Case study:Built Kjøsnesbekken in the river Stjørdalselva

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Location: 63° 27' 36.50" N, 11° 11' 35.52" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydropower, Hydromorphology, Monitoring
Country	Norway
Main contact forename	Arne
Main contact surname	Jørgen and Kjøsnes
Main contact user ID	User:Kasvio
Contact organisation	NVE (Norwegian Water Resources and Energy Directorate)
Contact organisation web site	http://www.nve.no/en/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Kjøsnesbekken was built with gravel (photo: Arne Jørgen)

Project summary

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NVE constructed a complete new river side channel in an old river course next to the river Stjørdalselva in Norway. A unique collaboration between NVEs civil engineers, biologists and construction workers resulted in a 700m long and 2-5m wide miniature river containing all necessary habitats for salmonid fish.

It was built to compensate for the loss of suitable habitats in the main river due to human impacts such as railroad construction, hydropower regulation, removal of gravel from river bed, road building, flood protection work etc. Detailed planning with accurate calculations of slope, size of weirs, length of ponds, suitable water velocity on spawning grounds and use of correct substrate were done to ensure the new river could host fish of all cohorts.

Depth varies between 0,2 to 0,5m in the more rapid parts downstream the weirs. In the three resting ponds there are areas as deep as 1,5 m where fish can take shelter during periods of low water flows. Water flow varies between 150 – 800 l/sec depending on the flow in the main river. The inlet to the miniature river is through a 36 m long pipe with a diameter of 0,8m and the slope in the brook is 1:350m (3 ‰).

The use of riparian vegetation, roots with rootwad and large woody debris contributes with food and shelter for fish and also makes the area look very natural and untouched. The miniature river is constructed in a way that ensures that there will always be a minimum of running water. Discharge and water temperature is monitored in real-time. Along with annual biological inquires this will provide useful surveillance data that can be useful in similar projects.

Monitoring surveys and results

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Water flow and temperature is logged every hour Benthos and fish will be monitored yearly by NIVA. The first salmon fry was observed two days after the channel was opened. One month after there were fish in the whole side channel: A. salmon, brown trout and flounder. There were three cohorts of A. salmon observed: 1+, 2+ & 3+.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Kjøsnesbekken in the river Stjørdalselva WFD water body codes 124.666 WFD (national) typology WFD water body name Pre-project morphology Dry land, Old river bed Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Brown trout (Salmo trutta), Atlantic salmon (Salmo salar) Dominant hydrology Dominant substrate Gravel, Bedrock, Clay River corridor land use Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) Average bankfull channel depth category Less than 0.5 m Average bankfull channel depth (m) Mean discharge category 100 - 1000 m³/s Mean annual discharge (m3/s) Average channel gradient category 0.01 - 0.1 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 700700 m <br />0.7 km <br />70,000 cm <br /> Project started 2012/01/01 Works started Works completed 2013/07/01 Project completed Total cost category more than 10000 k€ Total cost (k€) 100100 k€ <br />100,000 € <br /> 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 NIVA Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Loss of suitable habitat and biodiversity Hydromorphology 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