Temporarily Installed Long, Steep Denil Fishway on the Ohkohchi-Sabo Dam in the Abe-Gawa River

Publication Date


Publication Title

Proceedings of the International Symposium on Fishways '95

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Publication Place

Gifu, Japan


The Organizing Committee for International Symposium on Fishways '95 in Gifu


This paper presents a summary of the Ohkohchi Temporary Denil Fishway Project. In this project, a small, but long and steep Denil fishway has been installed on a temporary spillway channel at the Ohkohchi sabo-dam. After the failure in the initial design of twin-line fishway with shallow resting pools, trials of various devices to improve the fishway and evaluation study have been carried out since 1993. The major improvement includes changing to a zigzag single-line system resulting in a change of flow direction in each pool and the addition and modification of resting pools. After these changes, successful ascent of the fishway by some fishes was confirmed.

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