Case study:Hainburg River Restoration

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Location: 48° 8' 47.04" N, 16° 55' 39.23" E

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Project overview

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Status	Complete
Project web site	http://www.donauauen.at/?story_id=1713
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology
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	via donau
Parent multi-site project	Case_study:National Park Danube-Auen
This is a parent project encompassing the following projects	No

Hainburg River Restoration, courtesy of Donau-Auen National Park

Project summary

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This project involved the removal of all artificial elements strengthening the banks of a river section on the Danube's left bank across from the city Hainburg. In the entire lower section of the project area, all stone and boulder supports were removed from a length of around 2.1 km. Because the upper section exhibited a nascent overhanging bank character, it was necessary to safeguard the embankment at the height of the regulated low water level, heeding however navigational requirements. In the long term, the new riverbank should

• allow a natural and structurally multi-facetted riverbank landscape to develop
• bring about a continuous lateral shift of the bank edge and thus cultivate the associated erosion, siltation, and fluctuation zones and keep these in dynamic interplay in the long run
• work to counteract the formation of riverbank formations
• intensify the extent to which high water can replenish the riparian woods, inflow channels and bodies of water
• improve the groundwater connection between main stem and wetlands and keep it open in the years to come.

Indeed, shortly after construction had ended, the restoration potential of the landscape became clear: the flowing water had caused the river bank line to recede. After only a few months, the first signs of riverine habitat rejuvenation were observed in the flat sections of the inside bends. In particular the pioneer sites, the early succession stages and the wetland meadows were aided. Thus the highly-endangered species which find their home in these wetland habitats will be able to utilise them for a long time to come.

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Catchment and subcatchment Select a catchment/subcatchment 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