erosion-control dam; soil-saving dam
Technical term in civil engineering and forestry for a dam built to prevent erosion and stabilize slopes.
この地域には治山ダムがいくつか設置されている。
Several erosion-control dams have been installed in this area.
治山ダムは土砂災害を防ぐ役割を果たす。
Erosion-control dams play a role in preventing sediment disasters.
Compound of 治山 (chisan, 'mountain conservation') and ダム (damu, 'dam'). The term is a modern technical coinage.