Case study:Restoration of Ilabekken brook

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Location: 63° 25' 49.82" N, 10° 21' 51.53" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity, Monitoring
Country	Norway
Main contact forename	Morten
Main contact surname	Bergan
Main contact user ID	User:Arolam
Contact organisation	Niva
Contact organisation web site	http://http://www.niva.org/home/
Partner organisations	Municipality of Trondheim and The Norwegian Public Roads Administration
Parent multi-site project
This is a parent project encompassing the following projects	No

Ilabekken after restoration 2012 (photo by Morten Bergan)

Project summary

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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.

Monitoring surveys and results

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Image gallery

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Ilabekken year 1896 (photo from Morten Bergan)

Ilabekken year 1956 (photo from Morten Bergan)

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Ilabekken Brook in the city of Trondheim WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest Trout, Salmon Dominant hydrology Dominant substrate River corridor land use Urban Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 70007,000 m <br />7 km <br />700,000 cm <br /> Project started 2005 Works started Works completed Project completed 2008/09/01 Total cost category Total cost (k€) Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Loss of biodiversity Hydromorphology Continuity for organisms Biology Fish, Invertebrates Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information