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Chezy Equation

Conduits flow and mean velocity - the Chezy equation

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The Chezy equation can be used to calculate mean flow velocity in conduits:

v = c (R S)1/2                           (1)

where

v = mean velocity (m/s, ft/s)

c = Chezy roughness and conduit coefficient

R = hydraulic radius of the conduit (m, ft)

S = slope of the conduit (m/m, ft/ft)

In general the Chezy coefficient - c - is a function of the flow Reynolds Number - Re - and the relative roughness - ε/R - of the channel.

ε is the characteristic height of the roughness elements on the channel boundary.

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