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Local-Scale Risk Analysis and Mitigation of Debris Flow Endangering a Densely Populated Urban Area: A Case Study from Tyrol, AT

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Engineering Geology for Society and Territory - Volume 3

Abstract

Debris flows present a serious threat to Alpine settlements and infrastructure. A case in point is the city Innsbruck (Tyrol, Austria). In case of extremely heavy precipitation in the Höttingerbach catchment, located in the city’s north-west, flooding and debris flow may endanger Innsbruck’s district Hötting. The calculation of the debris flow risk and the discussion of the type and impact of a potential risk mitigation measure, are presented in the following. The risk analysis consisted of the following steps: (a) determining debris flow hazard potential; (b) estimating damage potential of material assets and persons; (c) combining (a) and (b) to calculate the societal risk. The results of the risk analysis revealed Hötting’s high susceptibility towards debris flow and flooding, with 542 houses and over 4,100 persons potentially exposed. Therefore, a risk mitigation measure was elaborated, consisting of a water retention basin near the apex of the alluvial fan. An analysis of the potential impact of this measure on the risk situation showed a distinct reduction of the potential damage to material assets and persons as well as a positive cost-benefit ratio.

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Correspondence to Florian Riedl .

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Riedl, F., Adams, M.S., Maier, C. (2015). Local-Scale Risk Analysis and Mitigation of Debris Flow Endangering a Densely Populated Urban Area: A Case Study from Tyrol, AT. In: Lollino, G., Arattano, M., Rinaldi, M., Giustolisi, O., Marechal, JC., Grant, G. (eds) Engineering Geology for Society and Territory - Volume 3. Springer, Cham. https://doi.org/10.1007/978-3-319-09054-2_2

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