Velocity (\( V = \frac{1.486}{n} R^{2/3} S^{1/2} \)):

Where:

• \( V \) is the velocity, in feet per second (ft/sec).
• \( n \) is the roughness coefficient.
• \( R \) is the hydraulic radius of the channel, in meters (m).
• \( S \) is the slope/gradient of the channel.