Case study:Restoration of Kocksbybäcken brook

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Location: 60° 4' 43.22" N, 24° 13' 31.82" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	Finland
Main contact forename	Jukka
Main contact surname	Jormola
Main contact user ID
Contact organisation	SYKE
Contact organisation web site	http://www.environment.fi
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

File:Kocksby after restauration (Liisa Hämäläinen).jpg

Kocksby brook after restauration (photo:Liisa Hämäläinen)

Project summary

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The Kocksbybäcken brook is a tributary of the Ingarskilanjoki River in Degerby village in the municipality of Inkoo. The catchment area of the brook is 11 km2. Kocksbybäcken brook was restored in the as the aim of enhancing the habitat diversity of the brook for migratory trout. The object was to support the natural development of the brook by adding sinousity and width and depth variation. Also stones and gravel were added and replaced to create habitats for the brown trout. The restored part was 330m Brook serves as a drainage channel for the surrounding agricultural fields

In the case of Kocksbybäcken broo, only few trouts were found in the research section in 2005 before restoration. However, the number of juvenile trouts in the reference section downstream was exceptionally high, with 300 juveniles per 100 m². After restoration in 2006, only few trouts were found in the reference section and none in the restored section. One reason was that the year was too dry for juvenile trout production. In 2007 trout number increased in the restored section

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	Ingarsilanjoki River Basin
River basin

Subcatchment

River name	Kocksbybäcken Brook
Area category	10 - 100 km²
Area (km2)	11 km²1,100 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology	Organic (i.e. Peat)
Ecoregion	Fenno-Scandian Shield
Dominant land cover	Intensive agriculture (arable)
Waterbody ID

Site

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Name	Catchment of Kocksbybäcken Brook
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology	over-widened, overdeepened, Sinuous
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
Works started
Works completed
Project completed
Total cost category	1 - 10 k€
Total cost (k€)	4 k€4,000 € <br />
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

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Mitigation of a pressure
Hydromorphology	Width & depth variation, Continuity for organisms
Biology	Fish: Disturbance-sensitive species, Fish: Abundance
Physico-chemical	Nutrient concentrations
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Adding sinuosity, Re-introducing stones, Introducing gravel
Floodplain / River corridor
Planform / Channel pattern
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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
Fish: Abundance						Improvement

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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Kocsby brook before restauration (photo: Liisa Laitinen)

Kocksby restaurations (photo: Liisa Laitinen)

Additional documents and videos

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Additional links and references

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Link	Description
http://www.ecosystemsclimate.org/WatchRead	Drainage and fishery needs in the restoration of agricultural brooks.

Supplementary Information

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