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Calculate Stormwater Time of Concentration for Overland Flow:
*Kinematic Wave Formula - recommended for parking lots and streets
 
Calculation:
Designer/Checker:
   
Input:  
   
   
 
Rainfall Intensity (I - in/hr or mm/hr)
Length of Overland Flow (Lo - ft or m)
Manning roughness coefficient (n)
Average Slope of Drainage Area (S - ft/ft or m/m)

 
   
 
Output:
 
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Time of Concentration (Tc) = ((0.94)(Lo^0.6)(n^0.6))/((I^0.4)(S^0.3))
Metric: Tc = ((6.92)(Lo^0.6)(n^0.6))/((I^0.4)(S^0.3))
 
 
 
 



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