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Lake Cathie Dredging Strategy

Lake cathie dredging May 2018
May 2018

Council is responsible for the management and maintenance of the surrounding foreshore reserves and nearby beaches of Lake Cathie. The estuarine system on both the west and east sides of the Kenwood Bridge are owned and managed by the NSW State government.

Council’s role in dredging Lake Cathie is to provide recreational amenity to the community. In order to undertake such work, Council must request permission from the state to do so. Due to the ongoing nature of these works Council has identified periodic maintenance dredging as a suitable means to remove accumulated sand banks within the waterway. The   Dredging Strategy1MB pdf(PDF, 1MB) (2007) proposes ongoing dredging every 5-10 years. The Lake Cathie Coastal Zone Management Plan (2016) identifies excess dredged sand to be placed on Lighthouse Beach to act as a mitigation measure for predicted long term coastal recession.

The lower Lake Cathie estuary is periodically dredged with the dredge spoil placed on Lighthouse Beach to create a sand buffer from coastal erosion impacts. In the intervening years after dredging occurs, sand accumulates into the lower estuary and can impact on the amenity of the recreational activities generally undertaken in the lower waterway. The sand buffer on Lighthouse Beach is typically also lost during this time due to the erosional nature of the beach environment.

This work is typically undertaken with a ‘suction/cutter’ dredge. The beach nourishment work involves placement of dredged sand in front of the properties along Illaroo road to form an artificial dune. The placement of this sand is typically undertaken by an excavator with the sand being pumped to the beach via a pipe from the dredge.

This page was last updated on: 02 April 2020