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Throsby, Styx and Cottage Creek Flood Study

We're updating the flood study for the Throsby, Styx and Cottage Creek catchments. Have your say in this study by sharing your flood stories.

Throsby, Styx and Cottage Creek Flood Study

Thanks to everyone who recently shared their experience and knowledge of flooding. We're reviewing your feedback and the updated flood study will be on public exhibition from mid 2022.

City of Newcastle is committed to building flood resilient communities. We have recently engaged a specialist in flood models and floodplain management to carry out an updated flood study for the Throsby, Styx and Cottage Creek catchments (see below map).

Updating this study will help us to plan and manage existing and future flood risks in this area.

Get involved

Engagement for this project has now closed.

What happens next...

Our project team and specialists in flood models and floodplain management will review all of the information obtained and develop a Throsby, Styx and Cottage Creek Flood Study. This study will be put on public exhibition from mid 2022.

Project timeline

Frequently asked questions

Flooding is a rare event that occurs when intense rain falls over a catchment. This intense rainfall produces high water levels that overtop natural rivers, creeks, the roadway and/or man-made channels.  

There are three types of flooding that can affect Newcastle including: 

  1. Flash Flood - Intense rainfall over the local catchment making runoff that exceeds the capacity of the drainage network causing flooding quickly and with limited warning. These floods are common for the local waterways in Newcastle such as Throsby, Styx, Cottage, Dark and Ironbark Creeks. 

  1. Hunter River Flood - Sustained heavy rainfall in the Hunter River catchment causing high river levels that spill out into the floodplain. These floods are common along the low-lying areas adjacent to the River such as Hexham, Beresfield and Sandgate.  

  1. Storm Surge - Oceanic storms on the coast causing elevated water levels, severe winds, and large waves. These floods are common in Newcastle Harbour and low-lying suburbs such as Stockton, Carrington, Wickham, Maryville and Islington. 

These events can occur independently or in combination. 

A flood study is a detailed investigation into the flood behaviour of a catchment. It is a technical undertaking that produces a flood model. The quality of this model is improved significantly by the flood knowledge of City of Newcastle (CN), and more importantly the community. It will define the depth, velocities, and flood hazard in the study area.  

The Flood Risk Management Plan (FRMP) builds on the completed flood study to identify and assess potential management approaches to reduce the impact of flooding on the study area. The FRMP is adopted by the elected Council. The management options can range from infrastructure upgrades, alert and emergency response, community awareness, development controls, voluntary house raising or voluntary house purchasing among other options. 

The updated flood study is being carried out for the Throsby, Styx and Cottage Creek catchments. This covers an area of 51 km² across the eastern half of Newcastle’s Local Government Area, generally characterised as land east of John Hunter Hospital. 

The Throsby, Styx and Cottage Creek catchments were last studied in 2012. Since then industry best practice, standards and guidelines have changed and an updated flood study is required. Combined with the rate of development and population density of these catchments it is important the most up to date flood information is provided to ensure the best outcomes for the community are achieved. CN will progressively update all flood studies across the LGA following on from the Throsby, Styx and Cottage Creek Flood Study. 

Yes, all information you can provide about flooding is valuable. All catchments across the city will be progressively assessed in a flood study. 

The Department of Primary Industry and Environment (DPIE) has supported the current Throsby, Styx and Cottage Creek Flood Study through Grant Funding. DPIE will oversee the delivery of the Throsby, Styx and Cottage Creek Flood Study to ensure it is completed in accordance with the NSW Floodplain Development Manual. 

CN have collated a wide variety of flood information from residents through photos, requests, observations during flood events, news reports and surveys. However, we can never have the complete picture of flood intelligence across the city. Images and experiences from the 2007 ‘Pasha Bulker’ storm are particularly valuable but we encourage all residents to engage and provide as much information as possible about flooding in Newcastle.

Contact us

Luke Jones

Integrated Water Cycle Engineer

Phone: 02 4974 2000
Email: mail@ncc.nsw.gov.au

This project is supported with funding from the NSW Government.

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