Reservoir sedimentation is one of the most important problems for securing long term achievement of water power operation in the future. In order to solve the problem, we have to note that there are two major types of water power stations, which are storage type and regulating type, respectively. We have already discussed that we have to focus on sedimentation management in regulating type reservoirs more than storage type ones from the view point of flood disaster prevention in reservoir areas. In this paper, we study on technical and economical feasibility of sediment sluicing management by numerical analysis, and we found that it is very much advantageous in both way. We also analyze the relation between trap efficiency of reservoir sediment and proportion of spillway gate size and dam height, and get some outcomes which are useful for dam gate remodeling.
