Using satellite data, UC Irvine and NASA hydrologists have found that groundwater beneath northern India has been receding by as much as 1 foot per year over the past decade – and they believe human consumption is almost entirely to blame. More than 109 cubic kilometers (26 cubic miles) of groundwater disappeared from the region’s aquifers between 2002 and 2008 – double the capacity of India’s largest surface-water reservoir, the Upper Wainganga, and triple that of Lake Mead, the largest manmade reservoir in the U.S. People are pumping northern India’s underground water, mostly to irrigate cropland, faster than natural processes can replenish it, said Jay Famiglietti and Isabella Velicogna, UCI Earth system scientists, and Matt Rodell of NASA’s Goddard Space Flight Center. Study results were published online Aug. 12 in the journal Nature.