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A first-of-its-kind study has found that in the next 20 years, 1.6 billion people will be affected by crumbling aquifers. Subsidence, the degradation of aquifers due to over-extraction of water and drought, causes the earth to cave in reducing aquifers’ ability to hold water and puts communities at risk of severe flooding. As conflicts around access to water increase around the world, creeping subsidence threatens to throw coastal communities into chaos.
In California’s San Joaquin Valley, the land sunk by 28 feet by 1970.
Gerardo Herrera-García, the lead author of the study, said that this sinking will not only strain water supplies but damage infrastructure and natural resources as well. “It will cause these indirect effects or impacts that, in the long term, can produce either damages to structures or infrastructure, or increase floodable areas in these river basins or coastal areas,” he said. And what’s more: subsidence is uniquely sensitive to climate change.
“No matter the amount of annual rainfall you have, the most important issue is that you have a prolonged drought period,” said Herrera-Garcia. When reservoirs run dry, cities pump more water from aquifers, creating the perfect conditions for subsidence. The western United States is currently in what experts are calling a “forever drought” increasing the risk of subsidence in states like California.
A Technical Guide: Subsidence occurs when a dry aquifer has a particularly high amount of clay. When water is sucked out of the aquifer, the layers of clay collapse on themselves, compacting the land and sinking it into the ground. Refilling an aquifer with water, won’t help much because the compacted clay won’t hold as much water as it once did. Michelle Sneed, a land subsidence specialist at the U.S. Geological Survey and co-author of the study explained, “you’ll get a little bit of expansion in the aquifer system represented as uplift on the land surface. But it’s a tiny amount.”
Stopping the Creep: Experts worry that there may be no realistic way to stop creeping subsidence. The only way to prevent aquifers from flooding is to stop over-exploitation of water resources, but as the globe warms and droughts become longer and more common, that’s easier said than done. “Aquifers will be depleted, one way or another. It’s not possible to ask people who are in need of fresh water to stop using groundwater because it causes subsidence,” said Arizona State University geophysicist Manoochehr Shirzaei. So, the bigger picture is: What are the adaptation strategies?” Solutions include elevating buildings and innovative water collection methods, but ultimately, the best way to prevent subsidence a global effort to stop rapid temperature rise and end prolonged droughts.
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