Case study:Reopening and restoration of the stream Hovinbekken

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Location: 59° 55' 13.33" N, 10° 47' 33.09" E

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Project overview

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Status	In progress
Project web site
Themes	Economic aspects, Flood risk management, Habitat and biodiversity, 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	Sub-district (Vannområde) Oslo, Norwegian Institute for Water Research (NIVA), Norwegian Institute for Water Research (NIVA), The Norwegian Environmental Agency (Miljødirektoratet), The Norwegian Water Resources and Energy Directorate (NVE), County Governor of Oslo og Viken
This is a parent project encompassing the following projects	Teglverksdammen

Hovinbekken at Bjerkedalen Park 2017. Photo: Therese Fosholt Moe / Norwegian Institute for Water Research (NIVA)

Project summary

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Hovinbekken is one of several streams that were covered and culverted during the urban development of Oslo and the surrounding area in the 19th century. It is now considered a Heavily Modified Water Body (HMWB). Through Oslo municipality's program, “Byøkologisk program 2011-2026”, plans were made to reopen closed streams and create blue-green corridors throughout the city. This included also the reopening of the stream Hovinbekken and restoration of parts of it back to a more natural state. Here is a list of the restoration projects in Hovinbekken (completed, in progress or planned). These stretches of river are going to be reopened and/or undergo different types of restoration work:

• Side stream Barkebåtbekken - Finished in 2007

• The award winning Bjerkedalen park - Finished in 2013

• Tegelverkstomta/Tegelverksdammen - Finished in 2015

• Ensjøbyen - In progress

• Jordal - In progress

• Klosterenga park - Planned

Monitoring surveys and results

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https://www.vann-nett.no/portal/#/waterbody/006-70-R

Lessons learnt

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Hovinbekken WFD water body codes 006-70-R WFD (national) typology REL1411 WFD water body name Hovinbekken nedstrøms Økern 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 No Invasive species present No Species of interest Dominant hydrology Dominant substrate 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 0.1 - 1.0 m³/s Mean annual discharge (m3/s) 0.180.18 m³/s <br />180 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, Flood risk management Hydromorphology Continuity for organisms Biology Fish, Invertebrates Physico-chemical Nutrient concentrations, Specific non-synthetic pollutants Other reasons for the project Landscape enhancement, Recreation, Community demand Measures Edit Measures Structural measures Bank/bed modifications Reopening of culverted river, Habitat restoration, habitat creation, Creation of pools and riffles, Sediment trap building Floodplain / River corridor Planform / Channel pattern Creation of pools and riffles, Creation of pond 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 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://www.osloelveforum.org/wp-content/uploads/2017/10/Prinsipper-for-gjen%C3%A5pning-av-bekker-og-elver-i-Oslo-2015.pdf http://www.vannportalen.no/globalassets/nasjonalt/dokumenter/arrangementer/gjennomforte-arrangementer/restaureringsseminar/2010/7---donnum---sweco-urbane-strok.pdf http://levendevassdrag.no/wp-content/uploads/2015/01/Hovinbekken-faktaark.pdf http://www.vannportalen.no/globalassets/nasjonalt/dokumenter/arrangementer/gjennomforte-arrangementer/restaureringsseminar/2013/10---jensen.pdf Supplementary Information Edit Supplementary Information