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The retarding basin decay factor is controlled by retarding or storage factor. Nowadays, the empirical formula of retarding factor is built based on the watershed morphometric. The roles of rainfall and decay coefficient are the important factors for controlling the threshold in predicting the flood. Generally, the analyses are carried out on the soil type parameter, watershed morphometric, and flood. This study intends to investigate the influence of soil parameters on the retarding factor as the new variable to the determination of the decay factor. The result is hoped that retarding basin factor is influenced by the soil texture, effective porosity of the soil, and soil conductivity hydraulic that is as the input for building retarding basin decay factor.