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Federal
Attributes for NHDPlus Catchments (Version 1.1)for the Conterminous United States: Contact Time, 2002 recent views
Department of the Interior —
This data set represents the average contact time, in units of days, compiled for every catchment of NHDPlus for the conterminous United States. Contact time, as... -
Federal
National Stream Quality Accounting Network and National Monitoring Network Basin Boundary Geospatial Dataset, 2008-13 recent views
Department of the Interior —
This dataset and the accompanying Data Series report was created to assist in analysis and interpretation of water-quality data provided by the U.S. Geological...