Just came across this interesting problem that scientists are calling “peak water”. Akin to “peak oil”, it refers to the idea that freshwater is a limited commodity that we are running fast out of. One of the interesting answers to this problem is called “water banking”. An implementation is already in place South-Western United States as the GRUSP – Granite Reef Underground Storage Project.
Incidentally, the system is also a good example of computers potentially taking over control of a resource critical to human life. The many water gates and valves are all controlled by a mouse clicks by the “water master”, who is currently a human being.