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Amphitheatre Hall 3000

Lowering the water table by deep wells to construct the amphitheatre 3000 of the Cité Internationale in Lyon


Project Type :


Location :

Lyon (69)
Logo entreprise Intrafor


  • For the construction of the last section of the Cité Internationale, lowering the water table in a diaphragm wall anchored in molassic sands
  • Hydrogeological environment: gravelly alluvial clay – highly permeable
  • Area: 3 200 m²
  • Height to lower: 20 metres


  • Complete engineering of lowering the water table by deep wells
  • Definition and realisation of pumping and reinjection wells
  • Complete installation:
    • Pumps
    • Dewatering network
    • Decantation before direct disposal into the Rhône
    • Decantation before disposal into the well
  • Supervision and technical monitoring of lowering the water table: piezometric surveys, monitoring of heights lowered, recording flow rates
  • Remote monitoring of pumping with permanent on-call service
  • After the end of draining: cleaning wells by air-lift
  • Transfer of pumps into the dewatering pits
  • Duration: 24 months