###### Abstract  
Egypt is highly exposed to flash flood hazards, particularly in Sinai Peninsula and along the Red Sea coast, causing sudden and huge damages to constructions and huge losses in human lives during a very short time. This paper investigates the dominant characterization of morphometrical features and their relationships with the hydrological behaviors along an important strip of the western Red Sea coast. The study focuses on analyzing the October 2009 and 2019 storm events along the coastal area between EL-Qussier and Marsa Alam in order to initiate a preliminary flood risk assessment model. Morphometric features along the entire study zone provide a complete scenario of the nature of the catchments and sub-catchments development. Numerous morphometric indexes such as catchments geometry, areal indexes, linear indexes, and relief indexes were examined through processing different sets of data. Modern techniques such as remote sensing and geospatial analysis were applied to process different spatial and spectral data. The hydrological model (HEC-HMS) in the WMS software was run to delineate the catchments and sub-catchments and extract the peak flow hydrograph curves for the main catchments. The results of the water amounts and peak flow were calculated using the SCS unit hydrograph approach. The hydrological characteristics of the major catchments reveal conditions for moderate levels of flash flooding. The study ended with a number of recommendations that could minimize the negative effects of the flash flood hazards. Keywords:natural hazards; flash floods assessment; geospatial analysis; Red Sea coastal line; Egypt +
Footnote †: journal: Medical  
the last 4 decades, flash flooding hazards have caused nearly 2466 fatalities in Europe, while only 458 fatalities were recorded in the Mediterranean regions [10]. Arid and semi-arid regions were hit by the negative effects of flash flooding events as well. For example, catastrophic floods attacked Jordin in March 1966, which destroyed Ma'an City and caused around 200 deaths and 250 serious injuries [7,8]. In Egypt, Sinai Peninsula was battered on the 17 and 18 January 2010 by a flash flood that led to many deaths, injuries, and missing people [11]. During the last 5 years in Saudi Arabia, more than 10,000 houses have been damaged, in addition to 113 deaths because of flood events [12]. Investigation of geological hazards and monitoring their serious impacts on the environment requires comprehensive geo-information and continuous earth observations. Processing of high spatial resolution data through geospatial analysis is a very powerful technology to expand our understanding of the nature of geological landscape developments and geological hazards and aids in investigating the variations in tectonic activity and geological hazards mitigations, particularly along seismically active regions [13, 14, 15, 16]. For example, authors in ref. [14] calculated different morphotectonic indexes to examine the tectonic signals in the Carpathian mountain massif region in Poland. In addition, seismic hazards assessment of active spots was examined by many researchers [17, 18, 19], while others applied the advanced tools to provide insight into the analysis of geological hazards in arid regions [20,21]. For example, authors in ref. [18] attempted to assess the tectonic activity of Mikir massif in India, and they modelled an assessment for irrigation and hydropower development of the study area; on the other hand, authors in ref. [20] established a hydraulic and hydrologic model for the Ayamama River in Turkey. Using GIS technique to generate digital elevation models (DEMs) and extract watersheds and drainage systems is one of the most effective methods in the geospatial technologies [22,23]. The remote sensing technique has provided temporal and spatial information for more accurate monitoring.