Free Online Manning Pipe Flow Calculator

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Manning Formula Uniform Pipe Flow at Given Slope and Depth

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Set units:

Pipe diameter, d₀
Manning roughness, n ?
Pressure slope (possibly ? equal to pipe slope), S₀
Percent of (or ratio to) full depth (100% or 1 if flowing full)

Results

Flow, Q	Flow, Q
Velocity, v	Velocity, v
Velocity head, h_v	Velocity head, h_v
Flow area	Flow area
Wetted perimeter	Wetted perimeter
Hydraulic radius	Hydraulic radius
Top width, T	Top width, T
Froude number, F	Froude number, F
Shear stress (tractive force), tau	Shear stress (tractive force), tau

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