设计洪水计算方法主要是可能最大降雨和水文频率法。
The main methods for calculating designed flood are probable maximum precipitation and hydrologic frequency analysis.
无资料地区设计洪水的区域频率分析包括选择相似流域组、估计指标洪水以及推求区域综合增长曲线和设计流域的洪水频率曲线。
Regional flood frequency analysis for un-gauged basins included selecting a pooling-group, estimating the index flood, deriving pooled growth curve and fitting flood frequency curve for tested basin.
区域频率分析能充分利用相似流域组的资料来扩充信息量，克服单站样本系列资料短缺的局限，解决无资料地区设计洪水的估算问题。
Regional flood frequency analysis is a useful approach method that avoids the shortness of at-site sample series and estimates design flood for un-gauged area.
尽管中国有悠久历史，但利用历史洪水展延洪水频率曲线以求稀遇设计洪水，仍感困难和不可靠。
Although there is a long history in China, it is very difficult and unreliable to extrapolate frequency curve to long recurrence design floods.
水库设计洪水就是在给定工程安全标准情况下某个典型洪水过程，设计洪水的频率特征表现的就是其水文风险。
Designed flood of reservoir is a typical flooding process under given engineering safety standard. The frequency of designed flood is regarded as hydrological risk.
水库设计洪水就是在给定工程安全标准情况下某个典型洪水过程，设计洪水的频率特征表现的就是其水文风险。
Designed flood of reservoir is a typical flooding process under given engineering safety standard. The frequency of designed flood is regarded as hydrological risk.
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