Computer program developed by the NRCS that provides a hydrologic analysis of a watershed under present conditions. Output consists of peaks and/or flood hydrographs. Subarea surface runoff hydrographs are developed from storm rainfall using the dimensionless unit hydrograph, drainage areas, times of concentration, and NRCS runoff curve numbers. Instructions to develop, route, add, store, divert, or divide hydrographs are established to convey floodwater from the headwaters to the watershed outlet.