This is a summary of sources.
More than a century of data in USGS Circular 1182 Land Subsidence in the United States http://pubs.usgs.gov/circ/circ1182/ , specifically:
- PART I–Mining Ground Water–Introduction http://pubs.usgs.gov/circ/circ1182/pdf/04part1_intro.pdf
- Santa Clara Valley, California http://pubs.usgs.gov/circ/circ1182/pdf/05SantaClaraValley.pdf
- San Joaquin Valley, California http://pubs.usgs.gov/circ/circ1182/pdf/06SanJoaquinValley.pdf
Those three files contain different information each. They are worth looking at each, all pages, even if you don’t read all details.
About 2013 activity in Stanislaus County, notable articles for numbers mentioned:
- 30 foot [10m] drop in two years, the Central Valley’s water reserves reportedly are shrinking by 800 billion gallons [3 billion m3] per year, which is enough to meet the annual needs of 22 million people http://www.modbee.com/2013/11/13/3029632/water-well-drilling-permits-soar.html
- county issued about 300 permits for new wells last year , wells were drilled that [each] could pump 1,800 to 2,500 gallons [8m3] of groundwater per minute http://www.modbee.com/2014/02/07/3176857/stanislaus-farmers-sued-over-environmental.html
- not surprisingly, applicants for Stanislaus County water advisory committee have stakes in groundwater use http://www.modbee.com/2014/01/28/3158988/most-applicants-for-stanislaus.html
Hoping this compilation will help in coming to good decisions. It has been written preemptively, to supply science and history when discussions, as regrettably too common in contemporary politics, would become too sidetracked or partisan.
Additional info re Santa Clara Valley at http://en.wikipedia.org/wiki/Santa_Clara_valley_aquifer .