Collins Creek Catchment
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Collins Creek Catchment

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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 [2014]. 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 [2011] 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. 


 

 

 Flood Study Report [2011]

 
  
  
  
Flood Study Report - Volume 1 - Appendix A.pdf
  
70 KB
Flood Study Report - Volume 1 - Appendix B.pdf
  
6433 KB
Flood Study Report - Volume 1 - Appendix C.pdf
  
115 KB
Flood Study Report - Volume 1 - Appendix D.pdf
  
38 KB
Flood Study Report - Volume 1 - Appendix E.pdf
  
154 KB
Flood Study Report - Volume 1 - Executive Summary.pdf
  
6897 KB
Flood Study Report - Volume 1 - Part 1.pdf
  
8033 KB
Flood Study Report - Volume 1 - Part 2.pdf
  
9130 KB
Flood Study Report - Volume 1 - Part 3.pdf
  
5730 KB
Flood Study Report - Volume 2 - Figure A2.2 - Figure C2.2.pdf
  
10005 KB
Flood Study Report - Volume 2 - Figure C2.3 - Figure C4.3.pdf
  
9353 KB
Flood Study Report - Volume 2 - Figure C4.11 - Figure E2.1.pdf
  
9597 KB
Flood Study Report - Volume 2 - Figure C4.4 - Figure C4.10.pdf
  
9683 KB
Flood Study Report - Volume 2 - Figure E2.2 - Figure E3.4.pdf
  
10595 KB
Flood Study Report - Volume 2 - Figure E3.11 - Figure E3.15.pdf
  
9255 KB
Flood Study Report - Volume 2 - Figure E3.16 - Figure E3.20.pdf
  
9703 KB
Flood Study Report - Volume 2 - Figure E3.21 - Figure E4.1.pdf
  
9857 KB
Flood Study Report - Volume 2 - Figure E3.5 - Figure E3.10.pdf
  
9967 KB
Flood Study Report - Volume 2 - Figure E4.2 - Figure E4.7.pdf
  
9115 KB
Flood Study Report - Volume 2 - Figure E4.8 - Figure E5.1.pdf
  
8761 KB
Flood Study Report - Volume 2 - Figure E5.2 - Figure E5.7.pdf
  
9046 KB
Flood Study Report - Volume 2 - Figure E5.8 - Figure E5.12.pdf
  
8753 KB
Flood Study Report - Volume 2 - Figures A1.1 - Figure A2.1.pdf
  
10141 KB
Flood Study Report - Volume 2 - Figures from Appendices.pdf
  
136 KB

 

 

 Floodplain Risk Management Study and Plan [2014]

 
  
  
  
Combined Catchments - Volume 1 - Main Report and Appendices.pdf
  
11634 KB
Pages from Combined Catchments - Volume 2 - Part 1 of 7.pdf
  
9283 KB
Pages from Combined Catchments - Volume 2 - Part 2 of 7.pdf
  
14391 KB
Pages from Combined Catchments - Volume 2 - Part 3 of 7.pdf
  
9467 KB
Pages from Combined Catchments - Volume 2 - Part 4 of 7.pdf
  
8632 KB
Pages from Combined Catchments - Volume 2 - Part 5 of 7.pdf
  
11276 KB
Pages from Combined Catchments - Volume 2 - Part 6 of 7.pdf
  
11448 KB
Pages from Combined Catchments - Volume 2 - Part 7 of 7.pdf
  
10494 KB

 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

The Collins 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.

Following the 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 

This project 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 Control Structures

This project 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

The Floodplain 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.

A feasibility study and concept design including community consultation began in August 2017.

Bellambi Gully Scheme

This project 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.

 A feasibility study and concept design including community consultation will start early 2018.

Voluntary Purchase

Under the Floodplain Risk Management Plan, two properties were earmarked for voluntary purchase.  One of these properties has been purchased by Council.

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