Rain helps, but California needs 11 trillion gallons to get out of drought

For 12 years, NASA researchers have compiled data on water storage levels in groundwater, reservoirs and snowpack. Those levels cycle during the year – higher in winter, lower in fall – and this past fall, water storage was 11 trillion gallons below the 12-year average, an amount equal to roughly 1.5 fully stocked Lake Meads.

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