Central Coast Council is preparing a floodplain risk management study and plan for the Northern Lakes catchment with financial assistance from the NSW Government through its Floodplain Management Program.
Council has identified the Northern Lakes catchment as prone to overland flooding across the following suburbs:
- Lake Haven
- San Remo
- Buff Point
- Lake Munmorah
- Norah Head
The aim of this study and plan is to reduce the impact of flooding and flood liability to residents living within the catchment area. As part of the NSW Government's Flood Prone Land Policy, consideration is given to social, economic, environmental and flood risk parameters to help evaluate a range of flood mitigation measures.
The study is being prepared by the consultant Manly Hydraulics Laboratory) and is funded by Council with additional funding and technical support provided by the NSW Government’s Office of Environment, Energy and Science.
Council invited all residents within the study area to complete a survey prepared by the flood consultant, Manly Hydraulics Laboratory, to help us identify flooding “trouble spots” – allowing for a targeted assessment of where flood risk reduction measures would be best implemented.
The results from the survey have been considered and incorporated into a draft Floodplain Risk Management Study and Plan which will be placed on public exhibition in the next few months.
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*This website does not necessarily represent the opinions of the NSW Government or the Department of Planning and Environment
About Northern Lakes catchment
The suburbs within the catchment are densely populated and the catchment is drained by a network of channels and stormwater drains. During periods of heavy rainfall, stormwater infrastructure can be overwhelmed, exceeding capacity and there is potential for overland or 'flash' flooding across homes and streets which flows into the Northern Lakes.
For residents within the catchment who have experienced severe flood events in the past, this causes significant disruption and inconvenience. There is also potential for property damage as well as risk to life.
Overland Flood Study findings
An overland flood study for the catchment was prepared in 2015. The outcome of the study confirmed that inundation of approximately 2,142 properties is predicted to occur during a 1% AEP event or a 1 in 100-year flood event. Problem areas have been mapped which identify the Flood Extents including:
- Panorama Avenue and Wirriga Avenue, Charmhaven
- Buff Point Avenue and Karangal Crescent, Buff Point
- Beach Parade, Toukley
The flood study investigated the flood behaviour and provides the technical foundation of the floodplain risk management study and plan.