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O~~e}. and Storage Needs Assessment SECWCD/Assessment Enterprise December 10, 1998 Arkansas River to Pueblo Reservoir during the preceding months of October, November, December, January, February, March, and April. 2. All west slope water available is diverted to the Project to the east slope, subject to the Operating Principles, limits of reservoir storage capacity, contractual arrangements, and demand for direct delivery of Project water. 3. As much of the newly diverted west slope Project water as possible is stored in the upper reservoirs, subject to the limits of reservoir storage capacity and contractual arrangements. 4. Newly diverted west slope Project water, which cannot be stored in the upper reservoirs, is conveyed down the Arkansas River to Pueblo Reservoir, subject to the limits ofreservoir storage capacity and contractual arrangements. 5. Project water is released from the upper reservoirs to meet the demands of Project water users who are located in the District upstream of Pueblo Reservoir. These releases may occur in any month throughout the year. 6. Project water is released from Pueblo Reservoir to the Arkansas River, the Fountain Valley Conduit, and the Bessemer Ditch to meet the demands of Project water users that may be served from Pueblo Reservoir. Releases to the Arkansas River and Fountain Valley Conduit may occur in any month throughout the year. Releases to the Bessemer Ditch are during the irrigation season. The conveyance of water from the upper reservoirs to Pueblo Reservoir is managed to try to meet a variety of in stream flow objectives within the overall legal constraints of water law and contractual requirements and in accordance with the voluntary annual flow agreement between the Bureau of Reclamation and Colorado Department of Natural Resources. These objectives include: . Maintaining a minimum year-round flow of250 cfs (at the Wellsville Gage) to protect the fishery. . Maintaining optimum flows for fish spawning during specific periods of the year. This set of flows is relatively complex, involving target flows during fish spawning, incubation, and hatching periods. rn GEl Consultants, Inc. 2-4 Q7411\FiniU\TEXT-A.WPD I I I I , II I I I " I I, I, I I I I I I \1