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Singapore PUB DTSS 2 Contract T-11

Deep Tunnel Sewerage System Phase 2
Bored Tunnels
3.0m & 3.3m
Slurry TBMs Diameter
Client:         Public Utilities Board
Contract:    Design and Build
Location:    Singapore
Period:       2019 - 2024
Excavation Depth
Up to 60m

The Deep Tunnel Sewerage System Phase 2 T-11 includes the design and construction of a 6km South Main Sewerage Tunnel, a 5.5km South Linkway Sewerage Tunnel, fifteen working shafts and related facilities. Two 3.0m diameter slurry TBMs and three 3.3m diameter slurry TBMs. The contract value is S$472.17 million.

The deep tunnels are an integral part of the DTSS, conveying every drop of used water for treatment and channelling it for further reclamation into NEWater. As the backbone of NEWater production, the DTSS ensures the sustainability and resilience of the used water network to facilitate large-scale water recycling in Singapore and contributes to the goal of increasing the overall water recycling rate from 40% to up to 55% of total water demand in the long term. This network of 100 km of deep tunnels and link sewers will connect to the Tuas Water Reclamation Plant, which is expected to be completed in 2025.

T-11 Awards
2022       MOM WSH (SHARP) Award
2021       MOM WSH (SHARP) Award
2020       MOM WSH (SHARP) Award
2019       MOM WSH (SHARP) Award
Related Projects
PUB DTSS_edited_edited.jpg

Construction of bored tunnels with a total length of 5.8 km for PUB DTSS Phase 1

Deep Tunnel Sewerage System Phase 1

A 6m diameter tunnel undersea with a length of 1.6km and twin 2200mm & 1200mm diameter water pipelines connecting Tuas Water Reclamation Plant and Jurong Island 

TWRP Contract 1
Tuas Water Reclamation Plant
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