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<br />-----.-----f.xumptlJ-ut--'-'-tdE"mcrH11g Block" 'S1"or''Tl Arrangement <br />l.ocotiol1 Northwest of Denver <br />'T <br />, r <br />~ 7 ' <br />r <br /> <br />~, <br /> <br />~ <br />~ <br />~ <br /> <br />. <br />. <br />-0' <br />E <br />c <br />- . <br />. <br />~ <br />"ViJ <br />. <br />E <br /> <br />"__",,'0," ~ ~,~.~J rn I"",,""e,',",_~,.~ <br />10 JO 50 70 90 110 '?O :50 '70 190 210 DO 250 27C 290 3'0 JJ{1 ~5-0 <br />Tir1e ill Millu1es <br /> <br />o <br />C <br />o' <br />~ <br /> <br />FigUrEJ 7.1 <br /> <br />------ <br /> <br />- <br /> <br />__111:-- <br /> <br />3.7.2 Colorado Urban Hydro')raph Procedure (CUHP). An altel'l1ativH method <br />commonly used along the Front Range to temporally distribute rainfall amounts is to place <br />the larger incremenial amounts more heavily towards the front of the desi!Jn storm. This <br />method is based 011 the observation that very intense rainfall in the area results from <br />convective storms or frontal stimulated convective storms. These types of storms are otten <br />less than one or two hours in duration and can produce brief periods of 11igh rainfali <br />intensities. For more detailed informaton on this arrangement see Urban Storm Drainage <br />Criteria Manual by the Urban Dra.ina!le and Flood Control district. <br /> <br />3.7.3 Soil Conservation Service (SCS) Method. The U.S. Department of <br />Agriculture, SCS, has developed 24-hour syntlletic storm hyetographs for United States. <br />The Type IIA rainfall distribution is recommended for use in Colorado. This clistribution in <br />terms of the ratio P IP24 (precipitation at time t over 24-rlour precipitation) in 15-minute <br />intervals is: <br /> <br />Colorado Flood <br />Hydrology Manual 7.9 <br /> <br />DRAFT <br />