We estimate that any time that the rainfall in the water catchment area exceeds 600 millimeters, we will have a perilous situation. But in recent years rainfall has often exceeded 1000 millimeters, so siltation has become inevitable.
據我們估計，石門集水區只要降雨超過 600 毫米，就會發生災害，而近年颱風雨量動輒上千毫米，泥砂難以避免。