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Empirical formula for EPASWMM runoff

I am using EPASWMM Runoff method for the runoff generation and i have calculated the all the catchment characteristics such as catchment slope and characteristic width(m) and Curve number also calculated based on soil characteristics and am using standard Time intensity curve generated from DUBAI IDF curve . Can anyone tell me the Empirical Formaula relating all catchment parameter and how the runoff is generated in each catchment.