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NRCS Travel Time
NRCS Travel Time
NRCS kinematic wave formula for hydraulic paths less than 300 feet, used to calculate NRCS travel time, time of concentration.
Manning's roughness coefficient (n)
Flow length (L)
2-year, 24 hour rainfall (P2)
Slope of hydraulic grade line or land slope (S)
CALCULATE
RESET
Result
Travel time
hr
n - Manning's roughness coefficient
L - Flow length
P2 - 2-year, 24 hour rainfall
S - Slope of hydraulic grade line or land slope
Tt - Travel time
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