French and Danish firms to build Valby ‘cloudburst tunnel’

Aerial view of Frederiksberg Denmark Aerial view of Frederiksberg Denmark (Image: dennisjacobsen via AdobeStock - stock.adobe.com)

Two contractors working in joint venture have been selected to build the Valby cloudburst tunnel under a contract worth DKK 490 (US$71.3 million).

The tunnel is designed to protect the western part of Frederiksberg, near Copenhagen, from flooding during cloudbursts and heavy rainfall.

Danish contractor MT Højgaard Danmark and French company Eiffage will build the project for Greater Copenhagen utility company HOFOR and local utility firm Frederiksberg Forsyning.

The underground tunnel will be 2,380m long and will be constructed as a drilled tunnel with an internal diameter of 3.4m. The tunnel will have the capacity to handle so-called 100-year rain events and will support the sewage network by collecting overflow water from the sewer system until the water can be pumped on to the sewage treatment plant.

In the cases of extreme rain, the water can also be conveyed directly into Kalveboderne, a body of water to the south of Copenhagen.

Construction is due to start in 2024 with the establishment of four construction sites and shafts and the project is scheduled for handover in 2028.

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