The Public Works Authority (Ashghal) is in the process of launching QR100bn ($27.4 billion) worth projects in the next five years.
The authority has already started inviting tenders for the key projects from national and international companies.
In September 2012, Ashghal had unveiled 221 projects worth QR50bn. The projects included construction, repair and maintenance of highway structures; road improvements in different municipalities, cleaning projects, construction of commercial centers and complexes and traffic flow improvement.
Nasser Ghaith Al Kuwari, Manager of Ashghal's Drainage Project Department, said the QR10bn sewerage project is aimed at addressing the country's drainage problems for the next 50 years. IDRIS is a world class solution developed by Ashghal to upgrade and accommodate the projected population growth of an additional one million in Doha's oldest area – South catchment.
The major tunneled interceptor sewer and advanced sewage treatment works scheme will meet the long-term demands of hydraulically overloaded conditions, and remove over 30 existing pump stations.
Scheduled to be implemented over the next seven years, the program is a result of studies, which took a comprehensive and integrated approach, whereby various influences on sewage flow were examined, including projected community growth, the condition of the current drainage system and planned development such as Ashghal's Doha Expressway Motorway System and Qatar Rail Company's Metro system. Divided into three main areas of Qatar, the project comprises a conveyance system consisting of 40km of deep main trunk sewer and over 70km of lateral interceptor sewers; one large and approximately 60m deep terminal pump station; New Doha South advanced sewage treatment works with an initial capacity of 500 million liters per day and more than 70km of treated sewage effluent return mains and pump station.
On completion, the project will decommission over 30 ageing pump stations in the inner city area of Doha and replace them with a single large deep terminal pump station 30km outside Doha.
Due to the significant depth below ground of the tunneling works, IDRIS will utilize sub-surface techniques that will minimize the usual disruption associated with utility pipeline work. The only visible signs in the construction of many kilometers of pipeline will be occasional access shafts and work sites.
CH2MHILL has been appointed as the program management consultancy for the project to develop and oversee implementation of IDRIS.