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The Joint-Use Reservoir, one of two concepts investigated in this Study, would be dedicated toward meeting such obligations. This new reservoir would be capable of providing about 30,000 af of water per year, about half of which would be used to increase the water yield of Dillon Reservoir and the remainder would be used for western Colorado. GREEN MOUNTAIN EXCHANGE: The concept of the Green Mountain Exchan~e Project recognizes Green Mountain Reservoir as a potential source of additional water supply to Dillon Reservoir. Water would be pumped from Green Mountain Reservoir through 26 miles of pipeline to Dillon Reservoir, which is about 1100 feet higher in elevation. In addition, a Replacement Reservoir(s) would be constructed to provide the replacement water for out-of-priority CBT Project diversions and to supplement natural flows thereby meeting in-basin irrigation and municipal demands. It (they) would also meet USBR water sales requirements that could otherwise have been supplied by the Green Mountain Reservoir storage made available for exchange. With the Replacement Reservoir(s) in operation, the water that would have been released from Green Mountain Reservoir could instead be pumped to Dillon Reservoir. This has been referred to as the "Green Mountain Pumpback" system. 1.2 PROJECT ORGANIZATION Study of the Joint-Use Reservoirs and Green Mountain Exchange Projects began in June 1985, when Boyle Engineering Corporation (Boyle) entered into contract with the Colorado Water Resources and Power Development Authority. The Authority was created by the General Assembly of the State of Colorado for the primary purpose of aiding in the planning, design, financing and construction of water and hydroelectric power projects. There are nine members of the Authority, eight of whom represent the major drainage basins in Colorado, and the ninth represents the City and County of Denver. The Exchange Team, a subcommittee of the Metropolitan Water Roundtable, has served as an Advisory Committee to the Authority during the formulation and execution of the Study. The Study has been conducted in three phases. The Phase 1 investigation was to collect and evaluate existing data on nine candidate reservoir sites and three alternative conveyance routes for initial screening purposes. The reservoir sites are displayed on Figure 1.1. Study phases and tasks are displayed in Figure 1.2. The results of the Phase I investigation are 1-3