The Port of Gothenburg is currently working with the Swedish Transport Administration on the construction of a wetland for wildfowl at Torsviken. The wetland is a way of reinstating an area that has been used for almost 40 years as a deposition site for dredging spoils. The project is expected to be completed in 2020.
Ever since the 1970s, the Port of Gothenburg has had a permit to deposit polluted dredging spoils at Torsviken, close to the port on Hisingen. The material has mainly been placed in an embanked area at the southern end of the bay. The permit expired in 2009. The port now wants to cover the spoils and, as far as possible, reinstate the area to its original condition with a rich variety of wildlife and birdlife.
Before the wetland can be created, reinforcement work needs to be carried out and the dredging spoils will then need to be covered with clean material. This is where the new Marieholm Tunnel comes into the picture. The construction of a tunnel in central Gothenburg involves the excavation of large volumes of clay. This glacial clay can be used to cover the polluted land and by doing so create a protective barrier.