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Permeability of Soil
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Soil permeability relates to groundwater flow, and is a measurement of continuous void space within a soil medium.
Constant head permeameters or falling head permeameter tests may be used to determine the coefficient of permeability of a given
soil sample in the lab. Field tests may also be used to estimate permeability, such as the auger hole method.
See the chart below for typical values (from Lindeburg):
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Typical coefficients of permeability, as presented by Lindeburg (8th ed.).
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Group Symbol (USCS)
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Typical coefficient of permeability (cm/s) |
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GW
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2.5 x 10-2
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GP
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5 x 10-2
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GM
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>5 x 10-7
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GC
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>5 x 10-8
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SW
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>5 x 10-4
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SP
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>5 x 10-4
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SM
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>2.5 x 10-5
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SM-SC
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>1 x 10-6
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SC
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>2.5 x 10-7
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ML
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>5 x 10-6
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ML-CL
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>2.5 x 10-7
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CL
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>5 x 10-8
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MH
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>2.5 x 10-7
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CH
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>5 x 10-8
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Other soil and soil related properties are listed below:
Angle of Internal Friction
Bearing Capacity Factors
Cohesion
External Friction Angle
Factor of Safety
Lateral Earth Pressure Coefficients
Modulus of Vertical Subgrade Reaction
Soil Unit Weights
Young's Modulus or modulus of elasticity
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