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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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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

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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

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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

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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

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Structural measures
Bank/bed modifications	Opening inlets to side channels, directing the flow by deflectors made of gravel
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
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

Biological quality elements

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quality elements

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Physico-chemical quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents

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Image gallery

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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

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Supplementary Information

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