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It's my understanding that there's no meaningful way we can recharge the aquifers: > Aquifers hold water in between bits of sand, gravel, or clay. When the amo
by MrDrMcCoy 2y ago
It's my understanding that there's no meaningful way we can recharge the aquifers:
> Aquifers hold water in between bits of sand, gravel, or clay. When the amount of clay in an aquifer is particularly high, the grains arrange themselves like plates thrown haphazardly in a sink—they’ve basically got random orientations, and the water fills in the spaces between the grains. But if you start extracting water from an aquifer, those spaces collapse and the grains draw closer together. “Those plates rearrange themselves into more like a stack of dinner plates that you put in your cupboard,” says Sneed. “It takes a lot less space, obviously, to stack the plates that way. And so that's the compaction of the aquifer system that then results in land subsidence at the surface.”
>
> But wouldn’t pumping more water back into the aquifer force the clay plates back to their random, spacey orientations? Unfortunately, no. “It'll press those grains apart a little bit—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,” says Sneed. We’re talking maybe three quarters of an inch of movement. “They're still stacked like the plates in your cupboard,” she continues.
https://www.wired.com/story/the-ongoing-collapse-of-the-worlds-aquifers/ https://www.wired.com/story/the-ongoing-collapse-of-the-worl...
- anonymouskimmer 2y agoYeah, you'd preferably want to recharge it before the land subsides. But even if you don't it's best to try to maintain the current levels than let them decrease even more.
- mturmon 2y agoThis is an important point, and true insofar as it goes (because the discussion you quote is about clay). But not all aquifers are clay. The ones that are composed of coarser material are more stable. Like a lot of Earth science, it's complicated. But, yes, once clay has compacted, it's not reversible and that natural storage space has been lost.