Some cities are putting water back into the ground, a process called managed aquifer recharge, to stabilize land subsidence.
Groundwater has historically been a lifeline in California’s Coachella Valley. Water for farming, for your home and community? It came from under your feet, but the extractions didn’t go unnoticed. Much like taking air out of balloon, the ground began sinking.From 1995 to 2010, parts of the valley fell by as much 0.6 meters , a process called land subsidence. The ground became destabilized, creating large cracks in the earth. Uneven sinking damaged the foundations of buildings and roads.
Across the world, excessive groundwater pumping is one of the main culprits causing cities to lose ground. Some communities that only experience a millimeter or so of sinking may not notice drastic changes, but communities subsiding at higher rates face increased flooding along the coast and damages to structures. By 2024,
“Unless you have damage from subsidence, then there is the ‘What problem is there to fix?’ kind of thing,” said Sneed. “There hasn’t really been the impetus to [address subsidence] … but more are.”Fixing land subsidence doesn’t have a simple solution. Well, unless you stop pumping groundwater. But most of the time not using groundwater isn’t feasible for communities that need to supply water to a large amount of residents.
To understand how it works, we must first learn how groundwater is stored and extracted. The ground hasof various types of sediments. An aquifer, which can appear near the surface or very deep down, is a body of rock or sediments that has a lot of porous space between the grains. These empty spaces are well-connected, much like a kitchen sponge. Aquifers can accommodate water and also allow water to flow easily through it.
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