Case study:Hofstadelva

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Location: 63° 29' 51.23" N, 11° 6' 40.33" E

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Flood risk management
Country	Norway
Main contact forename	Mads
Main contact surname	Johnsen
Main contact user ID
Contact organisation	The Norwegian Water Resources and Energy Directorate (NVE)
Contact organisation web site	http://www.nve.no
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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Hofstadelva is a small side-river in a larger river system of Stjørdalselva. Due to risk of avalanche and erosion large sections of embarkments are established along both sides of Hofstadelva. Mitigation efforts included shaping of the embarkments to mimic the original stream structure, topsoil and turf transplants are used to improve natural vegetation recovery along the river.

Monitoring surveys and results

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A monitoring program for fish, benthos, plant life and birds during 2016 - 2018. Natural recovery is observed for all species groups. Grazing domestic animals cause some erosion that limit establishment of forest, and soil erosion into the river might be limiting for benthos.

Lessons learnt

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Pre-project studies and cooperation have been important for the output. The involvemnt of experts in early phases of the projects have improved the positiv effects of mitigation. Mapping of species and ecosystem variables before the contruction is valuabel reference state for the monitoring after implementation.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Hofstadelva WFD water body codes WFD (national) typology 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 Yes Invasive species present Yes Species of interest some invasive species observed Dominant hydrology Dominant substrate River corridor land use Grazing, settlement 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) 19001,900 m <br />1.9 km <br />190,000 cm <br /> Project started 2011 Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources NVE Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design NVE Stakeholder engagement and communication NVE Works and works supervision NVE Post-project management and maintenance NVE Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Mitigating river environment following embankments for erosion control 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 Invertebrates: Abundance Yes Yes No Yes No Improvement Fish: Abundance Yes Yes No Yes No Improvement Fish: Age structure Yes Yes No Yes No Improvement 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 Birds Yes Yes No Yes No Inconclusive river bank vegetation Yes Yes No Yes No Improvement Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://https://brage.nina.no/nina-xmlui/bitstream/handle/11250/2433005/1320.pdf?sequence=4&isAllowed=y Monitoring report Hofstadelva 2016 http://https://www.ntnu.no/c/document library/get file?uuid=0ede4612-85c7-4b0e-85f7-08d7ecbd5a39&groupId=10476 Report before embarkment Hofstadelva 2011 Supplementary Information Edit Supplementary Information