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<br />] <br /> <br />1 <br /> <br />l <br /> <br />"j <br /> <br />-1 <br /> <br />J <br /> <br />J <br /> <br />:-J <br /> <br />.l <br /> <br />j <br />) <br />I <br /> <br />I <br /> <br />1 <br />.1 <br /> <br />a <br />o <br />(--\ <br />C) <br />1\) <br />00 <br /> <br />EXECUTIVE SUMMARY <br /> <br />The evaluation of the Joint-Use Reservoir and Green Mountain Exchange Projects (Study) <br /> <br />was Initiated by the Colorado Water Resources and Power Development Authority (Authority) at the <br /> <br />request of the Colorado River Water Conservation District (CRWCD) and tlie Board of Water <br /> <br /> <br />Commissioners for the City and County of Denver (DWB). The projects designated for investigation <br /> <br />evolved from two concepts advanced to resolve the problems associated with Increasing water <br /> <br />demands in the Denver Metropolitan area and the concern over water supplies on the western slope <br /> <br /> <br />of Colorado. The concepts are: <br /> <br />o <br /> <br />Joint-Use Reservoir: A reservoir which would be capable of providing about <br /> <br /> <br />30,000 acre-feet (af) of water per year for east slope and west slope use, and <br /> <br />o <br /> <br />Green Mountain Exchange: A water exchange project that would utilize Green <br /> <br /> <br />Mountain Reservoir, a Replacement Reservoir, and a pump and pipeline <br /> <br /> <br />system to increase the water supply to Roberts Tunnel. <br /> <br />Both concepts would require new reservoirs to regulate flows in the Upper Colorado River <br /> <br />Basin. The Joint-Use Reservoir Project would retain snow-melt runoff to provide additional water for <br /> <br />use in western Colorado and would partially relieve Dillon Reservoir of its obligation to release water <br /> <br /> <br />to meet downstream water demands. The Green Mountain Exchange Project would replace the <br /> <br /> <br />required releases from Green Mountain Reservoir with releases from a new Replacement <br /> <br /> <br />Reservoir(s) and permit water stored in Green Mountain Reservoir to be pumped upstream to Dilion <br /> <br />Reservoir. The increase in water in Dillon Reservoir due to either project could be diverted to the <br /> <br /> <br />Denver Metropolitan area through the Roberts Tunnel. <br /> <br />PROJECT STUDY <br /> <br />Study of the Joint-Use Reservoirs and Green Mountain Exchange Projects began in June <br /> <br />1985, when Boyle Engineering Corporation (Boyle) entered into contract with the Colorado \Vater <br /> <br />Resources and Power Development Authority. The purpose of this technical Study has been to <br /> <br />1 <br />