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Chezy: Developed and verified by experiments made on an earthen channel, the Courpalet Canal, and on the Seine River in late 1769.
Reference:
Chow, V.T., 1959, Open Channel Hydraulics: McGraw-Hill Book Co. NewYork, 680 p.

C Chezy coefficient
V Cross-sectional average flow velocity, in feet per second
R Hydraulic radius, in feet
S Slope, in feet per feet
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