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<br />I. <br /> <br />. <br /> <br />5 <br /> <br />C. Alternative 3 - Dual Outlet Dam, 11,910 mWh Powerplant <br /> <br />This plan is also patterned after the original and includes the <br />hydropower facilities described in Alternative 2. The difference between <br />this plan and number 2 is that power would only be pr~duced in conjunction <br />with te~erature controlled releases for the downstream fishery. <br />Annual energy production with this plan is estimated at about 11,910 mWh, or <br />62 percent of Alternative 2. Project benefits with this alternative would <br />be reduced from $807,000 annually to $299,000 and some additional design <br />modifications would be required to overcome technical problems associated <br />with mixed releases. <br /> <br />D. Alternative 4 - Single Outlet Dam, No Power <br /> <br />Alternative 4 is the first of the single outlet alternatives where <br />all releases would be made through the low level outlet. This alternative <br />would not have a powerplant. <br /> <br />E. Alternative 5 - Single Outlet Dam, 19,240 mWh Powerplant <br /> <br />This single level outlet would incorporate hydroelectric facilities <br />similar to those described in Alternative 2, except that all releases would <br />be through the single outlet and therefore available for power production <br />within the capacity of the turbines. <br /> <br />This alternative, combined with the aeration option (Alternative <br />7) is the preferred plan. <br /> <br />F. Alternative 6 - Multi-level Outlet Dam, 19,200 mWh Powerplant <br /> <br />The alternative incorporating a multi-level intake system would <br />provide optimum temperature selectivity for downstream releases and access for <br />inspection and maintenance. The intake portals (at elevations 6815, 6775, and <br />6720) would be individually controlled by 5 x 6 foot pressure gates discharging <br />directly into a 78-inch diameter steel pipe. <br /> <br />Hydroelectric power facilities are the same as Alternative 2 but <br />due to increased head losses associated with a multi-level outlet, the energy <br />generated is estimated to be 95.5 percent of Alternative 2 and 95.7 percent of <br />Alternative 5. <br /> <br />G. Alternative 7 - Aeration of the Reservoir Bottom <br /> <br />Heavy metals are a potential water quality problem at the reservoir <br />and are discussed in detail under Water Quality in Chapter III. <br />