Manning's equation —

Uniform steady flow · symmetric trapezoid · SI units

Inputs

Sensitivity sweepChart the response across a range

Cross-section

Drawn to scale · dashed line is top of bank

Sensitivity sweep

Results

Normal depth — m
Flow area, A
— m²
Wetted perimeter, P
— m
Hydraulic radius, R
— m
Top width, T
— m
Mean velocity, V
— m/s
Froude number, Fr
—
Flow regime
—
Capacity at H
— m³/s
Freeboard
— m

Q = (1/n)·A·R^(2/3)·√S₀ · normal depth by bracketing Q(y) and bisection · prismatic channel, uniform flow · User is responsible for verifying outputs.

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