Currently, wastewater from Lyttelton, Governors Bay and Diamond Harbour is treated at wastewater treatment plants in each of the townships before being discharged through outfall pipelines into Lyttelton Harbour.
Under the new scheme untreated wastewater from the townships of Governors Bay and Diamond Harbour will be carried through the submarine pipelines to a new pump station on Simeon Quay in Lyttelton.
It will then be piped through the Lyttelton Tunnel to the Ferrymead pump station and onto the Bromley wastewater treatment plant, where it will be treated. From there it will be discharged out to sea through the Christchurch Ocean Outfall.
Full details on CCC website