Case study:Deculverting Holtan stream

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Location: 59° 3' 9.60" N, 10° 13' 30.70" E

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Project overview

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Status	Planned
Project web site
Themes	Habitat and biodiversity, Urban
Country	Norway
Main contact forename	Miguel A.
Main contact surname	Segarra Valls
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Culverted Holtan stream 13th May 2020. Picture: Miguel A. Segarra Valls

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Holtanbekken WFD water body codes NO015-439-R WFD (national) typology R108 WFD water body name Sandefjordsfjorden bekkefelt sør/vest 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 Yes Invasive species present No Species of interest Sea trout (Salmo trutta), European eel (Anguilla anguilla) Dominant hydrology Dominant substrate River corridor land use 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) 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 Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 Hydromorphology Biology Physico-chemical Other reasons for the project 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 Description of the culverted stream, and initial technical proposal for deculverting El-fiske rapport SFFAL 18.10.2020.pdf Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information