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57 Study Units within the conterminous United States are represented by this GIS coverage from the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program. It contains boundaries, names, starting dates, and standard abbreviations for each unit, compiled from hydrologic and state boundary sources. The data was developed for a program initiated in fiscal year 1991 to assess national water resources.
Primarily for display and national-scale analysis; not suitable for local/regional work. Can be used with other NAWQA datasets like NAWQA_TE and NAWQA_NU point coverages.