Case study:Removal of the migration barriers for aquatic organisms on the river Wisłoka and its tributaries – Ropa and Jasiołka

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Location: 49° 39' 16.62" N, 21° 9' 34.68" E

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Project overview

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Status	In progress
Project web site	http://wislokabezbarier.com/
Themes	Environmental flows and water resources, Flood risk management, Habitat and biodiversity
Country	Poland
Main contact forename	Piotr Sobieszczyk
Main contact surname	Karol Ciezak
Main contact user ID	User:KarCie
Contact organisation
Contact organisation web site	http://krakow.wody.gov.pl/
Partner organisations
This is a parent project encompassing the following projects

Ropica Polska – Ropa River

Project summary

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Aim of the project The aim of the project is a restoration of the possibility of free migration of fish and other aquatic organisms down and up the river Wisłoka and its tributaries, with the simultaneous maintenance of the stability of water intake and other elements of the infrastructure. The strategic aim of the project is an improvement of the ecological state of the Wisłoka water according to the requirements of the Water Framework Directive. This is one of the statutory duties of the Regional Water Management Board in Cracow and is an element of the Plan of the water management in the area of the upper Vistula basin.

Origin of the project One of the characters of the natural river environment is a patency of the watercourse, it means lack of the barriers preventing the migration of fish and aquatic organisms. Fish in particular year seasons and life periods migrate along the river in search of food, appropriate shelters and places for spawning. Partition of the river with weir or other artificial barrier disturbs these processes what negatively affects number and condition of fish, and in extreme cases when access to spawning areas situated upstream is cut off, can lead to extinction of the whole populations.

The construction of damming buildings and regulation works carried out in riverbeds in the second half of the XX century lead to vanishing of the specific habitats necessary for spawning, spawn incubation, fry growth and also feeding and wintering of adult organisms. It finally resulted in the extinction of sturgeon, salmon, sea trout and vimba whereas the populations of other fish species requiring shorter, one-environment migration were heavily cut down. For this reason it is necessary to restore the patency of the flow what in practice means the necessity of removal or modernization of the weirs in a such way that they don’t cause an obstacle for aquatic organisms.

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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 National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest 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 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 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 Barriers to fish migration Hydromorphology Biology 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