Case study:Revitalisation of branch ’Felsőszentmártoni’ at River Dráva

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Location: 45° 50' 10.49" N, 17° 42' 30.06" E

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Project overview

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Status	Complete
Project web site	http://www.ddkovizig.hu/tartalom/revitalisation_of_branch_felsoszentmartoni_at_river_drava/311
Themes	Habitat and biodiversity
Country	Hungary
Main contact forename	Alajos
Main contact surname	Burián
Main contact user ID
Contact organisation	South-Transdanubian Water Management Directorate - titkarsag@ddvizig.hu
Contact organisation web site
Partner organisations
Parent multi-site project	Case study:Revitalisation of branch ’Felsőszentmártoni’ at River Dráva
This is a parent project encompassing the following projects	No

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Project summary

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The ‘Felsőszentmártoni’ branch, situated in the region of ‘Felsőszentmárton’ settlement, is one of the left-side branches of River Dráva, which has completely cut-off from the main river by now and silted up significantly. The interventions done are the removal of overgrown salicaceae from the riverbed, the removal of silt along the whole length of the branch and it's deposition into the main channel of River Dráva. The reconstruction of the weir that now prevents proper water flow and thus water replenishment of the branch.

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	Drava
Area category	1000 - 10000 km²
Area (km2)
Maximum altitude category	200 - 500 m
Maximum altitude (m)
Dominant geology	Siliceous
Ecoregion	Alps
Dominant land cover	Extensive agriculture, Grassland
Waterbody ID

Other case studies in this subcatchment: Kleblach-Side channel, Revitalisation of branches ’Boros Dráva and Drávakeresztúri’, Water and Life for Drava and Vuka

Site

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Name	Felsőszentmárton
WFD water body codes	AEP438
WFD (national) typology	14
WFD water body name
Pre-project morphology	Artifical oxbow completely cut-off from the main river, Silted up significantly
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, UNESCO Biosphere Reserve, Natura 2000
Protected species present
Invasive species present
Species of interest
Dominant hydrology	Permanent lentic
Dominant substrate	Gravel, Silt
River corridor land use	Woodland, Intensive agriculture
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)	502502 m³/s <br />502,000 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)	1500 m1.5 km <br />150,000 cm <br />
Project started	2010/11/01
Works started	2011/03/01
Works completed	2012/10/01
Project completed
Total cost category	500 - 1000 k€
Total cost (k€)	596 k€596,000 € <br />
Benefit to cost ratio
Funding sources	European Union and co-financed by the European Regional Development Fund

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			South Transdanubian Regional Development Council and Agency	ddrft@ddrft.hu
Post-project management and maintenance
Monitoring

Reasons for river restoration

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

Measures

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Structural measures
Bank/bed modifications	Dredging: removal of 47, 735 m3 alluvium, Reconstruction of the current weir - height reduction, Pipeline laid in the lower parts of the weir
Floodplain / River corridor	Removal of the overgrown salicaceae trees
Planform / Channel pattern
Other
Non-structural measures
Management interventions	Ensuring biodiversity
Social measures (incl. engagement)	Recreation
Other	Consultation, Information provision

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				Improvement
Continuity for organisms	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	Yes		Awaiting results
Fish: Age structure	Yes	Yes		Yes		Awaiting results

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

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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