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斯威士兰1978～1979年在Umbuluzi河上兴建一座高42m的摩焦利(Mojoli)堆石坝,水库库容1.52亿m~3。库区位于热带旋风区,据计算百年一遇溢洪道泄洪量为950m~3/s,但可能最大泄洪量达7,650m~3/s,为百年一遇泄洪量的8倍。坝址附近地势狭窄,要布置泄洪量大的溢洪道很困难。因此,在坝的右岸布置一条正常工作溢洪道,在左岸布置一条自溃式非常溢洪道。自溃式非常溢洪道宽120m,溢洪道上的自溃堰中间有座导墙,将堰体分为两段,左右两段高程相差60cm。
Swaziland constructed a 42-m-high Mojoli rockfill dam on the Umbuluzi River from 1978 to 1979, with a reservoir capacity of 152 million m 3. The reservoir area is located in the tropical cyclone zone. It is calculated that the spillway discharge volume per one-year spillway is 950m 3 / s, but the maximum flood discharge amount may reach 7,650m 3 / s, which is 8 times of the flood discharge volume once in a century. The narrow terrain near the dam site makes it very difficult to arrange spillways with large discharges. Therefore, a normal working spillway should be arranged on the right bank of the dam and a self-collapsing spillway should be arranged on the left bank. The self-collapsing spillway is 120m wide. There is a guide wall in the middle of the self-collapsing weir on the spillway. The weir body is divided into two sections, and the difference between the two sections is about 60cm.