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Warriewood Valley
Watercourse
Narrabeen Creek, Mullet Creek, Fern Creek and Warriewood Wetland
Where does it flow to?
Narrabeen Lagoon at North Narrabeen (near intersection of Garden Street with Pittwater Road).
When has it flooded in the past?
1942, 1974, 1975, 1977, 1998, 1999, 2000, 2002
How many properties are flood affected?
Approximately 440
What are the flood risks?
- Flooding can occur from flash flooding from the creeks after heavy rainfall in the catchment or from backwater flooding from Narrabeen Lagoon or a combination of both. Flooding in Narrabeen Lagoon can occur after heavy rain in the catchment or from waves and king tides from the ocean during a severe ocean storm or a combination of both.
- Flash flooding means that flooding will occur quickly and there will be little opportunity for warning or assistance before or during a flood. However, flooding from backwater from Narrabeen Lagoon may mean that flood waters could remain elevated for many hours.
What is Council doing?
- Warriewood Valley Urban Land Release — all new development in the Warriewood Valley Urban Land Release Area must take flooding into account. The requirements are outlined in the Warriewood Valley Urban Land Release Water Management Specification (Lawson and Treloar, 2001)
- Warriewood Valley Flood Study (Cardno, Lawson Treloar, 2005) was adopted by Council in July 2005.
- Warriewood Valley Flood Study Addendum 1 (Cardno, Lawson Treloar, 2005) was adopted by Council in July 2005.
- Flood Planning Levels for all properties shown on the Flood Hazard Map were adopted by Council in September 2006.
What can I do?
- Being prepared for a flood is the best way to reduce the risks. The State Emergency Service (SES) is the lead response agency for floods, storms and tsunami across NSW. See the SES website for ways you can prepare for a flood.\
- Council will post information on the website and advertise in the local media whenever new information becomes available