Manning equation online calculation
Calculation of the roughness coefficient, flow rate, hydraulic radius, and slope of the line
Select the appropriate unit and enter a value and click on "Calculate". The result will be displayed.
Calculate Manning Roughness Coefficient
n = Manning's Roughness Coefficient
R = Hydraulic Radius
S = Line Slope
V = Flow Velocity
\(n=\frac {1.49×R^{0.66}×S^{0.5}}{V}\)
Known data: hydraulic radius; line slope; flow velocity, what is the manning roughness coefficient.
Input data: hydraulic radius: 50 ft; line slope: 0.5; flow velocity: 10 ft / sec
Output: manning roughness coefficient: 1.39313
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