Cowi and CPG Corporation have been awarded the contract for the design work on a deep sewer tunnel for Singapore’s national water agency, PUB.
Under the deal with Leighton Asia, the joint venture will design a 7.9km long section for Contract T-09 of the Deep Tunnel Sewerage System (DTSS) Phase 2.
cowi dtss2 map pub
Singapore is building the DTSS Phase 2 to meet its long-term needs for wastewater collection, treatment, reclamation and disposal. The deep tunnels in Phase 2 will connect to the existing deep tunnels in Phase 1, completed in 2008, serving the eastern part of Singapore and the public sewer network to create one seamless integrated system. The whole of Singapore will be served by the DTSS when the 40km of tunnels in Phase 2 are complete by 2025.
In addition to the design of the 6m internal diameter tunnel itself, the contract includes shafts, hydraulic structures and other facilities associated with the sewerage conveyance system. Cowi and CPG will work closely with Leighton Asia to devise solutions to these challenges, including investigating options to combine temporary work shafts to minimise land take and designing ground improvement measures to reduce any impact on adjacent structures.
“This is a hugely significant contract for Cowi,” said Cowi executive director for the tunneling business in the UK and SE Asia Andy Sloan. “We are extremely pleased to be working with Leighton on this technically challenging project. The win sees us expanding from our base in Hong Kong into the Singapore market where we feel we can bring great value to contractors and clients alike.”