Case study:Restoration of the river Akerselva

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Location: 59° 54' 49.76" N, 10° 45' 30.27" E

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Project overview

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Status	In progress
Project web site
Themes	Economic aspects, Environmental flows and water resources, Flood risk management, Habitat and biodiversity, Hydropower, Hydromorphology, Monitoring, Social benefits, Spatial planning, Water quality, Urban
Country	Norway
Main contact forename	Agency of Urban Environment (temporary)
Main contact surname	Oslo municipality (temporary)
Main contact user ID
Contact organisation	Oslo municipality
Contact organisation web site	http://www.oslo.kommune.no
Partner organisations	Akerselvas Venner (MAV), Sub-district (Vannområde) Oslo, Norwegian Institute for Water Research (NIVA), Norwegian Institute for Water Research (NIVA), The Norwegian Environmental Agency (Miljødirektoratet), Oslo Elveforum, The Norwegian Water Resources and Energy Directorate (NVE), County Governor of Oslo og Viken
This is a parent project encompassing the following projects

River Akerselva at the Kuba Park (Kubaparken) in 2016. Photo: Oslo Municipality, Agency for Urban Environment.

Project summary

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The river Akerselva is one of the main rivers that flows through the city of Oslo and starts at the lake Maridalsvannet to the north of the city. Like many other urban rivers, Akerselva has been impacted by urban development and activities since the 19th century. Much has been done during the last 25 years to improve water quality and reduce pollution. Through Oslo municipality's program, “Byøkologisk program 2011-2026”, work was carried out to reopen culverted streams and to create blue/green corridors throughout the city. This was one of the drivers for restoration work in Akerselva and other rivers in Oslo. Several restoration projects have already been carried out in Akerselva in recent years and more are planned in the future.

Here is a list of some of the restoration measures that have been completed in different sections of the river:

• 2000: Reopening of river stretches in relation to Akerselva miljøpark in Nydalen

• 2013: Habitat improvement measures in Akerselva between Kuba and Ankerbua

• 2016: Habitat improvement measures by Kubaparken

• 2017: Habitat improvement measures in the Karsten Warholm neighbourhood by Badebekken

• 2018: Habitat improvement measures at 3 localities in the middle part (by Myreløkka, Ivan Bjøndals gate and Lillogata)

• 2019: Building/improving fish stairs at Grønvoldsterskelen

Monitoring surveys and results

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https://www.vann-nett.no/portal/#/waterbody/006-74-R

Lessons learnt

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Akerselva WFD water body codes 006-74-R WFD (national) typology REL2311 WFD water body name Akerselva nedstrøms Nydalsdammen Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest Salmon (Salmo salar) and Sea-trout (Salmo trutta trutta) Dominant hydrology Dominant substrate Cobble River corridor land use Urban Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category 1 - 10 m³/s Mean annual discharge (m3/s) 6.436.43 m³/s <br />6,430 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 2011/01/01 Works started Works completed Project completed 2026/01/01 Total cost category Total cost (k€) Benefit to cost ratio Funding sources Oslo municipality, The Norwegian Environmental Agency (Miljødirektoratet) 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 Urbanisation, Pollution incident Hydromorphology Biology Invertebrates Physico-chemical Specific non-synthetic pollutants Other reasons for the project Community demand, Landscape enhancement, Recreation Measures Edit Measures Structural measures Bank/bed modifications Habitat restoration, Re-introducing spawning gravel, Reopening of side channels Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Reduced pollution 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 Invertebrates Yes 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 http://vannforeningen.no/wp-content/uploads/2019/09/4-Akerselvas-forringelse-og-restaurering-Langaas-et-al.pdf http://www.osloelveforum.org/wp-content/uploads/2017/10/Prinsipper-for-gjen%C3%A5pning-av-bekker-og-elver-i-Oslo-2015.pdf Supplementary Information Edit Supplementary Information