Sinkhole Formation – How sinkhole Form
Sinkhole Formation – In a first of its kind phenomenon, the sinkhole was noticed on the dried Chitravati riverbed near the Goddumarri village in this perennially drought-prone district of Andhra Pradesh. It has a depth of about 30 feet and a diameter of 25 feet
Definition: A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer.
Sinkholes may be formed gradually or suddenly, and are found worldwide.
Sinkholes usually form in soils characterized by rocks of gypsum or dolomite or limestone which melt in water available in the sub surface channels, leading to a sudden collapse.
During dry conditions, water tables drop in the limestone and cavities under the sand and clay soil. The combination of gravity, loss of buoyancy and water pressure can activate a collapse on the topsoil.
Sinkholes may vary in size from 1 to 600 m (3.3 to 2,000 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may be formed gradually or suddenly, and are found worldwide
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Human activities that leads to Sinkhole Formation
- Overexploitation of groundwater: the intensity of drawing groundwater especially near that of a river is much higher due to a string of agricultural activities
- No recharge of the water table in the absence of good rains
- Diverting surface water from a large area and concentrating it in a single point
- Artificially creating ponds of surface water and drilling new water wells