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<br />corollary improvement of flood channels, establishment of <br />floodvays, provision of recreation facilities, and treatment <br />of the basin's waste vater effluent. Localized projects for <br />eliminating threats to bridges, bridge approaches, and public <br />vorks can best be developed on an individual basis under <br />existing authorities. <br /> <br />25. SITE SELECTION CRITERIA <br /> <br />The folloving criteria governed the selection of sites for <br />flood control impoundments: <br /> <br />a. The location should control a significant proportion of <br />the drainage area to ~aterially reduce the threat of high residual <br />flood runoff; <br /> <br />b. The site capacity must be adequate to permit develop- <br />ment of the high degree of flood control essential for protection <br />of urban areas; <br /> <br />c. The site must be suitable from an engineering standpoint <br />for construction of embankment and outlet facilities without <br />excessive cost; <br /> <br />d. The degree of flood control provided must yield suffi- <br />cient econo~ic benefits to justify investment costs; and <br /> <br />e. Insofar as is practicable, the site should be adjustable <br />to the developllent of allied project purpolles 'to meet existing <br />and anticipated requirements. <br /> <br />26. SITE SELECTION <br /> <br />a. Sand Creel< dam and reservoir. Severe.l potential upstream <br />reservoir sites along Sand Creek and its tributaries, Coal and <br />Murphy Creel<s, were investigated during the preliminary screening <br />process. Sites along Sand Creek and Murphy Creek contain high- <br />vays and pover lines and the costs of relocating these facilities <br />vould be prohibitive. A reservoir site, located on Coal Creek <br />about 3 miles upstream from the confluence of Coal and Murphy <br />Creeks, contained little development and offered sufficient <br />topographic relief to develop a high degree of control of poten- <br />tial flood runoff. This site, vhich is referred to as the Sand <br />Creek dam and reservoir site in this report, vas selected for <br />detailed study. <br /> <br />~ <br />~ <br />-1 <br /> <br />51 <br />