The study itself does not create a new risk to properties; it is qualifying an existing flood risk.

Some properties are already identified in the Boroondara Planning Scheme as likely to flood due to a 1% AEP event.

As a result of this new study, approximately 4,300 additional parcels of land in Boroondara have been identified as at risk.

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Flash flooding and insurance

Any property within the municipality is potentially at risk of storm damage resulting from flash flooding, regardless of whether they have been identified by the flood mapping study or not.

The study identifies the risks of ‘flash flooding’ and stormwater rainfall run-off, which are included under storm damage provisions of domestic insurance policies.

This is different from the definition of ‘flooding’ provided by the Insurance Council of Australia, and does not relate to flooding from rivers or creeks.

The information provided by the study can help residents to minimise losses resulting from future flash flood events but we recommend you contact your Building and Home and Contents insurer if you want to know whether flash flooding from overland stormwater flow is covered in your policy, and to what extent.

Information specific to your property

Owners and occupiers of affected properties should have received notification of their property being included in an area of flood risk.

If you would like general information of the risk to your property, you can request a free Flood Assessment Report.

If you are planning to conduct works on your property and need specific flood level data, you must complete a Flood Level Application.

Flood Assessment Report

You can request a free flood assessment report for individual properties by contacting us on 9278 4444 or at [email protected]

The flood assessment report will include:

  • a map showing the extent of flooding forecast
  • a description of the overland flow forecast
  • comments on potential impacts on existing buildings and works on the property
  • comments on potential impacts on future development of the property.

Please allow up to 4 weeks for an individual report to be prepared.

Flood Level Application

If you are proposing new buildings or works on your property, you will need to complete a Flood Level Application Form (PDF, 248 KB)

Application forms must be completed and returned along with a detailed feature and level survey of the site along with plans of the proposed works.

There is a $240 fee for this service.

Once the assessment has been completed, you will receive a report containing:

  • the applicable flood levels for the site
  • advice on modifications required to mitigate flood risk
  • a review of modified plans against building regulation requirements for buildings and works on land liable to flooding.

No noticeable effect on property values

To determine whether the introduction of a flooding overlay will have an impact on property values, we looked at the site values of a sample of properties before and after the introduction of the Melbourne Water Special Building Overlay (SBO) in 2006.

The analysis considered the change in property values over a four-year period spanning the introduction of the SBO.  For the properties analysed, the average site value increase for properties located within the SBO was 88 per cent, which is only marginally below the 89 per cent increase in site values for properties located outside of the SBO.

New Report and Consent requirement for building works

The flood mapping study was adopted by Council at the Council Meeting on 11 June 2019. Licensed Building Surveyors must now obtain report and consent from Council before they can issue a permit for buildings or works on affected properties.

We will help with this by providing specific flood level information so that buildings can be appropriately designed to reduce the risk of flash flooding. To obtain this information, a Flood Level Application must be completed.

Council officers will reply to this application with applicable flood levels for the property and appropriate flood mitigation advice. This mitigation advice will typically include:

  • where buildings and works should be located away from overland flow paths and
  • where and to what extent, living areas need to be raised above flood levels.

We will only grant consent if the owner, builder or developer can demonstrate that they have adequately addressed the flood risk to the property in the design of their buildings or works.

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