U.S. Geological Survey
Open-File Report 03–145
Hydrologic Landscape Regions of the United States
By David M. Wolock
Hydrologic landscape regions (HLRs) in the United States were delineated by
using geographic information system (GIS) tools and statistical methods including
principal components and cluster analyses. The GIS and statistical analyses
were applied to land-surface form, geologic texture (permeability of the soil
and bedrock), and climate variables that describe the physical and climatic
setting of 43,931 small (roughly 200 square kilometers) watersheds in the United
States. The analyses then grouped the watersheds into 20 noncontiguous regions
(HLRs) on the basis of similarities in land-surface form, geologic texture,
and climate characteristics.
This hydrologic landscape regions dataset contains for each of the 49,931 watersheds
the (1) watershed identification number, (2) land-surface form, geologic texture,
and climate charcteristics, and (3) hydrologic landscape region number for each
watershed.
David M. Wolock, 2003, Hydrologic landscape regions of the United States:
U.S. Geological Survey Open-File Report 03–145, digital data set, available
on World Wide Web at URL http://water.usgs.gov/lookup/getspatial?hlrus
http://water.usgs.gov/lookup/getspatial?hlrus
For additional information contact:
David Wolock
U.S. Geological Survey
4821 Quail Crest Place
Lawrence, KS 66049-3839
Telephone: (785) 832-3528
Fax: (785) 832-3500
Email: dwolock@usgs.gov
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