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Upgrading critical town water infrastructure to restore supply reliability and improve potable water quality for the Cobar community.

Cobar Shire Council

Cobar, New South Wales

7km Reticulation Pipeline Replacement (DN100–DN200)

[Project Background]

Renewing Essential Town Water Infrastructure

Cobar Shire Council initiated a town-wide water main renewal program to replace aging cast iron pipelines that had deteriorated over time. The existing network was experiencing recurring blockages, breaks, and discolouration caused by internal deposit build-up.

The upgrade focused on replacing approximately 7 kilometres of pipeline to improve water quality, restore network reliability, and ensure the system could deliver adequate flow capacity for essential services, including firefighting requirements.

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[Scope Of Works]

Operating in Sensitive and Live environments

Replacement of ageing water mains to improve water quality, network reliability, and firefighting capacity for the Cobar community.

Replacement of over 7km of ageing cast iron water mains

Installation of new DN100–DN200 potable water pipelines

Rail crossing works including pipejacking and concrete encasement installation

Network commissioning and integration with existing town infrastructure

Project Technical Snapshot

Key infrastructure upgrades restoring reliability and performance across the Cobar water network.

7km Reticulation Water Main

Pipe Diameter

DN100–DN200

Installation Depth

Up to 3.4m (rail crossing section)

[Outcome / Key Features]

Delivered Critical Regional Network Renewal

Outcome

Replacement of over 7km of aging cast iron water mains across the Cobar township
Installation of new DN100–DN200 reticulation pipeline improving system reliability and flow performance
Laser-guided boring and pipejacking used to safely install pipeline beneath active railway infrastructure
Concrete encasement of pipeline 3.4m beneath the railway line ensuring long-term structural protection

Key Features

Regional water infrastructure upgrade delivered within an operating town network
Restoration works completed across affected streets and service corridors
Community impact minimised throughout construction activities
Immediate improvement in potable water quality experienced by local residents

[Environmental Responsibility]

Water reuse implemented during drought conditions

During construction in drought conditions, water used for pipe disinfection was captured, recycled, and reused through vacuum-jetter combination trucks for dust suppression and jetting activities. This approach reduced water waste while supporting safe construction operations in a water-constrained environment.

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Cobar Reticulation Water Mains Upgrade

7km Reticulation Pipeline Replacement (DN100–DN200)

Renewing Essential Town Water Infrastructure