N a channel that carries away surplus water, as from a dam (坝中的)溢洪道 (Also called wasteweir, spill)
The water-wing always appears when discharge is smaller on steep slope of stepped spillways.
水翅是大坡度台阶式溢洪道在流量较小时出现的一种水流现象。
Stepped spillway is one of the new kinds of the spillways with high rate of energy loss, which is based on RCC technique .
台阶式溢洪道是结合RCC技术提出的一种具有高消能率的溢洪道新形式。
But experts say the situation would have been far worse if not for the levees, spillways and other flood controls built along the river.
但专家称，如果不是沿河修建的堤坝，溢洪道和其它防洪设施，情况会更糟糕。
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