Property and Infrastructure Specialists
Employing our proven expertise in verification and marine engineering to ensure all aspects of this complex project met the contract requirements.
SA Water and AdelaideAqua D&C Consortium
Lonsdale, SA

Long-term water security for Adelaide

Adelaide's Desalination Plant at Lonsdale was built to provide a secure water source for Adelaide, regardless of climatic conditions.  

The plant delivers a supply of 100GL of potable water per year – reducing the city’s reliance on reservoirs in the Mount Lofty Ranges and Murray-Darling Basin catchments.

Complex engineering

The project consisted of:

  • Two identical process plants of 50GL capacity each
  • Two under-sea, segmentally lined TBM-driven tunnels, one each for intake and outfall streams (1.1km and 1.5km respectively)
  • Landside shafts up to 50m deep, for seawater intake and outfall return
  • Interconnecting tunnels
  • Underground pump station within a mined cavern
  • Sub-marine tunnel connections
  • Sea-floor risers
  • Marine intake structure and outfall diffusers.

600,000m3 of fill had to be cut and re-compacted in the highly reactive clays of the area. Groundwater also had to be managed, to avoid potential contamination from an adjacent decommissioned oil refinery.

Proven expertise

Because of our proven verification knowledge and technical skills, SA Water and AdelaideAqua D&C Consortium selected APP as the independent verifier on the $1.8B project.

The specialist skills we brought to the project included expertise in:

  • Desalination
  • Sub-marine TBM-driven, segmentally lined tunnels
  • Marine works, sub-sea tunnel connections and sea bed structures
  • Deep shafts and underground caverns
  • Systems engineering
  • Durability in marine and hyper-saline conditions

Comprehensive monitoring

Our role was to verify that the design and construction met all the requirements of the contract. This involved observing, monitoring, reviewing, auditing and verifying every aspect of the project, including:

  • Quality assurance systems
  • Project management systems
  • Design documentation,
  • Construction
  • Materials
  • Operations
  • Maintenance procedures


We gave our clients total confidence in how the project delivery requirements were met, by developing a sophisticated project delivery requirements matrix, integrating multiple subsystems covering:

Enquire now

Working for over 500 clients across more than 800 projects annually - these are some of the examples of what we do.

Our latest news and thought leader views.