Tweed Valley Flood Study update and expansion

Share on Facebook Share on Twitter Share on Linkedin Email this link

Tweed Valley flood study update and expansion


Tweed Shire Council, with support from the Department of Planning, Infrastructure and Environment (DPIE), has engaged flood specialists WMAwater to update and expand the Tweed Valley Flood Study.

Community input has an important role in the flood study. We would like to understand your personal experiences and insights from past flood events. We're seeking input from Tweed Valley residents to help us better understand community concerns and improve our understanding of flooding events in the region. Please complete the survey by Sunday 30 May 2021.

There's a long history of flooding in the Tweed Valley with the most recent major event occurring in March 2017 as a result of ex-Tropical Cyclone Debbie. This event had widespread and devastating impacts on our community, property, business, industry and public infrastructure.

This project is funded under the NSW and Commonwealth Government's Natural Disaster Resilience Program.


What is a flood study?

A flood study is a technical investigation of the flood behaviour for a region. Flood studies comprise computer models to simulate historical and design flood events in the region.

Past historical flood events provide recorded flood data (rainfall amounts, water levels and flows) and community experiences, which are used to calibrate and verify the models.

The study will help define flood behaviour under current and future climate conditions. This technical information forms the basis to understand flood risk and management options in future floodplain risk management studies and plans.


Why do we need another flood study?

The previous flood study, completed in 2009, is being updated and expanded to include new areas.

Flooding is not confined to one part of the Tweed Valley and we want to extend our understanding of flooding to include the upper parts of the valley, including the villages of Tyalgum, Chillingham, Uki and the surrounding rural areas.


Map showing the original 2009 flood study area and the expansion area.Map showing the original 2009 flood study area and the expansion area.

Recent advances in the hydrology field and new flood records from March 2017 provides a good opportunity to improve our understanding of flood behaviour in the valley.


What are the different flood types?

The Tweed Valley is about 1100 km2 and incorporates a range of landscapes including steep channelised valleys, floodplains and coastal estuaries. This variation in landscapes creates three defined types of flooding:

  • riverine flooding is caused when the flow of water bursts the banks of creeks or rivers
  • storm surge flooding is an abnormal rise in sea water level due to a storm
  • overland stormwater is generated by rainfall running off towards the drainage or creek system.


Community consultation

We're calling on Tweed Valley residents to share their personal experience and knowledge to help us understand past flood events.

Please complete the survey by Sunday 30 May 2021.

Tweed Valley residents were asked to share their personal experience and knowledge to help us understand past flood events.

Your feedback will be provided to WMAwater to analyse and include in the Tweed Valley Flood Study update and expansion.

If you have any questions or would like to provide additional information or photos please contact:

Leon McLean
Engineer – Flood and Stormwater
Email: tsc@tweed.nsw.gov.au
Phone: 02 6670 2400

Tweed Valley flood study update and expansion


Tweed Shire Council, with support from the Department of Planning, Infrastructure and Environment (DPIE), has engaged flood specialists WMAwater to update and expand the Tweed Valley Flood Study.

Community input has an important role in the flood study. We would like to understand your personal experiences and insights from past flood events. We're seeking input from Tweed Valley residents to help us better understand community concerns and improve our understanding of flooding events in the region. Please complete the survey by Sunday 30 May 2021.

There's a long history of flooding in the Tweed Valley with the most recent major event occurring in March 2017 as a result of ex-Tropical Cyclone Debbie. This event had widespread and devastating impacts on our community, property, business, industry and public infrastructure.

This project is funded under the NSW and Commonwealth Government's Natural Disaster Resilience Program.


What is a flood study?

A flood study is a technical investigation of the flood behaviour for a region. Flood studies comprise computer models to simulate historical and design flood events in the region.

Past historical flood events provide recorded flood data (rainfall amounts, water levels and flows) and community experiences, which are used to calibrate and verify the models.

The study will help define flood behaviour under current and future climate conditions. This technical information forms the basis to understand flood risk and management options in future floodplain risk management studies and plans.


Why do we need another flood study?

The previous flood study, completed in 2009, is being updated and expanded to include new areas.

Flooding is not confined to one part of the Tweed Valley and we want to extend our understanding of flooding to include the upper parts of the valley, including the villages of Tyalgum, Chillingham, Uki and the surrounding rural areas.


Map showing the original 2009 flood study area and the expansion area.Map showing the original 2009 flood study area and the expansion area.

Recent advances in the hydrology field and new flood records from March 2017 provides a good opportunity to improve our understanding of flood behaviour in the valley.


What are the different flood types?

The Tweed Valley is about 1100 km2 and incorporates a range of landscapes including steep channelised valleys, floodplains and coastal estuaries. This variation in landscapes creates three defined types of flooding:

  • riverine flooding is caused when the flow of water bursts the banks of creeks or rivers
  • storm surge flooding is an abnormal rise in sea water level due to a storm
  • overland stormwater is generated by rainfall running off towards the drainage or creek system.


Community consultation

We're calling on Tweed Valley residents to share their personal experience and knowledge to help us understand past flood events.

Please complete the survey by Sunday 30 May 2021.

Tweed Valley residents were asked to share their personal experience and knowledge to help us understand past flood events.

Your feedback will be provided to WMAwater to analyse and include in the Tweed Valley Flood Study update and expansion.

If you have any questions or would like to provide additional information or photos please contact:

Leon McLean
Engineer – Flood and Stormwater
Email: tsc@tweed.nsw.gov.au
Phone: 02 6670 2400

  • Community input has an important role in the flood study. We would like to understand your personal experiences and insights from past flood events. 

    For us to better understand community concerns and improve our understanding of past flood events in the region, please complete this survey by Sunday 30 May 2021.

    The survey should only take 10 minutes to complete. Please try to answer as many questions as possible in as much detail as you can and include additional information/files if required.

    Your feedback will be forwarded to WMAwater to analyse and include in the Tweed Valley flood study update and expansion.

    Take Survey
    Share on Facebook Share on Twitter Share on Linkedin Email this link