BG&E was commissioned to provide design services for the Flood Damage Rectification Rail project following damage to the RTIO iron ore railway during a major flood event in February 2009.

At the Harding River Bridge, we completed emergency design works for retaining walls to allow the bridge to be reopened to rail traffic within a week of the damage.

At the RTIO Bridge 11 site, the abutments suffered significant damage. We assessed the condition of the existing bridge and determined options for reinstating the crossing. Options for removing the existing bridge girders and repairing the abutments were assessed; however, safety issues and time constraints made this approach impractical. It was decided that the existing bridge should be demolished and replaced with an arch structure that could be installed in a condensed timeframe.

We assessed options for arches and headwalls and worked with hydrology consultants and arch suppliers to develop a twin corrugated-steel arch design, with mechanically-stabilised earth headwalls and rock-protected guide banks. These 20m-span arches are the second largest constructed anywhere in the world.