Correct Answer - Option 4 : Clay
Explanation:
Permeability is the property of soil to transmit water through it.
It is usually expressed either as a permeability rate in centimeters per hour (cm/h), millimeters per hour (mm/h), or centimeters per day (cm/d) or as a coefficient of permeability k in meters per second (m/s) or in centimeters per second (cm/s).
For the different soil types as per grain size, the orders of magnitude of permeability are as follows:
Type of soil |
Permeability (cm/s) |
Gravel |
1 |
Coarse sand |
1 to 0.1 |
Medium sand |
10-1 to 10-2 |
Fine sand |
10-2 to 10-3 |
Silty sand |
10-3 to 10-4
|
Silt |
10-5
|
Clay |
10-7 to 10-9 |
From the table, Clay has the Coefficient of permeability ranges of 1 × 10– 7