Land Subsidence In The 1970s

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In the 1970s when the last complete surveys of land subsidence were made, subsidence in surplus of one foot which had affected more than 5,200 square miles of irrigable land (one half the entire San Joaquin Valley). Land subsidence has continued and has slowed down since the 1970s because of reduction of ground water levels able to be done so by supplemental use of surface water for irrigation.

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