The spillway face are RCC benched spillway face.

溢流坝面为碾压混凝土台阶式溢流面。

The dam builders underestimate the risk of spillway failure.

水坝工程师低估了泄洪道失控的风险。

The third function of the spillway is to discharge sand.

此外，飞沙堰还有一个重要的作用就是排沙。

In early July 2010, the lake finally began flowing over the spillway.

2010年7月初，堰塞湖终于通过泄洪渠开始放水。

The control section of spillway is the key section to curb the water flow.

溢洪道控制段是控制水流下泄的关键部位。溢洪道；溢水管。