Investigation of Culverts and Hydraulic Structures Used for Fishways and the Enhancement of Fish Habitat

Publication Date



culverts, design, fish habitat, fish performance, habitat, hydraulics, orifices, slot orifice, swimming, wing walls

Report number


Publication place

Moscow, Idaho


Water Resources Research Institute, University of Idaho


A method for the design of slot orifice fishways for box culverts was developed. Characterisitcs for a satisfactory fishway are identified. Appropriate graphs for sizing slot orifice fishways for a given performance capability of a fish are presented. The hydraulics of slot orifices constructed in the face of skewed wingwalls is explained. A table listing the swimming capability of various species of fish was compiled from existing literature. A hodograph for the wake boundary behind a flat plate placed normal to free surface flow was developed. A comparison of the size of wakes produced by a flat plate, a 90-degree wedge, and a circular cylinder were made. The shape of wakes produced by embedded sphere with different degrees of submergence was also studied.

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