Case study:Silverån övre

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Location: 57° 32' 48", 15° 44' 33"
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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
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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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district
River basin Emåns River Basin

Subcatchment

River name Silverån River
Area category 100 - 1000 km²
Area (km2) 122 km²
12,200 ha
Maximum altitude category 200 - 500 m
Maximum altitude (m) 232 m
0.232 km
23,200 cm
Dominant geology Organic (i.e. Peat)
Ecoregion Fenno-Scandian Shield
Dominant land cover Woodland
Waterbody ID



Site

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

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 European Union, 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

Mitigation of a pressure Timbet floating
Hydromorphology Continuity for organisms
Biology Fish: Disturbance-sensitive species, Invertebrates: Disturbance-sensitive species
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Introduction of gravel, Introducing large woody debris, Creation of fish passes
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological 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

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
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Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



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Additional links and references

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Supplementary Information

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