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<br />rratfng Block" Storm Arrangement <br />Locoticln ~Iorthwest of Denver <br /> <br />. <br /> <br />. <br />~ 7 <br />'" <br />. <br />z.. <br />. <br />. <br />-:;, <br />E- <br />o <br />-, <br />. <br />~ <br />~3 <br />~ <br />E- <br /> <br />=t'~ <br />10 JO !lO 70 90 110 1-'0 150 170 190 210 230 2!lO 270 290 310 JJO 300 <br />Tim. In t.4inut.. <br /> <br /> <br />, <br />~ <br />o <br />a' <br />'" <br /> <br />Figure 7,1 <br /> <br />- <br /> <br />3,7,2 Colorado Urban Hydrograph Procedure (CUHP), An anemalive method <br />commonly used along the Front Range to temporally distribute rainfall amounts is to place <br />the larger incremental amounts more heavily towards the front of the design storm, This <br />method is based on the observation that very intense rainfall in the area resuns from <br />convective storms or frontal stimulated convective storms, These types of storms are often <br />less than one or two hours in duration and can produce brief periods of high rainfall <br />intensities, For more detailed intormation on this arrangement see Urban Storm Drainage <br />Criteria Manual by the Urban Drainage and Flood Control district. <br /> <br />3.7,3 Soil Conservation Service (SCS) Method. The U.S, Department of <br />Agricunure, SCS, has developed 24-hour synthetic storm hyetographs for United States, <br />The Type IIA rainfall distribution is recommended for use in Colorado, This distribution in <br />terms of the ratio P, /P24 (precipitation at time t over 24-hour precipitation) in 15-minule <br />intervals is: <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />DRAFT <br /> <br />7,91 <br />