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Studies to evaluate the effectiveness of extended-length screens at Little Goose Dam, 1995
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1996
[PDF-5.46 MB]
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Description:Descaling estimates were obtained for yearling chinook salmon and steelhead collected from slots in Turbine Units 4 and 5 at Little Goose Dam. Turbine Unit 4 (test unit) was equipped with prototype extended-length bar screens, inlet flow vanes, and two types of vertical barrier screens (VBS I and II); Turbine Unit 5 (control unit) was equipped with standard-length submersible traveling screens and modified balanced-flow vertical barrier screens. We also evaluated orifice passage efficiency for yearling chinook salmon in Slots A and B of Turbine Unit 4. In summary, we determined: 1) With the inlet flow vane in place, there was no significant difference in descaling for yearling chinook salmon or steelhead between VBS I and II or between either of these VBSs and the control slot. 2) Descaling of yearling chinook salmon was significantly lower with the inlet flow vane than without it (1.9 VS. 5.5%), but steelhead descaling was not significantly different (1.7 VS. 1.3%). 3) Orifice passage efficiency for yearling chinook salmon averaged over 90% in the two slots tested (20-hour tests)
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Rights Information:CC0 Public Domain
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