一些屋顶排水沟的挡板式设计打破了排水水流交换落水管，所以它不会削弱地下。
Some roof gutter exchange downspouts for baffle type designs break up the stream of drained water, so that it does not erode the ground below.
用活动金属挡板及水封井附加控制阀门封闭油罐组排水沟的方法既不可靠又会使流淌火面积扩大。
The method using movable metal baffle and control valve near water sealed well to block the drain of oil tank group is unreliable and it will widen flowing fire area.
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