* Log In to use the Calculate function *


Become a Member!





 
Calculate Stormwater Runoff by Modified Rational Method:
 
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)
Infiltration rate (F - in/hr or cm/hr)
Drainage Area (A - ac or ha)

 
   
 
Output:
 
Login to enable the Formulas!

Not a Member? Join Now!
 
Maximum rate of runoff discharge (qp) =
 
 
 
 
 
 
 
 
 
 



Start Using The Calculations >>> Become A Member Now!