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土壤前期含水情况是影响暴雨徑流关系的重要因素之一。土壤前期含水情况除極小的試騐場外,一般不直接測定,而用相对的指标表示。水利部水文局1954年編寫的“洪水报方法”中,介紹了三种表示土壤前期含水情况的方法:卽前期徑流量法、前期影响雨量法和前期影响吸水量法;并且認为用前期影响吸水量來表示土壤前期含水情况最切合实际和成果最佳。前期影响吸水量的公式为
Pre-soil water content is one of the important factors affecting the relationship of stormwater runoff. Pre-soil water conditions in addition to the extremely small test site, generally not directly measured, but with the relative indicators said. In the Methods of Flood Reporting compiled by the Hydrology Bureau of the Ministry of Water Resources in 1954, three methods for indicating pre-soil water content were introduced: 卽 pre-runoff method, pre-impact rainfall method and pre-impact water absorption method; It is the most practical and best to influence the amount of water absorbed to indicate the pre-soil water content. Pre-impact water absorption formula