Experimental Study of Culvert Fishways
baffles, culverts, design, flow rate, flow rates, hydraulics, model studies, prototype, resistance, scale models, spacing, weir, weir type
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.
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