Title
Experimental Study of Culvert Fishways
Date
1986
Keywords
baffles, culverts, design, flow rate, flow rates, hydraulics, model studies, prototype, resistance, scale models, spacing, weir, weir type
Summary
This report presents results of a preliminary experimental study on the hydraulics of culvert fishways (weir and baffle types) in a 1:6.75 scale model. Seven designs were tested. The first four designs were of the weir type and differed only in spacing (Design #1 - 980 mm, Design #2 - 490 mm, Design #3 - 245 mm), and Design #4 - 735 mm). These fish-weirs appeared to act like localized obstacles and the highest velocity occurred in the immediate vicinity of the fish-weirs. The last three designs were of the baffle type and again differed only in the spacing arrangement (Design #5 - 588 mm, Design #6 - 294 mm, and Design #7 - 194 mm). The results for designs 6 and 7 indicated that the baffles do not function like the fish-weirs but simply increased the resistance to flow thereby producing larger depths of flow and reducing the maximum velocities. All results presented in this report are generally in a dimensionless form for convenient use. To convert flow rates and velocities to prototype values, the Froude similarity criterion should be used.