May be of interest;

60 Minutes episode last evening: 
Depleting the water

Additional USGS information: 

Groundwater Information pages: http://water.usgs.gov/ogw/

Groundwater Depletion: http://water.usgs.gov/edu/gwdepletion.html

Land Subsidence: http://water.usgs.gov/edu/earthgwlandsubside.html

Groundwater Depletion in the United States (1900-2008): http://pubs.usgs.gov/sir/2013/5079/

Ground Water Atlas of the United States: http://pubs.usgs.gov/ha/ha730/gwa.html

Enjoy the day,

Emily Wild
Librarian (Physical Scientist)
U.S. Geological Survey
Denver Library
Box 25046, MS 914
Denver Federal Center
Denver, CO 80225-0046
ph: (303) 236-1003
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USGS Libraries: http://library.usgs.gov
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Professional Page: http://profile.usgs.gov/ecwild