Rick Jackson
Survey CAD Technician VI
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Yes, I don't know why it is doing that. You should be able to take it out further, to the critical duration, to get your max required storage.
Consider the two calculations I ran with identical basin parameters: A = 10 ac, C = 0.75, Tc = 20 min, Qtarget = 1.0 cfs below:
I ran one in Hydraflow Hydragraphs shown first below, the second was in Hydraflow Express, shown below that.
Hydraflow Express has a couple of display issues going on also:
"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.
Fred -
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.