Flash flood disasters have a significant impact and cause immense damages to lives and infrastructure. This study will assess the risk of flash floods in Gulf of Aqaba Basins (GAB), Sinai Peninsula. Watershed Modeling System (WMS) package was used to automatically delineate the drainage network and determine the hydro-morphological parameters of 33 GAB sub basins via the 90 m Digital Elevation Model files. These data were statistically analyzed applying Multi Criteria Analysis (MCA) technique to create flash flood hazard scale with and without outliers. Based on the resulted hazard scale MCA technique, it was found that 4% of the studied basins with high hazard degree (class five) while moderately high hazardous basins (class four) represent 32%. Class three contained 29% of the studied basins (moderate hazardous). While the moderately low hazardous basins (class two) contained 18% and the rest belongs to low hazardous degree. It is highly recommended to put into consideration this scale before investing in any flash flood protection projects in the study area.