Development of a surface collection system for juvenile salmonids at the Cowlitz Falls Hydroelectric Project
- Harza Northwest, Bellevue, WA (United States); and others
In 1991, the Bonneville Power Administration (BPA) entered into agreements to purchase power and install fish passage facilities at the Cowlitz Falls Hydroelectric Project. The Project, completed in May 1994, is located upstream of two existing projects. Fish passage facilities will assist in efforts to restore anadromous fish runs into the uppermost section of the river. BPA`s restoration program includes transportation of adult anadromous fish around all three dams for release upstream to spawn. Facilities at Cowlitz Falls with collect juvenile downstream migrants for transport to the lower river. Prototype facilities, which include four flow restricting baffles with vertical openings 4 ft. wide by 36 ft. high, were evaluated in June 1994. The baffles are situated in front of two center spillways and above two turbine intakes. Design of the baffled spillways was based upon a review of available fish passage information and a 1:42.5 scale hydraulic model. During the spring evaluation, salmon and steelhead smolts were released upstream of the dam to evaluate the vertical baffled slot`s ability to attract juvenile migrating salmonids away from the deeper turbine intakes. A velocity of 2.2 fps was created through each slot by releasing water through a radial gate downstream of the baffles. Final Project configuration will include a pump-back or flow induction system to eliminate the need for spill. Results from the 1994 study indicate that the vertical baffled slots are very effective in attracting downstream migrants. Additional studies in 1995 and 1996 will evaluate the effectiveness of fish guidance past a prototype ramp fish screen and through a top spilling flap gate built into the existing radial gate. A 1:12 scale hydraulic model is currently being studied to optimize the design of the ramp fish screen.
- OSTI ID:
- 219924
- Report Number(s):
- CONF-9507190-; TRN: 96:000708-0006
- Resource Relation:
- Conference: Waterpower 1995: international conference, San Francisco, CA (United States), 25-28 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Waterpower`95. Volume 1-3; Cassidy, J.L. [ed.]; PB: 2869 p.
- Country of Publication:
- United States
- Language:
- English
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