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Gwawley Bay Catchment Flood Study

Created 11/01/2026

Updated 02/03/2026

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The study investigates flood behaviour throughout the Gwawley Bay catchment. This includes the analysis of:

  1. surface runoff across the catchment
  2. flows within the underground pipe drainage network
  3. flooding within Gwawley Creek and other watercourses towards the lower part of the catchment; and
  4. backwater flooding in Gwawley Bay from the Georges River.

A two-dimensional computer model was established for the catchment to analyse flood behaviour under existing catchment conditions. The model provides information on the extent of flood inundation, flood depths and flood velocities throughout the catchment for design floods ranging from relatively frequent events to more extreme floods.

Outcomes from the Study

Outcomes from this study include:

  1. a database of all drainage assets within the study area;
  2. establishment of computer models capable of assessing flood behaviour;
  3. information on flood behaviour under existing catchment conditions; and
  4. a model that can be used to assess flood mitigation options and future development proposals.

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Additional Info

Field Value
Title Gwawley Bay Catchment Flood Study
Language English
Licence Creative Commons Attribution 3.0 Australia
Landing Page https://data.gov.au/data/en/dataset/d5519fb3-95b7-4580-aada-3e57af209f48
Remote Last Updated 20/01/2026
Contact Point
Sutherland Shire Council
ssc@ssc.nsw.gov.au
Reference Period 17/12/2025 - 01/11/2012
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    147.0179,
    -32.1618
  ],
  "type": "Point"
}
Data Portal DataNSW

Data Source

This dataset was originally found on DataNSW "Gwawley Bay Catchment Flood Study". Please visit the source to access the original metadata of the dataset:
https://data.nsw.gov.au/data/dataset/nsw-fdp-gwawley-bay-catchment-flood-study-report