💧 Manning's Equation Calculator

Calculate flow rate, velocity, and hydraulic parameters for open channel flow.
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Inputs

Q = (1/n) × A × R2/3 × S1/2
where: Q = flow rate, n = Manning's roughness, A = cross-sectional area, R = hydraulic radius, S = slope
Example: 0.001 for 0.1% slope
Typical values: concrete (0.012), PVC (0.009), earth (0.025)

Results

Enter channel parameters to calculate flow characteristics.

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