Case study:HPP Blanca
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- 1 Project overview
- 2 Image gallery
- 3 Catchment and subcatchment
- 4 Site
- 5 Project background
- 6 Reasons for river restoration
- 7 Measures
- 8 Monitoring
- 9 Additional documents and videos
- 10 Additional links and references
- 11 Supplementary Information
|Project web site||http://www.he-ss.si/pdf/he_blanca-primer_dobre_prakse.pdf|
|Main contact forename||HESS d. o. o.|
|Main contact surname||HESS d. o. o.|
|Main contact user ID|
|Contact organisation||HESS d.o.o.|
|Contact organisation web site|
|Parent multi-site project|
| This is a parent project
encompassing the following
The fish pass on HPP Blanca is the first case of fish way on Sava river HPPs. It is located on the right part of HPP Blanca dam and constructed in the way of imitation of natural watercourse with hydrological characteristics, morphology, materials and varied habitat. The water level in the accumulation lake is changing for 1 m on the daily basis, which is why the inflow in fish pass has vertical slot pass with hydraulic barriers. Water velocity in the fish pass does not exceed 1 m/s. The flow is adjusted on fish migration and hydraulic scheme of the accumulation lake (http://www.he-ss.si/pdf/he_blanca-primer_dobre_prakse.pdf).
In order to bridge the differences in elevation, which is 9.4 m, the length of crossing is 680 m. Of these, 110 m of concrete section (intake facility on the upstream side) and 570 m of sustainable segment, in which also the culvert under a public road and drainage section is included (designed to attract fish). Water outflow from the fish pass itself attracts fish (http://www.he-ss.si/pdf/kratek-opis.pdf).
Monitoring surveys and results
After the construction of HPP and fish way in 2009 the monitoring began and is still going on. The method used was electrical hunting and fish nets. In 2011 also telemetry was included in monitoring. Results showed that 32 of 40 fish in Sava river on the area of HPP Blanca was evidenced in the fish way (among them also Chrondrostoma nasus), since the beginning of the monitoring, which is good result.
The base for this project, which was done by IBE d. d., was interest in fish species composition in lower Sava river, the assessment of population size for each species, biological characteristics and ecological needs of species. Recommended guidelines and literature about fish passes were basis for the project scheme. The fish experts from Fisheries Research Institute of Slovenia were included in the project from the beginning, which is very good progress in cooperation between experts and energy producers. Even more progress can be done with founding the permanent monitoring of fish way function and maintenance (http://www.he-ss.si/pdf/he_blanca-primer_dobre_prakse.pdf).
Monitoring of fish in the fish pass.
Catchment and subcatchment
Select a catchment/subcatchment
Other case studies in this subcatchment: LIFE 06 NAT/SLO/000069 Intermittent Lake Cerknica
Cost for project phases
Reasons for river restoration
Hydromorphological quality elements
Biological quality elements
Physico-chemical quality elements
Additional documents and videos
HESS d. o. o. Brežice. 2010. Prehod za vodne organizme na HE Blanca. Availabe at: http://www.he-ss.si/pdf/kratek-opis.pdf
Zabric D. 2011. Prehodi za ribe pri HE Blanca – primer dobre prakse. Življenje vodi, str. 19–22. Availabe at: http://www.he-ss.si/pdf/he_blanca-primer_dobre_prakse.pdf
Zabric, D. 2010. Ihtiološki pregled na HE Boštanj in HE Blanca - Monitoring ribje steze HE Blanca. / Ichtyological research at the HPP Boštanj and HPP Blanca – Monitoring of the fish migration aid at HPP Blanca. Report. Ljubljana.
Zabric, D., Jenic, A., Videmšek, U. 2012. Ihtiološki pregled na HE Boštanj in HE Blanca v letu 2012. / Ichtyological research at the HPP Boštanj and HPP Blanca in 2012. Report. Ljubljana.