LA itself uses over 500,000 gallons per day or something IIRC. Also anyone who thinks that method is reasonable or would work is shortsighted. So we bottle up all the ramining water in the air of a farm to pour into the ground, where it then evaporates into the air... The cost, in water, of building such collection systems. The cost of transport etc. etc. etc.
You're creating a bigger problem of variety Y to solve a smaller problem of variety Y. They live next door to 352 quintillion gallons of water.
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