contraction coefficient

(1) Ratio between the decreased length, area of section, or volume and the original length, area of section, or volume.

(2) In hydrometry: the ratio of the normal wetted cross-sectional area of the vena contracta to the nominal cross-sectional area of an orifice or weir opening.



UNESCO/WMO International Glossary of Hydrology (2nd revised ed., 1992)

Posted on February 8, 2014 .