Case study:LIFE 06 NAT/SLO/000069 Intermittent Lake Cerknica

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Location: 45° 44' 33.18" N, 14° 21' 48.01" E

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Project overview

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Status	Complete
Project web site
Themes
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
This is a parent project encompassing the following projects	RESTORATION OF THE GORIŠKI BREŽIČEK STREAM, RESTORATION OF THE TRESENEC STREAM

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Project summary

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In 2006 Notranjska Regional Park acquired financial support from European programme LIFE – Nature for project LIFE 06. The purpose of this project was the establishment of appropriate conditions for protection and conservation of animal and plant species and their habitats on Lake Cerknica. Factors that threaten the biodiversity on Lake Cerknica are modified watercourses, abandoning of meadow mowing and deficient knowledge of nature and its conservation.

With the intention of maintaining biodiversity on Lake Cerknica efforts were oriented to following actions: • Restoration of watercourses, that would contribute to higher water ground level and retaining of overall water level on Lake Cerknica • Composition of a Management plan, which serves as groundwork for managing the project area and is orientated towards conservation of natural and cultural heritage of Lake Cerknica • Mapping of habitat types with the intention of conserving the endangered ones • Land managing including buying, late mowing and mulching on the permanently protected land. • Popularization of the project and education of the youth on the importance of nature conservation.

The aim of the project was the restoration of former meanders and by doing so retaining the water longer in the dry period and increasing the groundwater level in wetland areas. It was expected that in this way the ecological conditions of the wetland areas, and thereby the living conditions for flora and fauna, improve. Inženiring za vode d.o.o. produced the project documentation, based on a review of the situation on the terrain and examining the location of riverbeds as they were before the regulating operations began. More than 12 km of watercourses in the Cerknica area are included in this study.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district	Danube River Basin District
River basin	Danube

Subcatchment

River name	Sava River
Area category	100 - 1000 km²
Area (km2)
Maximum altitude category	200 - 500 m
Maximum altitude (m)	270270 m <br />0.27 km <br />27,000 cm <br />
Dominant geology
Ecoregion	Dinaric Western Balkan
Dominant land cover	Wetland
Waterbody ID

Other case studies in this subcatchment: HPP Blanca

Site

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Name
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	SI141VT2 VTJ Cerkniško jezero (Cerknica lake), Straight
Reference morphology	Sinuous
Desired post project morphology
Heavily modified water body
National/international site designation
Local/regional site designations	No, Ramsar, Special Protection Area
Protected species present
Invasive species present
Species of interest
Dominant hydrology	Ephemeral, Quick run-off, we need to check
Dominant substrate	Silt
River corridor land use	Wetland, Extensive agriculture, Grassland, Woodland
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

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Reach length directly affected (m)
Project started	January/01/01
Works started
Works completed	December/01/01
Project completed
Total cost category	2009 k€"2009 k€" is not in the list (Less than 1 k€, 1 - 10 k€, 10 - 50 k€, 50 - 100 k€, 100 - 500 k€, 500 - 1000 k€, 1000 - 5000 k€, 5000 - 10000 k€, more than 10000 k€) of allowed values for the "Total cost category" property.
Total cost (k€)	1000 - 5000 k€"-5000k€" is not declared as a valid unit of measurement for this property.
Benefit to cost ratio
Funding sources	1840

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design	Ministry of Environment and Spatial Planning k€"Ministry of Environment and Spatial Planning k€" is not in the list (Less than 1 k€, 1 - 10 k€, 10 - 50 k€, 50 - 100 k€, 100 - 500 k€, 500 - 1000 k€, 1000 - 5000 k€, 5000 - 10000 k€, more than 10000 k€) of allowed values for the "Investigation and design cost category" property.
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology
Biology	Quantity & dynamics of flow, Channel pattern/planform, Structure & condition of riparian zones
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	changed bank slope
Floodplain / River corridor	local deepenings, construction of small wooden weir to prevent uncontrolled deepening, coves and bays construction, construction of the overflows between individual meanders
Planform / Channel pattern	retention of water in depressions and stream branches, ground water level rise, slower runoff of low waters
Other	re-instatement of old course;
Non-structural measures
Management interventions	late mowing and mulching on the permanently protected land, mapping of habitat types
Social measures (incl. engagement)
Other	popularization of the project, Information provision, education of the youth on the importance of nature conservation

Monitoring

Hydromorphological quality elements

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quality elements

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

Biological quality elements

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quality elements

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

Physico-chemical quality elements

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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

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

Monitoring documents

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Image gallery

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Lake Cerknica in autumn (Photo: Notranjska Regional Park archive)

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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REFERENCES

LAYMAN’S REPORT Project LIFE 06 NAT/SLO/000069, Intermittent Lake Cerknica, Notranjska Regional Park, Cerknica, december 2009.Smolar-Žvanut N., Fazarinc R., Perič B., Blumauer S., Kavčič I. 2011. The restoration of tributaries of Cerknica Lake and Škocjan Caves Park.