This is using the power of Nature itself to get twice the results with half the effort. Moreover, because the water volume in the sedimentation season exceeds dam capacity anyway, there will not be any waste of water resources. This plan has two major side benefits.
這就是所謂的「水力排砂」，利用大自然的力量讓排砂效益事半功倍，而且由於汛期的水是超出庫容的，也不致造成水資源的浪費。