Case study:Renaturation of Stržen's riverbed on intermittent Cerknica Lake

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Location: 45° 44' 52.48" N, 14° 22' 57.90" E

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Project overview

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Status	In progress
Project web site	http://ife.notranjski-park.si/en/
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydromorphology, Social benefits
Country	Slovenia
Main contact forename	Irena
Main contact surname	Likar
Main contact user ID
Contact organisation	Notranjska Regional Park
Contact organisation web site	http://www.notranjski-park.si/en
Partner organisations	Institute of the Republic of Slovenia for Nature Conservation, HIDROTEHNIK Vodnogospodarsko podjetje d.d., The Fisheries Research Institute of Slovenia, DOPPS – BirdLife Slovenia
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 main objective of the LIFE STRŽEN project is to improve the conservation status of the Habitats Directive priority habitat, Turloughs, by restoring the former Stržen riverbed. The watercourse will be prolonged by 1.5 km. This will have several positive effects, including an increased saturation of soil with water that will improve conditions for characteristic species of fish, invertebrates, birds and mammals. The project also aims at reducing the negative impact of visitors on the restored riverbed area and establishing quiet zones in the breeding habitat of the Eurasian bittern (Botaurus stellaris) in order to improve its breeding success. A further aim is to gain long-term support for its conservation actions among the general public, and a positive change of attitude among key stakeholders. Thus, the objectives are strongly linked to the EU Habitats and Birds directives, Biodiversity Strategy 2020, and Water Framework Directive.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Watercourse Stržen – Cerknica Lake WFD water body codes SI141VT2 WFD (national) typology WFD water body name VTJ Cerkniško jezero (Cerknica Lake) Pre-project morphology Artificially straight Reference morphology Desired post project morphology Sinuous - double meander Heavily modified water body No National/international site designation International - RAMSAR site Local/regional site designations Regional Park – protected area Protected species present Yes Invasive species present No Species of interest Great Bittern (Botaurus Stellaris), Common snipe (Gallinago gallinago), Spotted crake (Porzana porzana), Little Crake (Porzana parva), Marsh Harrier (Circus aeruginosus), Ruff (Philomachus pugnax) Red-necked grebe (Podiceps grisegena), Great white egret (Ardea alba), Purple heron (Ardea purpurea), Savi's warbler (Locustella luscinioides), Water rail (Rallus aquaticus), Great reed warbler (Acrocephalus arundinaceus), Northern shoveler (Anas clypeata), Ferruginous duck (Aythya nyroca), Wood Sandpiper (Tringa glareola), Italian crested newt (Triturus carnifex), Otter (Lutra lutra), Lesser Ramshorn Snail (Anisus vorticulus)… Dominant hydrology 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 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) 15001,500 m <br />1.5 km <br />150,000 cm <br /> Project started 2017/09/01 Works started Works completed Project completed 2022/08/31 Total cost category 1000 - 5000 k€ Total cost (k€) 38633,863 k€ <br />3,863,000 € <br /> Benefit to cost ratio Funding sources EU Contribution: € 2, 863, 212.00 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 Land drainage Hydromorphology Quantity & dynamics of flow, Width & depth variation Biology Fish, Invertebrates Physico-chemical Temperature, Oxygen balance, Nutrient concentrations Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Riverbed restoration Floodplain / River corridor Establishing of quiet zones Planform / Channel pattern Re-instatement of old course – double meander 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=search.dspPage&n proj id=6296#EI All information on this page is copied from this EU Life page http://life.notranjski-park.si/en/project-objectives/ Slovenian page of project Supplementary Information Edit Supplementary Information