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<br />1 <br /> <br />1:) <br />o <br />" <br />'l~ <br />~ <br />1 <br /> <br />'1 <br /> <br />l <br /> <br />:] <br /> <br />] <br /> <br />'j <br /> <br />I <br /> <br />; <br />j <br /> <br />i <br />" <br /> <br />" <br /> <br />,] <br /> <br />The Joint-Use Reservoir, one of two concepts investigated in this Study, would be <br /> <br /> <br />dedicated toward meeting such obligations. This new reservoir would be capable of prov,\ding <br /> <br /> <br />about 30,000 af of water per year, about half of which would be used to increase the wate~,.yield <br /> <br />of Dillon Reservoir and the remainder would be used for western Colorado. <br /> <br />GREEN MOUNTAIN EXCHANGE: The concept of the Green Mountain Exchange Project <br /> <br />recognizes Gre.en Mountain Reservoir as a potential source of additional water supply to Dillon <br /> <br />Reservoir. Water would be pumped from Green Mountain Reservoir through 26 miles of pipeline <br /> <br />to Dillon Reservoir, which is about 1100 feet higher in elevation. In addition, a Replacement <br /> <br />Reservoir(s) would be constructed to provide the replacement water for out-of-priority CST <br /> <br />Project diversions and to supplement natural flows thereby meeting in-basin irrigation and <br /> <br />municipal demands. It (they) would also meet USBR water sales requirements that could <br /> <br /> <br />otherwise have been supplied by the Green Mountain Reservoir storage made avaiiable for <br /> <br /> <br />exchange. With the Replacement Reservoir(s) in operation, the water that would have been <br /> <br />released from Green Mountain Reservoir could instead be pumped to Dillon Reservoir. This has <br /> <br />been referred to as the "Green Mountain Pumpback" system. <br /> <br />1.2 <br /> <br />PROJECT ORGANIZATION <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 Water <br /> <br /> <br />Resources and Power Development Authority. The Authority was created by the General <br /> <br />Assembly of the State of Colorado. for the primary purpose .of aiding in the planning, design, <br /> <br /> <br />financing and construction of water and hydroelectric power projects. There are nine members <br /> <br />of the Authority, eight of whom represent the major drainage basins in Colorado, and the ninth <br /> <br /> <br />represents the City and County of Denver. The Exchange Team, a subcommittee of the <br /> <br /> <br />Metropolitan Water Roundtable, has served as an Advisory Committee to the Authority during the <br /> <br />formulation ahd execution of the Study. <br /> <br />The Study has been conducted in three phases. The Phase 1 investigation was to collect <br /> <br />and evaluate existing data on nine candidate reservoir sites and three alternative conveyance <br /> <br />routes for Initial screening purposes. The reservoir sites are displayed on Figure 1.1. Study <br /> <br /> <br />ph,ases and tasks are displayed In Figure 1.2. The results of the Phase I investigation are <br /> <br />1-3 <br />