Manning's equation: open channel flow
Set the channel width, depth, slope and lining to see the velocity and the discharge.
Works in metric or imperial units.
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Questions students ask
What is the hydraulic radius?
The flow area divided by the wetted perimeter (the length of channel touching the water).
What formula does it use?
V = (1/n) R^(2/3) S^(1/2); Q = AV.
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