Protection of Juvenile Anadromous Fishby Thomas R. Haider, US Bureau of Reclamation, Denver, CO, USA,
Philip H. Nelson, US Bureau of Reclamation, Denver, CO, USA,
Abstract: Protection of juvenile anadromous fish (salmon, steelhead, etc. ) during their seaward migration is a major concern in the Pacific Northwest. The existing screening structures at the head end of power and irrigation canals have been only moderately successful; therefore, the Bureau of Reclamation in conjunction with various local and national fishery agencies has developed an improved screening structure to divert the juveniles back to the river. The improved design positions the screens at a skew angle to the canal centerline to assure an adequate sweeping velocity to move the juvenile fish to bypass bays before they become exhausted and impinge on the screens, provides adequate screen area for proper approach velocity, and provides increased bypass capacity to attract the fish to the bypass bays. Close attention was also given to other factors, such as alignment of the canal upstream of the screens and certain geometric relationships, which are critical to the proper operation of the screens.
Subject Headings: Fish management | Canals | Bays | Hydraulic design | Irrigation | Steel | Existing buildings | Head (fluid mechanics) | Pacific Northwest | North America | United States
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