Flood frequency (return period) is referring to recurrence probability of flood in certain period.
洪水频率(或重现期)是指一定时期内某种洪水出现的机率。
The systematic failure probability of flood-control system is difficult to evaluate because there is much difference among the risks of components of the system.
由于防洪体系组成部分的风险程度各异，综合的系统失事率难以评估。
The method of Analytic Hierarchy Process is used to identify the risk events of flood. The probability of flood is determined by construction period and flood control standard.
洪水风险事件识别采用层次分析法进行，并结合施工工期和防洪标准来确定洪水发生的概率。
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。
Moreover, under the situation of uncertainties in large historical flood, the quantities estimated by probability weighted moments may be more robust than those by a optimal curve fitting method.
在历史洪水存在不确定性情况下，以概率权重矩法估计的参数稳健性优于优化适线法。
Then, the distribution parameters of the probability model are amended using the small sample of the measured highest flood water level of last 10 years.
再利用后10年的实测最高洪水位的小样本，对模型的分布参数进行了修正。
Then, the distribution parameters of the probability model are amended using the small sample of the measured highest flood water level of last 10 years.
再利用后10年的实测最高洪水位的小样本，对模型的分布参数进行了修正。
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