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Articles on Groundwater

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Heavy rain from a series of atmospheric rivers flooded large parts of California from late December 2022 into early January 2023. Tayfun Coskun/Anadolu Agency via Getty Images

How California could save up its rain to ease future droughts — instead of watching epic atmospheric river rainfall drain into the Pacific

Urban infrastructure was designed to take stormwater out to the ocean quickly. Now, California needs that precious water.
Hundreds of freshwater basins across the world, including the dried-up Santa Olalla permanent freshwater lagoon, in Spain’s Doñana National Park, are the most likely to experience social and ecological impacts due to freshwater use. (Donana Biological Station/CSIC)

Ripple effect: As global freshwater basins dry up, the threat to ecosystems and communities grows

While we know how global changes in freshwater pose risks to humans and ecosystems, we know less about how people and ecosystems will respond to these global freshwater challenges.
The old village of Aceredo, submerged 30 years ago when a hydropower dam flooded the valley, emerged during a drought in northwestern Spain, in February 2022. (AP Photo/Emilio Morenatti)

IPCC report: Half the world is facing water scarcity, floods and dirty water — large investments are needed for effective solutions

Water is central to adapting to climate change, but very few of the strategies put in place to respond to water hazards or ensure its availability have been evaluated.
Groundwater is used for irrigation and drinking water, but those wells are rarely more than one kilometre deep. A huge volume of salty water exists as much as 10 kilometres below the Earth’s surface. (Shutterstock)

Groundwater — not ice sheets — is the largest source of water on land and most of it is ancient

Groundwater is the second-largest store of water on Earth. Governments and industry use groundwater reservoirs to store waste, but it may also have environmental functions that haven’t been revealed.
Some of North America’s groundwater is so old, it fell as rain before humans arrived here thousands of years ago. Maria Fuchs via Getty Images

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

As surface water diminishes in the Western US, people are drilling deeper wells – and tapping into older groundwater that can take thousands of years to replenish naturally.
In some drought-stricken parts of the Southwest, water arrives by truck. Spencer Platt/Getty Images

Avoiding water bankruptcy in the drought-troubled Southwest: What the US and Iran can learn from each other

Cities and farmers in the Southwest are resorting to unsustainable strategies to pull in more water. Iran has tried many of these strategies and shows how they can go wrong.

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