Permeability (1) The capacity of soil, sediment, or porous rock to transmit water, the property of soil or rock that allows passage of water through it. (2) For a rock or an earth material, the ability to transmit fluids, the rate at which liquids pass through soil or other materials in a specified direction. It is measured by the rate at which a fluid of standard viscosity can move through a material in a given interval of time under a given Hydraulic Gradient. Permeability for underground water is sometimes expressed numerically as the number of gallons per day that will flow through a cross section of 1 square foot, at 60°F, under a hydraulic gradient of 100 percent. Permeability is equal to velocity of flow divided by hydraulic gradient. The following permeability terms apply: 1 Very Slow – less than 0.05 inch per hour, 2 Slow – 0.05 to 0.20 inch per hour, 3 Moderately Slow – 0.20 to 0.80 inch per hour, 4 Moderate – 0.80 to 2.50 inches per hour, 5 Moderately Rapid – 2.50 to 5.0 inches per hour, 6 Rapid – 5.0 to 10.0 inches per hour, and 7 Very Rapid – More than 10.0 inches per hour.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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