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Flood study

Horsley Creek Floodplain Risk Management Study and Plan Final Report

Executive Summary

GHD was commissioned by Shellharbour City Council to undertake the Floodplain Risk Management Study for the Horsley Creek Catchment.

The Horsley Creek Catchment lies south of Lake Illawarra and east of Illawarra Regional Airport. The catchment covers approximately 963 ha, and is made up of the suburbs of Albion Park Rail, Oak Flats, Blackbutt and Albion Park.

Approximately half of the catchment area is urbanised, consisting of residential, commercial and industrial development. The main undeveloped region within the catchment is the area just south of the East West Link, where an existing quarry is located. Other areas with minimal infrastructure include a cemetery, some recreational parks, and an air transport facility on the western side of the catchment.

The catchment has three main waterways, one on the western side, one in the centre, and one on the eastern side. All three waterways drain in a northerly direction and meet at the downstream end and outlet to Lake Illawarra.

Horsley Creek has been subject to a number of floods in recent history, the most notable of which occurred in March 2011, causing significant property damage. A flood study for the Horsley Creek catchment was previously completed in 2011 using the WBNM hydrology model and TUFLOW flood model.

This floodplain risk management study builds on the results of the 2011 flood study. The study area was extended, and additional survey and drainage culverts were identified and added to the WBNM and TUFLOW models. The updated TUFLOW model was subsequently verified with the March 2011 flood event, prior to adopting it for design flood estimates.

A floodplain management committee was formed by Council to assist in steering the direction of the study. Members of the community were represented on this committee.

Community consultation was undertaken as part of the floodplain management process. A flood questionnaire survey was sent out to 3293 households within the catchment to inform the community of the study, gather any additional flood information available, and assist in understanding community preferences in flood mitigation options.

Additional Information

Field Value
Title Horsley Creek Floodplain Risk Management Study and Plan Final Report
River Basin 214 - Wollongong
Publication Date 1 January 2017
Themes Land and Resource Management
Spatial Extent
© OpenStreetMap contributors
Council/LGA Shellharbour City Council
Author/ Prepared by GHD
Publish date 24 August 2017
Update date 1 September 2017
Place Name Albion Park Rail
Approval State Approved
Submitted for approval 1 September 2017
Submitted by Don Stazic
Approved 1 September 2017
Approved by jhudson
Identifier 1001398c-73fd-4ebe-8370-2693a82cf920