A Critical Review of Fish Exclusion Systems for Turbine Intakes with Particular Reference to a Site on the Connecticut River, U.S.A.


C P. Ruggles




Atlantic salmon, canal, clupeids, Connecticut River, downstream fish passage, fish diversion, fish exclusions, fish passage, fish protection, floating louvers, herring, hydroelectric, intake, juvenile, louvers, prototype, radio tags, salmon, salmonids, screens, shad, smolt, turbines, water depth


A critical review of fish passage facilities suitable for excluding anadromous salmonids and clupeids from hydroelectric turbine intakes identified four potential methods. A floating louver array in conjunction with surface spill from an ice and trash sluiceway located near the turbine intakes was considered to have the best chance of diverting 75% or more of the juvenile migrants from the turbine intakes. A prototype floating louver device was designed, built, and tested at a 5.5. m deep canal with a flow of approximately 150 m3/s. The device was based on the observation that downstream fish migrants are found near the water surface. Hence, only the top 2.4 m of water depth was screened. The louver array was 176 m long and guided between 80 to 100% of radio tagged Atlantic salmon smolts. Further testing of the device with anadromous clupeids is scheduled for the fall of 1990.

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