Upper Midwest Environmental Sciences Center
Search fish passage bibliography
Katopodis, C. and N. Rajaratnam (1983). A review and laboratory study of the hydraulics of Denil fishways. Canadian Technical Report of Fisheries and Aquatic Sciences. 1145:1-181.
The development of Denil fishways is reviewed and the hydraulics of three Denil designs, referred to as Denil 1, 2 and 3, are studied experimentally and analytically. The very turbulent nature of the flow in the fishways is described and extensive velocity measurements are presented. Velocity profiles in the centerline of Denil 1 and 2 are distinct and display characteristic shapes amenable to similarity analysis, while velocity profiles for Denil 3 are inconclusive in this respect. Depth averaged velocities through the fishways are found to be only 11% to 14% of the average velocities expected in rectangular channels of the same dimensions. Energy dissipation in the three fishways is high. For slopes of 20% or more the fishways are more efficient than a hydraulic jump in dissipating flow energy. At lower slopes, the fishways create flow resistance conditions that are similar to those of boulder-filled headwater streams. A semi-empirical method is developed for the design of Denil fishways involving a fluid friction coefficient.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/fisheries/fish_passage/katopodis3.html
Page Contact Information: Contacting the Upper Midwest Environmental Sciences Center
Page Last Modified:
November 3, 2015
