The aim of this report is the analysis of extreme rainfall events in two coastal metropolitan region of Italy: Roma Metropolitan Region (RMR) and Pescara Metropolitan Region (PMR). Daily rainfall data, from 1922 to 2009 for one meteorological station, and from 1951 to 2010 for five stations, were procured from the Regione Lazio - Regione Abruzzo:Ufficio Idrografico e Mareografico. The extreme rainfall events were defined as those exceeding the 95th percentile for each station. Analysis reveals that in RMR the extreme rainfall (95th percentile) varies between 29 and 34 mm/day. The corresponding values for PMR are 31 and 33 mm/day. At Ostia Station (RMR) the rainfall of 198 mm (on October 27, 1953) is the highest ever recorded. At Pescara Station (PMR) the highest rainfall of 216.4 mm was recorded on March 1, 1958. Extreme rainfall events in the metropolitan area of Roma are an important natural hazard especially along the northern Tyrrhenian Latian coast fed by small rivers.
Assessment of Frequency-Magnitude of Extreme Rainfall Events and Flooding - Case study of Rome and Pescara Metropolitan Regions / Bellotti, Piero; Bramati, Maria Caterina; Caputo, Claudio; Davoli, Lina; Evangelista, Silvio; Pugliese, Francesco; Raffi, Rossana; Tarragoni, Claudia. - ELETTRONICO. - (In corso di stampa).