| After construction of Miwa dam, sedimentation due to a large amount of sediment inflow during floods was a continuing problemis in progress. In order to cope with this sedimentation problem and so on, a redevelopment project has been implemented. Sedimentation measures consist of the sediment bypass, sediment excavation and auxiliary sedimentation measure. Construction of the sediment bypass facility and sediment excavation were already completed. Examination of auxiliary sedimentation measures facility, a new approach to complement functions of sediment bypass, is in progress. Sediment accumulated in Miwa dam reservoir is characterized by a large proportion of fine particle diameter components. Therefore, the sediment bypass facility has been specifically designed as a facility to bypass only the fine sediment (wash load). In this paper, we explain an overview of the sediment bypass facility and report the results of the operations of the facility. In addition, we also report about the examination situation of the auxiliary facility. |
