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Flood inundation maps

Flood inundation maps were created for flood response planning, infrastructure design and environmental management. The maps show the area of surface flooding for 5 year, 10 year, 20 year, 50 year and 100 year return periods based on modeling completed in 2015.

To view the 2015 flood inundation maps visit City Online:

  • Click on the Cityonline Map Viewer
  • Double Click +Open Data Catalogue
  • Make sure the boxes are checked beside both Cityonline Maps and Open Data Catalogue
  • Scroll down and double click on the inundation map you wish to view
    • 5 Year Flood Inundation Model 2015
    • 10 Year Flood Inundation Model 2015
    • 20 Year Flood Inundation Model 2015
    • 50 Year Flood Inundation Model 2015
    • 100 Year Flood Inundation Model 2015

The 2015 flood inundation maps are also available in the documents below:

Three distinct areas are identified in the inundation maps

Flood inundation maps

Flood inundation extent
Area flooded due to the river that has breached its banks (riverbank over-topping).

Low lying areas not wet from riverbank over-topping but may have groundwater seepage or storm water backup.

Potential flood control structure failure
Low lying areas that could be flooded if an existing permanent flood protection barrier were to fail.