NRCS Geo-Hydro is an ArcView GIS interface to the WinTR-20 Version 1.11 hydrologic model. It operates with ESRI ArcView 3.3 and the Spatial Analyst extension. The interface is organized to complete the steps required to do a WinTR-20 hydrologic analysis. Using tools and menu selections, the user is guided step by step through the automated processes of defining the watershed boundary, dividing the watershed into sub-areas, developing cross sections, etc. The end result is a WinTR-20 execution with peak discharges, hydrographs, etc. Basic familiarity with NRCS hydrologic procedures and ArcView operations are helpful.
The data requirements are digital elevation, digital land use, and digital hydrologic soil group raster (grid) themes at a 98.425 feet (equivalent to 30 meter) resolution. A stream location shape file (such as available from the USGS National Hydrography Dataset) is optional but recommended.
These files require either a zip utility or Adobe Acrobat. Get download help here.
Fact Sheet (3 pages) (last updated March 20, 2009)
The Natural Resources Conservation Service used government funds to develop the NRCS Geo-Hydro software system. It may be downloaded for use and copying at no additional expense or license requirements.