**7. Acknowledgements**

The authors wish to thank the Servizio Idrografico e Mareografico, Direzione Protezione Civile e Ambiente, Regione Abruzzo (Dr. Monica di Michele) for providing pluviometric data of the events and the historical pluviometric data analysed in this work as well as for their useful discussions and suggestions concerning the data processing. The authors wish also to thank the Struttura Speciale di Supporto Sistema Informativo Regionale of Abruzzo Region (http://www.regione.abruzzo.it/xcartografia/), for providing the topographic data and aerial photos used for the geomorphological investigations.
