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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Inputs
X
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X
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Results
Flow area Flow area X
Wetted perimeter Wetted perimeter X
Hydraulic radius Hydraulic radius X
Velocity, v Velocity, v X
Flow, Q (See notes) Flow, Q (See notes) X
Velocity head, hv Velocity head, hv X
Top width, T Top width, T X
Froude number, F Froude number, F X
Shear stress (tractive force), tau Shear stress (tractive force), tau X
n per Strickler n per Strickler X
n per Blodgett n per Blodgett X
n per Bathurst n per Bathurst X
Blodgett vs. Bathurst Blodgett vs. Bathurst X
Required bottom angular riprap size, D50, Maricopa County ? Required bottom angular riprap size, D50, Maricopa County ? X
Required side slope 1 angular riprap size, D50, Maricopa County ? Required side slope 1 angular riprap size, D50, Maricopa County ? X
Required side slope 2 angular riprap size, D50, Maricopa County ? Required side slope 2 angular riprap size, D50, Maricopa County ? X
Required angular riprap size, D50, per Maynord, Ruff, and Abt (1989) Required angular riprap size, D50, per Maynord, Ruff, and Abt (1989) X
Required angular riprap size, D50, per Searcy (1967) Required angular riprap size, D50, per Searcy (1967) X

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