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Based on “Elizabeth Zach”.

More than half of the Colorado River originates underground

A U.S. Geological Survey shows that a little more than half of the Colorado River, the West’s primary water source, is groundwater before it seeps into the river bed. The preliminary finding may help city water supply managers anticipate future volumes amid rising temperatures and less snowfall.

Experts say there may be more ground water deep below the surface

California’s groundwater, researchers say, is more plentiful than they thought. The water had eluded them because they weren’t searching deep enough, according to an assessment published this month in the Proceedings of the National Academy of Sciences.