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In this paper we use a multi-hazard approach to analyse the 9 September 2010flash flood in the Dragone basin, a 9 km2 catchment located along theAmalfi rocky coastal range, southern Italy. In this area,alluvial fan flooding has been the most frequent and destructive geologic hazardsince Roman times. Sudden torrents of water (flash floods) are caused byhigh-intensity and very localized cloudbursts of short duration, inducingslope erosion and sediment delivery from slope to stream. The elevated bedload transport produces fast-moving hyperconcentrated flows with significantcatastrophic implications for communities living at the stream mouth. The 9 September 2010 rainstorm event lasted 1 h with an intensityrainfall peak of nearly 120 mm h−1. High topographic relief of theAmalfi coastal range and positive anomalies of the coastal watersconditioned the character of the convective system. Based on geological dataand post-event field evidence and surveys, as well as homemade videos andeyewitness accounts, it is reported that the flash flood mobilized some 25 000 m3 ofmaterials with a total (water and sediment) peak flow of 80 m3 s−1.The estimated peak discharge of only clear water was about 65 m3 s−1.This leads to a sediment bulking factor of 1.2 that corresponds to a flowwith velocities similar to those of water during aflood

The 9 September 2010 torrential rain and flash flood in the Dragone catchment, Atrani, Amalfi Coast (southern Italy)