Wollongong City Catchment
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Wollongong City Catchment

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Catchment Area: Wollongong, Mangerton, Coniston, Mt St Thomas

Waterways: JJ Kelly Creek

This catchment has experienced a number of floods in the past, the most recent in March 2011 and February 2012 which resulted in minor inundation of public and private property in the lower parts of the catchment.

WMAwater were engaged to prepare a Flood Study for this catchment area.

Study Objectives:

  • The Flood Study defines the nature of the flood risk in the catchment area.
  • The Floodplain Risk Management Study identifies measures to reduce flood risk and the impacts of flooding on the community.
  • The Floodplain Risk Management Plan outlines recommended measures to best address the existing, future and continuing flood problems in the area. It includes guidelines for all future developments in the area.


Progress of the Study:

The Wollongong City Flood Study and Floodplain Risk Management Study and Plan were completed by Council in 2013 and 2015, respectively. These studies identified the flood risk within the catchment and steps to be taken to manage the flood risk.

Since these studies, Council has been exploring some of the flood mitigations measures, and new developments within the catchment and changes to the blockage policy and new national rainfall guidelines it is possible flood behaviour has changed.
 
As a result, the flood study is being reviewed. The data collection phase has been completed and the consultant is reviewing the responses.

 

Wollongong Floodplain Risk Management Study and Plan

  
  
  
Wollongong City Floodplain Risk Management Study and Plan Vol 1.pdf
  
8321 KB
Wollongong City Floodplain Risk Management Study and Plan Vol 2 Part 1A.pdf
  
9160 KB
Wollongong City Floodplain Risk Management Study and Plan Vol 2 Part 1B.pdf
  
8925 KB
Wollongong City Floodplain Risk Management Study and Plan Vol 2 Part 2.pdf
  
5750 KB

Wollongong Flood Study Report

  
  
  
Wollongong Flood Study Final - Volume 1 - Part 1.pdfWollongong Flood Study Final - Volume 1 - Part 1241 KB
Wollongong Flood Study Final - Volume 1 - Part 2.pdfWollongong Flood Study Final - Volume 1 - Part 25791 KB
Wollongong Flood Study Final - Volume 1 - Part 3.pdfWollongong Flood Study Final - Volume 1 - Part 3343 KB
Wollongong Flood Study Final - Volume 1 - Part 4 - References and appendices.pdfWollongong Flood Study Final - Volume 1 - Part 4 - References and appendices5605 KB
Wollongong Flood Study Final - Volume 2 - part 01.pdfWollongong Flood Study Final - Volume 2 - part 013775 KB
Wollongong Flood Study Final - Volume 2 - part 02.pdfWollongong Flood Study Final - Volume 2 - part 023937 KB
Wollongong Flood Study Final - Volume 2 - part 03.pdfWollongong Flood Study Final - Volume 2 - part 035505 KB
Wollongong Flood Study Final - Volume 2 - part 04.pdfWollongong Flood Study Final - Volume 2 - part 043823 KB
Wollongong Flood Study Final - Volume 2 - part 05.pdfWollongong Flood Study Final - Volume 2 - part 054295 KB
Wollongong Flood Study Final - Volume 2 - part 06.pdfWollongong Flood Study Final - Volume 2 - part 065114 KB
Wollongong Flood Study Final - Volume 2 - part 07.pdfWollongong Flood Study Final - Volume 2 - part 074055 KB
Wollongong Flood Study Final - Volume 2 - part 08.pdfWollongong Flood Study Final - Volume 2 - part 084636 KB
Wollongong Flood Study Final - Volume 2 - part 09.pdfWollongong Flood Study Final - Volume 2 - part 094544 KB
Wollongong Flood Study Final - Volume 2 - part 10.pdfWollongong Flood Study Final - Volume 2 - part 105292 KB
Wollongong Flood Study Final - Volume 2 - part 11.pdfWollongong Flood Study Final - Volume 2 - part 115629 KB
Wollongong Flood Study Final - Volume 2 - part 12.pdfWollongong Flood Study Final - Volume 2 - part 125588 KB
Wollongong Flood Study Final - Volume 2 - part 13.pdfWollongong Flood Study Final - Volume 2 - part 135527 KB
Wollongong Flood Study Final - Volume 2 - part 14.pdfWollongong Flood Study Final - Volume 2 - part 145493 KB
Wollongong Flood Study Final - Volume 2 - part 15.pdfWollongong Flood Study Final - Volume 2 - part 155365 KB
Wollongong Flood Study Final - Volume 2 - part 16.pdfWollongong Flood Study Final - Volume 2 - part 164662 KB
Wollongong Flood Study Final - Volume 2 - part 17.pdfWollongong Flood Study Final - Volume 2 - part 174843 KB
Wollongong Flood Study Final - Volume 2 - part 18.pdfWollongong Flood Study Final - Volume 2 - part 185196 KB
Wollongong Flood Study Final - Volume 2 - part 19.pdfWollongong Flood Study Final - Volume 2 - part 193974 KB
Wollongong Flood Study Final - Volume 2 - part 20.pdfWollongong Flood Study Final - Volume 2 - part 202070 KB
Wollongong Flood Study Final - Volume 2 - part 21.pdfWollongong Flood Study Final - Volume 2 - part 214119 KB
(More Documents...)

​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.

Wollongong City planning matrix

A planning matrix for Wollongong City catchment has been adopted by Council. The planning matrix can be found in the Wollongong City Floodplain Risk Management Study and Plan Vol 1. The matrix considers the range of land uses, and the potential risk to flooding, within the floodplain up to the level of the probable maximum flood. Using this approach, a matrix of development controls, based on the flood exposure and the land use, has been developed that balances the risk of exposure across the floodplain.
 
If you are developing in this catchment, you will need to refer to this matrix to ensure that Council’s requirements with respect to floodplain management are understood and met.
 

Implementation of Mitigation Works to Date

Swan Street Culvert upgrade

Status: Design and construction of these works have been completed.
 
The Swan St culverts located near Kembla St have been upgraded to improve ease of maintenance to reduce the likelihood of blockage and therefore to increase operational capacity.

Additional Stormwater Inlet to reduce blockage potential and increase drainage capacity at Vale Street and Gladstone Ave

Status: Design and works for this project are identified ($100,000) in Council’s capital work program with construction to occur very soon.
 
A detailed design has been completed for this project.

Lowering of Gurungaty Causeway

Status: The feasibility study for this option is complete. Council is now into the detailed design phase which includes a conmprehensive review of environmental factors and talks with the land owners, NSW Ports.

JJ Kelly Park Landform modification

Status: Design and works for this project are identified ($2,200,000) in Council’s capital work program with construction to occur subject to feasibility and viability in 2020/21.
 
A feasibility study for works in JJ Kelly Park is scheduled to start 2017/2018. Like the Gurungaty waterway lowering, there are significant environmental issues. It is known that there are acid sulphate soils in this location and the site was also was an old rubbish tip with potential for it to be contaminated with asbestos and other building materials. The feasibility study will look at all these issues and determine if this option is viable. There may be other options such as extending existing swales up to Swan Street and removing kerb and gutter just west of the roundabout at Kembla Street. These options would have less environmental constraints and may be more viable. They will be investigated as part of the feasibility study. Such options will help in the smallest of storm events, but the benefit in significant storms is minimal.
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