Case study:Environment-friendly Reduction of Flood Risk in the Multi-thread Reach of the Czarny Dunajec River

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Location: 49° 26' 9.82" N, 19° 51' 31.35" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Hydromorphology
Country	Poland
Main contact forename	Regionalny Zarząd Gospodarki Wodnej w Krakowie
Main contact surname	Regionalny Zarząd Gospodarki Wodnej w Krakowie
Main contact user ID	User:Arolam
Contact organisation	Regional Water Management Board in Kraków
Contact organisation web site	http://www.krakow.rzgw.gov.pl/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Czarny Dunajec River in the Vistula River basin in southern of Poland was restored as the aim of reducing the erosional threat to a nearby road. Initial plan was to reduce the flood risk in the reach through river channelization, rejected and replaced by the proposal to re-activate the flow in side channels and stimulate a natural cut-off of the main channel bend. The object was to increase number of low-flow channels and habitat variability in the reach and to open inlets to side channels and directing the flow to them by deflectors made of gravel. Work was done in summer 2011.

After restoration storage of wood debris in the unmanaged, multi-thread river reach, increased and the risk of channel plugging by the debris in downstream, urbanised valley sections was reduced.

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Environment-friendly Reduction of Flood Risk in the Multi-thread Reach of the Czarny Dunajec River landscape at Czarny Dunajec River

Environment-friendly Reduction of Flood Risk in the Multi-thread Reach of_the_Czarny Dunajec Rivern Braided at Czarny River

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Northern foreland of the Tatra Mountains River basin the Vistula River basin Subcatchment River name The Czarny Dunajec River Area category 100 - 1000 km² Area (km2) 160160 km² <br />16,000 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology siliceous (granitsiliceous (granite, gneiss and quartzite) and calcareous (limestone and dolomite) in the high-mountain part of the basin, siliceous (sandstone and shale flysch) in the lower part Ecoregion Carpathians Dominant land cover forest 50%, extensive agriculture 30%, grassland 20% Waterbody ID Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Czarny Dunajec River 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 Dominant substrate Cobble to pebble River corridor land use Average bankfull channel width category more than 50 m Average bankfull channel width (m) 8080 m <br />0.08 km <br />8,000 cm <br /> Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) 1.21.2 m <br />0.0012 km <br />120 cm <br /> 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 04/2011 Works started Works completed Project completed 2011/12/01 Total cost category 1 - 10 k€ Total cost (k€) 99 k€ <br />9,000 € <br /> Benefit to cost ratio Funding sources funds of the Ministry of the Interior and Administration of Poland 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 Flood risk management Hydromorphology Quantity & dynamics of flow, Structure & condition of riparian/lake shore zones Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Opening inlets to side channels, Creation of gravel deflectors 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