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Open Channel Flow Calculator
The Open Channel Flow Calculator is used to determine open-channel flow in circular pipes based on Manning's Equation:
where:
V is the cross-sectional average velocity (m/s)
n is the Manning coefficient of roughness
Rh is the hydraulic radius (m)
S is the slope of the water surface or the linear hydraulic head loss (m/m) (S = hf / L)
For more information on Manning's Equation, see: http://en.wikipedia.org/wiki/Manning%27s_equation
This calculator has been scaled to use English units. The Manning coefficient of roughness is built in for the following types of pipes: cast iron pipes in fair condition,
riveted steel pipes, vitrified sewer pipes, concrete pipes, wood-stave pipes, planed-plank pipes, and smooth or corrugated semicircular metal flumes.
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