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
Themes
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).

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 surveys and results

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Lessons learnt

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Catchment and subcatchment

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(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

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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

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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

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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

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Structural measures
Bank/bed modifications	new river-bed near old channel
Floodplain / River corridor
Planform / Channel pattern	creation of fish pass
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

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quality elements

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

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
Fish: Species composition		Yes
Fish: Abundance		Yes
Fish: Disturbance-sensitive species		Yes
Fish: Age structure		Yes

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

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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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).

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:

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

HESS d. o. o. Brežice. 2010. Prehod za vodne organizme na HE Blanca. Availabe at: http://www.he-ss.si/pdf/kratek-opis.pdf