii&tfzs 

FV^.^Vx.S'iiSriV:

t

- : ":-:-:-:-::---->;,:: :,;,:::,:L; 

«;,.;.,,,,,,:

Exposed

m

EE3;; ;::;:

.1

0

0

0

0

0

0

2.1;....

E-.1E'''

E:j:l:-

.4

0

.2

4.3

4.5

:::4.:l/--:

t 

:.:" '" 

::;::::";

>i3E:!:

;i!E:El::

: ;;;:0EEE;1

0

.2

.1

0

0

il3«*

I - IE::

1 1 1

S| lljl

Wetland

 !:p

:E0:;11

0

0

0

0

0

:1'0: :::

0

0

0

'E'0:i,

0

0

0

0

0

0

 ;:: '0EEE : 0::E :

r::0El:

:-.::0:::: ;

0

0

0

0

0

E10111

isl::::;

IllE:

Water

Ip

:-: : :::..E.8:E:..

.9

.4

.3

.7

.9

E.5

..I.?.

1.3

.. i.i : .ll

1.8

1.6

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1.0

.3

.6

 -' KQ.'^..

E:EESrE

7"-St:- : i

;.E-^i":;E

-""- :;:-.4:E:::

0

.1

.9

.5

0

r::'::: ';.3iE;

::;.:;;;;."".5:-::;

;i||l

-»-."";i::E:

Carbonat

...;..:. ...0..,,,,

0

0

0

0

0

9

-: :: 0

0

0

-- 7 ; --:;

::: ,..;;., :0::: : ;

0

0

6

98

0

;;;;;;::::::Q::-:-:

EEEff-:;l

~~'"Q~.

E;E:0H

: ;^0ir

0

83

45

0

0

,EEISS

-::-:::-:0 ::;

E:ii 1 

-I! ::

 ;:;p i

Silici- ( 

clastic

E|E

100

100

100

100

100

91

100

100

99

; 93

100

100

100

93

0

99

100

100

=1'99. ;

100

:300;;--

100

16

56

100

100

Sop;

SSli

1111

iliil

Crystalline

0 

0

0

0 ;

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

i,0 ;.E ;

^E:0.E E:

Illi::

11 PS i

Unconsolidated

100 

100

E ";E-0S

:. ---... Q ;::.

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

E: i <> . J

..;;.:,,::i;EE:

;lii

: ; lEft; 

Appalachian 

Plateau

9

IQ&ffl

100.0

100.0

100.0

100.0

100.0

100.0

99.5

43.2

E 55,2 :

0

0

23.9

48.4

100.0

100.0

100*0

EE1oo:0:;E

;EE:: :i:00;0:E;:

;; . ;::loo;0Eb;

:EE^00>tfEE

100.0

0

4.4

100.0

100.0

E: EloJil"

f :il0E0Ell

;: i;

Appalachian 

Mountain 

Section

E::::;:.;0

E- 0E

0

0

0

0

0

0

0

.5

56.8

44.8

100.0

100.0

76.1

51.6

0

0

:,,..... ...Q ;

,,,..,. .. jy: ; : .....

;EE ,0E. E

EElE:0-E;EE;

0

100.0

95.6

0

0

- ;i;lEg£::

i: ISliS!

'- §3 pSS

I 11 iSi;

;;: Si illGreat

Valley

0 

0 

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

o

0

0

0

0

0

0

0

0

So,::::

EE'.0:

Ifi

Es:0;i;

Blue 

Ridge

0 

0 

0 

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

o

.; : 0^: ::

,,;,..0"-

0

l.EO;: : 0

0

0

0

0

 ;.-;;y;0;E:

:ii0;;;; i

101

EllEE

Read

Pron

Secti

0 

0

:: :0::

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

:::0: 

S0;E

E:::0E

^OEE

:E-fE

0

0

0

0

0

izfr

11 

Si 

SO: 
Appendix 9. Station, basin area, and percentage of land use, rock type, and physiographic province for all 127 load sites Continue

Land use

Station 

number

01553500

01553700

01554000

01555000

01558000

iilSlllii

iillliilii

llllliiiE

Eiillllill;;

01571000

01571500

01572000

01573560

01573810

"::l|5^4iOIl

E psiloiiQ;;;:

;::;;i;i:i7SS@0EE

 iills^siasl

0I5?6|00

0157608335

01576085

01576500

01576754

01577400

""lti%rii(fW:::: 

.:»..M:i:;3:6,i3!iS^;::;~

iliiiilili

iiiil||||i

":::::iS'<:8Q'^{WS': -;.-W13B^J«Ws 

01589440

01591000

01592500

01593500

01594000

Area

6,847

51.3

18,300

301

220

liiip; 1 1

:;

!|iii; ;

lillii ;

11.2

216

34.3

483

.38

lEEliliil

EiEfifiEii

iliiiEii

EiEliEEE;

ISidffiiEE:

1.42

5.82

324

470

.43

i::.-::1::^.;^;^ ^1 -- ;"

I.:!:.-; i;;.:;:.:.:.:.:;:.^^^ $

""""""25.2"""

34.8

132

38.0

98.4

Agriculture

15.1

70.8

26.9

31.8

16.0

;;3Kf;;;;;;: 

illi

:siili

lllli

SIB;;;;;

26.4

35.3

47.4

50.0

91.2

EIii;i;

Eiili

Ei4li..-

isslji;::;;:;

;;29v8:::: : :

65.1

67.0

60.4

59.5

87.0

Eiii

;;.;^/v^;:v ,^

gStefis a

siiSi

illiii

"'"i1::**":"1 !*-" ::.::

Blifi;;:;::

22.8

53.3

48.0

23.8

37.0

Forest

80.8

26.7

67.2

66.9

77.3

iilii

iilii

liiil

illi;

28.4

54.6

51.6

40.2

6.7

iiSfi;

iiii!

-,-:&K

25.5

27.0

27.2

22.7

13.0

iifilif

psfi-if 

- ^:7>W s

39|i

45.2

43.7

20.7

32.8

HerbaUrban ceous Exposed 

urban

1.8

1.1

3.7

.6

5.6

liiElii

liiilE

=I31E

36.9

8.4

.6

6.4

2.1

iiiiii

llilil

.*i:8S: 3

9.2

4.8

9.4

14.5

0

; ;l|;i| |

llii i

31.8

.9

4.6

47.5

25.4

0.3

.2

.8

.4

.7

ll|i

C?2|||

iiiiii:

i:igE;; _ .

1.2

.2

2.1

0

Eiiil

lillEE

iiBIE

EEiil"

 ! if-i

.2

1.3

2.2

2.5

0

lisl

I ill

 ro ^^T.. &..::.

;::;:; ::: ^l^jH

6.1

.6

1.8

7.5

4.4

1.2

.4

.6

0

.2

111

iiii;

iiiii

::::::iii:::

0

.2

0

.9

0

iilii

Eiiiil

iiiiii

Iiiii

iiiii

0

0

.3

.2

0

Sfiisfe: si

ill i

t

= :".

,,,,,, . ..;*

0

0

0

0

0

Wetland

0

0

0

0

0

1111

liliii

iiiii

i;;;;|);.;;:::; o"

0

0

0

0

;::M=S

iiii

iiill?

lliii:

iiiii;

,__.

0

0

0

0

Illi

1 1 IIII

........_..

0

0

.1

0

Water

0.7

.8

.9

.4

.2

111

iilifii

SaliSI

Hipiis;

0

.3

.1

.4

0

ifcjte

iSlll

;;.i|;p|;

111=1

life

0

0

.6

.6

0

0

1.8

.6

.3

Rock type

Carbonate ^lllc.!~ Crystallin 

clastic

5

6

6

24

21

iiii

lEiiii

iiliii

=: !;fEr

 ;::,: , ..

34

0

13

0

iiiiii:

liiiE

; ;|||;;;|:

illil

iiil"^::: 50

50

44

59

0

iEllii

i illl

i ill

.. _.

0

0

0

1

95

94

94

76

78

11

;E;-:"ME

EEEE^sE

;:i::E91. :

91

20

100

85

100

EEEJ4E

ii-E'E

lE;,ii.E

liiili

1 ill::;

50

50

47

33

0

illl

illi

EBBajpE

E'VJ.,,,: ,,.: w,;::

0

0

0

0

0

0

0

0

0

0

lli

E. ;;;;El;E=

E;;:Eli;;

:;;;;::; : 0;;;:;;::

0

45

0

1

0

E;;»3i

^i-ig:;:;:;:

Eiifii

|;l0-i

EE::2;:. '1

0

0

8

8

100

iilii

 «*«»»

sjHi

Eliii

T"'Mg

'sMm ', 

72

100

98

100

98

Unconsolidated

0

0

0

0

0

iillll

i^iilEiiEEillllS:

^^s^i^iiE

0

0

0

0

0

:;;;;;;., :;;;;;;f:;:;.: ; |;:

==^lil':"

;ii:::::;;::f;;: ;;:'.E; : E:Ei::;:(|;;: ;,:;;:E

:7: : Q --:i:: »

0

0

0

0

0

:;|||i;l

!1 il; ^

illl 1

,::,,:: ________,.,.

0

2

0

1

Appalachian 

Plateau

33.6

0

65.0

0

24.3

I ill

S;: i;i:;:E:;:i

Ei!iE;i;;iiE;i

'""o

0

0

0

0

EilEliii

;:3E:Elfiiii

EE:li0Elii

E;:;iE-: l;EiE

: :::::::i.24ii:;:E

0

0

0

0

0

. ...._, .,.,,

0

0

0

0

Appalachian 

Mountain 

Section

66.4

100.0

35.0

100.0

75.7

iilWli;

iiii-ii

;;;;; iiijl;!;:;;;;;

18.2

0

100.0

43.2

0

lEi;OE-::.;;;E

:~;::;s :i&::^::s

...,,.---- --- -...../I:.------'-"-;----

i::::E:::iEE;;E;.

iii22;3E;;:;;

0

0

0

0

0

1 111

JE iil

""""Q""""' 

0

0

0

0

Great 

Valley

0

0

0

0

0

!ii!il

iiill!

EEllil

;;;;;; flip

81.8

41.5

0

55.1

0

:E i ill

Elite

;;;': ;;;: ; ii;:;

:; ;; f ~

\ Iiii

0

0

2.5

1.7

0

in

ill;

:: : 'f^-ll-- 

:: : ¥^ i

.__...........

0

0

0

0

Physiographic 

Blue 

Ridge

0

0

0

0

0

l|i!

iiiii

iiii

Eiipl

......

41.0

0

0

0

Eliii

;ilS;i

iiii

Sllli

Eliii

0

0

0

0

0

t

: :,.,:. j. ; ; ..

iiii ft

. Ill

 ?li ;E

0

0

0

0

0

Readi

Pron

Sectio

0

0

0

0

0

11

lii

lil

lil

0

0

0

0

0

Ills

|i;;;;

ifiE

iilE

iiii

0

0

1.9

1.3

0

fsSC

Sifcs 

ill 

111 

iiS^Si

0

0

0

0

0
Appendix 9. Station, basin area, and percentage of land use, rock type, and physiographic province for all 127 load sites Continue

Station 

number

01594440 

01594526 

01594670 

01594710 

01595500 

01597500 

01599000 

01600000 

01601500 

01603000 

01610000 

01610200 

01613000 

01614500

01616000 

01618000 

01619500 

01625000 

01631000 

01634000 

01634500

01637500

01638500 

01639011 

01639561 

01643000 

01643020 

01646000 

01646500 

01646580

; :::0i:64i|2p::

::::;ll:ii>|lli

I

1

Area

EE.EE.9J8.;. 

 1 3J4 

225 

106 

73.0 

596 

247 

875 

3,110 

155 

4,073

5,936 

281 

375 

1,642 

768

;£;; ;:EE66Jt

817

850 

57.9 

11,600 

11,600

E ill

:;:;: ^W::C" ":: : :

-5 lilt ?: ~ ipl s

Agriculture

Eil;5 

E.15..0 

13.2 

20.1 

12.7 

13.4 

14.7 

16.4 

15.2 

22.7 

24.5 

.21 .6

E42JE

29.2 

55.7 

58.8 

42.4 

40.2

EliSE 

EE0EEE

57.2 

57.2 

11.4 

38.5 

37.1

iiii

E1IE

Forest

18.9

. : 33:5;.; 

.:. 65v7E 

50.1 

73.8 

86.1 

74.5 

78.9 

79.9 

78.4 

73,9 

74,1

EEE11IE

66.8

32.2 

32.3 

52.5 

52.2

EES>5E

36.4 

36.4 

27.8 

57.9 

55.9

EEEiiiE

Urban

. 25 ,8 : 

: .26.8 ' '.

16.8 

1.6 

.6

6.7

3.2 

3.2 

3.8

2,2

2.7 

10.6 

4.9 

4.6 

3.4

EEEE.2EE 

EEELlE

EEiilE:

49

4.9 

50.9 

1.0 

4.4

Land use

Herbaceous 

urban

EEE71; 

EEEiO.0;

E.EI9.4:

0

.7 

.3 

.3

.5

: ,3

; : E2

1.0

.6 

1.2 

4.0 

0 

3.9

.8 

9.3 

1.8 

1.7

ll 111 

iESIi

Rock type

Exposed

E2E

3.4E 

.1

4.7 

2.1

.2 

1.5

.5 :; 

0

.3 

.3 

0 

0 

0

EEIE:E:- EEi. ;;;;;;

EEEE.2. : ;

::.::;:;::, 3

.2 

.3 

0 

.2

.2

ili;;iEE

lIlEEE

Wetland

EE:.!EE

EJE;;;;.;;

E:i:EE: 

EE0EEE

0 

0 

0 

0 

0

0 ;;;:;:

0 

0 

0 

0 

0 

0

EE0:: EE

0 

0

.1

0 

0

: :- ^IEWater

E.;;I:E 

.;:; A ;;;

.-.-.. -.,\f .-..-.- -;;;

.5 

0 

.9 

0 

.6

EEEI::

.5 

.1 

0

.5 

.5

EEIEEE 

EEIEEE 

EEEEIE 

;;E i;lE

.4 

.4 

.5 

.6 

.6

:0EE;;:

Carbonate

E::;E: :OE: EE

4 

3 

4 

2 

4

E;.E!OEEEE

19 

69 

69 

46 

50

1 "',,-:. ..' "E. IT"' ,:v...'"':

8 

8 

0

25 

25

E: EEiEEE:

Siliciclastic

==K

EEEEPE

EEEI:

100

96

97 

95 

98 

95 

87 

89 

86 

51 

29 

78 

6 

31 

33 

50 

E:E?8 : E;;;E;Q;;

EEfl ;

39 

39

2 

56

55

EEEPE

lll;: 

ili:

Crystalline

0 

0 

0 

0 

0 

0 

0 

0 

10 

0 

0 

25 

0 

20 

0 

0

100

0

54 

54 

98 

18 

18 

100

Unconsolidated

^Ife:

E|SE-::;:E

zlW::::::::1:1::::

100

0 

0 

0 

0 

0 

2 : 4 

2 E 

0

0

2 

0 

0 

0 

0

0

0

o

: o

..' OE:::::;

0 

0 

0 

0 

0

s:EiEEE

Appalachian 

Plateau

; ::r:;P::::::«

.:;: :: »»0»»»-:":'

100.0 

100.0 

79.3 

74.5 

75.4 

59.0 

0 

61.1

EoE...;

0

33.1 

0 

0 

0 

0

III

"""""" Q"

0 

0

25.3 

25.2

Appalachian 

Mountain 

Section

EEE* :::;:

 4).. .. ..

E:E2.7 

0 

0 

20.7 

25.5 

24.6 

41.0 

100.0 

38.9 

10.4 

: OEE : 

13.4 

0 

13.1 

43.7 

39.8

;;:;;; 98,1.:- ..

0 

0 

0

1.7 

1.7

_.,,,., .Q,.,,.,.,,. ..,.,

^ '^~^~-

^Siilsis:-::,

;:::.:;:::.:.,:.:::; :: y :::::. 

Great 

Valley

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

0 

79.7 

100.0 

51.0 

74.6 

86.9 

4.6 

60.2 

1.9 

0

EE-4.2

0 

0 

0 

2.6 

2.6

EEIEE

., ..,,: n .

::::::"": ::::: .

:,., , ,,..0.,.,:..

0

Physiographic p

Blue 

Ridge

EElE

= : i .0.:::::;:

::. IE;;; 

;;EI;;;;;;;

0 

0 

0 

0 

0

0

0

;;; o ;;

10,0

: ;;;;0EE

2.5 

25.0 

0 

51.7 

0 

: 0

41,9

17.7 

17.6 

0 

36.5 

36.4

EE^E

:. - 

Espl

Readin

Prong 

Sectio

:::;;;: 0:r::;:

r;. ;....;0,;.......::

E::O;E;

EE;O:E;

0 

0 

0 

0 

0

: E0EE 

0 

0 

0 

0 

0

. ,: V/:,,,:,,

A

,,;:0;,:,,::

l:;|

0 

0 

0 

0 

0

: :.:.:^ . 

f

"/r: 

;/ H«fes 
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

H

= o>§

1 i'l

DC C/5

=

jo 3 

co to

Q. Q_

§1

l§ 

5 8

0000 O <S \:p:: i :O! ip: ":CS>: NO O O O O ^ . ^ ^ .S^ ; l«i>, ' fN

O : \O < ' "^ - ^ ^. ': : ! SO v ^ ! NO ' <

in ON O O O '.ip j p rP. i.'St i JH ' p OO

O O O O O

. :

J'.^ NO i:C» :O O O O O O: .' * * i<J5

: ' : 1 : : :

o o o o o : ; « ON oo o o o o: o

o o o o o

>*f. >r«: #&, rn in (N OO (N

p oq (N 10 op. :O\

'

O OO I/TV; W: : ;«*H;i :(3s

ON ON vo O (N O O O 

in op ON

NO OO ON

^ ,- ^

O O O O O :

5 O O O O :Oi S<D O O O O

^ O O O O ::O :O: O: : O: O In i o o vi m *-* o vi rin; */">i o Pi "n NO

NO? NO NO o o o 'S ; S"O!i iO'. O o o

«|| , , fN fN fN f>J (S fN i ifN fN fN fN

APPENDIX 9 ~ 117
SYNTHESIS OF NUTRIENT AND

118
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

APPENDIX 10. LIST OF LOAD SITES IN BASIN ORDER IN THE CHESAPEAKE BAY BASIN

[This table corresponds to figure 18 on page 40.]

APPENDIX 10 ~ 119
SYNTHESIS OF NUTRIENT AND

Appendix 10. List of load sites in basin order in the Chesapeake Bay Basin

Site 

number

Basin 1 - Susquehanna

01503000

01509150

01520500

01531000

01518000

01518700

01520000

01531500

01534000

01536000

01536500

01537000

01540500

WQN0308

WQN0310

WQN0318

Basin 2 - Susquehanna

01541000

01541200

01541500

01543000

01543500

01544000

01545600

01547500

01547950

01548408

01548500

01549700

01551500

01552000

01553500

01553700

01554000

WQN0407

WQN0415

WQN0434

Basin 3 - Susquehanna

01558000

01562000

01567000

Latitude Longitude

- North Branch

420207

423004

420143

420008

415430

415709

415948

414555

413330

412133

411503

411651

405729

404952

410417

414245

754812

760738

770757

763806

770747

770656

770825

762628

755342

754441

755252

755346

763710

762825

760802

762814

- West Branch

405349

405741

405818

412448

411902

412406

412322

410306

410642

413851

413118

411625

411410

411930

405803

410342

405115

412125

405323

411910

- Juniata

403645

401257

402842

784038

783110

782422

781150

780612

780128

774128

773617

774209

771826

772652

771928

765949

765446

765236

764050

764821

763205

774740

775225

780827

781556

770746

Site 

number

Basin 4 - Susquehanna -

01568000

01570000

01570500

01571000

01571500

01572000

01573560

01573810

01574000

01575000

01575500

01575585

01576000

0157608335

01576085

01576500

01576754

01576788

01577400

01578310

Basin 5 - Choptank

01491000

01493500

Basin 6 - Patuxent

01591000

01594000

01594440

01594526

01594670

01594710

LXT0200

PXT0809

Basin 7 - Western Shore

GWN0115

JON0184

NPA0165

PAT0285

WGP0050

Latitude Longitude

Lower Susquehanna

401924

401508

401517

401830

401329

403215

401754

394906

400456

395514

395646

400107

400316

400847

400841

400300

395647

395327

394454

393926

385950

391648

391418

390806

385721

384852

383502

382837

391005

390700

392046

392345

393000

391844

393039

771009

770117

765311

765100

765354

762240

764005

770626

764313

764457

764520

764136

763152

755537

755920

761639

762205

761813

762750

761031

754710

760054

770323

764858

764136

764452

763620

764408

765105

765231

764404

763946

765257

764733

764039

120 ~ APPENDIX 10
SEDIMENT DATA FOR WATERSHEDS WITHIN THE CHESAPEAKE BAY DRAINAGE BASIN

Appendix 10. List of load sites in basin order in the Chesapeake Bay Basin Continued

Site 

number Latitude Longitude

Basin 8 - Upper Potomac

01610200

ANT0044

CON0180

GEO0009

NBP0196

NBP0326

NBP0689

POT 11 84

POT1830

POT2386

POT2766

SAV0037

WIL0013

1AABR000.78

1ADIF000.86

390318

392700

394256

392936

393717

393359

392321

385735

392605

394149

393218

393011

393941

391045

385833

784331

774355

774931

790242

784626

785021

791047

770833

774811

781036

782717

790729

784650

780510

771446

Basin 9 - Lower Potomac

01639000

01643020

01646580

01647720

01650450

A7

BPC0035

CAC0148

MON0155

POT 1595

ST05

ST10

ST20

ST30

ST40

ST50

ST60

ST70

Basin 10 - Shenandoah

1AABR000.78

1BCDRO 13.29

1BMDL001.83

1BNFS010.34

1BSSF003.56

394043

392316

385546

390659

390527

385730

393642

392532

392349

391624

384048

384219

383658

384456

384559

384916

385321

384650

391045

390440

381543

385836

385449

771406

772240

770702

770609

770311

765600

771419

773333

772107

773238

771725

772646

773316

773350

772452

772757

773414

774022

780510

781934

785144

782013

781236

Site 

number

Basin 11 - Rappahonock

01664000

01668000

3-RAP030.21

3-ROB001.90

Basin 12- York

01673000

01674500

Basin 13- James

02012500

02019500

02035000

02041650

2-CWP002.58

2-JKS023.61

2-JMS117.35

2-JMS229.14

2-JOB000.39

2-MRY038.10

Latitude

383150

381920

382132

381921

374603

375316

375236

373150

374015

371330

374731

374719

373341

373211

373023

375412

Longitude

774850

773105

775825

780544

771957

770948

795839

794045

780510

772832

794534

800003

773237

784939

800618

792500

APPENDIX 10 - 121