It refers to space during dam crest level; it is above maximum deposited beach face, storage bottom and normal water level as well as under maximum flood level.
某坝顶标高时，最高沉积滩面、库底、正常水位三者以上，最高洪水位以下的空间。
As an example, the overtop failure probability of a dike under different floodwater standards is analysed using measured annual maximum flood level at a hydrological station.
以某水文站实测的年最高洪水位为例，对现有堤防在不同的设防标准下漫顶失效概率进行了分析。
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