California needs 11 trillion gallons of water: NASA

California needs 11 trillion gallons of water to recover from its three-year drought, the US space agency said Tuesday after studying water resources by using satellite data. The more than 40-trillion-liter volume is a huge quantity of water, larger, for example, than the total amount held behind China's historic Three Gorges Dam. The entire southwestern United States is far drier than normal, with groundwater levels across the region in the lowest two to 10 percent since 1949, scientists said. Meanwhile, other NASA satellite data showed that so far this year, the snowpack in California's Sierra Nevada range is only half previous estimates...more