Capillarity Of Soil

Capillarity of soils

·        At the time of rainfall, because of gravity the rain water percolates into the ground

·        And starts stored in the form of the ground reservoir in the soil pores over impervious stratum

·        Upper surface of the zone of full saturation of the soil is known as the water table

·        Atmospheric pressure is subjected at the water table  

Definition:-

Because of gravity force, the percolating water should go on downward and the soil above the water table should be completely dry, but it is not happening because at some height above the water table the soil is completely saturated, So this phenomenon of rising water is known as capillarity of soil.

zones of soil water

1.     Zone-1 (submerged zone)

·        This exist below the ground water table

·        Soil in this zone is in submerged condition

·        Pore pressure is hydrostatic

2.     Zone-2 (capillarity zone)

·        Soil in this zone is completely saturated upto some height above the water table

3.     Zone-3 (zone of aeration)

·        exist at the some height above the capillarity zone

·        In this zone, soil is able to retain small water droplets, surrounded on all sides by air

·        This water is known as contact moisture or hygroscopic water

·        This contact moisture retained by the soil against the gravity drainage 

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