Case study:Environmental design Mandalsvassdraget

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Location: 58° 14' 40.24" N, 7° 30' 50.40" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Hydropower, Hydromorphology
Country	Norway
Main contact forename	Aleksander
Main contact surname	Andersen
Main contact user ID
Contact organisation	Agder Energi
Contact organisation web site	http://https://www.ae.no/
Partner organisations	Norwegian Institute for Nature Research (NINA), Sintef, Norce Research, Skandinavisk Naturovervåking
Parent multi-site project
This is a parent project encompassing the following projects	No

Removal of weirs in the Mandalselva river in connection to efforts to make earlier unproductive sones accessible as spawning and aufwuchs areas for salmon. Foto: Agder Energi

Project summary

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Mandalselva is regulated for hydropower production since 1947 and this has impacted the conditions for Atlantic salmon in this river. The project "Miljødesign Mandalselva" used the concept of Environmental Design as described in the "Handbook for environmental design in regulated salmon river (Forseth and Harby 2013) and was accompanied by thorough research efforts in order to study which measures would be suitable to improve the conditions for salmon and at the same time to take into account hydropower production. This researcj was led by the Norwegian Institute for Nature Research (NINA) and conducted in cooperation with SINTEF Energy, Norce Research and Skandinavisk Naturovervåking. It included i.a. a trade-off analysis between the production of Atlantic salmon and the production of hydropower by examining the use of several physical mitigation measures and changes in release of water. Local stakeholders and public natural resource management were involved by means of a counceling group. As a result, nine weirs in the river were removed and further habitat improving measures were put in place (e.g. installation of gravel habitat).

Monitoring surveys and results

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Monitoring surveys and results are expected to be published soon.

Lessons learnt

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expected soon...

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes 022-649-R WFD (national) typology WFD water body name Mandalselva Pre-project morphology Varies in character from low to high gradient within short stretches; 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 Atlantic salmon (Salmo salar) Dominant hydrology The flow regime is characterized by frequent fluctuations in dicharge. Dominant substrate Reaches alternating between material of glacio-fluvial and moraine sediments River corridor land use Intensive agriculture (arable) 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) 8888 m³/s <br />88,000 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) Project started 01.10.2014 Works started Works completed Project completed Total cost category 100 - 500 k€ Total cost (k€) 394394 k€ <br />394,000 € <br /> Benefit to cost ratio Funding sources Agder Energi Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Norwegian Institute for Nature Research (NINA) Torbjørn Forseth Stakeholder engagement and communication Agder Energi Alexander Andersen Works and works supervision Agder Energi Alexander Andersen Post-project management and maintenance Agder Energi Alexander Andersen Monitoring Norwegian Institute for Nature Research (NINA) Torbjørn Forseth Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydropower Hydromorphology Quantity & dynamics of flow (minimum flow), Weirs, Substrate conditions Biology Fish Physico-chemical Nutrient concentrations Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Removal of weirs (9 weirs), installation of gravel habitat, establishment of shelter in the substrate, sediment harrowing (using an excavator); introduction of larger stones in the riverbed, stream Floodplain / River corridor Activation of sidearms Planform / Channel pattern Other Non-structural measures Management interventions Future increase of minimum discharge still under evaluation Social measures (incl. engagement) Active involvement of local interests groups and land owners 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 NJFF nr2 2016 web Forseth En suksesshistorie om forksning og tiltak for laks i Mandalselva.pdf Additional links and references Edit links and references Link Description http://https://docplayer.me/33318388-Multi-kriterie-analyse-av-kompenserende-tiltak-for-regulerende-okosystemtjenester-ecomanage.html Presentation of research on multi-criteria analysis of different habitat improving measures for Mandalselva (CEDREN/EcoManage project), David N. Barton et al. 2015 http://https://www.sciencedirect.com/science/article/pii/S136481521831291X Article Barton et al. 2020 Multi-criteria decision analysis in Bayesian networks - Diagnosing ecosystem service trade-offs in a hydropower regulated river. Study conducted at Mandalselva Supplementary Information Edit Supplementary Information