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Stormwater tunnel construction starts in Copenhagen

Construction of a new tunnel to prevent flooding in Copehagen has got underway with launch of the tunnel boring machine (TBM) in the Danish capital.

Cowi worked with Greater Copenhagen Utility to design the 580m-long Østerbro Stormwater Tunnel after heavy rain in August 2011 brought unprecedented disruption and damage to the eastern part of the city.

Østerbro

Østerbro launch

NCC and Smet started work on the 13m diamter launch shafts for the tunnellast year

The tunnel is being constructed by NCC and Smet working in joint venture.

The 2.5m diameter tunnel, which will be constructed at between 8 and 13m below ground level, will allow up to 12m3/s of rainfall to be discharged into the harbour basin.

Construction of the Østerbro tunnel is expected to be completed early near year, however, according to Cowi project manager Leo Lund Mathiasen, projects of this type are likely to become more common. “When severe cloudbursts hit densely built cities some of the water has to go underground and be led to the sea,” he said. “As a consequence, we will see many more stormwater tunnel constructions in the future.”

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