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Melbourne’s drinking water will be injected underground to manage sub-surface water levels while the Metro rail tunnel is being built under the city.
Although the exact volume of water is not yet known, the process will tap into the city’s potable water reserves over the coming years.
Metro contractors have installed a large-scale underground water monitoring and top-up
system to maintain groundwater levels and movement during tunnelling.
Recharge wells and injection points are being installed at Boathouse Drive and Flinders Walk. The injection points are to monitor water levels underground as the tunnel is being dug.
“Installation of these wells involve scanning the area, saw cutting, non-destructive digging, and the use of a drill rig, and takes approximately two weeks to complete,’’ a Metro spokesman said.
Metro Tunnel works in South Yarra. Picture: Sarah MatrayGroundwater monitoring work would affect surrounding buildings or trees, he said.
“All works undertaken as part of the Metro Tunnel Project are designed to minimise impacts on residents and businesses in the surrounding areas.’’
Five new stations and twin 9km rail tunnels are being built under central Melbourne, linking South Yarra to South Kensington. The project, costing more than $11 billion, is due to be completed in 2025.
Monash University civil engineering Professor Jian Zhao said the amount of water required was hard to estimate until tunnelling began next year.
This article first appeared on www.heraldsun.com.au
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