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當洪水通過蓄水池塘洩水建築物時,在它的上游要局部地加以控制(變態)和削减洪峯,这种变态可分下列几个阶段,很容易在洪水水型图上表示了(图一):1、蓄水池塘蓄水至坐落在池中正常壅水位上的洩水孔底坎高程,这种蓄水耗去洪水的一部(Wo)2、蓄水池塘蓄水至正常壅水位高程以后,洩水孔開始發生作用(洩水),但它在初期不能及時把來到的全部洪水放
When floodwater drains a building through a pond, it is controlled upstream (metamorphosis) upstream of it and its peak is cut off. The metamorphosis can be divided into the following stages and is easily represented on the flood pattern Figure 1): 1. The water storage pond is filled with water to the height of the bottom of a scupper located at the normal water level in the pond, which consumes one part of the water (Wo) 2, and the water storage pond is filled up to normal After the water level elevation, the spillway began to play a role (drainage), but it can not be timely in the early arrival of all the flood