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The NRCS Hydro has developed input for the Natural Resources Conservation Service WinTR-20 hydrologic model from GIS data. Required GIS layers include Digital Elevation, soil data, land use, and stream data. The WinTR-20 computer program is used in NRCS 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. NRCS Hydro automates the process used in a typical watershed hydrologic analysis. The major procedure includes delineating the watershed boundary, subdividing the watershed into sub-areas based on watershed heterogeneity and locations where peak discharges and/or hydrographs are desired within the watershed, estimating hydrology for each sub-area, and estimating length and cross section rating tables for channel routing reaches. Steps in this procedure have been automated to take advantage of geographic and hydrologic data and efficient GIS processing capabilities.