At the same time, these works effectively eliminate the power of soil and rock to carve into the riverbed, moderating its steepness; otherwise the riverbed will become deeper and wider, and will carry ever more mud and sand.
同時，一層層的壩體工程，讓河床陡坡變成緩坡，有效消減了土石切割的能量，否則河床不斷切深切寬，又會帶來更多泥砂。