"Hydraflow Hydrographs will stop figuring the Intensity out when it hits 60 minutes which is the highest value in the IDF curve it can calculate."
This is incorrect. It uses the FHA IDF curve equation to extrapolate out past the 60 minute intensity value.
The SDF stopping at 9.9 is an issue development has been notified.
A bit of clarification on the statement regarding IDF calculations stopping at 60 minutes back when I noted it in 2009. The defects have been fixed.
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