Hawthorn Main Sewer is an ovoid sewer in Melbourne that was constructed in 1903, over 100 years ago. For the sewer to continue to provide reliable wastewater services for the local community, manhole rehabilitation was required.

Using CIPM, delivery partners Alternative Lining Technologies and Abergeldie Complex Infrastructure rehabilitated six manholes up to 18m deep, extending their lives for another 50 years.

Importantly, each was completed in one day, minimising disruption to the local community. To date, solutions for manhole rehabilitation projects have generally been limited to cementitious coatings, such as calcium aluminate cement, epoxy coatings or slip lining.

Although acceptable solutions, none provided the necessary attributes for the unique requirements of Hawthorn Main Sewer.

The Challenge – the project alignment was through a residential area of suburban Melbourne where consideration for the community was paramount. The project presented several other difficulties including the depth of manholes, shape of the manholes, groundwater levels and traffic management.



The Solution – the solution adopted on this project was Alt Liners CIPM (Cured in Place Manhole) technology. This was selected due to the speed of installation, the minimised reduction in diameter of the manholes, the superior structural capabilities and the added safety benefits during installation.

By utilising CIPM, the project had less impact on the community, lower labour costs and reduced traffic management requirements.

Features and benefits of CIPM include:

  • Speed of Installation – 18m deep manhole rehabilitated in one day!
  • Safety – time in the manhole is limited to a couple of hours, not several days
  • Structural – CIPM provides structural integrity with its monolithic invert to lid design
  • Longevity – CIPM will last 50-plus years due to its PVC multi-layered composite construction
  • Non-sacrificial – CIPM does not deteriorate over time like other coatings providing longer life cycle and lower whole-life costs

This partner content is brought to you by Alternative Lining Technologies. For more information, visit

Charlotte Pordage is Editor of Utility magazine, a position she has held since November 2018. She joined the team as an Associate Editor in October 2017, after sharpening her writing and editing skills across a range of print and digital publications. Charlotte graduated from Royal Holloway, University of London, in 2011 with joint honours in English and Latin. When she's not putting together Australia's only dedicated utility magazine, she can usually be found riding her horse or curled up with a good book.

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