Case study:Sågarsfors

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Location: 60° 12' 59.21" N, 24° 14' 42.69" E

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Project overview

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Status	Complete
Project web site	http://www.ely-keskus.fi/fi/ELYkeskukset/uudenmaanely/Ajankohtaista/Julkaisut/julkaisusarja/2011/Sivut/Kunnostuksenvaikutuksetvuollejokisimpukkaan%28Uniocrassus%29.aspx
Themes	Fisheries, Habitat and biodiversity
Country	Finland
Main contact forename	Esa
Main contact surname	Lehtinen
Main contact user ID
Contact organisation	Centre for Economic Development, Transport and the Environment for Uusimaa
Contact organisation web site	http://www.ely-keskus.fi/fi/ELYkeskukset/uudenmaanely/Sivut/default.aspx
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The old water power mill at Sågarfors in River Siuntionjoki formed a complete obstacle for migrating fish. The dam was removed and a nature-like bypass channel was constructed to improve the conditions for migrating fish.

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	Siuntionjoki River Basin
River basin

Subcatchment

River name	Siuntionjoki River
Area category	100 - 1000 km²
Area (km2)	230 km²23,000 ha <br />
Maximum altitude category
Maximum altitude (m)
Dominant geology	Organic (i.e. Peat)
Ecoregion	Fenno-Scandian Shield
Dominant land cover
Waterbody ID

Site

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Name	Sågarsfors dam
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Ponded
Reference morphology	Artificial channel
Desired post project morphology
Heavily modified water body	No
National/international site designation
Local/regional site designations
Protected species present	Yes
Invasive species present	No
Species of interest	Sea trout (Salmo trutta), freshwater pearl mussel (Margaritifera margaritifera)
Dominant hydrology	Artificially regulated
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category	1 - 10 m³/s
Mean annual discharge (m3/s)	2,8",8" is not declared as a valid unit of measurement for this property.
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	500500 m <br />0.5 km <br />50,000 cm <br />
Project started	2006/01/01
Works started	2007/09/02
Works completed
Project completed	2010/12/31
Total cost category	50 - 100 k€
Total cost (k€)	100100 k€ <br />100,000 € <br />
Benefit to cost ratio
Funding sources	Centre for Economic Development, Transport and the Environment for Uusimaa, SYKE

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design			Centre for Economic Development, Transport and the Environment fo Uusimaa
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
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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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	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Before dam removal (Jukka Jormola)

Before dam removal (Jukka Jormola)

Work (Jukka Jormola)

After dam removal (Jukka Jormola)

After dam removal (Jukka Jormola)

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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