Warp-n-weft

Warp-n-weft t1_j6g00hs wrote

It is worth noting that underground water isn’t necessarily a renewable resource.

Large amounts of water can be found underground in aquifers but that water can be old. Potentially hundreds of thousands of years old, deposited during the Pleistocene and it’s impressive ice age.

We can, and do, pump ancient water out to use today. But that water may not be able to recharge. Worse is if we experience subsidence of the aquifer. By withdrawing water we shrink the size of the container (the aquifer) and it potential volume cannot be increased. In some places in California the ground has subsided due to water extraction at a rate of a foot annually.

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Warp-n-weft t1_ivfzqug wrote

California’s biggest agriculture area is mostly fed by the Sierra mountains snowpack. Warm winters where the snowpack doesn’t build up are worse for the water situation that cold winters.

Part of what made California’s agriculture so successful was that you could control how your crops got water, rather than relying on the weather to provide rain. With reservoirs silted up, dams beyond their planned limits, and consistently warmer winters the water situation isn’t as robust as it was and I can’t see it getting any better.

Edit - source is only that I lived there, no professional expertise.

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