Investigation of geological hazards and monitoring their serious impacts on the environment requires comprehensive geo-information and continuous earth observations. 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. 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. For example, catastrophic floods attacked Jordin in March 1966, which destroyed Ma’an City and caused around 200 deaths and 250 serious injuries. Arid and semi-arid regions were hit by the negative effects of flash flooding events as well. During the last 4 decades, flash flooding hazards have caused nearly 2466 fatalities in Europe, while only 458 fatalities were recorded in the Mediterranean regions. Worldwide, extensive efforts are applied to minimize or cope with the negative effects of this phenomenon nevertheless, flash floods are occurring periodically, causing serious property destruction, serious loss of life, and huge economic damages. According to the International Disaster Database (EM-DAT, 2020 (accessed on )), 46% of natural hazards were floods that affected more than 673 million population between 20. About 44% of the deaths by natural hazards are directly due to surface runoff (flash floods). Storm events or excessive amounts of water reservoir are the main causes of flash flooding. They harm more humans globally each year than any other disaster. Floods are one of the most common and dangerous climate-related natural hazards. Their effects increased from 76% in the 1960s to 83% during the past decade. Climate-related hazard risks represent nearly over two-thirds of natural hazards deaths. During the last 70 years, more than 11,000 disasters triggered by natural hazards have been monitored and recorded. Natural hazards such as earthquakes and tsunamis can be described as sudden events that cause loss of life, widespread property destruction, and huge negative effects on the civilization and population. The study ended with a number of recommendations that could minimize the negative effects of the flash flood hazards. The hydrological characteristics of the major catchments reveal conditions for moderate levels of flash flooding. The results of the water amounts and peak flow were calculated using the SCS unit hydrograph approach. 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. Modern techniques such as remote sensing and geospatial analysis were applied to process different spatial and spectral data. Numerous morphometric indexes such as catchments geometry, areal indexes, linear indexes, and relief indexes were examined through processing different sets of data. Morphometric features along the entire study zone provide a complete scenario of the nature of the catchments and sub-catchments development. The study focuses on analyzing the October 20 storm events along the coastal area between EL-Qussier and Marsa Alam in order to intiate a preliminary flood risk assessment model. 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. 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.
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