King Island Water Infrastructure Project


TasWater operates reticulated water schemes at Currie and Grassy on King Island.

In August 2014, a decision was made to upgrade the treated water services on King Island, which was supported by the Department of Health and Human Services.

TasWater has committed over $17 million to ensure King Island receives a water supply that meets Australian Drinking Water Guidelines.

The project consists of four main components:

The design and construction of a new water treatment plant (WTP) at the existing WTP plant site in Grassy, as well as reservoirs for the Grassy and Currie areas

The design and construction of approximately 26 kilometres of treated water pipeline to deliver treated water from the new WTP to the towns of Grassy and Currie

The decommissioning and demolition of the existing WTP in Grassy and three reservoirs located on Tower Hill in Currie

A new raw water pump station at the Upper Grassy Dam to pump water to the new WTP in Grassy for treatment.

Upgrades to the Upper Grassy Dam are in planning, but require further assessment. This scope of works will be handled as a separate project.

Forecast growth on King Island has been taken into account and the capacity to expand the WTP has been planned for.

The water supply upgrades will ensure King Island receives a secure and more reliable water supply for the future bringing benefits to residents, businesses and the local tourism sector.

The successful contractors will be announced once contracts are finalised.

Improvement project

Pipelines

The finalised 26km pipeline route starts in Grassy and takes the Old Grassy Road at Lymwood. It will connect into the existing reticulation system in Currie. This revised route has been selected as a result of additional surveying and considerations such as quantity of rock, route length, road reserve width and stakeholder input.

The system will have pressure relief valves and will operate at a similar pressure as is currently observed in both Grassy and Currie. Pipe which is currently stored on King Island will be used for the project and additional pipe will be delivered with the project construction materials.

A flora and fauna survey will be conducted to identify threatened species and their habitats relevant to the project area. The survey results are incorporated into the permitting and design to mitigate issues during the construction phase of the project.

Water treatment plant, reservoirs and pump station

The new WTP will be constructed at the existing Grassy Water Treatment Plant site and will produce treated water which complies with the Australian Drinking Water Guidelines (ADWG). The site was selected for its proximity to Upper Grassy Dam and existing services. The new WTP will utilise Supervisory Control and Data Acquisition (SCADA) systems to constantly monitor the operation of the water treatment system. The system will provide high quality drinking water to existing customers and will significantly reduce the ‘hardness’ of the water experienced by Currie customers.

Two treated water reservoirs will be constructed to provide treated water to the towns of Grassy and Currie. The Grassy treated water reservoir will be situated on Mt Stanley near the telegraph tower, while the Currie treated water reservoir will be situated just outside of Currie on South Road.

A new raw water pump station will be constructed at the Upper Grassy Dam to pump raw water via a new pipeline to the WTP for treatment.

Timing

The project is expected to start in March 2017 with additional surveying. The project is expected to be finalised by mid-2018 with high quality drinking water being supplied to existing customers in Grassy and Currie.

What happens next?

As works progress another community update will be issued to keep you informed of the project.

More information

More information about this project is available from Community Engagement Officer Nikki Brookman on 13 6992 or by emailing communityengagement@taswater.com.au



TasWater operates reticulated water schemes at Currie and Grassy on King Island.

In August 2014, a decision was made to upgrade the treated water services on King Island, which was supported by the Department of Health and Human Services.

TasWater has committed over $17 million to ensure King Island receives a water supply that meets Australian Drinking Water Guidelines.

The project consists of four main components:

The design and construction of a new water treatment plant (WTP) at the existing WTP plant site in Grassy, as well as reservoirs for the Grassy and Currie areas

The design and construction of approximately 26 kilometres of treated water pipeline to deliver treated water from the new WTP to the towns of Grassy and Currie

The decommissioning and demolition of the existing WTP in Grassy and three reservoirs located on Tower Hill in Currie

A new raw water pump station at the Upper Grassy Dam to pump water to the new WTP in Grassy for treatment.

Upgrades to the Upper Grassy Dam are in planning, but require further assessment. This scope of works will be handled as a separate project.

Forecast growth on King Island has been taken into account and the capacity to expand the WTP has been planned for.

The water supply upgrades will ensure King Island receives a secure and more reliable water supply for the future bringing benefits to residents, businesses and the local tourism sector.

The successful contractors will be announced once contracts are finalised.

Improvement project

Pipelines

The finalised 26km pipeline route starts in Grassy and takes the Old Grassy Road at Lymwood. It will connect into the existing reticulation system in Currie. This revised route has been selected as a result of additional surveying and considerations such as quantity of rock, route length, road reserve width and stakeholder input.

The system will have pressure relief valves and will operate at a similar pressure as is currently observed in both Grassy and Currie. Pipe which is currently stored on King Island will be used for the project and additional pipe will be delivered with the project construction materials.

A flora and fauna survey will be conducted to identify threatened species and their habitats relevant to the project area. The survey results are incorporated into the permitting and design to mitigate issues during the construction phase of the project.

Water treatment plant, reservoirs and pump station

The new WTP will be constructed at the existing Grassy Water Treatment Plant site and will produce treated water which complies with the Australian Drinking Water Guidelines (ADWG). The site was selected for its proximity to Upper Grassy Dam and existing services. The new WTP will utilise Supervisory Control and Data Acquisition (SCADA) systems to constantly monitor the operation of the water treatment system. The system will provide high quality drinking water to existing customers and will significantly reduce the ‘hardness’ of the water experienced by Currie customers.

Two treated water reservoirs will be constructed to provide treated water to the towns of Grassy and Currie. The Grassy treated water reservoir will be situated on Mt Stanley near the telegraph tower, while the Currie treated water reservoir will be situated just outside of Currie on South Road.

A new raw water pump station will be constructed at the Upper Grassy Dam to pump raw water via a new pipeline to the WTP for treatment.

Timing

The project is expected to start in March 2017 with additional surveying. The project is expected to be finalised by mid-2018 with high quality drinking water being supplied to existing customers in Grassy and Currie.

What happens next?

As works progress another community update will be issued to keep you informed of the project.

More information

More information about this project is available from Community Engagement Officer Nikki Brookman on 13 6992 or by emailing communityengagement@taswater.com.au