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Flood study

Review of Towradgi Creek Flood Study


Final report for the Review of Towradgi Creek Flood Study. The report covers the data collection process, community consultation, development of computer models, establishment of design flood behaviour and flood mapping.


The review of Towradgi Creek Flood Study has been prepared for Wollongong City Council (Council) to define the existing flood behaviour in the Towradgi Creek study area and consider the influence of potential climate change on future flood behaviour. The review updates the previous Towradgi Creek Flood Study (Bewsher Consulting Pty Ltd., 2003a), to account for the various recent changes within the catchment and take advantage of innovations and improvements in computer flood modelling. The study provides a holistic assessment of historic, current and future flood risk and establishes the basis for the subsequent Floodplain Risk Management Study and Plan. Flood risk has been assessed through the establishment of appropriate numerical models. The study has produced information on flood flows, velocities, levels and extents for a range of flood event magnitudes under existing catchment and floodplain conditions and considering the influence of potential climate change on future flood behaviour. Specifically, the study incorporates:

  • Compilation and review of existing information pertinent to the study, and acquisition of additional data including survey as required;
  • A community consultation and participation program to identify local flooding concerns, collect information on historical flood behaviour and engage the community in the on-going floodplain management process;
  • Development and calibration of appropriate hydrologic and hydraulic models;
  • Determination of design flood conditions for a range of design events - including the 20% Annual Exceedance Probability (AEP), 10% AEP, 5% AEP, 2% AEP, 1% AEP, 0.5% AEP, 0.2% AEP and Probable Maximum Flood (PMF);
  • Examination of potential impact of climate change using the latest guidelines for the 1% AEP design event; and
  • Presentation of study methodology, results and findings in a comprehensive report incorporating detailed flood mapping.

Additional Information

Field Value
Title Review of Towradgi Creek Flood Study
Publication Date 1 February 2015
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Wollongong City Council
Author/ Prepared by BMT WBM
Publish date 6 July 2017
Update date 15 November 2017
Place Name Towradgie Creek
Approval State Approved
Submitted for approval 7 July 2017
Submitted by Jamin Hudson
Approved 27 July 2017
Approved by plattns
Data Comment

Report only; no other data.

Identifier 54bf78cb-147f-4b54-85cf-c7fad7b73898