Studies to establish biological design criteria for fish passage facilities: prototype testing of a cylindrical dewatering screen at McNary Dam, 2001-2002

Juvenile salmonid bypass facilities at hydroelectric dams on the Snake and Columbia Rivers are used to route fish past the dam through a non-turbine route and to collect juveniles for subsequent transportation and release below the dams. A major component of these systems is the primary dewatering screen, which removes excess water from the fish bypass channel and diverts juvenile migrants to holding and collection facilities. A combination of vertical and floor dewatering screens is used as the primary dewatering system at several dams on the Snake and Columbia Rivers. 2004 Contract no. W68SBV00358064 NMFS (National Marine Fisheries Service) NWFSC (Northwest Fisheries Science Center) Library Public Domain 2289