Case study:Habitat improvement measures in Bortneelva

0.00

(0 votes)

To discuss or comment on this case study, please use the discussion page.

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

Edit location

Loading map...

{"format":"googlemaps3","type":"HYBRID","minzoom":false,"maxzoom":false,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":50,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"... further results","default":"","import-annotation":false,"width":"auto","height":"400px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"visitedicon":"","wmsoverlay":false,"zoom":14,"layers":[],"controls":["pan","zoom","type","scale","streetview","rotate"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"resizable":false,"kmlrezoom":false,"poi":true,"cluster":false,"clustergridsize":60,"clustermaxzoom":20,"clusterzoomonclick":true,"clusteraveragecenter":true,"clusterminsize":2,"imageoverlays":[],"kml":[],"gkml":[""],"searchmarkers":"","fullscreen":false,"scrollwheelzoom":false,"showtitle":false,"hidenamespace":true,"template":"Location map popup","userparam":"","activeicon":"","pagelabel":false,"ajaxcoordproperty":"","ajaxquery":"","locations":[{"text":"\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Title:\u003C/b\u003E Habitat improvement measures in Bortneelva\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003ECountry:\u003C/b\u003E \u003Ca href=\"/wiki/index.php?title=Norway\" title=\"Norway\"\u003ENorway\u003C/a\u003E\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EProject Status:\u003C/b\u003E Complete\n\u003C/p\u003E\u003Cp\u003E\u003Cb\u003EThemes:\u003C/b\u003E Monitoring\n\u003C/p\u003E\u003Cp\u003E\u003Cbr /\u003E\n\u003C/p\u003E","title":"Habitat improvement measures in Bortneelva","link":"","lat":61.847066036965,"lon":5.3938993951002,"icon":"/wiki/images/a/af/Red_marker.png"}]}

Left click to look around in the map, and use the wheel of your mouse to zoom in and out.

Project overview

Edit project overview

Status	Complete
Project web site	http://www.vannportalen.no/vannregioner/sogn--og-fjordane/vassomrade/nordfjord/nyhende-nordfjord/2017/miljotiltak-i-bortneelva/
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydropower, Hydromorphology, Monitoring
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 (Vannområde) Nordfjord /Bremanger municipality, Uni Research Miljø LFI, Rådgivende Biologer AS
Parent multi-site project
This is a parent project encompassing the following projects	No

Project picture

Project summary

Edit project overview to modify the project summary.

Svelgen Kraft (SK) use about 7% of the water that flows naturally in the Bortne-river for power production at the Svelgen I power plant. The measures carried out in the river were planned to mitigate the impacts of the power production and to enhance the growing and living conditions of anadromous fish in the river.

Mapping and improvement works were prioritized. This was driven by many factors and stakeholders, including landowners, the County Governor's environmental protection department, the EU's water framework directive and SK themselves. The renewal of the concessions for the Svelgen I and II power plants were in review and SK's goal is to practice environmentally sound water management. The survey was carried out by Uni Research Miljø LFI in 2016. Habitat conditions in the river were described and possible measures were suggested to improve the fish's growing and living conditions.

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

Monitoring surveys and results

Edit project overview to modify the Monitoring survey and results.

https://www.radgivende-biologer.no/wp-content/uploads/2019/10/2910.pdf

https://docplayer.me/50826638-Habitatkartlegging-i-bortneelva-bremanger-kommune.html

Lessons learnt

Edit project overview to modify the lessons learnt.

Results so far:

Fish studies were conducted in 2018 by Rådgivende Biologer AS. Due to general low densities of juvenile fish in 2018, there were not enough data to say anything conclusive about the effects of the measures conducted in the river (Irgens, C. & Hellen, B.A. 2019. Fiskebiologiske undersøkelser i Bortneelva i 2018. Rådgivende Biologer AS, rapport 2910, 16 sider, ISBN 978-82-8308-63 3-1).

Image gallery

Edit Image gallery

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Bortneelva WFD water body codes 086-141-R and 086-139-R WFD (national) typology RWH1211 WFD water body name Bortneelva og Bortneelva, nedre del Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest Salmon and Sea-trout Dominant hydrology Artificially regulated Dominant substrate Cobble River corridor land use Grassland, Woodland 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) 2.12.1 m³/s <br />2,100 l/s <br /> Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 20002,000 m <br />2 km <br />200,000 cm <br /> Project started 2014/01/01 Works started Works completed Project completed 2017/01/01 Total cost category Total cost (k€) Benefit to cost ratio Funding sources Svelgen Kraft AS, The Norwegian Public Roads Administration and Sub-district Nordfjord /Bremanger municipality 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 Hydropower, Barriers to fish migration Hydromorphology Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Deflectors, Creation of fish passes, Removal of fish barriers, Creation of pools, Creation of fish refuge areas, introduction of blocks, Big rocks are placed in the stream, Creation of low flow channel Floodplain / River corridor Improving fish migration 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 Fish Yes Yes No No No Inconclusive 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 http://docplayer.me/50826638-Habitatkartlegging-i-bortneelva-bremanger-kommune.html Plan of measures http://www.radgivende-biologer.no/wp-content/uploads/2019/10/2910.pdf Report http://www.vannportalen.no/vannregioner/sogn--og-fjordane/vassomrade/nordfjord/nyhende-nordfjord/2017/miljotiltak-i-bortneelva/ Website Vannportalen http://lakseelver.no/nb/news-2018/overvakning-i-bortneelva-og-eidselva Website on research in river Eidselva http://www.firdaposten.no/bremanger/svelgen/fiskeoppdrett/inviterer-villfisken-tilbake-til-elva/f/5-16-148302 News article Supplementary Information Edit Supplementary Information