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Hydrogeomorphic Regions in the Chesapeake Bay Watershed.
Entry ID: USGS_hgmr

Abstract: This data set was used to compare base-flow and ground-water nitrate loads to
assess the significance of ground-water discharge as a source of nitrate load
to non tidal streams in the Chesapeake Bay watershed.

Generalized lithology (rock type) and physiography based on geologic formations
were used to characterize hydrgeomorphic regions (HGMR) within the Chesapeake
Bay watershed. These HGMRs were ... View entire text
Data Set Citation
Dataset Originator/Creator: Brakebill, J.W. (ed); Kelley, S.K. (ed)
Dataset Title: Hydrogeomorphic Regions in the Chesapeake Bay Watershed.
Dataset Release Date: 2000-01-01
Dataset Release Place: Baltimore, MD
Dataset Publisher: U.S. Geological Survey
Version: Version 1
Data Presentation Form: map
Other Citation Details: USGS Water-Resources Investigations Report
Online Resource:
Data Resolution
Latitude Resolution: 0.002
Longitude Resolution: 0.002
Originating Center
Data Center
Water Resources Maps and GIS Information, Water Resources Division, U.S. Geological Survey, U.S. Department of the Interior Supplemental Info
Data Center URL:

Data Center Personnel
Phone: 703-648-4000;1-800-426-9000
Email: h2oteam at
Contact Address:
USGS National Center
Water Resources Division
12201 Sunrise Valley Drive
City: Reston
Province or State: VA
Postal Code: 20192-0002
Country: USA
Distribution Media: ftp
Distribution Size: 9520210 bytes
Distribution Format: ArcInfo export format
Fees: No fees

Distribution Media: ftp
Distribution Size: 2416304 bytes
Distribution Format: SDTS
Fees: No fees
Phone: 888-826-3130
Email: jwbrakeb at
Contact Address:
8987 Yellow Brick Road
City: Baltimore
Province or State: Maryland
Postal Code: 21237
Country: USA
Berg, T.M., and others, 1980, Geologic Map of Pennsylvania: Pennsylvania
Department of Environmental Resources, scale 1:250,000, 2 sheets.
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Extended Metadata Properties
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Creation and Review Dates
Last DIF Revision Date: 2017-08-23