Floods do not occur in a regular pattern. There may be a period of no floods and a period of several floods. For example, the last time the Brisbane River flooded before the 2011 disaster was in 1974. Residents who moved there in more recent times may never considered flooding an issue until the floods in January 2011. In 1949 and 1950 Kempsey experienced the two worst floods ever recorded, within eight months of each other. Following extensive rain every water course will flood.

A property where flood models show that the property is lower than the level of a 1% AEP. Even if a property hasn’t flooded before, it could still be at risk in the future.

Even though the Sydney June 2022 flood was a significant flood event, this event was much smaller (approx. 3.5% AEP) compared to 1% AEP event.