Correct Answer - Option 1 : Decreased
Concepts:
Hydraulic conductivity, also called permeability, is defined as the how much water can flow inside the soil voids.
Factor affecting the permeability:
1. It depends on size of pores in soil mass as such on increasing the pore size friction losses will be less and hence, water can flow easily inside the soil. So, coarse sand has higher void size and hence, higher the permeability then that of fine sand.
2. Specific surface area: Higher the specific surface area, more will be the friction so water will not flow easily and hence, low will be the permeability.
3. Void ratio: Higher the void ratio, higher will be the permeability.
4. Fluid properties: It is inversely related to dynamic viscosity of fluid being flowed inside the soil and is directly related to unit weight of fluid.
6. Degree of Saturation: It is directly related to degree of saturation of soil i.e. higher the saturation, higher will be permeability.
7. Entrapped gasses: It is inversely proportional yo entrapped gasses i.e. more quantity of entrapped gasses reduces its permeability.
8. Adsorbed Water: Higher the presence of adsorbed water, lower will be permeability because lower the area is available to flow the fluid.
9. Foreign impurities: Higher the impurities lower will be the permeability because foreign substance causes obstruction in flow of water inside soil.
