Breakfast Creek Rail Bridge Replacement
Client
WSP Parsons Brinckerhoff
Additional rail capacity at the Breakfast Creek rail crossing for the North Coast Line was needed and the existing steel rail bridge was identified as critical infrastructure that could be replaced with additional rail lines.
Background
Additional rail capacity at the Breakfast Creek rail crossing for the North Coast Line was needed and the existing steel rail bridge was identified as critical infrastructure that could be replaced with additional rail lines. Hydraulic modelling and an impact assessment was needed to inform the development of the preferred solutions for the replacement of the bridge, with a wider structure.
Solution
The existing TUFLOW flood model, provided by Brisbane City Council, was amended to include the offline parallel bridge option. We assessed impacts for the 1% Annual Exceedance Probability design flood event in terms of afflux and velocity changes as well as the 1 in 2000 AEP for ultimate state considerations. We investigated and discussed the implications on the results due to using different bridge modelling methodologies, and documented all changes to the model.
Outcomes
The assessment of afflux and velocity informed the development of the preferred solution for the replacement of the steel rail bridge across Breakfast Creek. This work was part of the reference design for Queensland Rail.