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<br />\ <br /> <br />representing average rainfall intensity corresponding to a specified <br /> <br /> <br />area size, An interpolated hydro graph is automatically established for <br /> <br /> <br />each concentration point based on the size of the area tributary to that <br /> <br /> <br />point. This routine is useful in stream systems or in urban storm <br /> <br />drainage computations where it is desired to compute a number of synthetic <br /> <br />events ~uch as a lOO-year flood) at a large number of locations. <br />The routine for evaluating reservoir and channel development plans <br /> <br />for one or more locations includes the computation of average annual <br /> <br />dollar benefits at each damage center for each plan of development as well <br />as for existing conditions. This involves simultaneously computing a number <br /> <br />of system floods for each plan, covering the entire range of floods that <br /> <br />significantly contribute to damages. The floods may be either multiples of <br />the runoff from a single representative storm or the runoff from multiples <br />of a typical storm rainfall pattern. Flow-damage relations for each type <br />of damage and flood-peak frequency relations for existing conditions must <br />be specified for each damage center. Unit hydrograph coefficients, loss <br />coefficients, degree of imperviousness and routing coefficients for each <br /> <br />plan must also be specified. <br /> <br />Modelling Rainfall-Runoff with HEC-l <br />The program is designed to simulate the storm rainfall-runoff <br />process and is composed of the appropriate mathematical relationships and <br />constants that describe the response of the watershed to rainfall. The <br />model accepts total storm rainfall for each subbasin, deducts losses to <br /> <br />determine rainfall excess, transforms the excess to streamflow by the <br /> <br />5 <br />