Case study:Creating a fishpass at Włocławek dam

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Location: 52° 37' 4.00" N, 19° 24' 28.00" E

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Project overview

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Status	Complete
Project web site	http://https://amber.international/portfolio-item/the-wloclawek-dam-poland/
Themes	Habitat and biodiversity, Hydropower
Country	Poland
Main contact forename	Zdzisław
Main contact surname	Zakęś
Main contact user ID
Contact organisation
Contact organisation web site	http://www.infish.com.pl/en/content/about-institute
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Vistula River Natural Stretch. (Katarzyna Suska SSIFI).

Project summary

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The Włocławek dam was equipped with a conventional step-pool fishpass, which initially was functional, but not enough to sustain free fish migration through the dam. After few years of hydropower plant exploitation the bottom erosion below the dam caused gradual decline of fishpass efficiency due to lowering of water level, so it was functional only at high flows. Finally, all but one entrance windows were situated above the water surface at average flow.

- First action to prevent bottom erosion, undertaken by water authorities, was construction of a stabilizing stone ramp of two meters high just 500 m below the dam. This slowed down the bottom erosion, but created a new obstacle for fish migration, especially at low water flows. However there are vivid plans to build a new dam located about 20 km below the existing one to stop the bottom erosion and ensure safety of the existing dam. Such new dam and reservoir will create an additional barrier for fish migration, which was recently improved by the reconstruction of the Włocławek fishpass.

The fishpass at Włocławek dam was recently (2014) reconstructed into vertical slot type, with new entrance window and additional attractive current provided with a pipe. It was equipped with monitoring system, including VAKI scanner that enables constant monitoring of fish passage and fish trap in top fishpass chamber which provides possibility of individual fish measurements, condition assessment and tagging.

Monitoring surveys and results

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In 2016, a total 7818 fish were recorded migrating upstream, mainly in April-May and October. Bream Abramis brama dominated with almost 5000 individuals, followed by anadromous species – sea trout Salmo trutta L., and vimba Vimba vimba at 8111 and 1123 respectively. Asp Aspius aspius, barbel Barbus barbus, catfish Silurus glanis, carp Cyprinus carpio, ide Leuciscus idus, perch Perca fluviatilis, atlantic salmon Salmo salar, chub Leuciscus cephalus, grass carp Carassius gibelio and roach Rutilus rutilus were also noted. The total number of fish were almost two times higher than in 2015 (Dębowski 2017). During present year tens of thousands of records were collected and still under analyzing. Much more numerous in this year is vimba and white bream Abramis bjoerkna. Also, white-eye bream Ballerus sapa was recorded.

In 2016, system with six PIT antennas was lunched in fishpass. First antennae on the entrance, second on the first corner, two next below and above Vaki scanner, fifth on last corner and last on the exit. Nine adult sea trout were caught in trap installed in last fishpass chamber and tagged with 12 mm PITs in November during spawning migration. Tagged fish were released after anesthesia below dam. Four of them again entered a fishway and move upstream. One female which successfully passed was recaptured half year later in Gulf of Gdańsk by commercial fisherman. In 2017 new experiment with three antennae system has been conducted. In 18 October, 112 specimens from nine species included; bream, asp, vimba, sea trout, dace, barbel, ide, white-eyed bream and bleak were tagged and released below the weir. The system is already running.

Lessons learnt

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Image gallery

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Vistula River Natural Stretch. (Katarzyna Suska SSIFI).

Stabilizing stone ramp below the dam on the Vistula River. (Katarzyna Suska SSIFI).

Reconstructed fishpass chamber. (Pawel Prus SSIFI).

Fishpass on Włocławek dam - attracting current is visible. (Katarzyna Suska SSIFI).

Scanner installed in fishpass chamber. (Pawel Prus SSIFI).

Habitats diversity in the Vistula stretch below the dam – picture taken with the use of drone. (Katarzyna Suska SSIFI).

Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name 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 Yes Invasive species present No Species of interest Acipenser oxyrinchus, Atlantic salmon (Salmo salar), Salmo trutta trutta, Vimba vimba, European eel (Anguilla anguilla) Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category more than 1000 m³/s Mean annual discharge (m3/s) 10461,046 m³/s <br />1,046,000 l/s <br /> 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 Works started Works completed 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 Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydropower, Barriers to fish migration Hydromorphology Continuity for organisms, Continuity of sediment transport, Width & depth variation Biology Fish: Abundance, Fish: Species composition Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) 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 Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative 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