Case study:Restoration of Juottimenoja Brook

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Location: 60° 11' 22.62" N, 23° 5' 57.75" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management
Country	Finland
Main contact forename	Jukka
Main contact surname	Jormola
Main contact user ID
Contact organisation	Finnish Environment Institute
Contact organisation web site
Partner organisations	Centre for Economic Development, Transport and the Environment for Southwest Finland
Parent multi-site project
This is a parent project encompassing the following projects	No

Juottimenoja after restoration (photo: Liisa Laitinen).jpg

Project summary

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Juottimenoja brook is a small tributary of the Kiskonjoki-Perniönjoki River located in south-west Finland. The surrounding of Juottimenoja is intensively cultivated and the latest dredging was in 1970. The brook suffered severe erosion and siltation problems due to erosion-prone soil, intensive farming, and previous straightening. Juottimenoja brook was restored because fields were inundating during high flows. The objective of the restoration was to decrease water levels, and thus field flooding, and control the in-channel erosion during high flows and siltation during low flows as the aim to maintain the brook morphological and ecological diversity and self-purification capacity while meeting the drainage needs of the farmland. In the latest drainage project in 2007 flood terrace were excavated and nature-like submerged weirs were constructed to stop erosion. Besides drainage the environmentally sound measures could help to maintain the original sea trout population in the brook.

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Catchment and subcatchment

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Catchment

River basin district	Kiskonjoki-Perniönjoki River Basin
River basin

Subcatchment

River name	Juottimenoja Brook
Area category
Area (km2)
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	Juottimenoja Brook Catchment
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	eroded channel
Reference morphology
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, Quick run-off
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	2007/01/01
Works started
Works completed	2007/01/01
Project completed
Total cost category	50 - 100 k€
Total cost (k€)	63 k€63,000 € <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	Flood risk management
Hydromorphology	Quantity & dynamics of flow, Continuity of sediment transport, Width & depth variation, Structure & condition of intertidal zone
Biology
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor
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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

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Physico-chemical quality elements

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Monitoring documents

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Image gallery

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Juottimenoja before restoration (2-stage drainage channel) (photo: Auri Sarvilinna).jpg

Juottimenoja restoration (photo: Liisa Laitinen).jpg

Juottimenoja after restoration (photo: Liisa Laitinen).jpg

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Additional links and references

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Supplementary Information

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