Tuesday, October 27, 2009


Know Your Watershed Impact Zones

Web Services and the National Hydrography Dataset Plus

A variety of Web services that leverage the National Hydrography Dataset Plus (NHDPlus) and information linked to the underlying NHD are now available or planned for the near future. The NHDPlus surface water drainage network enables Web-based up/downstream query of water quality information, including water quality assessments, water quality impairments, and permitted dischargers. This presentation will describe a collection of such Web services that are being delivered by the USGS and the USEPA.

Alan Rea, USGS, and Thomas Dewald, U.S. EPA

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