Discharge Rating Equation and Hydraulic Characteristics of Standard Denil Fishways
Publication: Journal of Hydraulic Engineering
Volume 129, Issue 5
Abstract
This paper introduces a new equation to predict discharge capacity in the commonly used Denil fishway using water surface elevation in the upstream reservoir and fishway width and slope as the independent variables. A dimensionless discharge coefficient based only on the physical slope of the fishway is introduced. The discharge equation is based on flow physics, dimensional analysis, and experiments with three full-scale fishways of different sizes. Hydraulic characteristics of flow inside these fishways are discussed. Water velocities decreased by more than 50% and remained relatively unchanged in the fully developed flow downstream of the vena contracta region, near the upstream baffle where fish exit the fishway. Engineers and biologists need to be aware of this fact and ensure that fish can negotiate the vena contracta velocities rather than velocities within the developed flow region only. Discharge capacity was directly proportional to the fishway width and slope. The new equation is a design tool for engineers and field biologists, especially when designing a fishway based on flow availability in conjunction with the swimming capabilities of target fish species.
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Information
Published In
Journal of Hydraulic Engineering
Volume 129 • Issue 5 • May 2003
Pages: 341 - 348
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Sep 28, 2001
Accepted: Nov 6, 2002
Published online: Apr 15, 2003
Published in print: May 2003
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