Case study:Restoration of Naarkoski Torrent

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Location: 60° 38' 30.99" N, 25° 35' 17.96" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	Finland
Main contact forename	Kari
Main contact surname	Rantakokko
Main contact user ID
Contact organisation	SYKE
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Naarkoski Torrent after restoration (photo: )

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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Catchment

River basin district	Porvoonjoki River Basin
River basin

Subcatchment

River name	Naarkoski Torrent
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion	Fenno-Scandian Shield
Dominant land cover	Intensive agriculture (arable)
Waterbody ID

Site

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Name	Naarkoski Torrent-fishway
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Ponded
Reference morphology	Step-pool
Desired post project morphology
Heavily modified water body
National/international site designation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology	Ephemeral
Dominant substrate
River corridor land use	Intensive agriculture (arable)
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

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Reach length directly affected (m)
Project started	2002/01/01
Works started
Works completed	2003/01/01
Project completed
Total cost category	100 - 500 k€
Total cost (k€)	160 k€160,000 € <br />
Benefit to cost ratio
Funding sources	SYKE, European Regional Development Fund (ERDF), Municipality of Pukkila, Regional ELY-centre, Uusimaa Regional Council

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

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Mitigation of a pressure
Hydromorphology
Biology	Fish
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Building fishway, Introducing gravel, Building of submerged weirs and pits, Introducing stones
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
	Before measures	After measures	Qualitative	Quantitative

Physico-chemical quality elements

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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

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

Monitoring documents

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Image gallery

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Restoration of Naarkoski Torrent_bypass construction (photo: )

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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