How does Council manage flood risk?
- Emergency response plans based on detailed understanding of flood behaviour
- Building new structures that collect and carry stormwater into drains or creeks, such as detention basins and swales, or improving existing ones to better manage stormwater and floods
- Land zoning that says what can and can’t be built on flood-prone land
- Voluntary purchase of houses built in high flood risk areas
Why do flood levels need to be reviewed over time?
- New floods occur, providing additional data to fine-tune the model
- More advanced computer models or methods for estimating flood levels become available
- Changes in the catchment, such as flood mitigation works or new developments
- Changes in policy (such as Council's culvert Blockage Policy)
How are flood affected properties identified?
Where can I get information about flood levels on my property?
What has changed in the updated Wollongong City Flood Study?
- We’ve considered Council's revised Blockage Policy
- We have improved information, such as recent data from land and waterway surveying
- The new flood model was checked against the June 2016 and March 2017 events and was able to produce the same flood levels recorded by the community
- The pedestrian bridge across the waterway is modelled as being partly blocked, in line with the updated Blockage Policy
- We’ve considered the upcoming lowering of the Gurungaty causeway
- The increase in mangrove growth over the last 10 years has been included
What does the Study say about flooding in South Wollongong?
- There has been an increase in intense rainfalls that are causing the floods
- The changes in Gurungaty waterway have only minor impacts
- The volume of wet weather sewer overflows is relatively small and results from stormwater flows from within the catchment. Wet weather sewer overflows are not considered to be a contributing factor to the flooding issues at Swan Street and adjoining streets.
- Sea levels can impact on flooding in the area, as stormwater takes longer to drain out to sea from low-lying coastal areas in high tides
- New developments do not increase flows to this area
What other flood mitigation work is Council doing in this catchment?