Mangakino sewer network upgrade

Project overview

The Mangakino wastewater system is being upgraded with an extensive relining programme.

The relining involves inspecting the existing pipes and using robotic cutters to remove any sharp objects like roots before they are relined with an expanding polyvinyl chloride (PVC) pipe. Because the relining smooths over areas that previously would have caught items that had been flushed, it means blockages are greatly reduced. The relining also prevents water from heavy rain events seeping into the pipe system and inundating the wastewater treatment plant.

The PVC pipe has a rated life span much longer than previously used materials and the relining process is both faster than trenching and relaying pipes, as well as providing a 50 per cent cost saving.

The project is expected to be completed by November 2020, weather permitting, by which time the entire Mangakino sewer network of over 18km will have been checked and upgraded where needed.