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  Tunneling in the Modern Dubai for Flood Control Now and for the Next Century

  As part of its on-going efforts to build integrated infrastructure that ensures public safety and satisfaction, in line with other world-class cities in the world, Dubai Municipality (DM) launched the multi-billion dollar Deep Tunnel Stormwater System (DTSWS) project to capture and convey storm and ground water flows from over 490 km2 of new urban development areas, including the new Al Maktoum International Airport (DWC) and the EXPO 2020 site. Flows conveyed by the DTSWS will be discharged to the Gulf through a 36 m3/s pump station and sea outfall and an overflow structure at the shoreline. The project will also provide an emergency outfall for the Treated Sewage Effluent (TSE) tank at Jebel Ali Sewage Treatment Plant (JASTP) in case of failure of the TSE pumping station.DM determined to procure the work via the Design-Build (DB) method and selected MWH, now part of Stantec, as the Owner’s Engineer. In this role, MWH has the responsibility for Feasibility Studies, Preliminary Design, Pre-qualification of the DB contractors, Tender Evaluation, Final Design Review and Construction Supervision.The overall project is comprised of three contract packages: Package 1 – Terminal Pumping Station and Sea Outfall, Package 2 – Main Tunnel, Shafts and Connection Chambers, Package 3 – Collector Pipelines and Detention Pond. This paper focuses on Package 2.At the time of preparation of this paper, Package 2 tendering and tender evaluation is complete, with contract award by DM and start of work on 1 October 2017. Evaluation of tender submissions was based on both technical and commercial submissions. This paper discusses the preliminary design completed by MWH, tenderer pre-qualification and tender evaluation.

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