There's plenty of space in the Brisbane river valley for more Dams. One was planned about 15 years back, the land was purchased and it was ready to go. One po

There's plenty of space in the Brisbane river valley for more Dams. One was planned about 15 years back, the land was purchased and it was ready to go. One political group campaigned on having it scrapped so the land was sold off. The largest Dam servicing Brisbane has a total capacity of 220% - that being 100% is the 'normal' water storage level, the rest is for flood mitigation. So the Dam can temporarily hold more than double its usual capacity. Elsewhere in this topic you'll see people discussing whether that flood mitigation capacity was used correctly, and only time and investigation will tell. I would assume any new Dams planned would also incorporate a flood mitigation feature, particularly after this last flood. The population density outside of Brisbane drops very low, very quickly. It's nothing like the Netherlands. Australia has one of the lowest population densities in the world, whereas I think the Netherlands has one of the highest.