Hydraulics of Resting Pools for Denil Fishways
Publication: Journal of Hydraulic Engineering
Volume 123, Issue 7
Abstract
This paper presents the results of an exploratory laboratory study on the hydraulics of fish resting pools that are built between two Denil fishways, making a full turn or arranged in a folded-back pattern. These experiments show that the flow from the Denil entering the pool diffuses as a surface jet, with an increased growth rate, possibly because of the circulation and turbulence in the pool. This diffusing jet impinges on the backwall and dives into the pool. The flow formation in the vicinity of the outflowing Denil appears to occur in a relatively small region. The energy dissipation in the pool is significant. To provide some resting areas for fish ascending the multiple Denils, it is necessary to provide some depth below the common invert of the two Denils. Some suggestions have been made for determining the size of these resting pools.
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References
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Clay, C. H. (1995). Design of fishways and other fish facilities, 2nd Ed., Lewis Publishers, Ann Arbor, Mich.
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Decker, L. F. (1967). Fishways in Maine. Maine Department of Inland Fisheries and Game, Augusta, Maine.
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Katopodis, C. (1981). “Considerations in the design of fishways for freshwater species.”Proc., 5th Can. Hydrotech. Conf., Canadian Society of Civil Engineers, 857–878.
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Katopodis, C., and Rajaratnam, N. (1983). “A review and laboratory study of the hydraulics of Denil fishways.”Can. Tech. Rep. of Fishery and Aquatic Sci. 1145, Fisheries and Oceans, Winnipeg, Canada.
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Rajaratnam, N., and Katopodis, C.(1984). “Hydraulics of Denil fishways.”J. Hydr. Engrg., ASCE, 110(9), 1219–1233.
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Published In
Journal of Hydraulic Engineering
Volume 123 • Issue 7 • July 1997
Pages: 632 - 638
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Jul 1, 1997
Published in print: Jul 1997
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