Case study:Restoration of the river Børselva

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Location: 68° 18' 13.95" N, 16° 42' 48.11" E

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Project overview

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Status	In progress
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Land use management - agriculture
Country	Norway
Main contact forename	Lars
Main contact surname	Sæter
Main contact user ID
Contact organisation	County Governor of Nordland
Contact organisation web site	http://www.fylkesmannen.no/nordland
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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Condition in 1999 - before measures: Siltation and overgrowth of macrophytes due to greatly reduced water flow (hydropower regulation) and drainage from agriculture. Very poor conditions for fish and other aquatic organisms. Nearly 70% of the water area in Børselva was covered by plants. Important wetland biotopes for wetland birds were about to disappear. Large parts of the trout’s spawning and growing areas were destroyed.

Measures implemented: Measures in the agricultural channel ("Bruksåskanalen"): Erosion control, establishment of sedimentation ponds with vegetation filters and revegetation along the channel. Establishment of three paved thresholds in Børselva, laying of spawning gravel. 1 km of the overgrown part of the river was opened with an excavator and by laying of fiber fabric with stone and gravel on top. Dredging and opening of the rest of the

Børselva with a large excavator ("Langemann"). Testing of different water discharges in Børselva (from the dam in Børsvatnet) - main focus on “flushing floods” and winter water flow. Condition in 2019 – after measures: Studies show major environmental improvements, but the environmental objectives of good chemical status and good ecological potential have not yet been achieved. Further measures are required to reduce agricultural runoff and to implement the final regime for environmentally based water discharges. As of 2019, the hydroelectric license is under review at NVE (The Norwegian Water Resources and Energy Directorate).

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Lessons learnt

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The measures in the Børselva watercourse (Børselvvassdraget) have created better water quality and hydrological continuity (open water flow) in the formerly overgrown watercourse. The flow levels have improved, self-cleaning has improved and pollution has been reduced. This has resulted in a more varied benthic fauna, better spawning and growing conditions for the trout and improved conditions for the bird fauna.

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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