Sanjiangkou Hydropower Station
Second Awards of National Excellent Investigation Project
First Prize of Excellent Engineering Survey of Hunan Province
The project adopts technology of “T-shape tail pier” energy dissipation for the first time in China.
Sanjiangkou power station is located Shimen County of Hunan Province, at middle and downstream of Lishui River main stream. It is a medium-sized comprehensive hydropower project mainly engaged in power generation. Construction of the Project started in 1976 and accomplished in 1988. In 2005, the project was extended on the left bank and accomplished the extension in 2007. Total reservoir capacity is 220 million m3 . It is built with concrete gravity dam, with crest height 34m, and low-head runoff power station, river bed type powerhouse, with vertical axial turbine and generator units, with installed capacity of 112.5MW(5×12.5MW+2×25MW), Vertical Axial-flow turbine-generator Unit （5×12.5MW）and Bulb Tubular Unit（2×25MW）. The bulb tubular turbine units has maximum water head of 19m, rated water head of 14.5m, minimum water head of 9m. The turbine runner’s diameter is 4.7m. The dam area has complicated geological condition and developed Karst. The problem of karst at dam foundation has been successfully resolved through detail investigation and aborative design, which provide important reference for the similar project.