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Lake Cathie Flood Mitigation

Released on: 21 May 2020

Released on: 21 May 2020

Following a resolution of Council at last night’s Ordinary Meeting, work will begin tomorrow morning, Friday 22 May to alleviate the risk of flooding at Lake Cathie.

This decision follows approval received from NSW Department of Planning, Industry and Environment - Crown Lands to undertake emergency flood mitigation works, to alleviate the risk of flood inundation at Lake Cathie.

This licence is conditional upon receiving further input from both the Department of Primary Industries (Fisheries NSW), and National Parks and Wildlife Service who recommended a scraping of the beach berm at 1.6 metres.

Council resolved to take a more community-minded approach, and scrape the beach berm on the northern end of the lake at a depth of 1.2 metres RL (reduced level) and 6 metres wide, forming a 135-metre long channel between the Lake and the ocean.

Scraping of the beach berm is considered a more environmentally sympathetic approach than a deep channel excavation. The beach berm scrape method may result in a reduced risk of acid sulphate exposure or discharge, ensure the habitat of the Green and Golden Bell Frog and Black Swan is maintained, and reduces the risk of fish kills.

However, Council is aware that by scraping to a depth of 1.2 metres rather than 1.6 metres may increase the likelihood of a lower level of water in the lake, and may result in impacts on foreshore habitats and exposure of acid sulphate soils.

Heavy machinery will be used to scrape the beach berm, and the community are advised to keep well clear of the work area to ensure their personal safety, and advised not enter the water near the work area.

For further information on Lake Cathie visit pmhc.nsw.gov.au/lake-cathie.