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A unit used to measure the permeability of porous substances such as soil, equal to the passage of 1 cubic centimeter of fluid having a viscosity of 1 centipoise for 1 second under the pressure of 1 atmosphere through a medium having a volume of 1 cubic centimeter.

[After Henry Philibert Gaspard Darcy.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Units) geology a unit expressing the permeability coefficient of rock. Symbol: D
[named after Henri-Philibert-Gaspard Darcy (1803–58), French hydraulic engineer]


(Biography) (James) Les(lie). 1895–1917, Australian boxer and folk hero, who lost only five professional fights and was never knocked out, considered a martyr after his death from septicaemia during a tour of the United States
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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where [q.sub.t] is the water flow rate in the cross section, v is the flow speed, A is the area, [K.sub.w] is the Darcy permeability coefficient (water permeability coefficient), i is the hydraulic gradient which is equal to h/L, h is the missed head, and L is the height of soil sample.