]> 2026-04-15T23:11:05+00:00 Case study:Restoration of Ilabekken brook 500 en Approved Niva Municipality of Trondheim and The Norwegian Public Roads Administration Yes No Yes true Illabecken1896.JPG Illabecken1956.JPG Ilabekken year 1896 (photo from Morten Bergan) Ilabekken year 1956 (photo from Morten Bergan) No 63.430505101785,10.36431312561 Arolam Morten Niva Bergan ,, ,,, 4328 Municipality of Trondheim and The Norwegian Public Roads Administration Ilabekken after restoration 2012 (photo by Morten Bergan) 2008-09-01Z 2454710.5 Illabecken2012.JPG 2005 2453371.5 Complete The Ilabekken brook is a small watercourse in the City of Trondheim. Since the early 20th century the area of the brook has urbanized. Because of the urbanization and loading from the sewage waters there has been loss of habitats and natural biodiversity in the brook. The sea trout (Salmo trutta L.) population had disappeared, in addition to other aquatic organisms and birds. Local actions were taken during 2005-2008 to restore the area. Dedicated plan for the whole Ila valley was done integrating the needs of many different stakeholders. Large construction projects, especially the construction of a new ring road system around the town centre required relocation and upgrading of sewage and water works. The idea of opening the old water course of Ilabekken brook was assessed early in the planning process The aim of the restoration was to improve the whole Ila valley area for recreation and well-being. The object was to reopen the Ilabekken brook and to stop the loading from sewage waters. Also habitat adaptations were made to recover the biodiversity in the brook for example creating more spawning and living places for sea trout and aquatic organisms by adding stones and gravel in the stream. After the restoration the area of the Ilabekken brook has been a popular respite site in the city. The content of phosphorous and other pollutants have decreased in to the natural levels and populations of pollution sensitive species has recovered. Salmonid fish has rehabitated the brook and right after the restoration spawning and reproduction of trout has been also successful. Also macroinvertebrate communities have been re-established after the restorations. Monitoring studies performed by NIVA from the last 5 years have showned rapid recolonization from upstream during the first year. And maintaining this biodiversity will reflect to more pristine streches upstream. This is in accordance with the enhanced water quality, more steady water level (during winter) and habitat improvement measures that have been taken during the restoration project. The restoration of Ilabekken brook has been a good example of good co-operation between different stakeholders. There were open and broad channels of communication with the local population and other actors throughout the planning process. Restoration of Ilabekken brook restoration of ilabekken brook Yes 7000 Ilabekken Brook in the city of Trondheim ilabekken brook in the city of trondheim Trout Salmon Fisheries Flood risk management Habitat and biodiversity Monitoring 2012-11-12T11:18:51Z 2456243.9714236 2013-09-26T11:16:53Z 2456561.9700579 Restoration of Ilabekken brook