Tamar Estuary River Health Action Plan Project

These improvements include:

• Upgrades of existing and construction of new pump stations to increase pumping capacities
• Constructing new network storages to reduce overflows
• Building additional pipelines to transfer greater flow volumes.

The forecast benefits include:

• A reduction in combined sewage and stormwater overflow volumes in an average rainfall year
• Reducing the presence of human waste-related bacteria concentrations in Tamar Estuary Zone 1 in an average rainfall year.

Esplanade/St John Street pipeline upgrade – in November 2022 we completed construction of our new pipeline section and new connections. 

Margaret Street Diversion Project - During September 2023 we completed the final phase of major construction by lifting the large concrete lid into place for this new underground diversion chamber at our Margaret Street Pump Station.

The chamber is now connected to our existing sewer system and will help divert sewage and stormwater flows away from kanamaluka/Tamar estuary.  The diversion chamber will improve the way we manage the flow of sewage and stormwater to the Margaret Street Pump Station and onto the Ti Tree Bend Sewage Treatment Plant.

New Pipeline Project – This transformative pipeline project, which is one of the largest infrastructure projects of its type in the southern hemisphere, will increase our capacity to transfer sewage and stormwater, significantly reducing the frequency and volume of overflow events.

Construction involves installing a large pipeline which will be laid up to 40 metres under the estuary riverbed.  In October we began drilling activities near at our Ti Tree Bend Sewage Treatment Plant at Invermay and Valley Street, Trevallyn.

We’ve also established our construction site along the western foreshore where we are having the large pipes delivered and stored.

New Margaret Street Pump Station Upgrade Project – In September we began works on this project.  The project will involve increasing the pumping capacity (by installing new pumps) from Margaret Street to our Ti Tree Bend Sewage Treatment Facility.