McLachlan and James Street Intersection Stormwater Upgrade

Brisbane City Council

Fortitude Valley, QLD

The Brisbane City Council, McLachlan and James Street Intersection Stormwater Upgrade was a multidisciplinary high-risk construction project in one of the busiest intersections in Brisbane CBD, with large volumes of traffic throughout the day and a popular precinct for retail and dining outlets. This project was critical to the flood management program across the Brisbane CBD.

Diona was engaged to construct a stormwater receival chamber. Works involved survey, repair and shotcrete of two 100-year-old live stormwater brick tunnels running underneath James Street, the relocation of an Urban Utilities 324OD MSCL watermain, construction of an 18-metre cast in situ stormwater receival pit and the installation of a 43-metre-long reinforced box culvert drain.

The project consisted of four (4) separable portions all interlinked, but each of which had its own unique set of risks, which had to be identified and managed in order to successfully deliver the project. Key risks included, but were not limited to:

  • Traffic and pedestrian management;
  • Deep excavation including temporary works design;
  • Confined space entry; and
  • Working in tidal area.

Diona implemented numerous innovations to reduce the risk of the project and meet the contractual program. Some of the key innovation themes throughout this project already discussed include:

  • 3D utility mapping;
  • Integration of in situ structures with existing in-ground structures;
  • Temporary works design for shoring;
  • Scheduling of concrete pours;
  • 72-hour shut down of intersection; and
  • 48-hour shut down for full restoration works.

Diona combined the experiences of the entire delivery team to develop a fit-for-purpose solution and in the end, delivered this complex project on time and under budget to a very happy client and allowed the busy retail precinct to reopen before the 2019 Christmas period.

Key Services:


  • Winner: CCF QLD Earth Awards 2020 Project Value Up to $2m category


Richard Willis

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