逕流的调节计算通常採用的有两种方法。第一种是根据过去观测到的原始水文资料按照时历次序进行调节,称为时历计算法。第二种是用机率原理把原始的水文资料整理成逕流的统计特性(即W,Cv,Cs)然后再进行计算,称为数学统计法。作为时历计算的基礎的最重要的假设,就是认为河中未来的逕流特性,以及年与年间逕流的配合,和 There are two methods commonly used for regulation of runoff. The first is based on the observed in the past the original hydrological data in the calendar order to adjust, known as the calendar calculation. The second is to use probability theory to organize the original hydrological data into statistical properties of runoff (ie, W, Cv, Cs) and then calculated, called mathematical statistics. The most important assumption underlying the calculation of the calendar is the consideration of the future runoff characteristics of the river, as well as the co-ordination of annual and annual runoff, and