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More than 30years groundwater overdraft had resulted in hydraulic head declined from near the ground surface to 85m deep in the second confined aquifer (CA2) in Changzhou, and lead to regional land subsidence from 1970's to early 2000's. After banning deep groundwater extraction was banned in 2000, the hydraulic head of CA2 had recovered to 37.6m in Changzhou by the end of 2013. Based on several stages...
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