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本文从概率论及数学统计法基本原理出发，根据枯水期间水库的水量平衡方程，考虑在 各年间枯水期变化的影响，提出了所谓“积的组合频率法”，导出了相应的计算公式，以求 解—定保证率及固定引用流量时年调节水库的有效库容：
Based on the basic theory of probability theory and mathematical statistics, according to the water balance equation of reservoirs in low water period and the influence of the change of dry season in each year, a so-called “combined frequency method” is proposed and the corresponding formulas are derived to solve - a fixed guarantee rate and a fixed reference flow year effective reservoir capacity: