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Floodplain Risk Management Study and Plan

Lake Macquarie Waterway - Flood Risk Management Study & Plan

The Lake Macquarie Waterway Flood Risk Management Plan has been prepared in accordance with the NSW Floodplain Development Manual (April 2005) and the August 2010 Flood Risk Management Guide – Incorporating sea level rise benchmarks in flood risk assessment and: Is based on a comprehensive and detailed evaluation of factors that affect and are affected by the use of flood prone land; Represents the considered opinion of the local community on how to best manage its flood risk and its flood prone land; and Provides a long-term path for the future development of the community. The Lake Macquarie waterway (the lake itself) has a catchment area of approximately 700 square kilometres to the Pacific Ocean. Of this approximately 110 square kilometres (16%) is the area of the lake. The lake is approximately 22 kilometres in length and up to 8 kilometres wide, with a perimeter of 170 kilometres. The lake is surrounded by bushland, parkland, and residential developments that value its scenic quality as well as its commercial and recreational value. The entrance to the Pacific Ocean is by the narrow and shallow 4 kilometre long Swansea Channel. The lake level is normally at 0.10 mAHD and tidal fluctuations are generally only ±0.05m. Elevated ocean levels (high tides and storm surge) as well as intense rainfall over the catchment cause the lake level to rise. The highest recorded lake water level is 1.25 mAHD in 1949 (at Marks Point), with 1.05 mAHD reached in the June 2007 long weekend storm/flood event and 1.00 mAHD in February 1990. The June 2007 long weekend storm/flood event, and the February 1990 flood event were of the order of a 30 year Average Recurrence Interval (ARI) design event. Flooding causes significant hardship (tangible and intangible damages) to the community, and the impacts will increase as sea levels rise, and for this reason Lake Macquarie City Council has undertaken a program of studies to address the management of flood risks. The present review was initiated by Lake Macquarie City Council to reassess flood risk management options and incorporate the NSW Government’s sea level rise benchmarks, based on predictions by the Intergovernmental Panel on Climate Change (IPCC) and the CSIRO Technical Review for Australia, and also the potential increase in rainfall intensities due to climate change, and evaluate suitable adaptation measures.

Additional Information

Field Value
Title Lake Macquarie Waterway - Flood Risk Management Study & Plan
Publication Date June 1, 2012
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Tiles by MapBox
Council/LGA Lake Macquarie City Council
Author/ Prepared by WMA Water
Publish date March 28, 2017
Update date March 28, 2017
River Basin 211 - Macquarie Tuggerah
Place Name Lake Macquarie
Approval State Approved
Submitted for approval March 28, 2017
Submitted by John Silk
Approved March 28, 2017
Approved by silkj
Data Comment

Report in 4 parts with figures; no other data. Legacy data; may have been superseded.

The objectives of the Study are to identify and compare various management options, including an assessment of their social, economic and environmental impacts, together with opportunities to enhance the foreshore environments. The primary aim of the Plan is to reduce the flood hazard and risk to people and property in the existing community and to ensure future development is controlled in a manner consistent with the flood hazard and risk at this time and as a result of climate change (sea level rise). This review combines and updates the previous Lake Macquarie Floodplain Risk Management Study (2000 – Reference 1) and Plan (2001 – Reference 2) into one document.

Identifier c1cedf75-7f18-4e3c-b6ba-0516a1eb1ede