Page - 346 - in Book of Full Papers - Symposium Hydro Engineering

relieved the sediment problem of the Manwan HPP. The storage below NWL, dead storage capacity and effective storage capacity have little change compared with the previous data. The total loss rate of the effective storage capacity below the normal water level - of 994m is 15.21%, and the total loss rate of the storage capacity below the dead water level - elevation: 982m is 77.47%. Suggestions: (1) After completion of the Xiaowan Reservoir, the data of the inflow and outflow sediment have been changed fundamentally, the sediment observation and analysis shall be conducted to know the rules for the sediment transport in the Manwan Reservoir, forecast the sediment problem in the reservoir and instruct the operation of the plant. (2) Regularly (normally 2---3 years) measure the cross section of sedimentation in the main stream and tributaries and the topographic map in the Manwan Reservoir. (3) Pay attention to the soil and water conservation. Continuously insist on the operation mode of the reservoir - “Storing Clear Water and Releasing Muddy.” ACKNOWLEDGEMENTS The authors gratefully appreciate the supports from National Natural Science Foundation of China (No.91647000 and No.91647201), and China Postdoctoral Science Foundation (No.2016M602934XB). In addition, the authors would also like to thank Kunming Engineering Corporation and Manwan Hydropower plant, who provided valuable material for this article. 346