Using satellite data, NASA has determined it will take 11 trillion gallons of water for California to recover from its drought — about 1.5 times the maximum volume of the largest reservoir in the United States.Analysis: 11 trillion gallons of water needed to replenish California drought losses: http://t.co/k32OealMnq #AGU14 pic.twitter.com/RHYuw826On— NASA (@NASA) December 16, 2014The data came from NASA's Gravity Recovery and Climate Experiment (GRACE) satellites, and is the first ever calculation of the volume of water needed to end a drought.