The tl;dr is that doing so can have a negative impact on people down river.
If you *didn’t* collect that rain water it would normally end up in a river when is then used by a bunch of other people. But if you collected all the rain that fell on your land those people might get basically zero water. If it’s extreme enough you could make an entire river dry up. Which is bad.
These laws are not really about us normal people that might collect a bit of rain from our roof. It’s for farmers with dozens of acres of ponds they can use to collect rain water.
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