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SES - NSW State Emergency Service NSW Government - Office of Environment and Heritage

NSW Flood Data Portal

Floodplain Risk Management Plan

Minnegang Creek Floodplain Risk Management Plan

EXECUTIVE SUMMARY

INTRODUCTION

Wollongong City Council commissioned Kellogg Brown & Root Pty Ltd (KBR), formerly
Kinhill Pty Ltd, to undertake preparation of a draft Floodplain Risk Management Plan (FRMP) for the Minnegang Creek catchment, which is located approximately nine kilometres south of Wollongong on the northern shore of Lake Illawarra.
This draft FRMP forms the fourth stage of the overall floodplain risk management process for the Minnegang Creek catchment and follows on from the previous Flood Study and Floodplain Risk Management Study, also undertaken for Council by KBR.

THE FLOOD SITUATION

The steepness of the Minnegang Creek catchment results in flooding that is relatively well contained, and generally there is little difference between the flood extents for events of different exceedance probabilities, including the Probable Maximum Flood (PMF) event. The catchment has a fast response to rainfall, due to its small size, steep terrain and urbanised nature, with a critical storm duration in the order of two hours.
The key feature of the catchment is a lack of dedicated overland flow paths to convey flood flows through what is essentially a fully developed urban-residential catchment. The worst affected area is immediately downstream of the Barina Park detention basin where there is no overland flow path to convey flood flows spilling over the
embankment, which is predicted to occur on average at least once every five years.
Approximately 60 properties in the catchment are predicted to experience inundation for the PMF event, of which one-third would experience inundation above habitable floor level. For the 20% Annual Exceedance Probability (AEP) event, it is predicted that 35 properties would suffer yard flooding with five affected above habitable floor level.

Additional Information

Field Value
Title Minnegang Creek Floodplain Risk Management Plan
Publication Date 20 January 2004
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Wollongong City Council
Author/ Prepared by Kellogg Brown & Root Pty Ltd
Publish date 15 September 2017
Update date 20 September 2017
Place Name Lake Heights
Approval State Approved
Submitted for approval 20 September 2017
Submitted by Don Stazic
Approved 10 November 2017
Approved by ses-sysadmin
Data Comment

Report only.

Identifier 19a593fd-04f5-4f57-9460-4683d798c1d0