UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

Manning equation
An equation used to compute the velocity of uniform flow in open channel: V=1.486/n R2/3 S1/2, where V is the mean velocity of flow (in cfs units), R is the hydraulic radius in feet, S is the slope of the channel or sine of the slope angle, and n is the Manning roughness coefficient [1]. See also Chezy equation; Froude number; Reynolds number.