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Skip Navigation LinksHome | Services & Projects | Environmental Sustainability | Floodplain Management | Allans Creek Catchment
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Allans Creek Catchment 
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This catchment has experienced a number of major floods, the most recent in August 1998 and October 1999 which resulted in extensive damage to both public and private property

Catchment area: Mount Keira, West Wollongong, Figtree, Mount Kembla, Unanderra, Farmborough Heights and Berkeley

Waterways: Allans, Byarong, American, Branch, Brandy and Water, Charcoal, Nudjia and Jenkins Creeks

This catchment has experienced a number of major floods, the most recent in August 1998 and October 1999 which resulted in extensive damage to both public and private property.

Cardno Lawson Treloar Pty Ltd was engaged to prepare a Flood Study, Floodplain Risk Management Study and Floodplain Risk Management Plan for this catchment area. These studies were completed in September 2006.

Study documents explained:

  • Flood Study: defines the nature of the flood risk 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: explains what measures we have implemented so far

These studies were jointly funded by Council and the NSW State Government.

Documents

Allans Creek Catchment Map.pdfAllans Creek Catchment Map907 KB
Allans Creek Flood Study Report.pdfAllans Creek Flood Study Report1187 KB
Allans Creek Flood Study Figures Part 1.pdfAllans Creek Flood Study Figures Part 19573 KB
Allans Creek Flood Study Figures Part 2.pdfAllans Creek Flood Study Figures Part 27299 KB
Allans Creek Flood Study Appendices.pdfAllans Creek Flood Study Appendices1559 KB
Allans Creek Floodplain Risk Management Study Report.pdfAllans Creek Floodplain Risk Management Study Report1233 KB
Allans Creek Floodplain Risk Management Study Figures - Part 1.pdfAllans Creek Floodplain Risk Management Study Figures - Part 110519 KB
Allans Creek Floodplain Risk Management Study - Figures - Part 2.pdfAllans Creek Floodplain Risk Management Study - Figures - Part 28910 KB
Allans Creek Floodplain Risk Management Study Appendices.pdfAllans Creek Floodplain Risk Management Study Appendices2337 KB
Allans Creek Floodplain Risk Management Plan Report.pdfAllans Creek Floodplain Risk Management Plan Report2254 KB
Allens Creek Floodplain Risk Management Plan.pdfAllens Creek Floodplain Risk Management Plan311 KB
Allans Creek Flood Study Addendum 1 Part 1.pdfAllans Creek Flood Study Addendum 1 Part 19905 KB
Allans Creek Flood Study Addendum 1 Part 2.pdfAllans Creek Flood Study Addendum 1 Part 24991 KB
Allans Creek Flood Study Addendum 2 Darragh Drive Flood Study Report Part 1.pdfAllans Creek Flood Study Addendum 2 Darragh Drive Flood Study Report Part 110565 KB
Allans Creek Flood Study Addendum 2 Darragh Drive Flood Study Report Part 2.pdfAllans Creek Flood Study Addendum 2 Darragh Drive Flood Study Report Part 28557 KB
Allans Creek Flood Study Addendum 2 Darragh Drive Flood Study Report Part 3.pdfAllans Creek Flood Study Addendum 2 Darragh Drive Flood Study Report Part 37414 KB
Allans Creek Flood Study Addendum 2 Darragh Drive Flood Study Report Part 4.pdfAllans Creek Flood Study Addendum 2 Darragh Drive Flood Study Report Part 44491 KB

Implementation of Mitigation Works to Date

Removal of a Portion of the F6 Median Strip

A large vegetated earth mound forms the median strip of the F6 Freeway in the Figtree area. The removal of this median mound for the entire length of overtopping will allow for flood flows to pass the Freeway with less restriction and hence reduce flood risk upstream of the Freeway.

The removal of this median mound was completed by the Roads and Traffic Authority in 2005.

Upper Byarong Creek Scheme - Investigation and Concept Design

The main objective of this project is to assess and design a number of concept flood mitigation options that were identified in the Allans Creek Floodplain Risk Management Study and Plan (Cardno Lawson Treloar, 2006) and recommend the suitable concept options to reduce the effects of flooding on the community and development within the upper Byarong Creek catchment.

The recommended flood mitigation options (known as the upper Byarong Creek scheme) comprise:

  • The installation of debris control structure upstream of Koloona Avenue
  • Creek works upstream of Koloona Avenue
  • Contouring park on the left bank upstream of Koloona Avenue to form an offline dry detention area
  • Ring levee in the vicinity of Casuarina and Whelan/Coronata intersection
  • Flood storage area immediately upstream of Koloona Avenue following voluntary purchase of property
  • Flood storage area immediately downstream of Koloona Avenue following voluntary purchase of
    property
  • Flood storage area in the vicinity of Casuarina Place and Eureka street.


The investigation and concept design works have been completed. Of all the above recommended options, the installation of debris control structure upstream of Koloona Avenue ranked the most highly. The report has recommended this option to be implemented. Council continuously seeks funding for the detailed design works of this option.

Voluntary Purchase

Under the Allans Creek Floodplain Risk Management Plan (FRMP), 18 properties were earmarked for voluntary purchase. To date one property on Princes Highway, Figtree, adjacent to Byarong Creek, one property on the Avenue, Figtree, and another property on Koloona Avenue, Figtree , have been purchased and demolished by Council.

The implementation of further work is dependent on the Federal and State Governments' funding.

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WOLLONGONG CITY COUNCIL ▪ Address: Wollongong City Council, 41 Burelli Street, Wollongong NSW 2500 ▪ Postal: Locked Bag 8821 Wollongong DC NSW 2500
▪ Phone: (02) 4227 7111 ▪ Fax: (02) 4227 7277 ▪ Email: council@wollongong.nsw.gov.au
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