|
Soil description |
Coefficient of permeability (mm/sec) |
Degree of permeability |
|
Coarse gravel |
Greater than 1 |
High |
|
Fine gravel -fine sand |
1 to 10–2 |
Medium |
|
Silt-sand admixtures, loose silt, rock flour and loess |
10–2 to 10–4 |
Low |
|
Dense silt, clay-silt admixtures, non-homogeneous clays |
10–4 to 10–6 |
Very low |
|
Homogeneous clays |
Less than 10–6 |
Almost impervious |
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