Evaluation of an Eicher Fish Diversion Screen at Elwha Dam

by Fred C. Winchell, Stone & Webster Environmental, Services, Boston, United States,
Charles W. Sullivan, Stone & Webster Environmental, Services, Boston, United States,



Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources

Abstract: In the spring of 1990, the Electric Power Research Institute (EPRI) initiated testing of an inclined fish screen installed in a 9-foot diameter penstock at the Elwha Hydroelectric Project in Washington State. In tests performed with coho salmon smolts, over 99 percent of the fish were diverted without mortality. At penstock velocities from 4 to 6 fps, less than 0.1 percent of the fish had scale loss exceeding 16 percent on either side (considered 'descaled' in criteria used on the Columbia River), and less than 5 percent showed any type of injury. Slightly more descaling was observed at higher penstock velocities. At the maximum velocity tested (7.8 fps), 3.6 percent of the fish had scale loss of over 16 percent, and 18.1 percent of the fish had scale loss between 3 percent and 16 percent. Mortality after a 3 to 10-day holding period averaged 0.21 percent for test fish and 0.14 percent for controls.

Subject Headings: Fish management | Hydro power | Conduits | Electric power | Rivers and streams | Fluid velocity | Accidents | Dams

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