Managing Flood Risk in your Neighbourhood


Public Exhibition of Draft Marrickville Local Environmental Plan 2011 (MLEP) Amendment No.2 and Draft Marrickville Development Control Plan 2011 (MDCP) Amendment No.2.

************************ UPDATE on 26/2/15 ************************************************

Following extensive community consultation, Council conducted a review of the flood map in the Marrickville local government area. This has now been completed and the number of properties identified as being in the Flood Planning Area (FPA) has been reduced from 4,456 to 2,104. All owners of property included in the FPA have been notified by a letter from Council.

The review involved:

Public Exhibition of Draft Marrickville Local Environmental Plan 2011 (MLEP) Amendment No.2 and Draft Marrickville Development Control Plan 2011 (MDCP) Amendment No.2.

************************ UPDATE on 26/2/15 ************************************************

Following extensive community consultation, Council conducted a review of the flood map in the Marrickville local government area. This has now been completed and the number of properties identified as being in the Flood Planning Area (FPA) has been reduced from 4,456 to 2,104. All owners of property included in the FPA have been notified by a letter from Council.

The review involved:

  • Updating the flood modelling where a 1 in 100 year storm event was used, instead of the probable maximum flood model applied in the original assessment;
  • Assessing all flooding to ensure it was due to overland flow impacts; and
  • Doing site inspections to gain a detailed assessment of topography or built infrastructure in or around the property.
A map detailing the FPA can be found here.The impact to properties included in the FPA is that future developments may need to include flood prevention measures like raising the floor level.

On 3 March 2015, Council will consider all final flood mapping recommendations as part of its consideration of a report on Marrickville Development Control Plan 2011 and Marrickville Local Environmental Plan 2011 Amendment No. 2.The report is available on Council’s website and members of the public may attend or apply to speak at the meeting. More information about how to do this can be found here. The results of the Council meeting will be published on this project page.

For further details on flood mapping please contact Kendall Banfield, Team Leader, Planning Services on 9335 2179. If you would like specific information about flooding in or around your property, please contact Ryan Hawken, Coordinator Asset Planning on 9335 2246.

************************ UPDATE on 2/9/14 **************************************************

Council is currently reviewing all properties that have been identified as flood prone as part of the draft LEP/DCP amendment 2 on exhibition period.

This means that all properties will be reviewed and where appropriate a site inspection will made to prove over land flow paths.

All properties will be notified further to any changes to the map during this engagement period. All
submissions will be considered and if further information is required council consultants WMA water will contact you individually.

************************ UPDATE on 27/8/14 **********************************************

Due to the high level of interest in the updated flood maps, Council is now extending the exhibition period by five weeks. The exhibition will now close on Monday 6 October 2014.

If you have contacted (or plan to contact) Council to register to attend flood mapping information session, you should be aware that thesession on Thursday 28 August is now full. Anyone who has missed out on that session and would like to make an appointment to meeting with Council’s flood mapping consultant, please contact Andrew Newman on andrew.newman@marrickville.nsw.gov.au or 9392 5370.

If you have made a submission, it has been registered and will be assessed in a post public exhibition report to Council. Everyone who has made a submission and/or has registered to attend a community information session will be notified of when this report will be considered by Council. The report will be available here on Your Say Marrickville before the meeting and anyone can apply to address Council at the meeting (click here to find out how).

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Council has recently resolved to put on public exhibition draft plans which propose to update the existing flood maps in Marrickville Local Environmental Plan (MLEP) 2011 and Marrickville Development Control Plan (MDCP) 2011.

The proposed changes are due to flood studies that have been completed since the MLEP and MDCP came into effect in 2011. The changes can be found in the LEP and DCP flood maps within draft Amendments No. 2 to the LEP and DCP.

If you received a letter recently from Council letting you know that the draft Amendments to the MLEP and MDCP show the property at your address as 'flood prone' - click here to read a summary of what this means for your property

How does Council identify properties as 'flood prone'?

Identifying properties as ‘flood prone’ - options and Council's chosen approach


Background to the flood studies

After a public exhibition process in May 2012, the Marrickville Valley Flood Study, Eastern Channel Flood Study and Cooks River flood study were all adopted as final documents in Feb 2013.

You can check this map to find which flood study identified which properties as flood prone

Download the flood studies here (please note they are very large files)

Marrickville Valley Flood Study

Eastern Channel Flood Study

Cooks River flood Study

At that time 14,000 letters were sent to property owners identifying the properties that may be classified as flood prone. Two information session workshops were held in May 2012. The draft flood map and the draft policy went to the Marrickville Floodplain Risk Management Advisory Committee on 7 December 2011 and 20 February 2013 and to Council on 20 February 2013 and 7 February 2012.

Current proposed changes to the flood maps

To read more about the current proposed changes to the flood maps in the draft Amendments No. 2 to the LEP and DCP go here.

To go directly to have your say about the proposed changes to the flood maps click here



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Also on public exhibition are

The Draft Hawthorne Canal Flood Study; and

The Draft Cooks River Floodplain Risk Management Study and Plan


What is the draft Hawthorne Canal Flood Study?

The Hawthorne Canal Flood Study is a collaborative project with Sydney Water, Office of Environment and Heritage, Ashfield Council and Marrickville Council. The Hawthorne Canal Stormwater Channel extends from Canterbury Road at Lewisham to Dobroyd Point at Iron Cove. Approximately 46% of the catchment is within Marrickville Council, 39% is within Ashfield Council and the remaining 15% is within Leichardt Council. See below extract Figure 1 Hawthorne Canal Flood Study.



The purpose of this flood study is to identify overland and mainstream flow in order to define existing flood liability. This is achieved through hydrologic and hydraulic modelling in accordance with the NSW Floodplain Development Manual.

The aims of this study include:

  • prepare suitable models of the catchment and floodplain for use in a subsequent Floodplain Risk Management Study.

  • provide results for flood behavior in terms of design flood levels, depths, velocities, flows and flood extents within the study area.

  • prepare maps of provisional hydraulic categories and provisional hazard categories.

  • determine provisional residential flood planning levels and flood planning area.

  • prepare preliminary emergency response to classifications for communities.

  • assess the sensitivity of flood behaviour to potential climate change effects such as increases in rainfall intensities and sea level rise.

The design flood modelling indicates that significant flood depths may occur in a number of locations in the Marrickville LGA including areas of Lewisham and Petersham as well as Parramatta Road and Old Canterbury Road. Preliminary flood planning areas that would identify properties for flood related development controls include a total of 591 properties in the Marrickville LGA.

The draft Hawthorne Canal flood study on Public Exhibition presents the results and findings including:

  • a summary of available flood related data and a summary of previous events.

  • details on the build and verification of the hydrologic and hydraulic models.

  • sensitivity analysis of the model results to variation of input parameters.

  • potential implications of climate change predictions with regard to sea level rise and rainfall intensity increase.

  • definition of design flood behaviour for existing catchment conditions.


Download the draft Hawthorne Canal Flood Study here


What is the draft Cooks River Floodplain Risk Management Study and Plan?

The Cooks River catchment area is approximately 100km2 and covers portions of 13 local government areas. The Marrickville catchment is drained by three open trunk drainage lines which discharge into the Cooks River (Eastern, Central and Western Channels). The image below extracted from the plan, shows the study area and the 5 sub areas.

Council received financial assistance from the Office of Environment & Heritage to undertake a review of the Cook’s River Floodplain Management Study 1994 and Plan 1997 prepared by Webb Mckeown and to address the existing, future and continuing flood problems, taking into account the potential impacts of climate change.

The draft management plan was prepared by Storm Consulting and WMAwater in accordance with the NSW Floodplain Development Manual 2005. The objectives of the study included identification and comparisons of various management options, including an assessment of their social, economic and environmental impacts and opportunities to enhance foreshore environments. The plan aimed to reduce flood hazard and risk to people and property in the existing community and to ensure future development is controlled with consideration of flood hazard and risk based on current influences and climate change.

The study was based on the Sydney Water Cooks River Flood Study February 2009 and included a community consultation of this study in May 2012 where it was publicly exhibited for a month. Two workshops were held with the community. The community was generally supportive of the flood study. The modelling of the climate change scenarios including rainfall intensity and sea level rise were carried out further to the Sydney water study as required by the NSW Floodplain Development Manual. The study also included an investigation and model validation using the March 2012 rainfall event.

The full range of management measures was evaluated and the outcomes summarised in in this table below.



Outcomes can change in the future due to changing community expectations, further analysis or climate change impacts. The proposed management measures are detailed below, categorised under general and specific measures

Download the draft Cooks River Floodplain Risk Management Study and Plan here
Maps and graphs 1
Maps and graphs 2


How to have your say on the draft flood studies
Community members can comment using the submission form below throughout the exhibition period, which is from Thursday 31 July 2104 to 5pm on Monday 1 September 2014.


What happens next??

Feedback closes on Monday 1 September. All the submissions received will be collated into a report to the elected Council, which will be posted here on Your Say Marrickville. The Councillors will consider the report at a Council meeting and will take the community’s wishes into account where possible when deciding whether to adopt the draft studies without changes, with changes or not to adopt them. Everyone who provides their email address as part of the submission process will be contacted with the date of that Council meeting.


  • CLOSED: Submissions have concluded.

    Submission form

    Community members can comment throughout the exhibition period, which is from Thursday 31 July 2104 to 5pm on 6 October  2014. 


    Community members can comment throughout the exhibition period, which is from Thursday 31 July 2104 to 5pm on 6 October  2014.