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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />SWMM can be used to predict the hydrologic change due to a modified land use <br /> <br /> <br />such as urbanization of an undeveloped area. This is done by changing the <br /> <br /> <br />physical parameters which are used to describe the watershed area. <br /> <br />The SWMM version utilized by the Urban Drainage and Flood Control District <br /> <br /> <br />is one modified by the Missouri River Diversion of the U.S. Army Corps of <br /> <br /> <br />Engineers in September, 1974, to incorporate trapezoidal overflow sections <br /> <br /> <br />with gutters and pipes and to provide for storage reservoirs. The infiltra- <br /> <br /> <br />tion algorithm is modified to limit the infiltration rate so as not to exceed <br /> <br /> <br />the current rainfall intensity, The infiltration values recommended in the <br /> <br /> <br />Urban Storm Drainage Criteria Manual were used as input for the hydrograph <br /> <br /> <br />computations. <br /> <br />Typical hydrographs generated by the SWMM program are shown on Figures B-2 <br />through B-7, <br /> <br />