A Fish Bypass Screen at Puntledge Projectby Herbert Louie, Hydrotechnical Dep, Burnaby, Canada,
John Taylor, Hydrotechnical Dep, Burnaby, Canada,
Larry J. Swenson, Hydrotechnical Dep, Burnaby, Canada,
Abstract: An Eicher screen has been designed for the Puntledge Diversion Project on Vancouver Island in British Columbia, Canada. Its purpose is to reduce the mortality of downstream migrating juvenile salmonids caused by passing through the turbines. This mortality is estimated to be about 60%, with an estimated present value of $11 million over 30 years. The Eicher screen consists of a screen installed in a steel penstock at a shallow angle to the flow. This design is unique in that it uses much higher approach velocities at the screen than other conventional screens. Preliminary test results are very favourable, with greater than 99% successful passage of coho salmon smolts.
Subject Headings: Fish management | Rivers and streams | Streamflow | Turbines | Islands | Steel | Conduits | Basins | Fishways | North America | Canada | British Columbia | Vancouver
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