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Rational Formula Runoff Depth:
 
Calculation:
Designer/Checker:
 
Input:
 
For Metric, all input units are converted for the calculation below then converted back for the output results. 
 
Peak discharge (qp - cfs or cms)
Drainage area (A - ac or ha)
Time of concentration (tc - min)

 
   
 
Output:
 
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Runoff depth, Q =
 
 



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