>>1066688It isn't illegal in the USA. It might be illegal in some drought laden over populated wasteland because then the rainwater cannot recharge the groundwater stores but fuck that level of over-apportionment. I can find no case law regarding the allocation of precipitation, buy it may be buried deep in state CoA rulings. SCOTUS has ruled that water law is states perogative, but if this is for reals, is a scotus case waiting for a well heeled plaintiff. I love my riparian water rights.