速流结构是治理公路大型泥石流的有效技术类型，由汇流槽和速流槽组成。

As one of the most effective techniques to control giant debris flow, the high-speed drainage structure is composed of both converge trough structure and high-speed drain trough structure.

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支沟是高频小规模泥石流沟，但是在一定条件下也可能爆发相当规模的大型泥石流。

Tributary debris flow is smaller and higher frequency one, but in some conditions, big debris flow can also be break up.

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