Methodology to assess vulnerability of roads under hydrogeological events

For a long time the reliability of a road net under calamitous events has been ignored into the management process. Nevertheless road nets have a very important and critical role into the different steps of emergency management. Indeed, to assess the vulnerability of a road net before that a calamitous evet occurs it is necessary, not only to realize emergency and recovery plans, but also to plan apposite adjustment interventions on the net. Nowadays literature shows different methodologies to assess the seismic vulnerability of a road section. We do not have the same informations to evaluate the hydrogeological vulnerability cause of interactive elements complexity. This paper shows the initial phase of a wider research aimed to the definition of a criterion for the valuation of the qualitative and quantitative vulnerability of a road section to hydrogeological events. The first step is the creation of tecnical check-lists that allow to define a qualitative level (low or high) of the vulnerability of a road section and so consequently to assess the reliability and to plan apposite adjustment interventions of the net. The work has been lead and validated through the study of a case record of hydrogeological nature events that interested some roads in the past.