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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 /> <br />TECHNICAL MEMORANDUM <br /> <br />TO: Mr. Nick Ioannides, P.E.; Colorado Water Conservation Board <br /> <br />FROM: Wright Water Engineers, Inc. <br /> <br />DATE: April 30, 1986 <br /> <br />SUBJECT: River Hydrology, Brown Ditch Weirs <br /> <br />Drainage Basin <br />The South platte River drainage basin at Littleton includes approximately <br />4,850 square miles extending from the Continental Divide in the Rocky <br />Mountain Range to the high plains and foothills of eastern Colorado as <br />shown on Figure 1. The characteristics and hydrologic impact of the <br />mountainous region and the high plains and foothills region are quite <br />different. The mountainous western portions of the basin produce heavy <br />snowmelt runoff during late spring. On the other hand, the high plains and <br />foothills portions of the basin are more susceptible to high runoff during <br />summer thunderstorms. <br /> <br />The metropolitan Denver area is heavily developed and outlying areas are <br />sparsely developed. The mountainous areas are generally unsuited for dense <br />development and will probably remain sparsely developed. The foothill and <br />high plains areas are more likely to develop but not to the extent of the <br />existing metropolitan area. Existing development in the metropolitan area <br />consists primarily of residential and commercial areas with minimal indus- <br />trial regions. <br /> <br />The river flow hydrology at the Columbine Valley river reach is strongly <br />controlled by Chatfield Reservoir. For that reason this analysis is pri- <br /> <br /> <br /> <br />d <br />2 <br /> <br />. <br />~ <br />W <br />w <br />2 <br />ffi <br />z <br />w <br />m <br />~ <br />~ <br />~ <br />I <br />~ <br />m <br />~ <br />