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The paper examines the flash flood events that occurred over a decade inthe Attica prefecture, the most urbanized region of Greece, with the aim ofidentifying triggering rainfall thresholds, as well as assessing the effectof rainfall upon the magnitude of the induced damages. The analysisincorporates rainfall records from a network of 28 surface meteorologicalstations and information on the spatial distribution of the flash floodevents that is derived from the active database of damaging weather eventsmaintained by the atmospheric modelling group of the National Observatory ofAthens. The main findings concern firstly the relation between the flashflood impact, as measured by the fire service operations in floodedproperties, and precipitation in various time intervals. In the period2005–2014, 48 damaging flash flood events occurred in the target area andcaused more than 3500 fire service operations in flooded properties. Mostof the events are associated with maximum accumulated rainfall of more than 20 mmin 24 h and 3 mm in 10 min. However, the flash flood impactintensity, as measured by the number of the fire service operations perevent, increases significantly above the levels of 60 mm in 24 h and 10 mm in10 min. Secondly, graphs of rainfall intensity versus duration aredeveloped for 15 sub-areas of Attica in order to define rainfall intensitythresholds for flood triggering at a more local level. It is shown thatconclusions regarding the reliability of the estimated thresholds shouldtake into account the representativity of the rain gauges, which isdetermined by the local network's density, the gauges' location and recordlength

Flash flood occurrence and relation to the rainfall hazard in a highly urbanized area