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<br />and has not exhibited movement in the last 24 million years (Kirkham and Rogers, <br />1981). The potential exists for the migration of some reservoir waters <br />southeastward along the fault for approximately 1.5 miles into Beaver Brook. <br />However, faults of the age of the Black Hawk Fault, at least 70 million years, <br />can be silicified and relatively tight; consequently, significant seepage losses <br />along the fault are not anticipated. <br /> <br />4,6 COST ESTIMATES <br />Construct ion cost estimates were prepared for three dam heights. These <br />costs, summarized in Table 4.1, were used to determine the relationship between <br />the dam height and construction cost. <br /> <br />, , <br /> <br />Figure 4.2 shows this relationship for a range of dam heights from 420 to <br />540 ft. Construction costs include a 25 percent contingency and a 15 percent <br />allowance for engineering and administration. The estimated cost for interest <br />during construction and project financing are included later in this report as <br />part of the financial analysis of the project. Figure 4.3 shows the relationship <br />between the total construction cost of the dam versus reservoir capacities of <br />110,000 af to 230,000 af. Construction costs range from $142 million for the <br />110,000 af reservoir to $211 million for the 230,000 af reservoir. <br />TABLE 4.1 <br /> <br /> Centennial Dam - Cost Summary <br />Reservoir Dam Dam <br />Vol ume(l) Hei ght(2) Vol ume(3) <br />(acre-feet) (feet) ( vd3) <br />,...... <br />110,000 420 650,000 <br />165,000 480 950,000 <br />230,000 540 1,200,000 <br /> <br />Construction <br />Cost of Dam(4) <br />($ mi 11 ion) <br /> <br />142 <br />166 <br />211 <br /> <br />,-... <br /> <br />(l)Total reservoir volume including permanent recreation pool of 30,000 af. <br />(2)Oam height above streambed. <br />(3)Oam volume for a concrete-arch dam. <br />(4)Construction cost includes a 25 percent contingency and 15 percent for <br />engineering and administrative costs. <br /> <br />4-3 <br /> <br />,-... <br />