As an island state, Singapore obtains a significant portion of its water supply from state-of-the-art rainwater and used water treatment. Back in the 1990s, Singapore's National Water Agency, PUB launched a massive project to strengthen the nation's water security and when completed, the Deep Tunnel Sewerage System (DTSS) will include a total of approximately 200km of newly built sewers running up to 60m deep underground. It is designed to meet Singapore's long-term needs for used water collection, treatment, and reclamation.
Multiple TBM from Herrenknecht have completed 49km of sewer excavation under Singapore
This underground system collects used water from homes and industries and conveys it entirely via gravity to state-of-the-art water reclamation plants without the need for additional pumping stations....
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