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Calculate NRCS Travel Time, Paths < 300 Feet:
NRCS kinematic wave formula for hydraulic paths less than 300 feet, used to calculate NRCS travel time, time of concentration.
 
Calculation:
Designer/Checker:
   
Input:  
   
Note: All metric units are converted to US standard units for the equations below then converted back to metric units. 
 
Manning's roughness coefficient (n)
Flow length (L - ft/ft or m/m)
2-year, 24 hour rainfall (P2 - in or mm)
Slope of hydraulic grade line or land slope (S - ft/ft or m/m)

 
   
 
Output:
 
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Tt =
 
 
 
 
 



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