Modeling question: The ahj has a minimum Tc = 5 minutes requirement. The available rainfall data for the project site has IDF curves for a series of storms with a minimum duration of 10 minutes and higher. Have you encountered such a scenario? It would appear to me that I don't necessarily need to have an IDF for a 5 minute duration. I am working on confirming the storm duration requirement from the ahj. Your thoughts and input is greatly appreciated (My apologies if this seems as hydrology and hydraulics 101 questions but its a few years since I touched on this topic).
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