Case study:Restoration of Longinoja brook

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Location: 60° 14' 54.16" N, 25° 1' 36.90" E

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Project overview

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Status	Complete
Project web site
Themes
Country	Finland
Main contact forename	Virho
Main contact surname	Webb
Main contact user ID
Contact organisation	Finnish Environment Institute
Contact organisation web site
Partner organisations
This is a parent project encompassing the following projects

Longinoja after restauration_may 2006 (photo: Liisa Laitinen)

Project summary

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Longinoja brook has been restored several times during last years. The straightened brook flows through both a densely populated area and along farmland and is an important breeding area for sea trout in the Vantaanjoki River in Helsinki city. The aims of restorations have been to increase the breeding possibilities for migrating fish and also to improve the area’s landscape. Restoration was part of the project where modern environmental hydraulic engineering methods were studied in the areas with fine-grained soils. The planning aimed to enhance natural conditions and at the same time maintain sufficient drainage level. The restoration project was good example of succeeded co-operation between different organizations and stakeholders. The project was managed by the Finnish Environmental authorities (Finnish Environment Institute and Centre for Economic Development, Transport and the Environment) and the city of Helsinki and mostly accomplished by volunteers in co-operation with the authorities.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

Catchment

River basin district	Southern Finland
River basin	Vantaanjoki River

Subcatchment

River name	Longinoja brook
Area category	10 - 100 km²
Area (km2)	12 km²1,200 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion	Fenno-Scandian Shield
Dominant land cover	Urban
Waterbody ID

Site

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Name	Cathment of Longinoja brook
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Straight
Reference morphology	Sinuous
Desired post project morphology
Heavily modified water body	true
National/international site designation
Local/regional site designations	multiple designations across the site
Protected species present
Invasive species present
Species of interest
Dominant hydrology	Ephemeral
Dominant substrate
River corridor land use	Urban
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	2006/01/01
Works started
Works completed	2011/01/01
Project completed
Total cost category	10 - 50 k€
Total cost (k€)	10000 k€10,000,000 € <br />
Benefit to cost ratio
Funding sources	Finnish Environment Institute

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			Finnish Environment Institute

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology	Continuity for organisms, Continuity of sediment transport
Biology	Fish: Species composition, Fish: Abundance, Fish: Disturbance-sensitive species, Invertebrates: Abundance
Physico-chemical
Other reasons for the project	Landscape enhancement

Measures

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Structural measures
Bank/bed modifications	Building fishways, Building of submerged weirs and pits, Adding sinuosity, Introducing gravel
Floodplain / River corridor
Planform / Channel pattern	Introducing sinuosity, Introducting large woody debris
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other	Information provision, Participation in works, Participation in monitoring

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
Continuity for organisms						Awaiting results
Continuity of sediment transport						Awaiting results

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						Awaiting results
Fish: Disturbance-sensitive species						Awaiting results
Fish: Age structure						Awaiting results
Invertebrates: Abundance						Awaiting results

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
Landscape enchansement		Yes				Awaiting results

Monitoring documents

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Image gallery

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Longinoja after restauration may 2006 (photo: Liisa Laitinen).jpg

Longinoja restauration march 2006 (photo:Jukka Jormola).jpg

Longinoja brook after restoration (photo: Lasse Jarvenpaa; www.itamerihaaste.net

Stream restoration by voluntary work_Longinoja Brook_May 2012 (photo: Auri Sarvilinna; www.environment.fi/default.asp)

After restauration (photo:Liisa Laitinen, SYKE; www.itamerihaaste.net)

Before restauration (photo:Harri Aulaskari; www.itamerihaaste.net)

Spowning trout on a restored Longinoja gravel bad (photo:www.ecrr.org.)

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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