In the South of Sichuan province a 240 MW Yeleh hydroelectric plant was constructed by Sichuan Nanya River Basin Hydraulic Power Development Company Limited, a stateowned enterprise, and China Gezhou Ba Water & Power Group Company Limited. This project sets out to develop the mountain cascade of the Nanya River, a tributary of the Dadu River, provide superior electricity and adjust flood peak & frequency. The specialist contractor Foundation Engineering Company of China Water Resource and Hydropower (FEC) was awarded the contract for foundation treatment at the right bank, which included the construction of a 75m deep concrete Cut-Off Wall (COW) inside a 6.0m x 6.5m tunnel. The requirement for 19,317m~2 COW to be constructed in permeable and very dense gravel/cobble formations and a demanding project program led FEC to adopt Bauer Low Headroom Cutter CBC25/MBC30 in conjunction with Overlap Cutter Joint (OCJ).
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