Free Online Manning Pipe Flow Calculator

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, hv Velocity head, hv
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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