Draining the desert

Design, construction and operation of the Musaimeer pumping station and outfall tunnel

Peter Haas

Despite its low annual rainfall, the city of Doha needs a rainwater drainage solution. (Image: PORR AG)

In October 2017, a joint venture comprising Hamad Bin Khalid Contracting Company W.L.L. (HBK) and PORR Qatar Construction W.L.L. was awarded by Ashghal PWA to construct the Musaimeer pumping station and corresponding outfall tunnel. The system will be constructed south of Doha, near the international airport, within four years.

With an annual rainfall of less than 100mm and only 20 days of rain per year, Qatar is one of the driest regions in the world. However, the rare rainfall events can be extremely intense. A concept for fast and reliable surface and rainwater drainage was developed, having in mind the upcoming FIFA World Cup in 2022. In addition to extending the local network and the Abu Hamour Tunnel, which has already been completed, the Musaimeer pumping station and the corresponding outfall tunnel form a major part of this concept.

The pumping station itself will be around 80x40m with a maximum depth of approximately 38m. The roughly 10km outfall tunnel will run from the pumping station on-shore into the sea, ending in a risershaft in the Persian Gulf. The tunnel will be excavated towards the sea using an Earth Pressure Balance (EPB) TBM. At the same time, the shaft will be erected off-shore, prior to arrival of the tunnel boring machine. Completion of the project is scheduled for autumn 2021.

Project data

Employer Public Works Authority (Ashghal)
Contractor Joint venture comprising Hamad Bin Khalid Contracting Company – PORR Qatar Construction
Project type Civil engineering . Hydraulic engineering
Project scope Design and construction of the pumping station as an extension of the Abu Hamour tunnel including outfall tunnel and diffuser field
Start of construction November 2017
End of construction November 2021
Country Qatar

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