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Rational Formula Hydrograph Method Detention Storage Volume:
 
Calculation:
Designer/Checker:
 
Input:
 
For Metric, all input units are converted for the calculation below then converted back for the output results. 
 
Pre-development peak discharge (qpb - cfs or cms)
Pre-development peak discharge (qpa - cfs or cms)
Post development time of concentration (tca - min)

 
   
 
Output:
 
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Storage volume, Vs =
 
 



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