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Flood study

Birds Gully and Bunnerong Road Flood Study

This flood study was prepared by WMAwater on behalf of the Randwick City Council and Bayside Council. The study was commissioned by the Randwick City Council and Bayside Council with funding from the NSW Office of Environment and Heritage (OEH) under the Floodplain Management Program. The main objective of the study is to define existing flood behaviour within the Birds Gully and Bunnerong Road catchment. The study examined past flood events that have occurred, in addition to undertaking a flood assessment for a range of design storms.

The scope of this flood study is to develop a robust hydrologic and hydraulic modelling package with the capability to accurately simulate existing and historic flood behaviour. Given a history of flooding within the catchment, there is a strong need to define and map flood behaviour in the catchment in order to provide Council with the planning tools necessary to mitigate flood risk for current and future development. The information and results obtained from this study will provide the basis for the development of a subsequent Floodplain Risk Management Study and Plan (FRMS&P) which will explore flood modification works, various planning instruments and flood response measures. Flood study elements undertaken as part of this study include:

  • Undertake a community consultation program,
  • Develop a hydrologic and hydraulic modelling package to appropriately represent the catchment and floodplain,
  • Validate the hydrologic and hydraulic models against historical events,
  • Determine the sensitivity of the model outcomes to modelling parameters and assumptions,
  • Define flood characteristics including flood extent, levels, depths, velocities and flows,
  • Determine floodplain planning categories including, hydraulic categories, hazard categories and the flood emergency response classification,
  • Define the capacity of the existing drainage network and determine potential upgrades, and
  • Undertake a climate change assessment including assessing the effects of an increase in different rainfall intensities.

Additional Information

Field Value
Title Birds Gully and Bunnerong Road Flood Study
Publication Date 21 June 2018
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Randwick City Council
Author/ Prepared by WMAwater
Publish date 5 June 2020
Update date 5 June 2020
River Basin 213 - Georges
Approval State Approved
Submitted for approval 5 June 2020
Submitted by Akhil Sud
Approved 9 June 2020
Approved by dstazic
Identifier dded71d3-4961-432c-8306-97092d1e84ac