Darcy 3
Darcy 3 : A unit of permeability. A porous medium has a permeability of 1 Darcy when a pressure of 1 atmosphere on a sample 1 cm long and 1sq, cm in cross section will force a liquid of 1-cp viscosity through the sample at the rate of 1 cc per sec. (Bul 10C, Bul D11)