Manning’s Equation For Open Channels
One of the more popular of the numerous equations developed for determination of flow in an open channel is Manning’s variation of the Chezy formula:
V=C ?RS
where
R= hydraulic radius, ft (m)
V =mean velocity of flow, ft/s (m/s)
S= slope of energy grade line or loss of head due to friction, ft/linear ft (m/m), of channel
C =Chezy roughness coefficient
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