Ancient groundwater: Why the water you’re drinking may be thousands of years old

Image caption: Flow timescales of groundwater through different layers. USGS. Article by Marissa Grunes, Alan Seltzer and Kevin M. Befus. The Conversation – October 7, 2021.

Communities that rely on the Colorado River are facing a water crisis. Lake Mead, the river’s largest reservoir, has fallen to levels not seen since it was created by the construction of the Hoover Dam roughly a century ago. Arizona and Nevada are facing their first-ever mandated water cuts, while water is being released from other reservoirs to keep the Colorado River’s hydropower plants running. […]

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