Singapore’s deep tunnel sewerage system (DTSS), Phase 1, won a plaudit last month as “Water Project of the Year” in the Global Water Awards 2009.
Phase 1 of the scheme consists of a 48km long deep tunnel of up to 7.2m excavated diameter and 6m i.d. plus sewers up to 3m i.d., a deep sea outfall and a water reclamation plant.
Feasibility work was done by CH2M Hill and Parsons Brinckerhoff. Design and construction supervision services were by MWH.
The first phase comprises the 38.5km long North Tunnel and 9.6km long Spur Tunnel, which will link to the later South Tunnel (T&TI, October 2007, p23-26).
The project was picked from a shortlist by members of the International Private water Association (IPWA) and International Desalination Association (IDA), and subscribers to Global Water Intelligence and Water Desalination Report.
