Catchment Area: Woonona, Russell Vale, Bellambi and Corrimal
Waterways: Whartons, Collins and Farrahars Creeks, Bellambi Gully and Bellambi Lake.
This catchment has experienced a number of major floods, the most recent in August 1998 which resulted in extensive damage to both public and private property.
In March 2011 Council completed a Flood Study for this catchment area. The Floodplain Risk Management Study and Plan was then completed in June 2014. These studies were jointly funded by Council and the NSW government.
Council has recently begun a review of the 2011 Collins Creek Flood Study. Since this study was completed, a new flood estimation guide has been released and this guide aims to provide improved estimates of flood behaviour. Council also released an updated blockage policy for bridges and culverts in 2016. Additional development has also occurred and needs to be taken into account in the review. The release of these documents and changes across the catchment area has required Council to review the 2011 study to ensure it is based on the latest available knowledge and information.
The review will culminate in updated technical data relating to the nature and extent of flooding in the catchment and will provide the basis for the subsequent review of the Collins Creek Floodplain Risk Management Study and Plan . The review of the Flood Study will be overseen by a Floodplain Risk Management Committee which includes representatives from community groups and State agencies.
Further Information on the review study can be found on the Collins Creek Flood Study website.
Progress of the Study:
A review of the Flood Study  has recently begun. Information in the 2011 report may change after completion of the review.
The Floodplain Risk Management Study and Plan has been completed, and was adopted by Council in July 2014.
Information in the documents below may change on competion of the review.
Study Documents Explained:
- Flood Study: defines the nature and extent of existing flooding in the catchment area.
- Floodplain Risk Management Study: identifies measures to reduce flood risk and the impacts of flooding on the community.
- Floodplain Risk Management Plan: outlines recommended measures to best address the existing, future and continuing flood problems in the area; includes guidelines for all future developments in the area.
Implementation of mitigation works to date.
Ursula Road Scheme
Creek Floodplain Risk Management Plan recommended this scheme which comprises a
number of flood modification measures, such as the upgrade of Gordon Hutton Park flood
retarding basin, construction of a flood deflection levee on the northern bank
of Whartons Creek immediately west of Franklin Avenue and replacement of the
existing Franklin Avenue road culverts with a new bridge.
damaging flooding that occurred in the lower reaches of Whartons Creek in March
2014, the Plan also recommended the replacement of the existing 450mm diameter
drainage pipe crossing Trinity Row at the eastern end of Ursula Road with a new
1050mm diameter pipe and upgrade of the existing piped drainage system running
east along Ursula Road.
A project to
investigate this opportunity in detail and prepare concept design documentation
suitable for community consultation and progression to the potential future
detailed design phase is currently in progress.
Kells Crescent Drainage Upgrade
aims to reduce the frequency of flood waters discharging through residential
properties and the likelihood of above floor inundation from being experienced. The project is in the investigation phase,
with preliminary assessments of various options currently being undertaken.
Collins Creek Debris
seeks to construct four Debris Control
Structures (Gordon Hutton Park, Russell Vale Golf Course, Albert Street,
Brompton Rd) identified as recommended priority actions in the Floodplain Risk
Management Plan. The investigation and concept design phase (completed in June
2017) found that the debris structures will reduce the flood impacts by
allowing the drainage network to drain effectively. The cost benefit analysis
indicates that there are significant benefits to reducing economic damages to
private property as well as protecting key public assets including road and
railway embankments from potential catastrophic failure during storm events.
West Street Detention Basin
Risk Management Plan identified an opportunity to reduce the impact of flooding
on existing development downstream of West Street, Russel Vale, by constructing
a detention basin within Wollongong Coal Limited land. The basin would aim to
reduce the flooding impacts downstream of West Street.
study and concept design including community consultation began in August
Bellambi Gully Scheme
aims to prevent floodwaters from discharging through residential properties and
prevent above floor inundation being experienced by residential properties
located between the railway corridor and Gladstone Street. The proposed scheme includes:
- channel improvement works between railway
line and Holy Spirit College grounds
- upgrading existing culverts at Pioneer Road
and Gladstone Street.
study and concept design including community consultation will start early
Under the Floodplain Risk Management Plan, two properties were earmarked
for voluntary purchase. One of these properties has been purchased by