AbstractWhat's Happening with the National Hydrography Dataset Plus?Track: Water Resources Author The National Hydrograpy Dataset (NHD) provides for mapping hydrologic features, linking water information to the national surface water drainage network, and up/downstream modeling. NHDPlus is the outcome of a joint U.S. Environmental Protection Agency and U.S. Geological Survey effort aimed at developing NHD stream flow volume and velocity estimates to support pollution fate-and-transport models. NHDPlus extends the NHD by integrating it with the National Elevation Dataset and the Watershed Boundary Dataset to develop a suite of geospatial data products, including a stream network with improved networking, naming, and "value-added attributes", such as stream order. NHDPlus also includes elevation-derived catchments (drainage areas) for each NHD reach, catchment attributes (such as temperature, precipitation, land cover), flow direction grid and accumulation grids, and the streamflow volume and velocity estimates. This presentation will provide an overview of NHDPlus status and plans as well as a selection of noteworthy NHDPlus applications. Tommy Dewald USEPA - Office of Water 1200 Pennsylvania Avenue Washington, District of Columbia 22203 United States Phone: 202-566-1178 E-mail: dewald.tommy@epa.gov |