Severe storms not enough to recharge California's groundwater

SAN JOAQUIN COUNTY - The severe winter storms have pulled parts of California out of the drought, but while reservoirs are refilled, the state's groundwater is still running dry. 

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This is news? I remember reading about 20 years ago that it takes something like 30 years for rainwater to filter down to the water table.

Of course back then I probably read that on the MSM so there's no telling how much truth there was to that statement, but common sense will tell you that it's not an overnight thing.