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ÖWAV working aid "Condition assessment of Flood Protection Dams as basis for rehabilitation measures"
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ÖWAV working aid "Condition assessment of Flood Protection Dams as basis for rehabilitation measures"
The working aid was elaborated by the Austrian Water and Waste Management Association (ÖWAV) with substantial collaboration by viadonau and finalised in 2017. The working aid is a guideline for a standardised procedure from gathering basic data to the categorisation of flood protection dams and the presentation of priorities for rehabilitation measures. The tool allows for a good overview of the dams regarding their conservation status and the possible risk to protected assets and resources. One key issue is the comparability of results. Therefore, special emphasis was put on definitions, clarifications of the method, the determination of fundamentals as well as the assessment of the dams' conditions and of the areas at risk. By using the tables of the working aid, the possible risk to areas behind the dams can be assessed based on the actual condition of the dam and the potential damage.
In 2017/2018, the working aid was used for the first time for the condition assessment and determination of the need for rehabilitation measures at the DHK dams west of Vienna (approx. 55 kilometres of dam). The condition assessment included all DHK dams that were not either already rehabilitated in the last 15 years or for which rehabilitation measures are already planned or under implementation. In the course of the geotechnical assessment and the accompanying hydrotechnical analysis shortcomings were pointed out and necessary measures determined. The conducted exploration campaign entailed various core drillings and samplings as well as excavator prospecting works in the entire project area. As a result of the condition assessment, a cost estimation and prioritisation for the rehabilitation measures on the examined dams can be made. By the end of 2018, a conclusion could be drawn about the condition of all DHK dams (approx. 165 km).
The project made a substantial contribution to the implementation of measure 21. Maintain, operate and further develop flood protection facilities of the Action Programme for the Danube 2022.
