Hydraulics and Hydrology
Tools and Models - NRCS Geo-Hydro

NRCS Geo-Hydro is an ArcView GIS interface to the WinTR-20 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.

Please send comments and questions to the NRCS Geo-Hydro Development Team: NRCS_Geo-Hydro_Development_Team.

A Common Computing Environment (CCE) version of NRCS Geo-Hydro will soon be available to NRCS employees through the CCE web site.

Downloads
These files require either a zip utility or Adobe Acrobat.

Fact Sheet  (3 pages) (last updated April 27, 2005)

NRCS_Geo-Hydro Software and Documentation.zip,  17 MB (last updated May 18, 2005)

NRCS_Geo-Hydro sample data.zip,   76 MB (last updated May 18, 2005).  Unzip this file to the C:\ root directory. 

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.

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