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Ballarat sewer build uses microtunneling

Ballarat tunnel boring lights around Lake Wendouree.

Central Highlands Water’s Ballarat Sewer Build will commence stage 2 of its duplication in 2023 with microtunnelling beneath Humffray Street South.

For stage two of the Ballarat Sewer Build, a microtunnelling machine will bore a 700 metre, 1200 mm diameter tunnel beneath Humffray Street South, with a pipe to be constructed parallel to the existing sewer infrastructure.

Minor repairs and sewer pipe relining for the existing pipes will co-occur during tunnelling operations.

Stage one of the project saw 1 km of pipe laid beneath the city’s CBD.

The project represents a $25 million investment from utility company Central Highlands Water and will bolster the city’s two largest sewer lines – the Ballarat East and Ballarat South – which were constructed almost 100 years ago.

Since the original pipes were laid, Ballarat’s population has grown by more than five times to 117,000 people.

Once all stages are completed, two large interconnecting sewer lines will run beneath the streets of the city, approximately 6 kilometres in length.

The third and final stage of the project is currently in the planning phase.


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