Case study:RESTORATION OF THE TRESENEC STREAM

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Location: 45° 47' 47.85" N, 14° 23' 31.84" E

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydromorphology
Country	Slovenia
Main contact forename	Tanja
Main contact surname	Vasilevska
Main contact user ID
Contact organisation	Notranjski regijski park
Contact organisation web site
Partner organisations
Parent multi-site project	Case_study:LIFE 06 NAT/SLO/000069 Intermittent Lake Cerknica
This is a parent project encompassing the following projects	No

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Project summary

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Renaturation of former riverbeds was carried out at specific sections of the Goriški Brežiček and Tresenec streams. Both brooks were rerouted to their former meanders in the length of more than 500 m each.

Monitoring surveys and results

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Floristic inventory and monitoring of the plant species composition of the habitat types in the areas of restored riverbeds as a tool in assessing the changes caused by rerouting the Goriški Brežiček and Tresenec streams. The action will be carried out by the park staff and funded by Notranjska regional Park.

Floristic inventory and monitoring of the plant species composition of the habitat

types in the areas of restored riverbeds of Goriški Brežiček and Tresenec streams in order to notice possible establishing of invasive plant species, for example Himalayan Balsam (Impatiens glandulifera), Canada (Solidago canadensis) and Giant Goldenrod (Solidago gigantea), Cutleaf Coneflower (Rudbeckia laciniata), Topinambur (Helianthus tuberosus) and allochthonous species of the genus knotweed (Fallopia). Establishing is possible because construction machinery used for restoration is known to be disperser of these species and because of the suitable habitat. These plants will be manually removed, should they show up. The action will be carried out by the park staff and funded by Notranjska regional Park.

Suitable management of banks to ensure habitat diversity and accessibility; water weed management to prevent the clogging of the watercourse; dredging of the riverbeds as a rejuvenating process; bank protection to prevent erosion where needed in the areas of restored riverbeds of Goriški Brežiček and Tresenec streams will be implemented. The action will be carried out by the park staff with the external assistance where needed and funded by Notranjska regional Park

Lessons learnt

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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 Danube River basin Sava River Subcatchment River name Tresenec Area category Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) Dominant geology Organic (i.e. Peat), Calcareous Ecoregion Dinaric Western Balkan Dominant land cover Wetland, Extensive agriculture, Woodland Waterbody ID Site Edit site Name watercourses Tresenec WFD water body codes WFD (national) typology SI141VT2 VTJ Cerkniško jezero (Cerknica lake) WFD water body name Pre-project morphology Reference morphology Higher groundwater level Desired post project morphology Heavily modified water body National/international site designation EU - Special Area of Conservation Local/regional site designations Ramsar Protected species present Invasive species present Species of interest Dominant hydrology Ephemeral Dominant substrate Silt, Sand, Gravel River corridor land use Wetland, Extensive agriculture Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m 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 2007/01/01 Works started Works completed 2009/12/01 Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Notranjska Regional Park, Municipality of Cerknica, Ministry of Environment and Spatial Planning Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Notranjska Regional Park Stakeholder engagement and communication Works and works supervision Gradbinko d.o.o. Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Width & depth variation, Continuity of sediment transport Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Local deepening Floodplain / River corridor Planform / Channel pattern Construction of the overflows between individual meanders 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 Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative 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 http://ec.europa.eu/environment/life/project/Projects/index.cfm?fuseaction=home.showFile&rep=file&fil=LIFE06 NAT SI 000069 AfterLIFE.pdf Some information on this page has been copied from this web page. Supplementary Information Edit Supplementary Information