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Field observations of the performance of culverts with fish passages during winter

Author(s): Jean-Robert Ladouceur; Tadros Ghobrial

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Keywords: River Ice; Ice-Structure Interaction

Abstract: The Federal Fisheries Act under the Department of Fisheries and Oceans Canada (DFO) has mandated in its 2016 guidelines that any construction of culverts or renovation of existing ones, must take into consideration fish habitat and the free circulation of fish in water courses. The design guidelines of these fish passages are based on open water conditions and does not consider ice effects. It has been observed that the ice cover within culverts is generally thicker, can start earlier and stay longer than the upstream and downstream reaches. This can alter the ice formation and break-up processes in the water course and might have an adverse effect on fish movement and spawning. This paper presents preliminary results of a field monitoring program over two winters (2020-2021 and 2021-2022) for two culverts built in the administrative region of Chaudière-Appalaches in Quebec. Each culvert has a different fish passage type: baffles and stream bed simulation. The results include meteorological conditions, water depths and temperatures, as well as dissolved oxygen concentration and ice characteristics. To conclude, a discussion on the design of these fish passages in culverts for winter conditions is provided.

DOI:

Year: 2022

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