ACTGOV FLOOD EXTENT MODEL

Along with other jurisdictions in Australia, the ACT is moving toward national best practice in flood risk management. This is the most comprehensive review of Canberra’s catchments and their associated flood risk to date. A 1% Annual Exceedance Probability (AEP) flood is a flood which has a 1% chance of occurring in any year. This means that if you experienced a 1% AEP flood last year, the chance of experiencing a similar flood this year is still 1%.It used to be known as 1 in 100 year flood, but this term is misleading as it suggests such a flood will only occur once every 100 years.


See more about riverine flooding in the Australian Capital Territory.


See some frequently asked questions and answers relating to flooding.



Floodplain data on this website:

 1. Is provided for information purposes only for members of the public.
 2. Has been compiled by the Australian Capital Territory using available resources at the time of production derived from the best available modelling of the catchments and watercourses.
 3. Is subject to the uncertainties of scientific and technical research which:
   - May involve unstable and/or unpredictable variables and is therefore limited in its accuracy and applicability; and,
   - Will depend on a number of factors including, but not limited to: type of flooding, intensity, frequency and duration of rainfall experienced, time of flooding, weather factors including catchment soil moisture content, new building development and changes to or unforeseen factors associated with water management infrastructure.

 4. Does not depict real-time information about a flood.

 5. Does not provide any information about other sources of flooding, including but not limited to flooding from overland flow, the bursting of pipes or overflows from a natural or artificial lake or dam.

 6. Does not represent historical flood events which have impacted the Australian Capital Territory.



Accordingly:

 1. While the information presented on this website attempts to represent what may be experienced during a flood, actual flood events may differ substantially.

 2. This website does not provide a forecast or prediction of future flood events or advice or warnings about floods that may occur in the future or their extent or impact.

 3. Any use, reliance, interpretation, copying or reproduction of any information available on this website is at your sole risk and responsibility.

 4. Without limited the previous sentence, to the extent that you use information found on this website to inform insurance or property ownership decisions about a particular property, you do so at your sole risk.



The Australian Capital Territory, its agents, officers and employees:

 1. Reserve the right to remove, modify or update any information provided on this website at any time without notice.

 2. Make no warranty or representations, either express or implied, about the accuracy, currency, completeness or suitability of the information or material available from this website in general or for any particular purpose.

 3. Accept no responsibility or liability (including without limitation, liability in negligence) for all expenses, loss, damages (including indirect or consequential loss) and costs arising from the use (or misuse) or, or reliance on, the information from this service.


This data shows the level of flooding that can be expected during a major flood event. It identifies which areas may be flooded and the probable depth and relative hazard of the water, right down to individual blocks.


This feature service is derived from flood extent model by removing null cells which are less than 6 sqm in size for display purpose in the ACTmapi's Flood Map.


Important notice

The riverine flood map information on this website is provided for information purposes only for members of the public. It has been compiled by the Australian Capital Territory using available resources at the time of production derived from the best available modelling of the catchments and watercourses. It is subject to the uncertainties of scientific and technical research which depend on a number of factors including, but not limited to: type of flooding, intensity, frequency and duration of rainfall experienced, time of flooding, weather factors including catchment soil moisture content, new building development and changes to or unforeseen factors associated with water management infrastructure. While the information presented on this website attempts to represent what may be experienced during a flood based on the best available information, actual flood events may differ substantially. Any use, reliance, interpretation, copying or reproduction of any information available on this website is at your sole risk and responsibility.

Information provided on this website may be removed, modified or updated at any time without notice. The Australian Capital Territory, its agents, officers and employees make no warranty or representations, either express or implied, about the accuracy, currency, completeness or suitability of the information or material available from this website in general or for any particular purpose, and accept no responsibility or liability for all expenses, loss, damages and costs arising from the use of, or reliance on, the information from this service.




ACT Government commissioned an engineering firm to undertake a review of nine existing flood studies to assess their veracity and efficacy in 2017.  Flood extents were derived from the review and published on ACTmapi and the Geospatial Data Catalogue.  The data comprises data from the studies below.

StudyDate CompletedEast Lake Pond and Lake Symonston Feasibility Study2012Ginninderra Creek Flood Study and Dam Assessment2015Jerrabomberra Creek Flood Study2005Molonglo Catchments and Scrivener Dam Flood Hydrology Review2011Sullivans Creek Flood Study and Kenny Stormwater PSP Design2015Tuggeranong Creek Flood Study2014Weston Creek Flood Study2015Woolshed Creek Flood Study (SALR PSP and Spitfire Avenue)2014/2016Yarralumla Creek and Long Gully Flood Study2015

Tags: 1_, actmapi, aep, emergency-management, extent, flood, gdc0b1360df, model
Organization: ACT Government Geospatial Data Catalogue (ACTmapi)