Kangaroo Island's new seawater desalination plant

Share on Facebook Share on Twitter Share on Linkedin Email this link

Updated desalination plant information

New desalination plant location and design

The new desalination plant site is being prepared as per the Development Application granted on 16 February 2022. The approved Development Application provided flexibility in design and siting of the desalination plant as conceptual plans evolve through to final design, within a defined boundary on the site near Hog Bay Road. The refinement from concept to detailed design has resulted in the following changes:

  1. The distance to the furthest edge of the site has been refined to approximately 195 metres resulting in an adjustment to the southern boundary of the plant site of approximately 10 metres. This means the built forms are moved approximately 50 meters south of the originally proposed location. This design balances geotechnical constraints with cost and constructability considerations, while enabling the building footprint to be retained and not to push further north towards neighbouring residents and remains within the site envelope shown in the Development Application.
  1. The floor level of the finished desalination plant will be at approximately 62.7 metres above sea level. The DA noted the elevation would be within approximately 1 metre of the original 61.15 metre elevation.

The plant will still be cut into the natural curve of the hill and the elevation is within the scope provided in the Development Application. This results in a difference of 3.4 metres between the highest point on Hog Bay Road and the final finished floor level of the plant building, which is consistent with the side elevation shown to Council recently, which noted a difference of up to 4 metres.

Additional hard and soft landscaping will provide additional screening.

Noise and acoustic treatments

Noise modelling undertaken to date predicts that noise output during operation will be minimal and will comply with the requirements of the Environment Protection Authority (EPA).

The desalination plant building will be lined with acoustic insultation that is deemed ‘fit for purpose’ by an acoustic treatment specialist. They have considered all factors related to the plant, including machinery, proximity to residential areas, existing noise modelling and predicted noise outputs. Details of the acoustic treatments will be shared when they have been finalised.

The noise output from the dry well pump will also need to comply with the EPA noise limits for this area and noise attenuation measures will be implemented to ensure that compliance is achieved.

Professional noise monitoring will be completed once the desalination plant is in operation to ensure it complies with all requirements, and to inform any remediation in the event of a non-compliance.

Maintaining the marine environment

The marine infrastructure for the new desalination plant will be built adjacent to the existing Penneshaw Desalination Plant’s infrastructure which has been in place for more than 20 years, with no evidence of impact on marine life in the area.

As a result of the new infrastructure being designed in line with contemporary practices and more modern technologies, it is expected that there will continue to be no detrimental impact to marine life in this location.

Ongoing monitoring of the marine environment to meet criteria set by the EPA is a condition of the Development Application, as well as the facility’s operational licences.

Landscaping, fencing and lighting

Excess soil has been deposited adjacent to our desalination plant site with permission of Kangaroo Island Council and they will determine the ultimate use of this area.

As detailed in the Development Application, a landscaping plan will be developed in conjunction with Council and the local community, to reduce the visual impact for the surrounding area.

Security fencing plans will be available on the completion of detailed design and will be shared with the local community.

To enable local input into the facility’s final design, an eight-person working group comprised of local residents and community representatives, was formed and has assisted with key selections for building and fencing materials and colours, and landscape design and screening vegetation.

Construction

John Holland Guidera O'Connor (JHGO) Joint Venture, who are our construction partner, has provided us with a copy of their Construction Environmental Management Plan (CEMP), which can be found here.


The project in a nutshell

We are constructing a new seawater desalination plant and distribution network on Kangaroo Island.

This plant will provide additional water security for the island, improve water quality management to ensure ongoing compliance to Australian Drinking Water Guidelines and expand the network to new customer areas with first water from the plant targeted to be delivered to residents in American River, Baudin Beach, Island Beach and Sapphiretown by the end of 2022.

The new desalination plant will also provide an additional climate independent drinking water supply, boost economic activity, and improve bushfire resilience.

Water produced from the new plant will supplement the existing Penneshaw facility and the Middle River Reservoir, supplying the Island through a connected drinking water network.

A new pipeline will have capacity to service residents in Baudin Beach, Island Beach, Sapphiretown and American River. Our engagement with these communities will explore opportunities and interest in connecting to this new drinking water supply with consultation informing where any new drinking water networks are laid.

To aid firefighting capabilities, we plan to install fire plugs every two kilometres along the trunk main and every 400 metres along the new pipelines in the new communities we aim to supply as part of this project. These fire plugs will allow access by the Country Fire Service for firefighting purposes.

The new desalination plant will produce as much as 80% of the Island’s current water requirements. This will allow for growth and an expected increase in demand.

Updated desalination plant information

New desalination plant location and design

The new desalination plant site is being prepared as per the Development Application granted on 16 February 2022. The approved Development Application provided flexibility in design and siting of the desalination plant as conceptual plans evolve through to final design, within a defined boundary on the site near Hog Bay Road. The refinement from concept to detailed design has resulted in the following changes:

  1. The distance to the furthest edge of the site has been refined to approximately 195 metres resulting in an adjustment to the southern boundary of the plant site of approximately 10 metres. This means the built forms are moved approximately 50 meters south of the originally proposed location. This design balances geotechnical constraints with cost and constructability considerations, while enabling the building footprint to be retained and not to push further north towards neighbouring residents and remains within the site envelope shown in the Development Application.
  1. The floor level of the finished desalination plant will be at approximately 62.7 metres above sea level. The DA noted the elevation would be within approximately 1 metre of the original 61.15 metre elevation.

The plant will still be cut into the natural curve of the hill and the elevation is within the scope provided in the Development Application. This results in a difference of 3.4 metres between the highest point on Hog Bay Road and the final finished floor level of the plant building, which is consistent with the side elevation shown to Council recently, which noted a difference of up to 4 metres.

Additional hard and soft landscaping will provide additional screening.

Noise and acoustic treatments

Noise modelling undertaken to date predicts that noise output during operation will be minimal and will comply with the requirements of the Environment Protection Authority (EPA).

The desalination plant building will be lined with acoustic insultation that is deemed ‘fit for purpose’ by an acoustic treatment specialist. They have considered all factors related to the plant, including machinery, proximity to residential areas, existing noise modelling and predicted noise outputs. Details of the acoustic treatments will be shared when they have been finalised.

The noise output from the dry well pump will also need to comply with the EPA noise limits for this area and noise attenuation measures will be implemented to ensure that compliance is achieved.

Professional noise monitoring will be completed once the desalination plant is in operation to ensure it complies with all requirements, and to inform any remediation in the event of a non-compliance.

Maintaining the marine environment

The marine infrastructure for the new desalination plant will be built adjacent to the existing Penneshaw Desalination Plant’s infrastructure which has been in place for more than 20 years, with no evidence of impact on marine life in the area.

As a result of the new infrastructure being designed in line with contemporary practices and more modern technologies, it is expected that there will continue to be no detrimental impact to marine life in this location.

Ongoing monitoring of the marine environment to meet criteria set by the EPA is a condition of the Development Application, as well as the facility’s operational licences.

Landscaping, fencing and lighting

Excess soil has been deposited adjacent to our desalination plant site with permission of Kangaroo Island Council and they will determine the ultimate use of this area.

As detailed in the Development Application, a landscaping plan will be developed in conjunction with Council and the local community, to reduce the visual impact for the surrounding area.

Security fencing plans will be available on the completion of detailed design and will be shared with the local community.

To enable local input into the facility’s final design, an eight-person working group comprised of local residents and community representatives, was formed and has assisted with key selections for building and fencing materials and colours, and landscape design and screening vegetation.

Construction

John Holland Guidera O'Connor (JHGO) Joint Venture, who are our construction partner, has provided us with a copy of their Construction Environmental Management Plan (CEMP), which can be found here.


The project in a nutshell

We are constructing a new seawater desalination plant and distribution network on Kangaroo Island.

This plant will provide additional water security for the island, improve water quality management to ensure ongoing compliance to Australian Drinking Water Guidelines and expand the network to new customer areas with first water from the plant targeted to be delivered to residents in American River, Baudin Beach, Island Beach and Sapphiretown by the end of 2022.

The new desalination plant will also provide an additional climate independent drinking water supply, boost economic activity, and improve bushfire resilience.

Water produced from the new plant will supplement the existing Penneshaw facility and the Middle River Reservoir, supplying the Island through a connected drinking water network.

A new pipeline will have capacity to service residents in Baudin Beach, Island Beach, Sapphiretown and American River. Our engagement with these communities will explore opportunities and interest in connecting to this new drinking water supply with consultation informing where any new drinking water networks are laid.

To aid firefighting capabilities, we plan to install fire plugs every two kilometres along the trunk main and every 400 metres along the new pipelines in the new communities we aim to supply as part of this project. These fire plugs will allow access by the Country Fire Service for firefighting purposes.

The new desalination plant will produce as much as 80% of the Island’s current water requirements. This will allow for growth and an expected increase in demand.

Ask the project team a question

We are working together with the Kangaroo Island community as we start planning to construct a new 2 megalitre per day seawater desalination plant to be built in the vicinity of the existing plant at Penneshaw.  The new desalination plant will supplement the existing Penneshaw facility and the Middle River Reservoir, supplying Kangaroo Island through a connected pipeline network.

Local community members are invited to join to ask us questions and tell us what's most important to them

loader image
Didn't receive confirmation?
Seems like you are already registered, please provide the password. Forgot your password? Create a new one now.
  • Share on Facebook Share on Twitter Share on Linkedin Email this link

    Just to clarify, I understand the pipeline will be underground, but will it be layed under the road itself or along side of the road? Cheers

    Kiholidays asked about 1 year ago

    Hi KIholidays

    Thanks for the follow up question. 

    Optimally the pipeline would be laid in the road verge, however where laying in the road verge has any impact upon the native vegetation in the area, the pipeline will be laid within the road itself.

    We are looking to minimise our impact on the local native vegetation and have undertaken assessments along the route. These assessments will be fed into the design process that will then identify where exactly, across the entire route, where the pipe needs to be laid.

    Cheers

    Aaron - SA Water

  • Share on Facebook Share on Twitter Share on Linkedin Email this link

    Hi, Will the pipeline be layed under the road or along side?

    Kiholidays asked about 1 year ago

    Hi Kiholidays

    The pipe that connects the new desalination plant in Penneshaw to the Middle River-Kingscote network will be an underground pipeline, just as the reticulation networks in Baudin Beach, Island Beach, Sapphiretown and American River will be.

    Kind regards

    Aaron - SA Water

  • Share on Facebook Share on Twitter Share on Linkedin Email this link

    Hi there, I note that the project includes a pipeline connecting the Penneshaw supply with the Kingscote-Middle River supply. While Baudin Beach, Island Beach, Sapphiretown and American River are named, the route of the pipeline suggests it will pass Nepean Bay - has any thought been given about whether the pipeline will be able to supply the community at Nepean Bay in the future?

    Daniel Garland asked over 1 year ago

    Hi Daniel.

    Thanks for your question. At this stage, the scope of the project is to look to provide new connections to property owners in Baudin Beach, Island Beach, Sapphiretown and American River. Engagement with these communities will look to explore opportunities and interest in connecting to this new, safe and affordable drinking water supply. 

    We are also talking with neighbours of the new pipeline, connecting the new desalination plant to the Middle River-Kingscote network. 

    We are open to discuss connection opportunities with property owners in Nepean Bay and would suggest to anyone who is keen to discuss this, to make contact with me via email - aaron.glossop@sawater.com.au or via the project email kinewdesal@sawater.com.au.

    Kind regards

    Aaron Glossop

  • Share on Facebook Share on Twitter Share on Linkedin Email this link

    I live on Cape Willoughby Rd, opposite the golf course... is it possible for my cottage to be connected to mains water? Thank you

    Karen Robb asked over 1 year ago

    Hi Karen

    Thanks for your question. At this stage, the scope of the project is to look to provide new connections to property owners in Baudin Beach, Island Beach, Sapphiretown and American River. Engagement with these communities will look to explore opportunities and interest in connecting to this new, safe and affordable drinking water supply.

    Any new connection within the Penneshaw reticulated network will require a standard connection request through our new connections team.  Please refer to our standard connections policy - Standard (sawater.com.au) for all you need to know.

    Kind regards

    Aaron Glossop

  • Share on Facebook Share on Twitter Share on Linkedin Email this link

    Your website under the heading of “Charges if you are Not connected to the Water Network States and I quote “If your property is ABLE to be connected to a water main,you are billed a rating on abuttal charge.This charge applies even if you are not connected”. This implies to me that if a water main is running past my house and I elect not to be connected I will be charged. What will that charge be?.

    George Bateman asked over 1 year ago

    Hi George

    Thanks for your question.

    The 2020-21 annual charge for the supply of our safe, reliable and affordable water to your home is $67.85 per quarter, $271.40 per year. 

    As the mains network is designed to meet the water service needs of each property for your benefit and future owners, this charge applies whether your property is connected to the network or not.

    With statewide pricing in place across South Australia, all residential customers pay the same price for water, regardless of where they live. 

    Drinking water prices across South Australia include:

    1. a fixed charge for water supply
    2. variable water use price – the more you use, the more you pay.


    Kind regards

    Aaron Glossop

    SA Water

Page last updated: 15 Jun 2022, 09:15 AM