Case study:Restoration of Myllypuro brook

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Location: 60° 19' 55.88" N, 24° 30' 7.34" E
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Project overview

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Status Complete
Project web site
Themes
Country Finland
Main contact forename Lasse
Main contact surname Järvenpää
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Myllypuro brook sinuosity after restauration (photo: Liisa Laitinen)

Project summary

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The Myllypuro brook is located in the Nuuksio Natural Park in Southern Finland. This brook is a pilot case for environmental restoration in Finland. The straightened brook has been restored in 1995-2003. The aim of the project was to restore the channel simulating as far as possible the natural conditions of the channel. The restoration included returning of the historical and devious stream line and also building a flood terrace by the brook. Attention was especially paid to the shape of the channel and the restoration of the flooding. As a pattern for restoration, another reach of the same brook was used. This reach had remained in its natural state. A planning concept based on validated information about the original natural conditions provided a good basis for restoration planning. It was also considered important that the factors limiting the restoration were clearly distinguished.

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
River basin

Subcatchment

River name Myllypuro brook
Area category 10 - 100 km²
Area (km2) 25 km²2,500 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology Organic (i.e. Peat)
Ecoregion Fenno-Scandian Shield
Dominant land cover Woodland
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Site

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Name Cathment of Brook Myllypuro
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology Sinuous
Reference morphology Braided, Sinuous, Pool-riffle
Desired post project morphology
Heavily modified water body
National/international site designation EU - Special Area of Conservation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate Bedrock, Clay
River corridor land use Woodland
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category 2 - 5 m
Average bankfull channel depth (m) 2.2 m0.0022 km <br />220 cm <br />
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient 0.17
Average unit stream power (W/m2)


Project background

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Reach length directly affected (m) 3600 m3.6 km <br />360,000 cm <br />
Project started 2002/01/01
Works started
Works completed 2003/01/01
Project completed
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Reasons for river restoration

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Mitigation of a pressure
Hydromorphology Quantity & dynamics of flow, Width & depth variation, Flow velocities, Continuity of sediment transport
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Measures

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Structural measures
Bank/bed modifications Adding sinuosity
Floodplain / River corridor
Planform / Channel pattern Re-instatement of old course
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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
Quantity & dynamics of flow Yes Awaiting results
Width & depth variation Yes Awaiting results
Channel pattern/planform Yes Awaiting results
Continuity of sediment transport Yes Awaiting results

Biological quality elements

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quality elements
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Physico-chemical quality elements

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quality elements
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Any other monitoring, e.g. social, economic

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Monitoring documents

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Image gallery


Myllypuro brook sinousity after restauration(photo.Liisa Laitinen).jpg
Restauration adding sinousity imitation of natural channel.jpg


Additional documents and videos

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Additional links and references

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Supplementary Information

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