Case study:River Fugla

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Location: 63° 26' 37.73" N, 10° 54' 55.86" E

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Project overview

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

Rocks, gravel and roots were placed to the brook (photo Arne Jørgen Kjøsnes)

Project summary

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The river Fugla is a small river in Hell in Stjoerdal community in the middle part of Norway. River is situated next to the river Stjørdalselva. This is in an area susceptible to slides and the river has been cutting increasingly deeper into the potential unstable sediments.

Quick clay is a type of marine clay prone to sudden loss of strength when disturbed. After failure the clay may become liquid, and this could lead to big landslides. Primarily found in the upper region of the Northern Hemisphere. Quick clay slides occur without warning and may wipe out large areas often causing loss of life and substantial material damage. Landslides can be triggered by high rivers that erode and saturate clay slopes, by melt water and rain that destabilize a deposit or by human activity such as fillings, excavations etc.. In populated areas with high risk of landslide hazard, improvements as raising the river bottom is used to stop erosion. In many rivers and brooks large stretches of the river bed might be raised by several meters and both the river bed and banks will be plastered with erosion-proof rocks.

NVE secured this river for further erosion and the work was conducted with the use of erosion-proof rocks both in the river bed and banks for a total distance of about 600 meters. Prior to the mitigating work the water quality was poor and the river was often colored grey due to erosion. Also logs, roots etc were placed in the brook and spawning gravel in to the rapid areas.

The construction work protects the area from the slides. At the same time it can ruin habitats for anadromous fish and aquatic invertebrates. To restore the river and recreate suitable habitats for sea trout and salmon, some simple mitigating measures were done. Building small weirs to create deeper ponds, adding spawning gravel, roots with rootwad, and the use of logs and large woody debris, made the river more suitable for aquatic organisms. Mitigating measures were set up over a distance of about 250 meters of the river. With the measures done the river now lookes more natural.

Monitoring surveys and results

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The brook is now more suited for fish because the water quality is better. One month after the restoration work numerous sea trout individuals were observed spawning in the River Fugla.

Lessons learnt

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes 124-44-R WFD (national) typology WFD water body name Pre-project morphology Artificial channel, coloured water due to erosion Reference morphology Straightened 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 Clay 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) Project started 2013/05/05 Works started Works completed Project completed 2013/10/31 Total cost category Total cost (k€) 160160 k€ <br />160,000 € <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 Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Loss of suitable habitat and biodiversity due to human impacts ( stability improvements) Hydromorphology Biology Fish, Invertebrates Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank improvement, Introduction of gravel, Adding sinuosity, Bank stabilisation 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 Invertebrates No Yes No No No 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