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Evaluation of intake modifications at Bonneville Dam second powerhouse, 2001
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2002
[PDF-12.03 MB]
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Description:In 1999, National Marine Fisheries Service studies of existing fish-guidance, biological, and hydraulic-model data concluded that flow conditions at Bonneville Dam Second Powerhouse were not conducive to high fish guidance efficiency (FGE) because ofinadequate flow entering the gatewell above the submersible traveling screen (STS). From these studies, the following three modifications were proposed to increase flow from the turbine intakes into the gatewell: 1) Remove a section of concrete beam to extend the vertical barrier screen (VBS); 2) Attach a turning vane to the STS; and 3) Install a gap closure device on the ceiling intake just downstream from the top edge ofthe STS.
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Rights Information:CC0 Public Domain
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