Gympie gets it water from the Mary R. Borumba releases to maintain a flow in the Mary primarily for the downstream irrigation and also to top up urban supply to the Mary R towns, although this is really only for the town as everyone has tanks outside (and most in town).
Re the nuclear power station. I have seen this reported before, but am interested in how it would work as I believe most of the property owners who sold to QWI have a buy back option if the dam doesn't go ahead.