Studies on Ecosystem Canal Structure in Settlement

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The results were summarized as follows.1) The hydraulic research were done on several weir shapes of drop part. As the result, discharge coefficient C was about 0.6. Nextly, natural stones were installed at drop part. The calculated discharge corresponded to the experimental discharge by dividing many cross sections, when C*0.6. The friction loss of flow direction was negligible.2) On fish way of stepped weir type, flow conditions in fish way were investigated. As the result, it became clear that tumbling flow and quasismooth flow coexist in the fish way. The dissipator size ofthe fish way was smaller than usual design of dissipator, under similar hydraulic conditions.3) The inhabitable conditions of pungitius sp.was investigated in Yamagata prefecture. Firstly, the inhabitable range to water quality was large at spot. Nextly, an irrigation pond size, water depth, discharge, bottom soil and so on were investigated.