I've been given an assignment to model 2- and 100-year storms for a 70-acre site using EPASWMM. Previously, the local jurisdiction wasn't particular about what software was used on a project, but for some reason they are requiring SWMMM for this one. We have the appropriate IDF curves and coefficients needed to model runoff for those storms, except that EPASWMM doesn't use that data, and the users manual, etc., give no information on how to translate the IDF based data into something that can be input into the EPASWMM model. Can someone explain or point me toward a source that will describe how to develop storm runoff data using IDF coefficients, that can be input into the EPASWMM5.1 model?
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