Fish passage at corrugated metal pipe culverts is a complex issue owing in part to our relatively poor understanding of fish swimming performance as well as the flow conditions within the culvert. At the University of Manitoba we have undertaken a research program to help develop a better understanding of culvert hydraulics. This paper presents results from a series of physical model tests that were conducted in a 21 m long and 0.8 m diameter culvert in the Hydraulics Research and Testing Facility. Based on these physical model results, the preliminary results from an effort to develop a FLOW-3D model of our physical model tests are presented in addition to some lessons that we have learned thus far. Finally, we have developed an empirical model for the boundary shear stress distribution in corrugated metal pipe culverts as well as a set of empirically-based equations to predict the water velocity distribution in partially-filled culverts at normal depth.
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