Free Online Manning Formula Trapezoidal Channel Calculator

Manning Formula Uniform Trapezoidal Channel Flow at Given Slope and Depth

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Set units:
Bottom width
Side slope 1 (horiz./vert.)
Side slope 2 (horiz./vert.)
Manning roughness, n ?
Channel slope
Flow depth
Bend Angle? (for riprap sizing)
Stone specific gravity (2.65)
Results:
Flow area Flow area
Wetted perimeter Wetted perimeter
Hydraulic radius Hydraulic radius
Velocity, v Velocity, v
Flow, q Flow, q
Velocity head, hv Velocity head, hv
Top width, T Top width, T
Froude number, F Froude number, F
Shear stress (tractive force), tau Shear stress (tractive force), tau
Implied riprap size based on n Implied riprap size based on n
Required bottom angular riprap size, D50, Maricopa County Required bottom angular riprap size, D50, Maricopa County
Required side slope 1 angular riprap size, D50, Maricopa County Required side slope 1 angular riprap size, D50, Maricopa County
Required side slope 2 angular riprap size, D50, Maricopa County Required side slope 2 angular riprap size, D50, Maricopa County
Required angular riprap size, D50, per Maynord, Ruff, and Abt (1989) Required angular riprap size, D50, per Maynord, Ruff, and Abt (1989)
Required angular riprap size, D50, per Searcy (1967) Required angular riprap size, D50, per Searcy (1967)

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