dam for water supply ==> 供水用坝 dam foundation ==> 坝基,建坝的地基，它包括河床和两岸放置坝体的部位，及其邻近承受坝体及水体等作用的部位 ..
双语例句
1
Tocks Island dam, designed for flood control, watersupply, and recreation, cannot solve the long-standing and growing problems that dam supporters pointed to.