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description:
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Abstract: This file contains Hydrologic Unit (HU) polygon boundaries for the United States, Puerto Rico, and the U.S. Virgin Islands. The data is a seamless National representation of HU boundaries from 2 to 14 digits compiled from U.S. Geological Survey (USGS) National Hydrography Dataset (NHD) and U.S. Department of Agriculture (USDA) National Resources Conservation Service (NRCS) Watershed Boundary Dataset (WBD) sources. Purpose: This data is intended primarily for geographic display and analysis of regional and national data, and can also be used for illustration purposes at intermediate or small scales (1:250,000 to 1:2,000,000). |
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tags:
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["a-16","ngda","water \u2013 inland","hydrography","NHD","water","drainage","river","stream","canal","ditch","lake","pond","reservoir","swamp","marsh","spring","well","dam","gage","WBD","HU","hydrologic unit","region","subregion","basin","subbasin","watershed","subwatershed","United States","US","NGP-TNM","REST","WMS"] |