Banana Shire Flood Study

GOOVIGEN AND JAMBIN

Historic flooding

Flooding at Goovigen is primarily governed by local flooding from Camp Creek. Flooding from Callide Creek has an impact on residents’ ability to access areas outside of the Township, particularly to Jambin. Jambin is impacted by flooding from the upstream Callide Creek and Kroombit Creek catchments. During significant events, flood levels are influenced by the existing railway embankment that traverses the floodplain at Jambin and the Burnett Highway embankment.

 

Extent of flooding

The below table explains the multiple Annual Exceedance Probability (AEP) flood events analysed as part of the Study. AEP indicates the probability of a flood event occurring each year expressed as a percentage. Flood probability can also be expressed as an Annual Recurrence Interval (ARI).

Annual Exceedance Probability, AEP

Approximate Annual Recurrence Interval, ARI

Impact on Townships

10% chance of occurring each year or 10% AEP

Approximately 1 in 10 year event

  • Portion of Jambin inundated
  • McCabes Road from Goovigen is severed
  • Burnett Highway (south) and Jambin Dakenba Road from Jambin is severed

5% chance of occurring each year or 5% AEP

Approximately 1 in 20 year event

  • Jambin completely isolated

2% chance of occurring each year or 2% AEP

Approximately 1 in 50 year event

  • Jambin completely inundated
  • Patersons Road from Goovigen severed at Camp Creek
  • Jambin Hall and evacuation centre inundated

1% chance of occurring each year or 1% AEP

Approximately 1 in 100 year event

  • Similar magnitude to the 2015 flood event

1% AEP event Climate Change (CC) sensitivity simulation or 1% + CC AEP

Approximately 1 in 100 year event - adjusted for climate change sensitivity

  • Identified in images below

0.05% chance of occurring each year or 0.05% AEP

Approximately 1 in 2000 year event

  • Goovigen impacted by Callide Creek
  • Jambin State School and evacuated centre remains flood immune, however access is restricted from the 5% AEP

A Probable Maximum Flood (PMF) event is the largest flood event that could occur at any given location. It is usually an estimated rainfall depth calculated using a range of methods and patterns.

  • Some properties along Stanley Street in Goovigen are impacted
  • Goovigen Community Hall and evacuated centre impacted

 

Considering the information above, the proposed area of investigation to protect residents from the impact of flooding in Jambin is shown below. An existing levee on the western side of Goovigen already provides some flood protection for Goovigen from Camp Creek flooding. Therefore, additional direct structural measures are not being investigated in any areas within the Township. An inundation map for the 1% + CC AEP event is also shown below.

Image: Proposed area of investigation (Jambin) with 1% + CC AEP flood inundation depths shown

 

Image: 1% + CC AEP flood inundation depths (Goovigen)

 

Potential flood mitigation options

Flood mitigation strategies are aimed at reducing residual risk, improving safety, minimising damage by reducing peak flood levels and depths, improving warning times and reducing flow velocities. This can be achieved through both structural and non-structural measures.

Some non-structural measures already form part of Council’s current Local Disaster Management Plan and Planning Scheme. After the completion of the Floodplain Management Plan, additional measures and updates to Council’s plans and schemes may occur.

An existing levee on the western side of Goovigen already provides some flood protection for Goovigen from Camp Creek flooding. Therefore, additional direct structural measures are not being investigated in any areas within the Township. There are also limited opportunities to provide feasible structural measures to reduce the flood risk in Jambin due to the town’s position within the Callide Creek floodplain.   

The structural measures identified that may reduce flood risk within the proposed area of investigation in Jambin include:

  • Low levees, large levees or a combination of both to provide some level of flood protection to residents
  • Individual property levees
  • Raising of existing stumped houses.

Submit your feedback

Community feedback is a vital tool when analysing the viability and acceptance of proposed areas of investigation. To submit your feedback, please fill out the survey by clicking on the link below.

When answering Question 4, please rate your most preferred option as 1, your second most preferred option as 2, your third option as 3, and least preferred option as 4.

Surveys can be downloaded and submitted by email at floodstudies@kbr.com or by mail at Reply Paid GPO BOX 633, Brisbane QLD 4001.

 

Survey for Goovigen and Jambin