Case study:Restoration in Bognelva

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Location: 69° 57' 7.06" N, 22° 23' 10.31" E

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Project overview

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Status	Complete
Project web site
Themes
Country	Norway
Main contact forename	Knut Aune
Main contact surname	Hoseth
Main contact user ID
Contact organisation	The Norwegian Water Resources and Energy Directorate (NVE)
Contact organisation web site	http://www.nve.no
Partner organisations	NMBU and NaturRestaurering
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Massive reconstruction of the lower 3,5 km of the Bogn river, including canalization and structural modifications to the main river and side channels the last 100 years had negative impact on landscape, biodiversity and productive populations of anadromous fish. The disappearance of fish led to local interests among fishermen, farmers and landowners to restore the river. Since numerous restoration measures were planned and implemented. The main aims was to restore the natural dynamics and diversity of the river system and its interactions with the surrounding valley. Since 2005, side channels and tributaries have been re-opened and re-established, habitat improvements such as pools and channels have been re-created, and scientific studies have been initiated for investigating the before and after situation for fish populations and biodiversity. Importantly, a strong and active local engagement has secured the success of this project.

Monitoring surveys and results

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Habitat diversity, bird species, fish densities are included. Improved fish density and catchment.

Lessons learnt

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Make a good story and go for it. Involvement and local engagement is the key to success.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Bognelva WFD water body codes 211.8Z WFD (national) typology WFD water body name Bognelva Pre-project morphology Channelled river Reference morphology Desired post project morphology Meandering river Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest different fish species Dominant hydrology Dominant substrate River corridor land use 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) 35003,500 m <br />3.5 km <br />350,000 cm <br /> Project started 2003 Works started Works completed Project completed Total cost category Total cost (k€) 8080 k€ <br />80,000 € <br /> Benefit to cost ratio Funding sources Norwegian Water Resources and Energy Directorate (NVE) Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design NVE Knut Aune Hoseth Stakeholder engagement and communication Langfjordbotn JFF Bjørn O. Dønnum Works and works supervision NMBU / NaturRestaurering Jonathan E. Colman Post-project management and maintenance NVE Monitoring NMBU / Naturrestaurering Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology The channelled river led to disapperance of fish Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Morphological diversification, Restoration of side channels, Reopening of side channels, Creation of pools, habitat improvements Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Local public awareness 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 Channel pattern/planform Yes Yes Yes No No Improvement Quantity & dynamics of flow Yes Yes Yes No No Improvement Structure & condition of riparian/lake shore zones Yes Yes Yes No No Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish Yes Yes No Yes No Improvement 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 Birds Yes Yes Yes No No Inconclusive Increased recreation No Yes Yes No No Improvement Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://https://www.nina.no/archive/nina/PppBasePdf/temahefte/042.pdf Colman, J.E. et al. 2010. Restaurering av Bognelva, Langfjordbotn. NINA Special Report, pp. 83-87. Supplementary Information Edit Supplementary Information