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f 4. Rising reservoir levels in sprinq, declininq in the fall Changes in reservoir levels are thought to impact fishery characteristics such as spawning and recruitment of both native and sport fish. This may be related to nutrient, temperature, and inundation depth of riparian areas. Reauired Model Outputs Monthly reservoir levels Monthly river and reservoir temperatures, water quality parameters 5. Minimizing water supply shortaqes, meetinqlmaximizing water supply contracts The primary purpose of the existing reservoir system is to provide water for maintenance of the human environment. -Impacts to both irrigation and urban uses can be large, economically and socially. Shortages to water supply contracts should be minimized, particularly for M&I uses. Flexibility in meetinq consumptive use demands should be enhanced through banking, transfers, exchanges, and coordination with other water supplies. Reauired Model Outputs Deliveries to users Reservoir elevations, releases, inflows to Powell and tributaries Expected depletion schedules Duration of shortages Economic value of various uses Alternate sources of supply (banking, other river basins, agricultural conversion, groundwater, conservation) 6. Maximize hydropower production and value Since hydropower production is one of the few renewable, non- polluting energy resources, it should be put to the qreatest use. Aspects of this topic include protecting load following (peaking), generating capacity, and minimum power head while minimizing powerplant bypasses. Reauired Model Outputs Alternate sources of power Reservoir releases, elevations, inflows, deliveries Hydropower demands Duration of shortages Generation efficiencies (esp. minimum power head)