Flood-Inundation Map for the West Branch Delaware River, Delhi, New York, for a flood

corresponding to a stream stage of 9.0 feet (1,359.82 feet, North American Vertical Datum

of 1988) at the U.S. Geological Survey streamgage at West Branch Delaware River

upstream from Delhi, New York (Station 01421900) 

By

William F. Coon and Brian K. Breaker

2012

DELHI

01422000

01421900

74°56' 74°55' 74°54' 74°53'

74°56' 74°55' 74°54' 74°53'

42°18'

42°17'

42°16'

42°18'

42°17'

42°16'

EXPLANATION

Flood-inundation area and depth of water, 

Flow arrow—Indicates direction of

water flow

Current U.S. Geological Survey streamgage 

and identifier

Discontinued U.S. Geological Survey 

streamgage and identifier

in feet

NORTH AMERICAN VERTICAL DATUM 1988 (NAVD88)

SCALE 1:20 000

1

1

0

1000 0 1000 2000 3000 4000 5000 6000 7000 FEET

0

0.5

0.5

1 MILE

1 KILOMETER

DISCLAIMER

Inundated areas shown should not be used for navigation, regulatory, permitting, or 

other legal purposes. The USGS provides these maps “as-is” for a quick reference, 

emergency planning tool but assumes no legal liability or responsibility resulting 

from the use of this information.

UNCERTAINTIES AND LIMITATIONS FOR USE OF FLOOD-INUNDATION MAPS

Although the flood-inundation maps represent the boundaries of inundated areas with a distinct line, some uncertainty is associated with these maps. The flood boundaries shown were estimated on the basis of stages (water-surface elevations) at the USGS streamgage 01421900 on the West Branch Delaware River upstream from Delhi, New York. Water-surface elevations 

along the stream reach were estimated by steady-state hydraulic modeling, assuming unobstructed flow, and using streamflows and hydrologic conditions anticipated at the USGS streamgage. The hydraulic model reflects the land-cover characteristics and any bridge or other hydraulic structures existing as of March 2012. Unique meteorological factors (timing and distribution 

of precipitation) may cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations in the water-surface elevations and inundation boundaries shown. Additional areas may be flooded due to unanticipated conditions such as: changes in the streambed elevation or roughness, backwater into major tributaries along a 

main stem river, or backwater from localized debris or ice jams. The accuracy of the floodwater extent portrayed on these maps will vary with the accuracy of the digital elevation model used to simulate the land surface. Additional uncertainties and limitations pertinent to this study are described in the document accompanying this set of flood inundation map plates.

If this series of flood-inundation maps will be used in conjunction with National Weather Service (NWS) river forecasts, the user should be aware of additional uncertainties that may be inherent or factored into NWS forecast procedures. The NWS uses forecast models to estimate the quantity and timing of water flowing through selected stream reaches in the United States. 

These forecast models (1) estimate the amount of runoff generated by precipitation and snowmelt, (2) simulate the movement of floodwater as it proceeds downstream, and (3) predict the flow and stage (water-surface elevation) for the stream at a given location (AHPS forecast point) throughout the forecast period (every 6 hours and 3 to 5 days out in many locations). For more 

information on AHPS forecasts, please see: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf. 

High : 8.2

Low : 0.0

01421900

01422000

U.S. Department of the Interior

U.S. Geological Survey

Suggested citation:

Coon, W.F. and Breaker, B.K., 2012, Flood-inundation maps for the West Branch 

Delaware River, Delhi, New York, 2012: U.S. Geological Survey Scientific 

Investigations Map 3216, 9 p. pamphlet, 10 sheets, scale 1:20 000.

Prepared in cooperation with the

Village of Delhi, New York;

the Delaware County Soil and Water Conservation District;

and the Delaware County Planning Department 

Scientific Investigations Map 3216

Sheet 3 of 10

Pamphlet accompanies map

Base from New York State Plane Eastern Zone, 

units feet. North American Datum of 1983 (NAD 83)

Orthoimagery from ERSI base-map download of 

Bing Maps Aerial Imagery (January 11, 2012)

Publishing support provided by:

West Trenton Publishing Service Center

Manuscript approved for publication June 4, 2012

For more information concerning

this publication, contact:

Director, New York Water Science Center

U.S. Geological Survey

425 Jordan Road

Troy, NY 12180

(518) 285–5600

Or visit the New York Water Science Center Web site at:

http://ny.water.usgs.gov/ 

This report is available at: http://pubs.usgs.gov/sim/3216/. 

Any use of trade, product, or firm names is

for descriptive purposes only and does not

imply endorsement by the U.S. Government.

This and other USGS information products are available at:

http://store.usgs.gov/ 

U.S. Geological Survey, Box 25286

Denver Federal Center, Denver, CO 80225

To learn about the USGS and its information products visit

http://www.usgs.gov/ 

1–888–ASK–USGS

NEW YORK Schoharie County

Delaware County

Upper West Branch 

Delaware River Basin

Village boundary