Flooding within the Hawkesbury-Nepean River floodplain is complex, due to its large catchment area and confined sandstone gorges that serve as “choke points” resulting in large differences in flood levels between events.
An update to the Hawkesbury-Nepean Flood Study has been in development since 2020. As one of the largest flood studies currently being undertaken in NSW, it uses state of the art technical approaches to define the flood risk throughout the floodplain and builds upon the 2019 Hawkesbury-Nepean Regional Flood Study.








