Updating Mapping for Wollondilly Flood Study

Adopted - May 2026

Wollondilly Shire Council has now adopted the Wollondilly Flood Study.

A flood study is an important step towards developing a Flood Risk Management Study and Plan. A Flood Risk Management Plan establishes the best actions Council can undertake to improve the situation and to help reduce the worst effects of flooding – whether overland flooding or mainstream flooding. Before we start the Flood Risk Management Plan, we need accurate mapping.

In 2024 we checked in to see if the draft mapping aligned with people’s observations and lived experience. Thank you to everyone who provided feedback – it has helped to verify and adjust our mapping.

Check Council’s web site for the details of the final flood study and mapping.

Consultation

Two previous consultations helped with drafting the flood mapping. During our most recent consultation period in 2024, we asked to hear feedback about whether our draft mapping matched community observations and understanding of flooding and water flow in local areas, especially in relation to the 1 in 10 chance flood mapping.

We collected a large amount of feedback from the Your Say Wollondilly feedback form, the interactive map, phone calls, emails, and conversations at our drop-in sessions. Thanks to everyone who provided feedback – it has helped to verify and adjust our mapping.

Understanding Risk Helps Manage Risk

The process of doing a flood study helps Council and the community understand flood risk. It’s important to note that the study assesses existing flood risk. It doesn’t change a property’s flood risk – it evaluates existing risk.

All Councils in NSW are undertaking flood studies and flood risk management plans to fulfil NSW Government requirements under the NSW Flood Prone Land Policy. Council engaged consultants Worley Consulting (previously called Advisian) to carry out the Flood Study.