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Descaling and orifice passage efficiency studies at McNary Dam, 1995
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1997
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Description:Extended-length submersible bar screens (ESBSs) have been tested at McNary Dam since 1991 as alternatives to standard-length submersible traveling screens (STSs) for guiding downstream migrating juvenile salmonids out of turbine intakes. During the 1995 spring and summer outmigration periods, the National Marine Fisheries Service conducted studies to evaluate the gatewell orifice passage efficiency (OPE) for chinook salmon and steelhead using an ESBS with a newly designed vertical barrier screen and an inlet flow vane. An auxiliary study compared juvenile fish descaling associated with two beam extension modifications in gatewells equipped with these new guidance devices.
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Rights Information:CC0 Public Domain
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Compliance:Library
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