NRCS Travel Time Calculator

Estimate the time of concentration (travel time) using the NRCS/Kirpich equation:
\[ T_c = 0.0078 \frac{L^{0.77}}{S^{0.385}} \]

* Enter the watercourse length \( L \) (ft) and the slope \( S \) (ft/ft).

Step 1: Enter Parameters

Length \( L \) (ft):

Example: 1000 ft

Slope \( S \) (ft/ft):

Example: 0.01 ft/ft

Calculated Time of Concentration