在水电站设计中,常常允许水库的非常洪水位超过其正常高水位。当水位增高时,水库洩放的洪水量也随之增大,如果水库面积比较大,对於进库的洪水也起着停蓄作用,减低了洪峰,也就减少 In hydropower station designs, it is often permissible to allow the reservoir to flood beyond its normal high water level. When the water level increases, the discharge of the reservoir also increases the flood, if the reservoir area is relatively large, for the flood into the reservoir also plays a role in saving, reducing the peak, it reduces