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<br />b. Toll Gate Creek dam and reservoir. Several reservoir <br />sites along Toll Gate Creek and its tributaries, East and West <br />Toll Gate Creeks, were investigated during the preliminary <br />screening process. One site, located at the confluence of <br />East and West Toll Gate Creeks, would control about 32 square <br />miles of the basin's drainage area. Alternative sites located <br />on East Toll Gate Creek, about 1 mile upstresm from Toll Gate <br />Creek, and one located on West Toll Gate Creek, about 2 miles <br />upstream from Toll Gate Creek, were also investigated. The <br />latter sites would control about 28 square miles of the basin's <br />drainage area. The East Toll Gate Creek si te would require the <br />relocation of Buckley Field facilities totalling nearly $1 million <br />in value. Smaller sites are located farther upstream, but the <br />degree of control would be reduced and the number of sites <br />required would increase to four. Preliminary estimates indi- <br />cated that costs of providing the single dam at the confluence <br />of East and West Toll Gate Creeks or the two alternative sites <br />upstream would be comparable. Since the site at the confluence <br />of East and West Toll Gate Creeks would control a greater por- <br />tion of the basin's drainage area, it was selected for detailed <br />study. <br /> <br />21. URBAN PROTECTION CRITERIA <br /> <br />For flood plain areas that 8.l'e currently or are likely to <br />be developed. studies were made to determine adequate protection <br />against a standard project flood. Where physical or economic <br />constraints were encountered, the highest degree of economically <br />feasible flood protection was considered. <br /> <br />28. PROJECT FORMULATION <br /> <br />cP <br />~ <br />~ <br /> <br />a. General. The plan of improvement for the Sand Creek <br />basin which was selected for further study consists of three <br />basic elements. These elements are the Sand Creek dsm and <br />reservoir, the Toll Gate Creek dam and reservoir, and the chan- <br />nel improvement works on Sand and Toll Gate Creeks downstresm <br />from the potential dsmsites. Because of the location of these <br />projects with respect to the area to be protected, and because <br />of their hydrological interrelationships, the three project <br />elements were considered as a system. Studies were made of <br />each element of the system to determine the level, within <br />physical and institutional constraints, at which the net bene- <br />fits would be MllJtimum. <br /> <br />b. Sand Creek dsm and reservoir. For the Sand Creek <br />reservoir, an allowance of 5.000 acre-feet was made for the <br />100-year sediment accumulation. Formulation of the recreation <br /> <br />52 <br />