Case study:Habitat improvement measures in Bortneelva

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Location: 61° 50' 49.44" N, 5° 23' 38.04" E

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Project overview

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Status	Complete
Project web site	http://www.vannportalen.no/vannregioner/sogn--og-fjordane/vassomrade/nordfjord/nyhende-nordfjord/2017/miljotiltak-i-bortneelva/
Themes	Habitat and biodiversity, Hydropower, Hydromorphology
Country	Norway
Main contact forename	Vegard
Main contact surname	Fagerli
Main contact user ID
Contact organisation	SFE Produksjon AS
Contact organisation web site	http://sfe.no/konsern
Partner organisations	Svelgen Kraft AS, The Norwegian Public Roads Administration, County Governor of Vestland, Sub-district Nordfjord /Bremanger municipality, Uni Research Miljø LFI, Rådgivende Biologer AS
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Svelgen Kraft (SK) utilize about 7% of the water that flows naturally in the Bortne-river for power production at the Svelgen I power plant. The established measures in the river will mitigate the impacts from this production and hopes to enhance the growing and living conditions for anadromous fish in the river.

At the request of landowners and a dialogue with the County Governor's environmental protection department, SK took the initiative to map the river. In the light of ongoing processes such as the EU's water framework directive and renewal of the concessions for the Svelgen I and II power plants, as well as SK's goal of operating environmentally sound water management, mapping and measures were prioritized. The survey was carried out by Uni Research Miljø LFI in 2016. Habitat conditions in the river was depicted and possible measures were suggested to improve the fish's growing and living conditions.

After clarification with landowners, other operators in the river and authorities, the physical work was carried out in autumn/winter 2016-17 by Machine3prenør1. Different types of measures have been established in an approximated 2 km long stretch of the river.

The following measures were done:

• Removal of migration barriers by building a “fish passage” with two ponds.

• Construction of flow deflectors to concentrate the stream of water in the river, which gives the fish easier migration paths in the case of low water levels.

• Laying of stone blocks and boulders in clusters to improve the fish's ability to hide.

• Digging of ditches and opening of a natural "fish tunnels" to drain water to migration paths at low water levels.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest 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) Project started Works started Works completed Project completed 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 Hydromorphology Biology 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