Fishways--Historical Assessment of Design Practiceby John F. Orsborn, Washington State Univ, Albrook, Hydraulics Lab, Pullman, WA, USA,
Thomas W. Bumstead, Washington State Univ, Albrook, Hydraulics Lab, Pullman, WA, USA,
Robert G. Aasreude, Washington State Univ, Albrook, Hydraulics Lab, Pullman, WA, USA,
Patrick D. Powers, Washington State Univ, Albrook, Hydraulics Lab, Pullman, WA, USA,
Abstract: Fishway design has evolved over the years in a conservative fashion. Research has led to the development of some innovative structures, but costs and water usage have been high. Conservative design stems from three sources: (1) a lack of hard data on fish swimming capabilities; (2) a lack of integration of fluid mechanics with fish capabilities; and (3) design modifications based on fish responses rather than on stimuli. A two-year study on the state-of-the-art and new innovations in fishway design is just being completed. The study includes the historical tracing of fishway designs, a survey of current design practices and the development of new, more efficient fishway designs. The efficiencies are derived from faster fish passage, less water, and less costly construction. A summary of some historical aspects of the project, and promising new aspects of fishway design are presented.
Subject Headings: Hydraulic design | Fishways | Fish management | Innovation | Water use | Water conservation | Data processing | Fluid mechanics
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