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Survey now closed

Following from the Manly to Seaforth Flood Study which assessed flood risk in the area, we are now preparing a Floodplain Risk Management Study and Plan to help reduce the impacts of flooding for residents and businesses.

The study area includes the suburbs of Clontarf and Balgowlah Heights and parts of Manly, Fairlight, Balgowlah and Seaforth. It excludes the Manly Lagoon Floodplain.

This project will investigate a range of options to reduce flood risk in the study area and develop a long term plan for the management of flood prone land.

Have your say

Thank you for all the feedback provided via the community survey. The survey closed Sunday 14 June 2020.

As we undertake a rigorous engineering and cost analysis process, your input will help us further develop our understanding of the local context.

Once the draft study and plan have been prepared and put on public exhibition, the community will have the opportunity to discuss the results with Council Staff and the engineering consultants.

Study Area

We are investigating and managing the natural flooding caused by significant catchment rainfall resulting in overland flow - water that runs across the land after rain, before it enters a creek, harbour or the ocean.

A floodplain is any portion of land which is subject to inundation by floods up to and including the Probable Maximum Flood (PMF) event (or the highest conceivable flood that can occur).

A Flood Planning Area (FPA) is the land where residential flood related development controls apply.


Council recently commissioned engineering consultants WMA Water to complete a comprehensive Floodplain Risk Management Study for the area.

This study will consider a range of flood management measures, such as structural options (bigger pipes, detention basins etc.), emergency management improvements, community awareness activities and land use planning. The options will be assessed to understand the potential impacts and benefits, with a final suite of recommended options presented in the Manly to Seaforth Floodplain Risk Management Plan.

The main objectives of the floodplain risk management process are to:

  • minimise risk to life, health and safety
  • reduce flood damage to property and infrastructure in the existing community
  • ensure future development is controlled in a manner which is compatible with a catchment's flood risk
  • protect and enhance the floodplain environment and be consistent with relevant State Government policies
  • ensure that the Floodplain Risk Management Study and Plan has the support of the local community.

This project is supported by the NSW Government’s Floodplain Management Program.


  • Timeline item 1 - complete

    May/June 2020 - Community Survey

    Survey closed: Sunday 14 June 2020

  • Timeline item 2 - incomplete

    Public exhibition of the draft Study and Plan

    Includes community information sessions

  • Timeline item 3 - incomplete

    Report to Council

Have an enquiry?

Patrick Stuart

Senior Floodplain Management Officer

Email or 1300 434 434