Case study:Silverån övre

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Location: 57° 32' 48.46" N, 15° 44' 32.88" E

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Project overview

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Status	Complete
Project web site	http://www.lansstyrelsen.se/ostergotland/Sv/djur-och-natur/skyddad-natur/naturreservat/ydre/silveran/Pages/index.aspx
Themes	Fisheries
Country	Sweden
Main contact forename	Peter
Main contact surname	Johansson
Main contact user ID
Contact organisation	WWF
Contact organisation web site
Partner organisations
This is a parent project encompassing the following projects

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Project summary

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Silverån flows through northern parts of Småland and southern parts of Östergötland. The river os 75 km long and the catchment area (702 km2) has only few lakes, so the water level can change quite rapidly in the river. Silveråns nature reserve area is located near Jönköping where the river meanders in the shadows of variable forest areas and steep ravins. The water quality is high and the river has a unique and rich water fauna because of the high currents and multiple biotopes. Trout and pearlmussel populations have many breeding areas due to the stream bed that consists of sand, gravel and rocks. Also the strandzone provides vital substance for the stream ecosystem.

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district
River basin	Emåns River Basin

Subcatchment

River name	Silverån River
Area category	100 - 1000 km²
Area (km2)	122 km²12,200 ha <br />
Maximum altitude category	200 - 500 m
Maximum altitude (m)	232 m0.232 km <br />23,200 cm <br />
Dominant geology	Organic (i.e. Peat)
Ecoregion	Fenno-Scandian Shield
Dominant land cover	Woodland
Waterbody ID

Site

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Name	Sub-catchment of Silverån River
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
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
River corridor land use	Woodland
Average bankfull channel width category	5 - 10 m
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	2002/01/01
Works started
Works completed	2005/01/01
Project completed
Total cost category	100 - 500 k€
Total cost (k€)
Benefit to cost ratio
Funding sources	EU, Sveaskog, National Forestry center, Community, Silveråns FVOF

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	Timbet floating
Hydromorphology	Continuity for organisms
Biology	Fish: Disturbance-sensitive species, Invertebrates: Disturbance-sensitive species
Physico-chemical
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Measures

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Structural measures
Bank/bed modifications	Building fishways, Introduction of large stones and gravel, Introducting large woody debris
Floodplain / River corridor
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
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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
Continuity for organisms
Substrate conditions

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		Yes				Improvement
Fish: Disturbance-sensitive species		Yes				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
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Monitoring documents

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Image gallery

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Additional links and references

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Link	Description

Supplementary Information

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