Case study:HPP Blanca

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Location: 45° 59' 28.50" N, 15° 22' 52.50" E

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Project overview

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Status	Complete
Project web site	http://www.he-ss.si/pdf/he_blanca-primer_dobre_prakse.pdf
Themes	Fisheries, Hydropower
Country	Slovenia
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
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

HPP Blanca and the fishway on the right part of the dam (http://www.he-ss.si/pdf/he_blanca-primer_dobre_prakse.pdf). .

Project summary

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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

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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).

Lessons learnt

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Image gallery

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Fish pass after construction (Foto: HESS d. o . o. archive).

Electrofishing (on the left) and sampling with fishing net (on the right) on Blanca HPP (photo: D. Zabric).

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) 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: LIFE 06 NAT/SLO/000069 Intermittent Lake Cerknica Site Edit site Name River Sava near settlement Blanca WFD water body codes SI1VT739 WFD (national) typology WFD water body name VT Sava Boštanj – Krško Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Artificially regulated Dominant substrate Gravel, Cobble River corridor land use Extensive agriculture, 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 Edit project background Reach length directly affected (m) Project started 2009/01/01 Works started 2009/01/01 Works completed 2009/08/01 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 Fisheries Research Institute of Slovenia Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Fisheries Research Institute of Slovenia Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydropower Hydromorphology Biology Fish: Species composition, Fish: Abundance, Fish: Disturbance-sensitive species, Fish: Age structure Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications New river-bed near old channel Floodplain / River corridor Planform / Channel pattern Creation of fish passes Other Non-structural measures Management interventions Monitoring of fish in the fish pass Social measures (incl. engagement) Improved cooperation between energy producers and ecologists 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 Flow velocities Yes Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Species composition Yes Fish: Abundance Yes Fish: Disturbance-sensitive species Yes Fish: Age structure Yes 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 Supplementary Information Edit Supplementary Information REFERENCES: 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.