Evacuation or protection? risk analysis as a tool for decision making in the case of a residential building endangered by rockfall [Aussiedlung oder schutz? die risikoanalyse als entscheidungsgrundlage im fall eines durch steinschlag bedrohten wohnhauses]
Sausgruber J.T.,Forsttechnischer Dienst fur Wildbach und Lawinenverbauung |
Molk M.,Forsttechnischer Dienst fur Wildbach und Lawinenverbauung |
Schreiner I.,Forsttechnischer Dienst fur Wildbach und Lawinenverbauung
Geomechanik und Tunnelbau | Year: 2012
In April 2011, a 2 m3 block fell out of a steep rock face in Wipptal, Tyrol, Austria and fell onto a detached house. No one was injured as the house was empty at the time. In a similar event in the 1980s, the garage of a neighbouring house was hit. An initial report found a high danger potential to the house. The house was then evacuated and the inhabitants considered moving out. Regarding the feasibility and possibility of financing protection measures, and as an aid to deciding whether to move out, there is a need for a decision-making basis for the victims and the authorities, and this should be as objective as possible. For this purpose, a risk analysis was carried out including the consideration of engineering- geological, geotechnical and forestry methods. The result of the risk analysis stated a collective personal risk expressed as annual risk of death of 7.2·10-4without protection measures and 4.8·10-6 with protection measures. For the 0.5 km long access road to the house, there was a collective personal risk of 2.3·10-8 without protection measures. The cost of the protection measures was estimated at approx. 130,000 €, and for moving out of the house 450,000 €. © 2012 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.
Weitbacher J.,Forsttechnischer Dienst fur Wildbach und Lawinenverbauung
Osterreichische Wasser- und Abfallwirtschaft | Year: 2013
The Pletschgraben flood retention reservoir is a central component of the flood protection measures implemented between 2006 and 2012 in Pletschgraben, which in orographic terms is a right tributary of the Stübming River with a basin of 1.6 km2, by the Forestry Service for Torrent and Avalanche Control for East Styria. The core concept of the project primarily focused on retaining flood waters and bedload transport upstream of the inhabited area, and in adapting the local canalization to the reduced water levels in the form of a 300 lfm langen Überdeckung. The geologically problematic site of the flood retention reservoir posed major challenges in terms of both planning and actual construction. Thanks to the excellent cooperation between the project team and the Austrian Commission on Reservoirs and Dams, solutions were found that made it possible to erect a reliable, state-of-the-art retention reservoir, despite the difficult geological conditions. © 2013 Springer-Verlag Wien.