Today, rivers are controlled for many reasons, primarily to maintain reliable water supplies for daily, agricultural and industrial needs, for power generation, for navigation, and to prevent flooding.
Because of their rather loose nature and absence of controlled spillway, landslide DAMS frequently fail catastrophically and lead to downstream flooding, often with high casualties.
由于坝体疏松，缺少可控制的泄洪通道，堰塞坝极易溃坝并引发下游洪灾，造成大量人员伤亡。
3
The polymer injection objects should be strictly controlled to decrease difference between layers during polymer flooding in class II reservoirs;