The Public Works Authority (Ashghal) began the Drainage Tunnel Project in Al Wakra and Al Wukair as part of its plan to develop the drainage network infrastructure. This project involves the excavation of the main drainage tunnel which extends over 13 km.
The Tunnel Boring Machine (TBM) was used for excavation during a field visit to the project site which was attended by Eng. Khalid Saif Al Khayareen, Drainage Networks Projects Department Manager in Ashghal and numerous section heads, along with project supervision consultants and contractors.
Ashghal Launches Excavation Works of Main Drainage Tunnel in Al Wakra and Al Wukair. #QNAhttps://t.co/M9l8a92ket pic.twitter.com/2du7V2avrL
— Qatar News Agency (@QNAEnglish) February 20, 2022
Eng. Al Khayareen stated that the main tunnel can hold drainage flows from the existing and upcoming drainage network located around the Al Wakra and Al Wukair area. These flows will go to Al Wakra and Al Wukair Sewage Treatment Works, with a capacity of 150 million liters per day – positioned to be the first drainage project in Qatar instilled by a Public-Private Partnership (PPP).
He also mentioned that as of now, the Al Wakra and Al Wukair drainage tunnel is among the largest tunnels in Qatar being 13.3 km in total length and 4.5 meters in diameter. Also, the project cost amounts to QAR 859,100,000.
Gravity will be used to operate the main drainage tunnel which extends from Al Khuwaytim to the Birkat Al Awamer. Two TBM’s at a depth of 60 meters underground will be used to perform the project's excavation works.
The TBM uses advanced technology to match with the geological features of Qatar, ensuring efficiency during excavation and maximum safety standards for workers and services or facilities surrounding the tunnel.
To execute deep excavations and perform inspections along with periodic tunnel maintenance, the construction of eight shafts from top to bottom of the tunnel (depths between 50 to 63 meters underground) will be required. These shafts assist with connecting the tunnel with the drainage network located nearby in the future.
The main drainage tunnel has a design life of about 100 years and endorses the best construction practices, applied based on the international standards of health, safety, environment, and sustainability management – in alignment with Qatar’s vision for infrastructure sustainability.
Drainage Networks Branches and Treated Sewage Effluent Lines are the two added packages in the project, both located in Al Wakra and Al Wukair. This coordinated network offers a modern and broad wastewater management solution with low operation and maintenance costs. The project cost with its three packages amounts to more than QAR 1.5 Billion.
The Drainage Network Branches will serve the commercial and residential areas in Al Wakra and Al Wukair. With a total length of 15km, an internal diameter between 400 mm to 2400 mm, and depth between 9 m to 46 m – these small tunnels will be executed using micro-tunneling techniques through 60 shafts. The Qatari Group for Trading and Contracting has implemented this package at QAR 399,808,530.
The Treated Sewage Effluent Lines (TSE) transfer pipe will have a total length of 29 km and a diameter between 600 mm and 1400 mm. The idea is to use these pipes to move treated sewage water from the plant to various water collection areas for irrigation and other purposes.
The network was designed to connect the existing network and implemented projects for full operational flexibility during upcoming operations and maintenance. UCC and Infraroad JV have implemented this package at QAR 298,090,000.
Ashghal began project implementation in November 2020, and it is expected to be completed in the Q2 of 2024.
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Source credit: Ashghal
Image credit: Qatar News Agency
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