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United States total 
- High Plains aquifer 
If! I 5? Gull Coastal Plain 
. . 
:5 Central Valley, California 
E. 15 am Western alluuial basins 
. 1: E, - Agricultural and land drainage -  
Western volcanic systems 
4m Con?ned bedrock aquifers 
I: 3 Mantis CoestalPlain ledge
IL I - lees
 200: 
as 
e- a 
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1900 1920 me 1960 19m 2000 {if
I Year 

Figure 56. Cumulative groundwater depletion in the United 1
States and major aquifer systems or categories, 1900 through 2008 NW
{modi?ed from Konikow, 2011}. ii.