Abu Dhabi completes 41km sewer tunnel

Tunnel part of $1.5bn Strategic Tunnel Enhancement Programme (STEP)

Picture for illustrative purposes only
Picture for illustrative purposes only

One of the largest underground sewerages in the world, which is being built in Abu Dhabi at a cost of AED5.7bn ($1.5bn), is on track to be completed by November 2015.

The Strategic Tunnel Enhancement Programme (STEP) built by the Abu Dhabi Sewerage Services Company (ADSSC) celebrated the completion of the excavation of the 41-kilometre-long sewerage tunnel, reports Khaleej Times.

It is one of the three main components of the drainage project. The other two components, link sewers and the excavation of the pumping station, are 26% complete. There are several sub-components, said Shahzad Orakzai, project manager of STEP.

“The project is on budget and on track for completion by November 2015,’’ said Orakzai.

The Step is one of the longest gravity-driven sewerage tunnels in the world and features three key components: a 41-kilometre deep sewerage tunnel, 43 kilometres of link sewers with smaller diameter, and a pumping station adjacent to the Al Wathba Independent Sewerage Treatment Plants.

At Al Wathba, where the sewage will be collected for recycling, Abu Dhabi is building the world’s biggest pumping station with the capacity to recycle 1.8 million cubic metres of waste water a day. The tunnel will be linked with the existing sewerage and link sewers to drain out the waste water, Orakzai said.

Abu Dhabi’s sewerage is about 9,000 kilometres long with 300 pumps recycling the waste water.


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