The Drought Apocalypse Approaches As The Colorado River Basin Dries Up

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jhendrix
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The Drought Apocalypse Approaches As The Colorado River Basin Dries Up
2 months ago

Article:

The Drought Apocalypse Approaches As The Colorado River Basin Dries Up

"Scientists on Thursday released the results of a first-of-its-kind study that finds the seven states of the drought-stricken Colorado River Basin are depleting groundwater reserves at a rapid rate. That threatens the future of a river that supplies water to 40 million people and irrigates 4 million acres of farmland.

"Scientists at the University of California, Irvine, and NASA analyzed data from a satellite that measures underground water reserves to calculate that the Colorado River Basin has lost 65 cubic kilometers—that’s 17.3 trillion gallons—of water between December 2004 and November 2013. That represents twice the capacity of the United States’ largest reservoir, Lake Mead in Nevada. Most worrying, 75 percent of the loss came from groundwater supplies.

"So what to do? First, fill in the data gap to figure out exactly how much water is left so decisions can be made about its management for the future. That’s where the satellite program called Gravity Recovery and Climate Experiment comes in. The satellite measures tiny changes in an area’s gravitational pull to determine its groundwater capacity."

http://news.yahoo.com/drought-apocalypse-approaches-colorado-river-basin-dries-221214264.html

"The satellite measures tiny changes in an area’s gravitational pull to determine its groundwater capacity."

Maybe someone can explain the above quote.  Not getting how satellite data can determine groundwater capacity.

Even if they can determine gravitational pull, how can they determine the size of the underground reservoir?

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