Development of an Eicher Screen at the Elwha Dam Hydroelectric Project

by Pieter Adam, Harza Northwest Inc, Bellevue, United States,
Donald P. Jarrett, Harza Northwest Inc, Bellevue, United States,
Allan C. Solonsky, Harza Northwest Inc, Bellevue, United States,
Larry Swenson, Harza Northwest Inc, Bellevue, United States,

Document Type: Proceeding Paper

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


The Eicher Screen is a relatively new concept for screening juvenile fish out of hydroelectric turbine penstocks. The concept was developed by Mr. George Eicher and one was recently installed and evaluated at the Elwha Hydroelectric Project in Washington State. The Eicher Screen was installed inside a 9-foot diameter penstock in March 1990. The screen assembly consists of wedgewire panels of varying porosities mounted on a support frame. A pivot shaft inside the penstock allows the screen to be rotated and backflushed for cleaning. Hydraulic analyses, operational testing and initial biological evaluation were conducted from April through June 1990. Maximum headloss measured through the screen never exceeded two feet (0.61 m) and debris has not created any problems at the site to date. Biological evaluations consisted of passing 5,000 coho salmon smolts through the screened penstock. Over 99 percent of the fish were recovered from the penstock and survived a three day holding period. Additional biological evaluations will be performed in 1991.

Subject Headings: Biological processes | Dams | Hydro power | Power plants | Porosity | Frames | Shafts | Conduits | Washington | United States

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