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美国蒙大拿州北部舍伯恩湖上有一条老土坝,1973年洪水调查表明:该地区的洪水危害要比原设计大得多,原设计流量为9.670英尺~3/秒,而目前可能出现最大洪峰流量达32700英尺~3/秒,而修建于1920年的斜槽式混凝土溢洪道,因损坏堵塞,使原66000英亩-英尺的蓄洪调节水库,现只能从一个失控的喇叭形溢洪道泄水,溢洪道及其泄水建筑物的最大泄水能力为4200英尺~3/秒。如果发生上述洪水,其最低水位也要超出坝高1.6英尺,这样,即会出现垮坝的危
An old earth dam on Lake Sherborne in northern Montana, United States, conducted a flood investigation in 1973 that showed floods in the area were significantly harder than the original design, with a projected design flow of 9.670 ft 3 / s, which is currently possible The maximum peak flow reached 32,700 ft3 / s. The chute concrete spillway, built in 1920, was damaged and plugged so that the original 66,000-acre-ft flood-control reservoir could now only be drained from a runaway flaring spillway Spillway and its drainage structures have a maximum capacity of 4,200 ft3 / s. In the event of such floods, the minimum water level should exceed the height of the dam by 1.6 feet, so that a danger of collapse will occur