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Method and device for delaying the run-off of flash-storm water or ordinary rainwater from roofs and other surfaces with water-retention capability
Method and device for delaying the run-off of flash-storm water or ordinary rainwater from roofs and other surfaces with water-retention capability
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机译:延迟暴雨水或普通雨水从具有保水能力的屋顶和其他表面流出的方法和装置
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摘要
In order to retain water on the roofs of buildings with a water- retention basin, a vortex-type throttle valve is to be fitted on the flat roof and is to be connected to a drain pipe leading to a drain. The throttle valve makes it possible to control the rainwater run-off at a given rate determined by the size of the throttle valve. If rain falls at a high rate, the excess is retained. Overflow protection is provided by fitting on top of the throttle, a length of pipe which permits the unrestricted flow of water through the throttle valve. Alternatively, the drain pipe can be extended upwards to the maximum permitted water- retention level, thus allowing the water which exceeds this level to pass directly into the drain pipe.
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