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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Project summary

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Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Site

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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

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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 angling club

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

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Mitigation of a pressure	Flow channelization
Hydromorphology
Biology
Physico-chemical
Other reasons for the project	Improving aestethics of the river and riverbank.

Measures

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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

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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Physico-chemical quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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Any other monitoring, e.g. social, economic

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Element	When monitored		Type of monitoring		Control site used	Result
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Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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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.