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Tehran’s New Challenge: Land Subsidence

The main reason of land subsidence in Iran is injudicious groundwater extraction that has been causing serious concern among conservationists, environmental/economic experts and academia
Tehran’s New Challenge: Land SubsidenceTehran’s New Challenge: Land Subsidence

The earth sinks in some plains in Tehran Province by about 0.5 to 1 millimeter every day, and conditions are more critical in Shahriar and Varamin counties in southwest and south Tehran, managing director of Tehran Regional Water Company said.
“An annual 31 centimeters of land subsidence is reported in Tehran Province. Over three billion cubic meters of water is extracted from groundwater sources in the capital every year,” ILNA quoted Hassan Razavi as saying.
Land subsidence is defined by scientific references as a gradual settling or sudden sinking of the earth's surface owing to subsurface movement of earth materials. 
Principal causes are aquifer-system compaction, drainage of organic soils, underground mining, hydrocompaction, gas and oil extraction as well as earthquake.  

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