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Definition of permeability

Categorized under "General"

Definition as written by Magpye:

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.

Definition as written by IA_Soil_Sci:

Permeability. The quality of the soil that enables water or air to move downward
through the profile. The rate at which a saturated soil transmits water is accepted
as a measure of this quality. In soil physics, the rate is referred to as “saturated
hydraulic conductivity,” which is defined in the “Soil Survey Manual.” In line with
conventional usage in the engineering profession and with traditional usage in
published soil surveys, this rate of flow continues to be expressed as
“permeability.” Terms describing permeability, measured in inches per hour, are as
follows:
Impermeable ............................. less than 0.0015 inch
Very slow ..................................... 0.0015 to 0.06 inch
Slow ................................................... 0.06 to 0.2 inch
Moderately slow................................... 0.2 to 0.6 inch
Moderate .................................. 0.6 inch to 2.0 inches
Moderately rapid .............................. 2.0 to 6.0 inches
Rapid ................................................. 6.0 to 20 inches
Very rapid ................................... more than 20 inches


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