الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Flash floods are natural disasters that occur infrequently and are mainly caused
by heavy rainfall and are characterized by short duration, high flood peaks, and
rapid flows, accompanied by loss of human life and damage to infrastructure in
nearby urban areas. In arid and semi-arid areas such as Egypt, it is difficult to
predict flash floods due to the lack of hydrological and meteorological data. The
national economic plan of Egypt includes the development of the Red Sea
Governorate in the Eastern Desert as a tourist destination, as it is located on the
Red Sea coast and enjoys coral reefs, beautiful nature, a mild climate and a
diving hobby. The city of El Qusir was chosen as a study area, and it is one of
the cities of the Red Sea Governorate, about 140 km from Hurghada and has
historical, commercial and industrial importance, The International Coastal
Road, Safaga-Marsa Alam Road, and Qena El Qusir Road pass through it. It is
located at the outlet of Wadi Al-Ambagi, where it is considered one of the
largest valleys in the region, with an area of 1,536 km² which is often exposed to
flash floods such as occurred in 1934, 1985, 1991, 1994, 1997, 2010, 2014, and
2020. Three dams and a lake were built 5 km from El Qusir city to protect the
city. They are small dams that are enough to protect El Qusir city for 10 years
only, after which it is exposed to the dangers of flash floods. The methodology
of this research is the delineation of the valley boundaries and runoff paths using
DEM and the use of topographic and geological maps. The resulting parameters
were used to predict runoff values for return periods of 5, 10, 25, 50 and 100
years, based on the results of statistical analysis of rainfall data available in 1934
and from 1985 to 2020 from El Qusir meteorological station to make a
hydrological model to produce a hydrograph, and this was done using the (HECHMS) model. HEC-RAS model was made to determine the water depths,
velocities, and flooded areas for a 100-year event. Solutions were proposed to
protect the area from flood risks based on the amount and direction of flooding.
Keywords: Hydrologic model HEC–HMS, 2D hydrodynamic model HEC –
RAS, Flood inundation mapping, Floodplain management, Flash Floods.