Measures within the IRIS project
Improved flood protection and ecological quality
IRIS stands for “Integrated River Solutions Austria”. While the first phase of the project was characterised by joint, overarching river basin planning, concrete projects are currently being finalised and implemented. The measures on the Traun, Pielach, Leitha, Lafnitz, Enns and Danube combine structural measures with nature-based revitalisation measures thereby combining flood protection with ecological goals.
The measures
In the IRIS project, rivers are given back part of the space that has been lost as a result of intensive river regulation. Rivers can thus once again flow more freely. Interconnected river spaces and floodplains are created characterised by intact ecosystems and great biodiversity. During flood events, these areas function like a sponge. They hold back the water and thus protect settlement areas from flood damage.
Such nature-based solutions have become an indispensable part of modern river management. They fulfill important ecological functions, contribute significantly to flood protection and are often more cost-effective than traditional protection measures, especially in the long term. The reason is that nature can develop here without major interventions and cost-intensive maintenance work, as is necessary in the case of technical structures, is not required.
Local physical protection measures for settlements and infrastructure complement the natural protective effect of nature-based solutions.
Modern river management
In Austria, rivers fulfil many functions that must be taken into account for river management. These include, for example, drinking water supply, navigation and energy supply, but also, for example, the importance of rivers as local recreation areas.
Within the IRIS project, measures were selected to create synergies and added value for people, nature and the environment.
Implemented measures in the pilot areas
Revitalisation measures create new habitats for fish and other organisms.
In the Marktau area near Ottensheim and Wilhering, an existing side arm of the Danube is being extended by about 400 meters. The measures will…
Between Obergrafendorf and Weinburg, the Pielach River will soon be able to flow more freely again. New broadening of the river, raised riverbeds, and more…
New habitats and improved flood protection on the Lafnitz River near Neudau.
After an 8-month construction period, the work on the Enns near Mandling was largely completed in early summer 2023.
In the period from October 2022 to March 2023, a section of the Leitha near Gattendorf was revitalized by reconnecting an old river branch.
Near Stainach, the Enns is being widened in the area of the Leistenbach confluence to give it more space for natural development.
Along the Leitha, structurally rich and lively river sections are being created
