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<br />. Stream system computations for specified precipitation <br />depth-area storm relationships for the entire watershed or <br />region (application of modelling capability); <br />. Specialized precipitation streamflow network simulation <br />relative to multiple floods for multiple plans of basin <br />development and the economic analysis of flood damages <br /> <br />(evaluation of management alternatives). <br /> <br />In the process of modelling a basin, the program provides several <br /> <br />techniques for inputting and distributing the precipitation, treating <br />the preCipitation as rainfall or snowfall, computing rainfall and snow- <br />melt losses and excess, determining subbasin outflow hydrographs from unit <br />graph techniques, and routing hydrographs by storage routing methods. If <br />necessary, different techniques for each process may be combined in the <br />same job for the basin being modelled. Graphical display of intermediate <br />or summary hydrographs and preCipitation can be produced where desired. <br />The program may be used to optimize specified parameters of the precipi- <br />tation runoff or routing processes for a stream reach or subbasin to achieve <br />a best-fit with respect to an observed hydrograph and known precipitation <br />or a known inflow hydrograph. <br />The precipitation depth-area stream system computation is designed to <br />compute a consistent hydrograph at all desired points in a complex basin so <br />that each corresponds to a specific depth-area relationship. The procedure <br /> <br />operates by computing simultaneously a maximum of five base floods, each <br /> <br />. <br /> <br />4 <br />