On the Maori claim to ownership of NZ’s water:

A commenter in Stuff News has it exactly right:
Robert7125
“If they own the water surely they must guarantee a minimum and maximum flow, a guaranteed quality of water, pay for all damages caused by excess water such as floods, truck in water to users if supply is low, pay tax on all sales as they are not a charity trust, and pay rates to councils like all other land users do”