Dewatering system

Airport excavation

Distance drawdown

Time drawdown

• Clients
  • Dubai Department of Civil Aviation
• Main contractors
  • Al Naboodah Construction LLC
• Consultants
  • Dar Al-Handasah
• WJGL roles
  • Dewatering contractor
• Project reference
  • J

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The new Terminal 3 at Dubai International Airport is built below ground with aircraft stands above. The construction works for the terminal required an excavation of plan size 420,000m2 by 25m depth immediately adjacent to the existing terminal and control tower in water bearing granular soils. Dewatering was carried out by WJ using a perimeter ring of deepwells which was extended progressively to suit the available access and phasing of the works. The design of the dewatering system was undertaken using a 3-D time dependent finite element hydro-geological model which was calibrated using data from the progressive start-up of the dewatering system. Output from the model was used to ensure timely start-up of wells to meet the drawdown requirements for the phasing of the works.

Further information
Design and operation of a large dewatering system in Dubai C P Botha, T O L Roberts and A Welch, 2009 17th International Conference on Soil Mechanics and Geotechnical Engineering, Alexandria, Egypt, 5–9 October

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