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在水文学中,用公式T=1/P表达重现期与机率之间数量上的关系。这里,P为某水文量≥某值的机率,T为相应的重现期。当然,≤某值也是一样的,下面一律按≥某值讨论。对于水文学中经常采用的年最大值法取样得到的水文值系列来说,这公式是适用的。但是将这公式应用到给排水工程中来时,就要注意其适用条件了,因为给排水工程中处理的不都是年最大值法取
In hydrology, the quantitative relationship between the return period and the probability is expressed using the formula T=1/P. Here, P is the probability of a hydrological quantity ≥ a certain value, and T is the corresponding return period. Of course, a value of ≤ is also the same, and the following discussion is based on ≥ certain values. This formula is applicable to the hydrological value series sampled by the annual maximum method often used in hydrology. However, when this formula is applied to water supply and drainage projects, it is necessary to pay attention to the applicable conditions, because the treatment of the water supply and drainage project is not based on the annual maximum method.