Case study:Witzelsdorf Pilot Project

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Location: 48° 7' 38.17" N, 16° 50' 42.59" E

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Project overview

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Status	Complete
Project web site	http://www.donauauen.at/?story_id=1713
Themes	Environmental flows and water resources, Flood risk management
Country	Austria
Main contact forename	Stefan
Main contact surname	Schneeweihs
Main contact user ID	User:Nationalpark Donau-Auen
Contact organisation	Nationalpark Donau-Auen
Contact organisation web site	http://http://www.donauauen.at/?area=nationalpark&language=english
Partner organisations
Parent multi-site project	Case_study:National Park Danube-Auen
This is a parent project encompassing the following projects	No

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Project summary

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Another milestone in revitalization for via donau in 2009: completion of construction of a riverbank restoration project at Witzelsdorf in the Donau-Auen National Park. The Witzelsdorf section of the river had been one of the most heavily built-up along the entire Danube. Thus ideal conditions prevailed here for a restoration aiming to improve the overall ecological situation: to encourage the momentum and formative power of the Danube and to initiate the natural development of the shore. Project measures included:

• Removal of eight old groynes and field experiments involving novel, ecologically-optimized groyne structures
• Lowering of existing retaining walls to 0.5 meters above the low navigable water level (LNWL)
• Riverbank restoration on a stretch nearly two kilometres long between river kilometres 1891.7 and 1893.4 with preservation of bank revetments to just over LNWL in areas of strong currents.

Approximately 30,000 m3 stone material was removed from the banks and transported away by ship. The National Park provided professional support for this project in collaboration with the project team. The Witzelsdorf restoration project was co-financed by the Federal Ministry of Transport, Innovation and Technology (BMVIT) and the trans-European networks of the European Union. Meanwhile, the Danube has been busy forming her newly-won natural banks. The second riverbank restoration project in the Donau-Auen National Park is thus a veritable success story.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Danube River basin Danube Subcatchment River name Sava River Area category more than 10000 km² Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) 833833 m <br />0.833 km <br />83,300 cm <br /> Dominant geology Calcareous Ecoregion Dinaric Western Balkan, Alps Dominant land cover Waterbody ID Other case studies in this subcatchment: Conservation of alluvial, Hainburg River Restoration, INTERREG MED WETNET - Memoradum on Participation in Wetland Conservation in Ljubljansko Barje Nature Park, Marsh protection in Egyek–Pusztakócs, National Park Danube-Auen, Regelsbrunner Aue, Renaturation of Stržen's riverbed on intermittent Cerknica Lake, The Bulgarian Wetlands Restoration and Pollution Reduction Project Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category 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 Edit project background Reach length directly affected (m) Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information