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Calculate Stormwater Peak Discharge by Rational Formula:
 
Calculation:
Designer/Checker:
 
Input:
 
For Metric, all input units are converted for the calculation below then converted back for the output results. 
 
Runoff Coefficient (C)
Average rainfall intensity (I - in/hr or cm/hr)
Drainage Area (A - ac or ha)

 
   
 
Output:
 
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Peak rate of runoff discharge (qp) =
 
 



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