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
X
X
X
X
X
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X
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 for rock size per Strickler n for rock size per Strickler X
n for rock size per Blodgett n for rock size per Blodgett X
n for rock size per Bathurst n for rock size per Bathurst X
Blodgett vs. Bathurst Blodgett vs. Bathurst X
Required bottom angular rock size, D50 (Isbash & MC) ? Required bottom angular rock size, D50 (Isbash & MC) ? X
Required side slope 1 angular rock size, D50 (Isbash & MC) ? Required side slope 1 angular rock size, D50 (Isbash & MC) ? X
Required side slope 2 angular rock size, D50 (Isbash & MC) ? Required side slope 2 angular rock size, D50 (Isbash & MC) ? X
Required angular rock size, D50 (Maynord, Ruff, and Abt 1989) Required angular rock size, D50 (Maynord, Ruff, and Abt 1989) X
Required angular rock size, D50 (Searcy 1967) Required angular rock size, D50 (Searcy 1967) X

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