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
Country	Norway
Main contact forename	-
Main contact surname	-
Main contact user ID
Contact organisation	Municipality of Trondheim and The Norwegian Public Roads Administration
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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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. The restoration of Ilabekken brook was 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.

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Catchment and subcatchment

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Site

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Name	Ilabekken Brook in the city of Trondheim
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Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body	Yes
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Protected species present	Yes
Invasive species present	No
Species of interest	Trout, Salmon
Dominant hydrology
Dominant substrate
River corridor land use	Urban
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Project background

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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
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Reasons for river restoration

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Mitigation of a pressure	Loss of biodiversity
Hydromorphology	Continuity for organisms
Biology	Fish, Invertebrates
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Measures

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Monitoring

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