Title

Fish Passage Behavior for Severe Hydraulic Conditions in Baffled Culvert

Document Type

Article

Journal/Book Title/Conference

Journal of Hydraulic Engineering

Volume

140

Issue

3

Publication Date

1-1-2014

First Page

322

Last Page

327

DOI

10.1061/(ASCE)HY.1943-7900.0000831

Abstract

Laboratory tests were conducted with brown trout to evaluate their ability to pass through a small, baffled prototype-scale culvert under a variety of culvert slopes and discharge conditions. The culvert was 18.3 m long and 0.60 m in diameter with 0.15D0.15D baffle height and 0.9D0.9D spacing, where DD is the culvert inside diameter. An inverse relationship was observed between fish passage success and flow rate and/or culvert slope. The influence of the sample fish population and the length of the individual fish on passage rates were investigated; the data showed that the brown trout fish passage sample size evaluated in this study (25 per test) was sufficiently large to minimize sample size dependency. The elapsed time required for fish to traverse the culvert decreased with increasing hydraulic difficulty primarily owing to diminishing resting zones. The behavior of fish traversing the culvert was observed and reported, including resting/staging zone locations.

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