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<br />'Ol:" <br />U"J <br />c <br />- <br /> <br />c. <br /> <br />c, <br />~:. ,I <br />.~ <br /> <br />seasonal high aDd low inflow within the lake would result in a more <br />uniform quality and temperature of water in the Gunnison River below <br />the dam with the quality being improved considerably during the late <br />sUDDDer. fall, and winter months when the natural river flows are <br />lowest and the saline concentrations greatest. The quality, tempera- <br />ture, and sediment control provided by the lake would also enhance <br />the appearance and the fishery and recreational values of the down- <br />stream reach of the Gunniaon River. <br /> <br />The extension plan would offer potentialities for hydro-electric <br />power development that are not evaluated in the present report. <br />A small powerplant located at the toe of Dominguez Dam could utilize <br />releases from the lake for power generation. A large pumped storage <br />power development up to several mil110n kilowatts in capacity could <br />be built in conjunction with the exteuion plan. This would require <br />conatruction of Gibbler Reservoir in a natural basin above and west <br />of the Dominguez lake site. tunnels between Dominguez Lake aDd <br />Gibbler Reservoir, and pumping-generating units at the lower end <br />of the tunnels. <br /> <br />;',1 <br /> <br />Construction costs are estimated at $43,000,000 for the improvement <br />plan and $45,200,000 for the extension plan without consideration <br />of the potential hydro power developlll81lt. A benefit-cost analysis <br />has not been prepared for the improvement plan because of the lack <br />of accurate data to monetartly evaluate the benefits of salinity <br />control which would be one of the major objectives of the improvement <br />plan. Present estimates iDdicate that benefits of the extension <br />plan would exceed costs in a ratio of 1.9 to 1.0. <br /> <br />Current findings indicate that feasibility studies of both the <br />improvement and extension plans are warranted. Local interests <br />have shown strong support for both plana. The potential hydro power <br />development appears sufficiently attractive to justify detailed <br />studies. It is recommended that authorization be sought for feasi- <br />bility studies of the improvement and extension plans including <br />the hydro power potentiality. <br /> <br />'~~;r.,,- <br /> <br />J. W. Robins <br />Project Manager <br />