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<br />4.0 DAM LAYOUTS AND COSTS <br /> <br />4.1 INTRODUCTION <br />The primary physical component of the Clear Creek Project would be a larg~ <br />dam and reservoir located in Clear Creek Canyon. A representative damsite was <br />selected for the purposes of this Step 2 study, and is located approximately <br />3.5 miles downstream of the confluence of Clear Creek and North Clear Creek. <br />This damsite is called Centennial. This chapter describes assumptions made in <br />planning this dam and gives estimated construction costs. <br /> <br />4,2 BACKGROUND <br />The Clear Creek Project Phase I, Step 1 - Feasibility Study (Step 1 Study) <br />previously identified 16 potential reservoir sites in the Clear Creek drainage <br />basin. These sites include 11 for water supply storage and 5 upper reservoirs <br />for pumped storage. The 11 sites for water supply storage include 4 canyon <br />damsites and 7 off-stream storage sites. Conceptual layouts were made for all <br />16 sites and cost estimates were prepared to determine the relative storage costs. <br />The results of those studies were given in the Final Report for the Step 1 Study <br />(Authority, 1987). <br /> <br />Based on the results of the Step 1 Studies, it was concluded that a reservoir <br />of at least 100,000 af capacity would be needed to produce a firm water supply <br />yield that is both sufficient in quantity as well as potentially cost effective <br />for the project sponsors. It was further concluded that a storage capacity of <br />~ 200,000 af or more may provide additional firm yield at an even lower unit cost <br />($/afjyr) due to economies of scale. The Centennial damsite was selected in these <br />Step 2 Studies as the representative canyon damsite. This site was used because <br />of its adequate reservoir storage capacity, favorable damsite topography, and <br />dams ite geology. <br /> <br />,.-. <br /> <br />4,3 PURPOSE <br />Dam layouts were prepared for three dam heights, capable of storing <br />110,000 af, 165,000 af, and 230,000 af, respectively. Cost estimates were <br />prepared for each of the three dam heights to determine the relationship between <br />total construction cost and reservoir volume. <br /> <br />4-1 <br />