Case study:Remediation and revitalization of Séd-Nádor stream

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Location: 47° 6' 27.73" N, 18° 3' 28.29" E

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Project overview

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Status	Complete
Project web site	http://www.sednador-karmentesites.hu/
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 projects	No

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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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Catchment and subcatchment

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Catchment

River basin district	Danube
River basin	Danube

Subcatchment

River name	Séd-Nádor stream (Sárvíz)
Area category	100 - 1000 km²
Area (km2)	733 km²73,300 ha <br />
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

Site

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Name
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)	1616 m <br />0.016 km <br />1,600 cm <br />
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

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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 € <br />
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 € <br />	Séd-Nádor 2009 Consortium	László	Mag
Stakeholder engagement and communication	100 - 500 k€	203 k€203,000 € <br />	Séd-Nádor 2009 Consortium	László	Mag
Works and works supervision	1000 - 5000 k€	3400 k€3,400,000 € <br />	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 € <br />	Séd-Nádor 2009 Consortium	László	Mag

Reasons for river restoration

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

Measures

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Structural measures
Bank/bed modifications	Construction of gravel banks, Removal of sludge, Planting, Creation of fish spawn nursing places
Floodplain / River corridor
Planform / Channel pattern	introducing sinuosity
Other
Non-structural measures
Management interventions	Reduced pollution
Social measures (incl. engagement)
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
Substrate conditions			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			Awaiting results
Invertebrates

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
Specific non-synthetic pollutants			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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