Case study:Remediation and revitalization of Séd-Nádor stream

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Location: 47° 6' 28", 18° 3' 28"
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Water quality
Country Hungary
Main contact forename László
Main contact surname Mag
Main contact user ID
Contact organisation Séd-Nádor 2009 Consortium
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
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Project summary

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The activity of the Nitrokémia chemical industry was recently terminated, but it's sewage waters left the Séd-Nádor stream along a 125 km long section polluted by toxic metals, which pose a significant environmental risk caused mainly by mercury, cadmium and lead. The aim of the project is to restore and rehabilitate the Séd-Nádor stream by removing the polluted sludge, creating structures in the streambed and by the recultivation of the banks and surrounding area. All interventions are based on an ecological and human health risk assessment.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Catchment and subcatchment


River basin district Danube
River basin Danube


River name Séd-Nádor stream (Sárvíz)
Area category 100 - 1000 km²
Area (km2) 733 km²
73,300 ha
Maximum altitude category 100 - 200 m
Maximum altitude (m)
Dominant geology Calcareous
Ecoregion Hungarian Lowlands
Dominant land cover Intensive agriculture (arable), Plantation forestry, Woodland, Grassland, Wetland
Waterbody ID


WFD water body codes HU RW AAA102
WFD (national) typology AEP819
WFD water body name
Pre-project morphology Single channel, Straightened
Reference morphology Sinuous, Step-pool
Desired post project morphology
Heavily modified water body true
National/international site designation EU - Special Area of Conservation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate Sand, Silt, Gravel
River corridor land use Intensive agriculture (arable), Plantation forestry, Grassland, Wetland
Average bankfull channel width category 10 - 50 m
Average bankfull channel width (m) 16
16 m
0.016 km
1,600 cm
Average bankfull channel depth category 2 - 5 m
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

Reach length directly affected (m)
Project started 2009/03/01
Works started 2011/07/01
Works completed
Project completed
Total cost category 5000 - 10000 k€
Total cost (k€) 5200 k€
5,200,000 €
Benefit to cost ratio
Funding sources National

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design 1000 - 5000 k€ 1470 k€
1,470,000 €
Séd-Nádor 2009 Consortium László Mag
Stakeholder engagement and communication 100 - 500 k€ 203 k€
203,000 €
Séd-Nádor 2009 Consortium László Mag
Works and works supervision 1000 - 5000 k€ 3400 k€
3,400,000 €
Séd-Nádor 2009 Consortium László Mag
Post-project management and maintenance Séd-Nádor 2009 Consortium László Mag
Monitoring 100 - 500 k€ 109 k€
109,000 €
Séd-Nádor 2009 Consortium László Mag

Reasons for river restoration

Mitigation of a pressure
Hydromorphology Substrate conditions
Physico-chemical Specific non-synthetic pollutants
Other reasons for the project


Structural measures
Bank/bed modifications Creation of gravel banks, Removal of sediment, Planting, Creation of fish spawn nursing places
Floodplain / River corridor
Planform / Channel pattern Adding sinuosity
Non-structural measures
Management interventions Reduced pollution
Social measures (incl. engagement)
Other Information provision, Consultation


Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Substrate conditions 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 Awaiting results

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Specific non-synthetic pollutants 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 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. 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. 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. 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. 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. 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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