The upgrade, which started in December 2013 and completed last month, involved the decommissioning of certain pumping stations to collect and divert all sewage flows through pumping stations 5 to 31.
The decommissioned stations included the temporary pumping stations in Msheireb, PS 4 at Al-Bidda Park project land, PS 15/1 near Hamad Medical City, PS 26T and PS 26 near the Tennis and Squash Complex.
Such reconfigurations would cut costs of operations and maintenance, in addition to reducing the possibility of malfunctions of equipment or rising mains that can impact the life of the surrounding population.



A flow diversion chamber being erected.

In case of emergency, there are 'flow diversion chambers' adjacent to the pumping stations to control the sewage distribution through by allowing the diversion of the flow to the alternative Waste Water Treatment Plants (WWTPs) located in the north, south or west of Doha.
The QR66mn project would correspond to the accelerating development in Msheireb and Bin Mahmoud areas, accommodating the huge amounts of sewage discharge since the new pipes are installed with a better flow capacity.
The new sewerage system was constructed without any conflicts with the present and futuristic major projects; i.e. the project ensured that the sewer lines do not conflict with the road tunnel projects.
The project also enables the construction of the pedestrian tunnels for Al-Bidaa Metro Station by diverting the sewage flow away from the pedestrian tunnels. In addition, it provides future connections that will serve the drainage network for Al-Bidaa Park project.
Micro-tunnelling technique was used for the construction of a new 1,200mm diameter interceptor sewer with an approximate length of 4km, and a new 800mm diameter main sewer with an approximate length of 1.2km.
The project works also included the construction of 200mm and 400mm diameter sewer lines with an approximate length of 320m, the construction of approximately 55 very deep glass-reinforced plastic lined manholes, in addition to the abandonment and elimination of existing sewers and manholes.
Ashghal is currently working on a wide range of infrastructure programmes across the country, including the Expressway Programme which will deliver some of the largest expressways in Qatar, and Drainage Projects Department, which will deliver many sewerage projects.