1.1 Project overview The Mou Reservoir in Cili County is located at the upstream of Sangmuxi, the first level tributary of Lishui River. It is a small (I) type project focusing on irrigation and combining power generation, flood control, water supply and other comprehensive benefits. The reservoir hydroproject is located in Sangmuxi Road, Lingyang Town, Cili County, 8km away from Cili County. The reservoir controls the rainwater collection area of 12.5km2, the length of the main stream above the dam site is 5.7km, and the average gradient of the main stream is 23.4 ‰. The maximum dam height is 43.20 m. The reservoir complex is mainly composed of permanent structures such as dam, spillway, water conveyance culvert, etc. Main work contents: dam reinforcement works, water release works, engineering observation facilities and other projects. Main quantities: dam danger removal and reinforcement works upstream dam slope seepage prevention: dam surface leveling 5595m2, slope cutting earthwork 3129m3, coarse sand cushion 1300m3, fine gravel cushion 975m3, C15 precast concrete slope protection 880m3, C15 concrete steps 95m3; dam danger removal and reinforcement works downstream dam slope trimming