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One of the prime examples. IIRC - Go research it yourself though.
Arizona gets pretty much all of it's water from the Colorado River. Arizona has almost NO water for itself, it gets it all from the river flowing in from the north.
So, the states to the north in which the Colorado River flows through - have laws about collecting rain water. Because that rain water needs to make it's way to the river. If you had too many people collecting the water instead Arizona and the people living there would have serious serious issues.
Just go research it yourself, it's not that hard. I'll never understand why so many people go watch a youtube video and suddenly have some moronic idea about what is happening in the world. How do you get through life believing every little thing that is told to you?
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