洪峰水位（peak stage），是指一次洪水过程或整个汛期中的最高水位值。
来水量增多而河道比降变小，造成局部洪峰水位异常壅高。
Increasing of water and decreasing of gradient of channels, the flood water level rose abnormally in some local sections of river.
洪水影响因素复杂，洪峰水位和洪峰流量之间呈一种模糊关系。
Because of the complication of influence factor of flood, the relationship between flood peak level and flood peak discharge is uncertain.
洞庭湖蓄洪的能力关系到缓和洞庭湖自身流域的洪峰压力，同时也关系到缓和长江下游的洪水水位。
The capacity of flood storage in Dongting Lake is directly relationship with the alleviation of flood pressure coming from Xiang Zi Yun Li Rivers.
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