FILE - This July 23, 2015, file photo provided by the California Department of Water Resources shows the Russell Avenue bridge, over the Delta Mendota Canal in Firebaugh, Calif. The drought has caused the bridge to subside until there's almost no space between bottom of bridge decking and canal water surface. A NASA scientist says in a report released Wednesday, Aug. 19, 2015 that parts of California's Central Valley are sinking faster than ever as groundwater is being pumped during the state's historic drought. Land in the Central Valley is sinking so much from over pumping of groundwater that it's now starting to damage the state's vital north-south water project, state officials say.(Florence Low/ California Department of Water Resources via AP, File)
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