As for Caboolture River, I think that dredging a 3m deep channel through bakers flats would do a world of good to the river.
I think the jew and threadies don't particularly like crossing quite shallow waters and would prefer a deeper channel.
Population growth however is going to kill SEQ in the next 3 decades.
I think I might relocate to Mourylian Harbour when I retire....deal with the cyclones and the crocs for a decade would be better than living in SEQ for a week.