Case study:Vén-Duna (Old-Danube) sidearm’s revitalization

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Location: 46° 12' 44.92" N, 18° 54' 0.63" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Monitoring, Water quality
Country	Hungary
Main contact forename	Bela
Main contact surname	Csanyi
Main contact user ID
Contact organisation	„VITUKI” Environmental and Water Management Research. Institute Non-Profit Public LLC
Contact organisation web site
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 aim of the project was to obtain knowledge and experience on possibilities how to restore natural hydro-morphologic conditions and the connectivity between the river and floodplain zone. The main objective of the implementations was to provide a direct water flow connection between the Danube main stream and the side arm in order to restore the natural biodiversity and rheophilic communities typical for aquatic floodplain landscapes. The re-opening was accompanied by an extensive scientific research and monitoring program, which showed changes in riverbed morphology upstream and downstream of the rock dam. Restored high floods increased sediment transport, erosion and deposition. Suitable habitats for rheophilous invertebrate and fish species as well as species diversity and population numbers typical for dynamic water bodies increased.

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	Danube
River basin	Danube

Subcatchment

River name	Old-Danube side arm
Area category	more than 10000 km²
Area (km2)	181000 km²18,100,000 ha <br />
Maximum altitude category	100 - 200 m
Maximum altitude (m)
Dominant geology	Calcareous
Ecoregion	Hungarian Lowlands
Dominant land cover	Woodland, Wetland
Waterbody ID

Site

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Name	Vén-Duna (Old-Danube) sidearm
WFD water body codes	AEP444
WFD (national) typology	Danube between Szob and Baja
WFD water body name
Pre-project morphology	Artifical oxbow cut-off from the main river
Reference morphology	Sidearm
Desired post project morphology
Heavily modified water body
National/international site designation	EU - Special Area of Conservation
Local/regional site designations	National Park, Natura 2000, Ramsar
Protected species present
Invasive species present
Species of interest
Dominant hydrology	Lentic
Dominant substrate	Sand, Silt
River corridor land use	Intensive agriculture (arable), Urban, Plantation forestry
Average bankfull channel width category	more than 50 m
Average bankfull channel width (m)
Average bankfull channel depth category	5 - 10 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)	24002,400 m³/s <br />2,400,000 l/s <br />
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	4500 m4.5 km <br />450,000 cm <br />
Project started	1992/04/01
Works started	1998/08/01
Works completed	2004/09/01
Project completed
Total cost category	50 - 100 k€
Total cost (k€)	66 k€66,000 € <br />
Benefit to cost ratio
Funding sources	RIZA (Institute for Inland Water Management and Waste Water Treatment of the Netherlands)

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design			RIZA (Institute for Inland Water Management and Waste Water Treatment of the Netherlands)
Stakeholder engagement and communication			„VITUKI” Environmental and Water Management Research. Institute Non-Profit Public LLC
Works and works supervision			„VITUKI” Environmental and Water Management Research. Institute Non-Profit Public LLC
Post-project management and maintenance			„VITUKI” Environmental and Water Management Research. Institute Non-Profit Public LLC
Monitoring			„VITUKI” Environmental and Water Management Research. Institute Non-Profit Public LLC	Bela	Csanyi

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology	Substrate conditions, Quantity & dynamics of flow, Continuity for organisms
Biology	Fish: Abundance, Fish: Species composition, Phytoplankton: Blooms
Physico-chemical	Nutrient concentrations, Oxygen balance, Temperature
Other reasons for the project	Recreation, Landscape enhancement, Community demand

Measures

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Structural measures
Bank/bed modifications	Removal of weirs, Dredging
Floodplain / River corridor	Construction of new sluices
Planform / Channel pattern
Other
Non-structural measures
Management interventions	Ensuring biodiversity
Social measures (incl. engagement)	Recreation
Other	Information provision, Consultation

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
Quantity & dynamics of flow	Yes	Yes		Yes		Improvement
Substrate conditions	Yes	Yes				Improvement

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	Yes	Yes			Improvement
Invertebrates	Yes	Yes				Improvement

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
Nutrient concentrations	Yes	Yes		Yes		Improvement
Oxygen balance	Yes	Yes		Yes		Improvement
Temperature	Yes					Improvement

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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Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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