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Calculate Stormwater Time of Concentration using Kerby's Equation:
*Developed from data obtained in watersheds having water cources less than 1200 ft, slopes less than 1% and areas less than 10 ac.
 
Calculation:
Designer/Checker:
   
Input:  
   
 
Kerby's roughness coefficient (n)
Length of overland flow (Lo - ft or m)
Slope of overland flow (S - %)

 
   
 
Output:
 
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Time of Concentration (Tc) =
 
 
 



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