Case study:LIFE IP IRIS Enns Mandling Restoration

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Location: 47° 24' 2.34" N, 13° 33' 34.29" E

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Project overview

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Status	Complete
Project web site	http://life-iris.at/en/massnahmen/new-river-enns-near-mandling/
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Social benefits
Country	Austria
Main contact forename	Martin
Main contact surname	Wenk
Main contact user ID	User:Martin.wenk
Contact organisation	BML
Contact organisation web site	http://https://www.bml.gv.at/
Partner organisations	Land Salzburg
Parent multi-site project	LIFE IP IRIS
This is a parent project encompassing the following projects	No

During Construction in 2023

Project summary

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After an 8-month construction period, work on the Enns near Mandling was mostly completed in early summer 2023. Here, two former river loops of the Enns were restored.

The result? A natural and lively river that can once again flow more freely and constantly changes. Natural processes are creating new gravel and sand banks in the renaturalized sections and deep pools alternate with shallow, flooded areas. As a result of these measures, the river is once again better connected with the surrounding area and the water balance is more in equilibrium. In the event of a flood, water can be buffered in such areas and flooding in the settlement area is reduced.

The positive effects are already clearly visible. The ecological condition of the River Enns has improved noticeably and the river and the adjacent banks are an important habitat for many native animals and plants.

Monitoring surveys and results

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tbd

Lessons learnt

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Early negotiations with landowners are crucial!

Image gallery

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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 Enns Subcatchment River name Enns Area category Area (km2) 60846,084 km² <br />608,400 ha <br /> Maximum altitude category Maximum altitude (m) 27112,711 m <br />2.711 km <br />271,100 cm <br /> Dominant geology Central Eastern Alps Ecoregion Alps Dominant land cover Waterbody ID Other case studies in this subcatchment: Conservation strategies for forest and wild river in Gesaeuse: the Johnsbach Beck restoration, Conservation strategies for forest and wild river in Gesaeuse: the River Enns restoration 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