Risikoanalyse und Kostenwirksamkeit bei der Massnahmenplanung – Beispiel Diesbach | Risk analysis and cost efficiency of measure planning – the example of Diesbach

The region under survey around Diesbach takes in an area of approx. 11.7 km2. Along the perimeter are former rubble and refuse heaps, as well as a number of the typical side channels arising from the protrusions of debris of more recent times. In keeping with the high water flows, along a stretch of about 300 m the Diesbach is channelled along a plaster-coated basin. An integral project, set up in 2000, had the aim of producing a concept for measures to be taken to reduce risk based on a comprehensive hazard and risk analysis. In addition, the project called for the cost efficiency of measures. The elaboration of the project followed guideline set out by the Canton for the protection from natural hazards. Risk analysis, as an instrument of projects aimed at natural hazards, lies at the centre of these guidelines, because it is inadequate to merely identify changes in danger levels. The risk posed by the Diesbach is expressed in an annual expected damage value of approx. 120 000 Swiss francs. The measure c...