Case study:Hurdalselva - River Hurdalselv

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Location: 60° 25' 9.39" N, 11° 3' 37.75" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	Norway
Main contact forename	Bjørn Otto
Main contact surname	Dønnum
Main contact user ID	User:Arolam
Contact organisation
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Site Edit site Name Hurdalselva WFD water body codes WFD (national) typology REM1221 WFD water body name 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 brown trout (Salmo trutta) Dominant hydrology Dominant substrate Cobble, Gravel, bedrock River corridor land use Mainly forest on the west side of the river and in the upper part of the watershed. Some agriculture (rye, barley) along part of the north-east bank of the project site. Forest is dominantly conifers, but deciduous trees and bushes constitutes apprx. 50% of riparian vegetation Average bankfull channel width category 10 - 50 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category 1 - 10 m³/s Mean annual discharge (m3/s) Average channel gradient category more than 0.1 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 11001,100 m <br />1.1 km <br />110,000 cm <br /> Project started Works started Works completed Project completed Total cost category Total cost (k€) 3232 k€ <br />32,000 € <br /> Benefit to cost ratio Funding sources Norwegian Water Resources and Energy Directorate (NVE), private funding, Local fishing associations Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 55 k€ <br />5,000 € <br /> NJFF-Akershus Bjørn Otto Dønnum Stakeholder engagement and communication 11 k€ <br />1,000 € <br /> Hurdal JFF Works and works supervision 2626 k€ <br />26,000 € <br /> NVE Post-project management and maintenance Monitoring Supplementary funding information This was..... Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flow channelization Hydromorphology Biology Physico-chemical Other reasons for the project Improving aestethics of the river and riverbank. Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor 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 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 The works in this particular river stretch was initiated to test different restoration techniques in a rather high gradient river (part of the river section has a gradient of 1,5%). Two days after completion of the in-river works, a large flood (estimated to be a 1:50-year return flood) destroyed part of the constructions. Not very encouraging for the local angling club, because the project was meant to be part of a larger project. Funding however stopped after the trial, and there has not been any attempt to restart the project.