AutoCAD Civil 3D - Stormwater

AutoCAD Civil 3D - Stormwater

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*Pro
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Registered: ‎01-07-2011
Post 11 of 12

Re: Hydraflow - Modified Rational Method - Storm Duration

12-05-2012 12:30 PM in reply to: *Matt.Anderson

"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 Ernst, PE
C3D 2015 SP2
Ernst Engineering
www.ernstengineering.com
Employee
2,909 Posts
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Registered: ‎05-13-2005
Post 12 of 12

Re: Hydraflow - Modified Rational Method - Storm Duration

12-12-2012 12:34 PM in reply to: fcernst

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.

Matthew Anderson, PE
Product Manager
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