15th International Congress of the Geological Society of Greece Athens, 22-24 May, 2019 | Harokopio University of Athens, Greece Bulletin of the Geological Society of Greece, Sp. Pub. 7 Ext. Abs. GSG2019-356 Assessment of the Geomorphic Impacts of the Flash Flood Event of 15 November 2017 along the Shore of Eleusis Bay (Attica, Greece) D. Griva1, I. Parcharidis1, E. Karympalis1 (1) Harokopio University, Dep. of Geography, El. Venizelou 70, 17671, Athens, Greece,
[email protected] Greece experiences a variety of catastrophic weather events that are frequently followed by severe consequences on social and economic activity. Flash floods have caused tremendous loss of life and property over the past decades (Papagiannaki et al., 2013). The most deadly flood in Greece in the last 40 years occurred on November 15th 2017 in the western part of the region of Attica. A high intensity convective storm with orographic effects reaching up to 300 mm in 8 hours (200mm in only 3 hours) locally in a small area (18 km x 4 km zone) of the western and southern slopes of Pateras mountain caused flash floods along the streams of Agia Aikaterini, Soures and Koulouriotiko with extensive damages in the towns of Mandra and Nea Peramos and the loss of 24 people. Basin-average precipitation rates reached 57 mm/h over Soures stream, 41 mm/h over Agia Aikaterini stream and 140 mm/h in the core of the storm. It is noteworthy that a hydrological simulation study resulted in discharge values about 115 m3/s and water level values exceeding 3 m in Soures and Agia Aikaterini streams which caused the flash flooding around the Mandra area (Varlas et al., 2019).