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
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Contact organisation	WWF
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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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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) 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 Edit 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 Edit 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 Edit reasons for 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 Edit 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 Edit 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 Edit 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 Edit Physico-chemical 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information