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Reservoir sedimentation is one of the most important problems for securing long term achievement of hydropower plant operation in the future. We have already classified the sedimentation problems regarding the reservoir types and proposed effective sediment control measures for regulating reservoirs. On the other hand, sedimentation problems in storage reservoirs need to be more studied. In this paper, we have evaluated the influence of sedimentation progress in storage reservoirs on power generation by analyzing long-term operation record. Finally, future influence of reservoir sedimentation was predicted from the viewpoints of changing active storage capacity, inflow water regime and the maximum hydropower discharge.