Even though the system is point-and-click, basic familiarity with GIS operations and hydrologic analysis is recommended. The following software requirements are necessary to operate NRCS Geo-Hydro: ArcView GIS Version 3.2 or 3.3, ArcView Spatial Analyst Extension version 1.1 or greater, NRCS Geo-Hydro ArcView project and databases. NRCS Geo-Hydro is based upon the ArcView GIS program from Environmental Systems Research Institute (ESRI). The WinTR-20 computer program is used to estimate peak discharge and runoff volume from watersheds for use in designing water control structures and in determining impacts of changing land use on the hydrologic system. These data are available for much of the United States through the NRCS Geospatial Data Gateway and other sources. The user may also import any other layers which would be useful in locating a watershed such as political boundaries, roads, etc. A stream location layer is optional but recommended. Required GIS layers which need to be developed by the user for import to the interface include elevation, land use, and hydrologic soil group. The NRCS Geo-Hydro system will develop input for the Natural Resources Conservation Service (NRCS) WinTR-20 hydrologic model from GIS data.
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