Case study:RESTORATION OF THE GORIŠKI BREŽIČEK STREAM

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Location: 45° 47' 46", 14° 21' 45"
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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
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Project summary

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Construction of small wooden weir to prevent uncontrolled deepening.

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

Catchment

River basin district Danube
River basin Sava River

Subcatchment

River name Goriški Brežiček
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

Name watercourses Goriški Brežiček
WFD water body codes
WFD (national) typology SI141VT2 VTJ Cerkniško jezero (Cerknica lake)
WFD water body name
Pre-project morphology Straight
Reference morphology Sinuous, 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) 0.16
0.16 m³/s
160 l/s
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


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 TGM Bizjak
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology Width & depth variation, Continuity of sediment transport
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications excavation in the U form, coves and bays construction, Weir construction
Floodplain / River corridor Creation of a flood expansion area
Planform / Channel pattern Re-instatement of old course, Adding sinuosity
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

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

Biological quality elements

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

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

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


Monitoring documents



Additional documents and videos


Additional 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

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