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Lake Cathie Coastal Zone Management Plan

The coastline around Lake Cathie is particularly exposed to coastal processes that threaten private and public assets. Coastal erosion has occurred south of the Lake Cathie entrance and has led to exposure of coffee rock that underlie the dune system. Coffee rock is formed by the process of induration - which is the hardening of soft sand. This coastal erosion is likely to increase over time under current predictions for climate change and the projected sea level rise. Lake Cathie has been identified as one of fifteen (15) coastal erosion “Hotspots” along the NSW coast by the Office of Environment & Heritage (OEH)

The  Coastal Zone Management Plan (CZMP) process for Lake Cathie3MB pdf(PDF, 3MB) came about after the following studies were undertaken.

  1. The Lake Cathie Coastal Hazard Study - completed in 2008 and later revised in 2010 to take into account the introduction of the NSW Government’s sea level rise planning benchmarks (NSW Sea Level Rise Policy, 2009).
  2. The Lake Cathie Coastline Management Study - Stage 1 - completed in 2009 provides a preliminary assessment of 13 potential options to address coastal hazards for this area.
  3. The Lake Cathie Coastline Management Study - Stage 2 - completed in 2012. This report identified the need for Council to address Coastal Management options and the following 4 options were assessed in more detail and included in community consultations.
    1. 400m Revetment protection for Illaroo Road
    2. Groyne
    3. Beach Nourishment
    4. Planned retreat including acquisition/voluntary purchase

Community consultation concluded with an overwhelming support for a revetment wall with beach nourishment.

The Lake Cathie CZMP incorporates a revetment and beach nourishment as the management option in particular for Illaroo Road and will guide the management of the Lake Cathie foreshore into the future to ensure the most beneficial outcome for local residents, the community and the environment.

Under Section 55G of the Coastal Protection Act 1979 the CZMP requires certification from the minister. In a letter dated March 2015 the Minister for the Environment requested a number of actions be undertaken before the CZMP would be certified. Council completed these actions and additional information has been incorporated into the Lake Cathie CZMP including the results of a social and economic assessment of coastal protection options, which supports Council’s preferred option of a revetment as the main long-term management option in the CZMP.

The revised CZMP was adopted by Council in April 2016 and was certified by the Minister for Planning on 1st November 2016. The CZMP was published in the NSW Government Gazette on 27th January 2017.

Lake Cathie Study Area

Lake Cathie / Lake Innes Coastal Model Development and Investigation

This page was last updated on: 02 April 2020