Travel Time / Time of Concentration Calculator
Calculate the travel time (or time of concentration) for channelized or shallow concentrated flow.
\( V = \frac{1.49}{n}\, R^{\frac{2}{3}} \sqrt{S} \) and \( T = \frac{L}{V} \)
* Enter the flow length \(L\) (ft), channel slope \(S\) (ft/ft), Manning’s roughness \(n\), and hydraulic radius \(R\) (ft).
Step 1: Enter Parameters
Example: 1000 ft
Example: 0.001 ft/ft
Example: 0.015
Example: 2 ft
This calculator uses Manning’s equation to estimate the flow velocity and then calculates the travel time (or time of concentration) as the ratio of the flow length to velocity.
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