Free Online Manning Formula Trapezoidal Channel Calculator

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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, h_v	Velocity head, h_v
Top width, T	Top width, T
Froude number, F	Froude number, F
Shear stress (tractive force), tau	Shear stress (tractive force), tau
Implied design ? riprap size based on n	Implied design ? 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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