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Santa Clara valley aquifer
The Santa Clara valley aquifer is a groundwater aquifer located in the southern San Francisco Bay Area. The geology of the Santa Clara valley aquifer consists of a complex stratigraphy of permeable and impermeable units. Management of aquifer resources is associated with the Santa Clara Valley Water District.
==History==
The first half of the 20th century saw groundwater extraction increase with the increasing regional population of the Bay Area. Between 1912 and 1966 artesian pressure levels dropped by as much as . The decreasing pressure heads resulted in land subsidence of up to . Recent work has shown that refined management practices have halted land subsidence.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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