Sourcewater Protection Subwatersheds
Subdivisions within a watershed. Subwatersheds are the sixth level (12-digit) of the hydrologic unit hierarchy. This file contains Hydrologic Unit boundaries and codes for the United States, Puerto Rico, and the U.S. Virgin Islands. The data are a seamless national representation of Hydrologic Unit boundaries at HU_12 levels compiled from U.S. Geological Survey (USGS) National Hydrography Dataset (NHD) and U.S. Department of Agricultural (USDA) Natural Resources Conservation Services (NRCS) Watershed Boundary Dataset (WBD) sources. These sources were based on state level stewardship efforts. The data were then imported into USGS National Hydrography Dataset Hydrologic Unit data structure. For Alaska, preliminary data for the HU_12 are available for Southcentral and Southeast Alaska subregions only.
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