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

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Arrival of mechanisation at the entry to the lake

Excavators are waiting at the entry to the lake for suitable conditions to start work

Preparation of access roads proved to be tricky due to rainfall.

Due to the wet terrain we had to strenghten the access road with gravel.

In 2020, unfortunately the works could not continue due to high water levels.

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name 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 Local/regional site designations Protected species present Invasive species present Species of interest 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) Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications 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 Channel pattern/planform Yes Yes No No Yes Improvement Flow velocities Yes Yes No No No Improvement Quantity & dynamics of flow Yes Yes No No Yes Improvement Width & depth variation Yes Yes No No No Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Macrophytes Yes Yes No No Yes Improvement Macrophytes and/or phytobenthos: Taxonomic composition Yes Yes No No Yes Improvement Macrophytes and/or phytobenthos: Average abundance Yes Yes No No Yes Improvement Invertebrates Yes Yes No No Yes Improvement Invertebrates: Abundance No No No No No Improvement Invertebrates: Diversity Yes Yes No No Yes Improvement Invertebrates: Taxonomic composition Yes Yes No No 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 PH Yes Yes No No Yes Improvement Temperature Yes Yes No No Yes No change Oxygen balance Yes Yes No No Yes Improvement 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 European Commission article about the project http://life.notranjski-park.si/en/ Official project website (English) Supplementary Information Edit Supplementary Information