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Shaping the ongoing entrance management

We are developing a strategy for the ongoing management of Narrabeen Lagoon entrance.

As a first step, we have prepared an options paper that outlines the way we currently manage the entrance and long-term options being considered.

We asked for your thoughts and suggestions on the potential ways the entrance could be managed in the future. Thank you to everyone who provided feedback, it will be considered in the preparation of the draft Narrabeen Lagoon Entrance Management Strategy.

As part of this project, we are investigating all aspects of entrance management, including emergency response arrangements, clearance work improvements and the long-term costs and sustainability of entrance-specific options.

Submissions regarding the options paper closed Sunday 28 March 2021.

Understanding Narrabeen Lagoon

Narrabeen Lagoon is one of the Northern Beaches' greatest natural and recreational assets. However, it is also prone to flooding and Council has been managing the entrance of the lagoon to reduce the risk of flooding for close to half a century.

We encourage you to watch the below video to learn more about Narrabeen Lagoon entrance and how Council currently manages this complex issue.

We want to thank Louise Collier and Ian Turner who feature in the video.

In 2019, Council adopted the Narrabeen Lagoon Floodplain Risk Management Study and Plan. This study evaluated a number of floodplain risk management options across the Narrabeen Lagoon catchment. With respect to the lagoon waterbody, it found that minimising the volume of sand within the lagoon entrance is still the most effective way of reducing flood risk.

In recent years, a widening of North Narrabeen Beach and an increase in adjacent sand volumes has led to entrance clearance operations needing to be completed more frequently.

As a result, a key recommendation of the Floodplain Risk Management Study and Plan was to prepare an Entrance Management Strategy for Narrabeen Lagoon.

In developing the Narrabeen Lagoon Entrance Management Strategy, we will review improvements to current management practices across the short-term and medium-term time horizons, as well as assess alternate management options across the long-term horizon.

For the purposes of the options paper, the short-term time horizon applies to mechanical breakout and emergency procedures, the medium-term time horizon applies to planned periodic clearance works, and the long-term time horizon applies to management options involving the installation of a more permanent structure.

Submission form now closed


  • Timeline item 1 - complete

    Feb-Mar 2021 Consultation on options paper

  • Timeline item 2 - active

    Mar-Apr 2021 Review of community feedback on options

  • Timeline item 3 - incomplete

    Apr-May 2021 Development of the draft strategy

  • Timeline item 4 - incomplete

    Jun-Jul 2021 Public exhibition of the draft strategy

Have an enquiry?

Name Duncan Howley - Floodplain Planning & Response Team
Phone 1300 434 434 (during business hours)
In writing

'Narrabeen Lagoon Entrance Management Strategy' Northern Beaches Council, PO Box 82, Manly NSW 1655.