Wallarah Creek Catchment - Floodplain Risk Management Study and Plan

Wallarah Creek Catchment - Floodplain Risk Management Study and Plan

Wallarah Creek Catchment - Floodplain Risk Management Study and Plan
This public exhibition has now concluded.

Central Coast Council's Floodplain Risk Management program has identified the Wallarah Creek catchment as prone to flooding across the following suburbs:

  • Blue Haven
  • Wallarah
  • Bushells Ridge
  • Doyalson
  • San Remo
  • Charmhaven
  • Woongarrah

A draft of the Wallarah Creek Floodplain Risk Management Study and Plan was placed on public exhibition for a period of six weeks (25 June - 5 August 2020) for the community to review. This draft study and plan was developed based on a detailed analysis of the feedback we received from our first round of community consultation in 2017, and an assessment of potential management measures.

This draft study and plan is now being finalised and will be presented to Council for adoption in the coming months. 

Community members are still able to:

  • review the draft study and plan: Take a look at the draft of the Wallarah Creek Catchment Floodplain Risk Management Study and Plan in the document library on the right of this page
  • check out our interactive map: We've mapped out the recommended options from the flood study and plan, as well as flood extents for 1% annual exceedance probability floods and probable maximum flood events on an interactive map
  • read our frequently asked questions: Make sure you check out our frequently asked questions on our main floodplain management page to see if we haven't already answered your question!
  • take a look at the engagement summary: Read about who we reached and what the results were from the public exhibition period

*This website does not necessarily represent the opinions of the NSW Government or the Department of Planning, Industry and Environment.

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About the study and plan

The Wallarah Creek Catchment Flood Study, prepared for Council by Catchment Simulation Solutions in 2016, provided a technical assessment of flood behaviour throughout the catchment and identified that during periods of heavy rainfall there is potential for water to overtop the banks of the various creeks and waterways and inundate adjoining properties. There is also potential for the capacity of the stormwater system to be exceeded leading to local overland flooding.

This project is the next step in the NSW Government’s Floodplain Risk Management Process. Using the information from the preceding flood study, it has evaluated, recommended and prioritised measures for better managing the existing, future and continuing flood risk across the catchment.

The study is being prepared by the specialist flood consultant Catchment Simulation Solutions and is funded by Council with additional funding and technical support provided by the NSW Government’s Department of Planning, Industry and Environment (DPIE).

About Wallarah Creek catchment

The Wallarah Creek catchment comprises 33km2 of largely undeveloped land. 

This catchment is drained by two major watercourses (Spring Creek and Wallarah Creek) as well as a number of unnamed tributaries which carry runoff in an easterly direction into Budgewoi Lake.  A local stormwater system also drains runoff from the urban areas into creek system.

During periods of heavy rainfall, the capacity of the stormwater system can be exceeded, resulting in overland or 'flash' flooding across homes and streets.  There is also potential for water to overtop the banks of the creeks and inundate the adjoining floodplain.  Flooding has been experienced across the catchment on a number of occasions in the past including in 2007 and more recently in 2020.

Inundation from elevated water levels in Budgewoi Lake is not assessed as part of this study as this flooding mechanism was previously addressed as part of the Tuggerah Lakes Floodplain Risk Management Study and Plan (WMAwater, 2014).  This study is concerned only with flooding from the local catchment draining into Budgewoi Lake.

Your questions answered!

When will the walkway between Allambee Crescent and Colorado Drive be cleaned up? Water sits there, which is unhealthy, and it is also is a rubbish dumping area.

Council understands your concern about the clean-up and rubbish being dumped on the walkway. However, please note that illegal dumping and clean outs are not in the scope of this Floodplain Risk Management Study and Plan (FRMSP) currently on exhibition.

Illegal dumping can be reported to the Hunter-Central Coast Regional Illegal Dumping (RID) Squad on 131 555 or via https://ridonline.epa.nsw.gov.au/#/home.

Alternatively, you can report it to Council by calling our friendly customer service team on 1300 463 954 or through our online customer service portal (link provided below). Lodging this way ensures it is registered in Council's system and will provide you with a reference number of which you'll be able to track if necessary. www.centralcoast.nsw.gov.au/customerportal

Got a question you would like answered about this study and plan?

Simply type it into our Q&A board and we will have someone respond to you within three business days.

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