Aug 6, 2015:
Because of the drought, many farmers in California's Central Valley have been forced to get a greater percentage of water used for crop irrigation from groundwater aquifers. This has resulted in a condition know as "subsidence" (the gradual caving in or sinking of an area of land), which has caused canals to crack and roads to buckle.
Because so much water has been pumped from the aquifers, many groundwater wells have dried up because they are no longer deep enough to reach the water.
There is now high demand for water well-drilling in Central Valley and long wait times to have a new well drilled. And, because wells must be drilled so much deeper, the cost of drilling has significantly increased.
Overpumping of Central Valley groundwater creating a crisis, experts say | Los Angeles Times
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