Risk analysis and risk management in Maesstobel

Abstract

The catchment area of the Maesstobel in Vorarlberg (Western Austria) has a potential rockfall volume of up to 800,000 m3. Even a smaller rockfall can already block the suggadin river. A subsequent dam failure would cause severe damages to the town of St. Gallenkirch. In order to get reasonable Hazard zone maps, hydrological and 2-D hydraulic simulations were carried out. To secure a bypassing road and to warn the inhabitants of the valley and the construction workers at site an early warning system was installed.