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:
Results
Flow area
Wetted perimeter
Hydraulic radius
Velocity, v
Flow, Q
Velocity head, hv
Top width, T
Froude number, F
Shear stress (tractive force), tau
Implied riprap size based on n
Required bottom 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 angular riprap size, D50, per Maynord, Ruff, and Abt (1989)
Required angular riprap size, D50, per Searcy (1967)

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