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​North Bundaberg Evacuation Route.png

North Bundaberg
Evacuation Route

This project involved an options analysis and concept planning to develop a number of approaches to provide improved flood evacuation and repatriation time, whilst addressing isolation issues for North Bundaberg residents during major Burnett River flood events. 

 

HIG were engaged by Department of Local Government, Racing and Multicultural Affairs (DLGRMA) to investigate a raised roadway that would span between the existing Tallon Bridge northern abutment and the Roundabout on Bundaberg – Gin Gin Road.

Client

Department of Local Government, Racing and Multicultural Affairs

Project Category

​Transport Planning and Traffic Engineering

Our Project Mission

Flood Warning System for the Burnett River (BoM 2021).jpg

Following hydraulic analysis of various culvert configurations, it was determined that the new culvert size be 2/2400x2400 RCBC’s. This provided an improvement of flood immunity from the current less than 5-year immunity to be flood free for the 100-year event.

Our Approach

Multiple options were investigated, including a single and dual lane viaduct both east, west and online of the existing roadway, with different configurations of on and off ramps with various connections to the existing road network.

 

A major constraint of the project was to provide a solution that would limit the closure time of the Tallon Bridge during construction, as the only other connection across the Burnett River is the Burnett Traffic Bridge which has weight restrictions. Also, the capacity would be an issue as seen following the 2013 flood event when the Tallon Bridge was closed temporarily due to a failure in the northern abutment.

 

Impact to flood conditions was also a very important aspect as the new structure would need to have little impact in terms of afflux and velocities. The flow conditions through this North Bundaberg area during major Burnett River flood events when the water breaks the banks is complex and a new flood model was created to ascertain the impacts of the proposed options.

 

Discussions were had to share information between this project and the house buyback scheme that was being undertaken in parallel as the viaduct option to be progressed may change the flood conditions and directly impact buyback requirements.

 

Technical components of the project included viaduct design, on and off ramp design, pedestrian and cycleway retrofitted to the existing Tallon Bridge with connection to existing infrastructure, intersection configurations, lighting, drainage, pavement design and PUP relocation.  The design also considered visual amenity, Crime Prevention through Environment Design, connectivity, community expectation and value creation.

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