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GREEN RIVER STUDY PLAN 23 February 2, 2007 Table 2. Continued. Primary Studies Topic Not Addressed by Anticipated Effects and Uncertainties (Hypotheses) That Address Studies (information Hypothesis needs) Backwaters in Reach 2 U18. The effect of base flow variability (within-day, within- . Project 138 . Effect of base flow season, within-year, between years) on backwater habitat quality . Project 22f variability on (e.g., temperature, productivity) (U.S. Department of the Interior . Western backwater backwater habitat and Western Area Power Administration 2005). topography quality. . Project 128 . Project 144 . Project 85f A8. Base flows in summer and autumn scaled to the hydrologic . Project 138 . Relationship condition favor the formation of backwaters and other low- . Project 22f between peak flow, velocity shoreline nursery habitats (Muth et al. 2000). . Western backwater sediment and habitat topography development. . Project 128 . Project 144 . Project 85f U 17. The effect of peak flows, sediment availability, and . Western backwater . Relationship antecedent conditions on the relationship between base flow topography between peak flow, level and backwater habitat availability (Muth et al. 2000). . Project 85f sediment and habitat development. A9. Maintenance of the mean base flow within recommended . Project 138 . Habitat conditions at levels of seasonal and within-day flow variability throughout . Project 22f beginning ()f summer, autumn, and winter will promote favorable conditions . Western backwater baseflow period. for all life stages of endangered fishes that use low-velocity topography habitats (Muth et al. 2000). . Project 128 . Project 133 . Project 144 . Stocked fish evaluation Backwaters in Reach 3 U24. The effect of base flow variability (within-season, within- . Project 138 . Backwater habitat year, between years) on backwater habitat quality (e.g., . Project 128 availability and temperature, productivity) (U.S. Department of the Interior and characteristics in Western Area Power Administration 2005). Reach 3. Nonnative Fishes in Reach 1 Ul. The increased frequency of bypassing water (spills) would . Project 115 . Spillway result in increased entrainment of reservoir nonnative species. . UDWR trout entrainment rates. Reach 1 monitoring should include specific efforts to evaluate . Project C18/19 the potential for establishing undesirable reservoir fishes, such as smallmouth bass in the tailwater (U.S. Fish and Wildlife Service 2005).