Case study:Restoration of Grobruelva

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Location: 59° 49' 7.46" N, 10° 20' 15.93" E

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Project overview

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Status	In progress
Project web site
Themes	Fisheries, Habitat and biodiversity, Land use management - agriculture, Water quality, Urban
Country	Norway
Main contact forename	Ingvild
Main contact surname	Tandberg
Main contact user ID
Contact organisation	Vannområde Indre Oslofjord Vest
Contact organisation web site	http://http://https://www.vannportalen.no/vannregioner/glomma/vannomrader-glomma/indre-oslofjord-vest/
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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This project aimes to improve the habitat conditions of fast-growing sea trout (salmo trutta) in the Grobruelva river in the Lier municipality (Viken). They are impaired by re-routing of side arms, regulation of the main channel and pollution (roads and agriculture). First measures to counter pollution have been implemented (new pipe for sewage runoff). Habitat improving measures are planned, but have not been conducted yet. More information is expected soon and will be updated.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Grobruelva WFD water body codes 009-170-R WFD (national) typology WFD water body name Åro watercourse 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 No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Intensive agriculture (arable), Urban, Coniferous woodland (semi natural) Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) Average bankfull channel depth category Less than 0.5 m Average bankfull channel depth (m) Mean discharge category 1 - 10 m³/s Mean annual discharge (m3/s) Average channel gradient category 0.001 - 0.01 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started 2017/08/01 Works started Works completed Project completed Total cost category 100 - 500 k€ Total cost (k€) 350350 k€ <br />350,000 € <br /> Benefit to cost ratio Funding sources Land owners, municipality and Norwegian Environmental Agency Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Vannområdet Indre Oslofjord Vest Ingvild Tandberg Stakeholder engagement and communication Vannområdet Indre Oslofjord Vest Ingvild Tandberg Works and works supervision 100 - 500 k€ Vannområdet Indre Oslofjord Vest; For some measures: Lierskogen Vel, Lier municipality and Buskerud JFF Ingvild Tandberg Post-project management and maintenance Vannområdet Indre Oslofjord Vest Ingvild Tandberg Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Urbanisation, Pollution (eutrophication), River regulation Hydromorphology Relocation of sidearms, Regulation of main channel Biology Physico-chemical Pollution ( e.g. phosphorus, litter ) Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Installation of gravel habitat (gravel and stones) Floodplain / River corridor Removal of retainment structure (Rotubekken), improvement of fish migration (at Sagvollfossen) Planform / Channel pattern Other New pipe for sewage runoff along a side beck of Grobruelva Non-structural measures Management interventions Removal of litter (especially car tires) 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