Graduate Thesis Or Dissertation
 

Countersunk culvert hydraulics for upstream juvenile fish passage

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fj2365317

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  • Twenty-one countersunk culverts in Oregon were inventoried to establish baseline information for the stream crossings so that subsequent resurveys can assess the long-term stability and functionality of the culvert design. A subset of the inventoried culverts was selected for detailed hydraulic measurements. The detailed velocity measurements were used to help derive an empirical model, which will calculate the proportion of a cross-section that is less than or equal to a particular velocity. The model could be used in the design stages of countersunk culvert installations to determine what proportion of the culvert cross-section will be within a swimming velocity of a fish species and age class of interest at a specific fish passage design discharge. Natural channel roughness equations were examined for application to countersunk culverts, which is a stream simulation design. A weighting factor to account for corrugation roughness along the sides of the culvert is proposed. The roughness equations corresponded well with back-calculated roughness values.
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