Abstract

National Hydrography Dataset Plus (NHDPlus) Applications Sampler
Track: Water Resources
Author(s): Tommy Dewald

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 multi-agency 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 to develop a suite of geospatial data products, including a stream network (based on the 1:100,000-scale NHD) with improved networking, naming, and "value-added attributes", such as stream order. NHDPlus also includes elevation-derived catchments (drainage areas) for each NHD reach, a flow direction grid, a flow accumulation grid, and National Land Cover Dataset attributes assigned to the catchments. This presentation will provide an overview of significant NHDPlus applications developed since NHDPlus was first released in 2006.

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