Correct Answer - Option 2 : permeability
Concept:
Capillarity is the rise of water in air voids of soil mass by the action of surface tension of water. In other words, it is the primary force in soil system which is responsible for retaining the water inside soil.
Permeability (k) is an engineering property of soils and is a function of the soil type. Its value depends on the average size of the pores and is related to the distribution of particle sizes, particle shape and soil structure.
For different soil types as per grain size, the orders of magnitude for permeability are as follows:
|
Type of soil
|
Permeability (cm/sec)
|
|
Gravel
|
100
|
|
Coarse Sand
|
100 to 10-1
|
|
Medium Sand
|
10-1 to 10-2
|
|
Fine Sand
|
10-2 to 10-3
|
|
Silty Sand
|
10-3 to 10-4
|
|
Silt
|
1 × 10-5
|
|
Clay
|
10-7 to 10-9
|
Soil porosity is the volume of voids or pores between soil particles. These voids can be filled either by air or by water or by both.
