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<br />Existing and future urbanization are shown on plate 5. The land <br /> <br /> <br />use patterns were slightly altered to fit hydrologic subareas in the <br /> <br />SWMM model. <br /> <br />. <br /> <br />Any changes in these land use projections and future urbanization <br /> <br />boundaries would change the hydrologic and hydraulic d&ta presented in <br /> <br /> <br />this study. <br /> <br />The percent of imperviousness of each catchment was estimated for <br /> <br /> <br />existing, projected urbanized, and total urbanization conditions. <br /> <br /> <br />Table 20 lists the percent of imperviousness for each land use that was <br /> <br /> <br />considered in the model. <br /> <br />Table 20 <br />Percent Imperviousness For Land <br />In The Sheep Draw Basin <br /> <br />Uses <br /> <br />Land Use <br /> <br />Impervious Area <br />(percent) <br />90 <br />40 <br />5 <br /> <br />CommercLll <br />Medium Density Residential <br />Agricultural <br /> <br />DISCHARGE-PROBABILITY RELATIONSHIPS <br /> <br />The 10-, 50-, 100-, and 500-year flood discharges for existing, <br /> <br /> <br />projected, and total levels of urbanization are presented with and <br /> <br /> <br />without the dams in place in tables 21 and 22" respectively. <br /> <br />44 <br /> <br />. <br />