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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 II <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />required and gives a' <br />reservoir on the local <br />acceptable to local <br />requirements. <br /> <br />general indication of the physical impact of <br />area. The off-channel sites have generally been <br />people in past studies because of smaller <br /> <br />the <br /> <br />more <br /> <br />ROW <br /> <br />In Table IV-I, the column for hydropower potential shows only a general <br />indication of suitability of the dam and reservoir for hydropower. <br />Hydropower production is essentially governed by the amount of water flowing <br />through the reservoir, and the available head. Mainstem reservoirs have the <br />most potential because they would have the most water available. The <br />hydropower potential for the mainstem reservoirs was an important factor in <br />site evaluation. <br /> <br />Intake facilities consist of the features required to convey water to <br />off-channel reservoirs, such as diversion dams and pipelines or canals. <br />There are no intake facilities associated with mainstem reservoirs. <br />However, mainstem dams require considerably larger spillways than do those <br />on smaller tributaries with small drainage areas. No pumping plants were <br />required for the intake facilities in any of the alternatives. <br /> <br />Figure IV-2 shows dam and reservoir costs plotted against total capacity for <br />each of the 10 sites. Total reservoir storage capacity is the sum of the <br />dead, inactive, active, and surcharge capacities. The dam and reservoir <br />cost includes the dam embankment, spillway, outlet works, ROW, and <br />relocations. It also includes the cost of intake facilities for off-channel <br />reservoirs. The curve for each dam and reservoir was developed from costs <br />associated with three or four different capacities at each site. The figure <br />is helpful in selecting the least costly alternatives, since the dam and <br />reservoir costs are the major factors in determining the total cost of each <br />alternative. Table IV-2 shows a tabulation of the preliminary cost <br />estimates for the alternatives. <br /> <br />The geology at each site is imperfectly known and was based partly on <br />information taken from various publications and used in conjunction with a <br />short reconnaissance examination. However, serious foundation problems are <br /> <br />IV-13 <br />