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Calculate Stormwater Time of Concentration using the FAA Formula:
 
Calculation:
Designer/Checker:
   
Input:  
   
 
Rational coefficient of the watershed (C)
Length of drainage path (L - ft or m)
Average slope of drainage area (S - %)

 
   
 
Output:
 
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Time of Concentration (Tc) =
 
 
 



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