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

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Location: 46° 12' 45", 18° 54' 1"
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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

Case_study:Reduction of Nutrient Discharges Project

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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

Catchment

River basin district Danube
River basin Danube

Subcatchment

River name Old-Danube side arm
Area category more than 10000 km²
Area (km2) 181000 km²
18,100,000 ha
Maximum altitude category 100 - 200 m
Maximum altitude (m)
Dominant geology Calcareous
Ecoregion Hungarian Lowlands
Dominant land cover Woodland, Wetland
Waterbody ID



Site

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) 2400
2,400 m³/s
2,400,000 l/s
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 4500 m
4.5 km
450,000 cm
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 €
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

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

Structural measures
Bank/bed modifications Weir removal, 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

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

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

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://okologia.mta.hu/en Centre for Ecological Research HAS - The institute network of the Hungarian Academy of Sciences is set to produce values for both national and international success in Hungarian and universal science. The Centre's primary aim is to play a fundamental role in promoting the common weal and in building the foundation for the future through valuable scientific achievements based on highly promising discovery research. The Centre consists of three institutes, the Balaton Limnological Institute, the Danube Research Institute and the Institute of Ecology and Botany.
http://www.ovf.hu/ General Driectorate of Water Management - General Directorate of Water Management (OVF) is a background institution of the Ministry of Interior. It supports the work of the Minister regarding the flood management. Its main task is the coordination of flood hazard prevention, river control and flood protection activities, and the management of development projects concerning water bodies. OVF has 12 regional directorates which are coordinating the catchment management planning according to the requirements of the EU WFD. They take preventive and protective measures against floods, carry out status assessments and are the leading organizations in the management and implementation of river restoration projects.
http://neki.gov.hu/ National Institute for Environment - The National Institute for Environment (NeKI) is a background institution of the Ministry of Rural Development, and assists the Minister in the various duties of water management, environmental protection and nature conservation. NeKI has 12 regional branch offices, and is in charge of the strategies, policies and regulations regarding the management and exploitation of water resources. It performs environmental monitoring, status and impact assessments, administrates the national network for hydrological, hydrographical, hydrogeological and quality measurements of public waters. NeKI also coordinates the planning and the implementation of national and EU projects.
http://www.orszagoszoldhatosag.gov.hu/index en.php National Inspectorate for Environment, Nature and Water - The Inspectorate attends to administrational and water management matters, to analyses and consideration of law proposals in its field, and it supervises its 10 regional inspectorates as well. It coordinates international co-operations and takes part in the tasks connected to the EU integration. The regional inspectorates and two sub-offices are the 'green authorities' at first instance. The regional inspectorates are responsible for registration, monitoring, protection, conservation, reconstruction, rehabilitation, authorization and penalty processes regarding environment, nature and water in their assigned territory.
http://wwf.hu/en WWF Hungary - WWF Hungary is the Hungarian arm of the WWF Network and was founded in 1991. It's main aims are protecting the biodiversity of Hungary by focusing on freshwaters, forests and priority species. They are also fighting against climate change and they support WWF's conservation work as well. They participated in the development of the Danube Strategy, as well as organized conservation projects on Hungary's two largest rivers, the Tisza and the Danube.
http://www.icpdr.org/main/ International Commission for the Protection of the Danube River (ICPDR) - The ICPDR is an International Organisation consisting of 14 cooperating states and the European Union. Since its establishment in 1998, the ICPDR has grown into one of the largest and most active international bodies of river basin management expertise in Europe. The ICPDR deals not only with the Danube itself, but also with the whole Danube River Basin, which includes its tributaries and the ground water resources.

Supplementary Information

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