Title

Problems with a Fishway on an Irrigation Barge in Japan

Publication Date

1995

Notes

Title, abstract, and figure legends in English, remainder of text in Japanese

Publication Title

Proceedings of the International Symposium on Fishways '95

Start Page

431

End Page

436

Publication Place

Gifu, Japan

Publisher

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

Abstract

In this paper, we discussed about problems of fishways on irrigation barrages in Japan from site studies, a model experiment of N barrage which is typical as a recent irrigation barrage. The results are below. (1) Low capability for weaker fishes than Ayu. Most of irrigation barrages have pool and weir fishways designed for Ayu which is the most important fish for fishing. (2) Instability of fishway inlet water level - Back water level can't be controlled with old irrigation barrages. Accordingly, flow state in a fishway may be unstable. (3) Obscurity of fishway inlets - Discharge over the barrage is conducted in whole width of the barrage with irrigation barrages. (4) Damages by flooding and scouring.

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