الفهرس 
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Abstract
Tourism is one of the most important sources of national income in Egypt, as the national
economic plan for Egypt includes the development of the Eastern Desert because of its
beautiful nature and easy access to water activities. Egypt’s eastern desert is characterized
by drought and scarcity of rain. However, heavy rains may occur, resulting in flash floods
extending into the Red Sea coast, accompanied by loss of human life and damage to
infrastructure in nearby urban areas.
In arid and semi-arid areas, it is difficult to predict flash floods due to the lack of
hydrological and meteorological data. Egypt is one of the arid countries facing mainly
flash floods. The Bali Valley in the eastern desert was selected as a case study to predict
flash flooding, and is located 8 kilometers from the tourist city of El Gouna along the
coast of the Red Sea and west of Hurghada-Ismailia Road.
Methodology of this research is to determine the surface runoff flow paths in the study
area and then build a Hydrological model to predict the surface runoff values for the return
periods of 5, 10, 25, 50 and 100 years. Finally, Building a two-dimensional hydraulic
model, unsteady flow analysis of the current situation, and producing flood inundation
maps. This study depends on topographic and geological maps and rainfall data available
from the rain gauge station in Hurghada from 1969 to 2019. Solutions have been proposed
to protect the area from flood risks based on the amount and direction of floods. This
study can be applied in different regions of Egypt and arid and semi-arid regions the world
Keywords: Hydrologic model HEC–HMS, 2D hydrodynamic model HEC – RAS,
Flood inundation mapping, Floodplain management, Flash Floods.