Extensive groundwater withdrawal from the unconsolidated deposits in the San Joaquin Valley caused widespread aquifer-system compaction and resultant land subsidence from 1926 to 1970?locally exceeding 8.5 meters. The importation of surface water beginnin
Sneed, Michelle micsneed@usgs.gov,Brandt, Justin jbrandt@usgs.gov,Solt, Mike. Land subsidence along the Delta-Mendota Canal in the northern part of the San Joaquin Valley, California, 2003-10. 2013-01-01.