Colac

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The Colac area has a population of approximately 14,300, projected to increase to around 24,000 by 2065.

The Colac water supply system currently services an annual demand of around 3,000 million litres per year and includes a range of industrial and agricultural uses.



Our challenge

Connection of the Colac system to the Geelong, Golden Plains, Bellarine and Surf Coast system in 2017 means that Colac’s water supply is secure for at least the next 30 years.

Even under a worst-case scenario of high climate change and high population growth, we can reliably meet the water needs of our Colac customers until at least 2054.


Our response icon

Our response

The long-term option to maintain Colac's water security is most likely to be optimisation of the existing connection to the Geelong, Golden Plains, Bellarine and Surf Coast system. This connection will continue to provide flexibility and reliability for Colac when current arrangements can no longer maintain levels of service.

In the meantime, our efforts in the next five years will focus on ensuring that we are continuing to make best use of our available water sources.


In the next 5 years:

Smarter Water Use icon
Smarter water use
  • C1 Work with customers to help them use water more efficiently
  • C2 Build a new underground pipeline to connect Birregurra to the Colac system


Integrated water management icon
Integrated water management
  • C3 Work with Colac Otway Shire to progress localised integrated water management opportunities

In the next 50 years:


Find more water

Continue to support uptake of alternative water sources.

Monitor the requirement for an upgrade, most likely to be an enhancement to the existing connection to the Geelong, Golden Plains, Bellarine and Surf Coast system.

Integrated water management icon
Integrated water management
Adopt an integrated water management approach when planning new urban development, in partnership with the Colac Otway Shire.

Continue to work with customers to encourage sustainable water use, including through innovative technologies.



During drought or emergency:

Find more water icon
Find more water
Further utilise the connection to the Geelong, Golden Plains, Bellarine and Surf Coast system to increase water supply

Smarter Water Use icon
Smarter water use
Implement water restrictions to curb demand if total system storage levels fall below defined trigger points

What you can expect:


The status of the Colac system provides an illustration of the dynamic process of monitoring and responding to water security over time. Prior to the construction of the pipeline connection to the Geelong, Golden Plains, Bellarine and Surf Coast system, Colac’s level of service was at risk because of limitations in our infrastructure. With the benefit of the upgrade, the Colac system is now secure for many years to come.

Our actions in the next five years reflect Colac’s current high level of water security. As a result, we expect water restrictions will be very rare in Colac over the next five years (<1%, or 3 weeks out of 5 years).


The Colac area has a population of approximately 14,300, projected to increase to around 24,000 by 2065.

The Colac water supply system currently services an annual demand of around 3,000 million litres per year and includes a range of industrial and agricultural uses.



Our challenge

Connection of the Colac system to the Geelong, Golden Plains, Bellarine and Surf Coast system in 2017 means that Colac’s water supply is secure for at least the next 30 years.

Even under a worst-case scenario of high climate change and high population growth, we can reliably meet the water needs of our Colac customers until at least 2054.


Our response icon

Our response

The long-term option to maintain Colac's water security is most likely to be optimisation of the existing connection to the Geelong, Golden Plains, Bellarine and Surf Coast system. This connection will continue to provide flexibility and reliability for Colac when current arrangements can no longer maintain levels of service.

In the meantime, our efforts in the next five years will focus on ensuring that we are continuing to make best use of our available water sources.


In the next 5 years:

Smarter Water Use icon
Smarter water use
  • C1 Work with customers to help them use water more efficiently
  • C2 Build a new underground pipeline to connect Birregurra to the Colac system


Integrated water management icon
Integrated water management
  • C3 Work with Colac Otway Shire to progress localised integrated water management opportunities

In the next 50 years:


Find more water

Continue to support uptake of alternative water sources.

Monitor the requirement for an upgrade, most likely to be an enhancement to the existing connection to the Geelong, Golden Plains, Bellarine and Surf Coast system.

Integrated water management icon
Integrated water management
Adopt an integrated water management approach when planning new urban development, in partnership with the Colac Otway Shire.

Continue to work with customers to encourage sustainable water use, including through innovative technologies.



During drought or emergency:

Find more water icon
Find more water
Further utilise the connection to the Geelong, Golden Plains, Bellarine and Surf Coast system to increase water supply

Smarter Water Use icon
Smarter water use
Implement water restrictions to curb demand if total system storage levels fall below defined trigger points

What you can expect:


The status of the Colac system provides an illustration of the dynamic process of monitoring and responding to water security over time. Prior to the construction of the pipeline connection to the Geelong, Golden Plains, Bellarine and Surf Coast system, Colac’s level of service was at risk because of limitations in our infrastructure. With the benefit of the upgrade, the Colac system is now secure for many years to come.

Our actions in the next five years reflect Colac’s current high level of water security. As a result, we expect water restrictions will be very rare in Colac over the next five years (<1%, or 3 weeks out of 5 years).


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Page last updated: 13 January 2022, 11:44