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

A flash flood on September 9, 2010, in the Dragone catchment of Atrani, Italy, mobilized approximately 25,000 cubic meters of sediment with a peak flow velocity comparable to clear-water floods. The event, characterized by an intense one-hour rainfall peak of nearly 120 mm/h, resulted in a hyperconcentrated flow with a total discharge of 80 m³/s and a sediment bulking factor of 1.2. The study employed a multi-hazard approach, integrating geological data, post-event surveys, eyewitness accounts, and homemade videos to analyze the flood's impact. High topographic relief and coastal water anomalies influenced the convective system, contributing to the catastrophic nature of the event. This research highlights the significant sediment transport and velocity dynamics in flash floods along the Amalfi Coast, offering insights into the region's frequent alluvial fan flooding hazards.

Violante, C., Braca, G., Esposito, E., & Tranfaglia, G. (2016). The 9 September 2010 torrential rain and flash flood in the Dragone catchment, Atrani, Amalfi Coast (southern Italy). Natural Hazards and Earth System Sciences, 16(2), 333–348. https://doi.org/10.5194/nhess-16-333-2016