الفهرس 
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Abstract
The area of study occupies a part of the southwestern portion of Sinai and is characterized by arid climate. The study area comprises two main basins; Wadi Baba, in the north, and Wadi Sidri, in the south. Wadi Baba and Wadi Sidri hydrographic basins receive seasonally a considerable amount of rainfall, most of it flows in the form of floods towards the Gulf of Suez. The surface runoff should be conserved or stored to be used in the development of the studied area.
In the present study, and depending on geomorphological, geological, hydrogeological and geophysical measurements and analysis, Wadi Baba is divided into thirteen relatively large sub-basins and Wadi Sidri also has sixth order trunk and is divided into thirty three sub-basins. Evaluation of flash flood hazard has been determined for all sub-basins using some of the available carried out graphical and empirical approaches. from the graphical approach we have basins of domain (A) indicating high groundwater potentiality and low flooding (low risk zones), basins of domain (B) indicating highest flood probability and the least groundwater recharge potentiality (highly risk zones) and basins of domain (C) reflecting intermediate groundwater potentiality and flooding (intermediate risk zones). However from the other empirical approach the studied sub-basins are classified into five orders (1 to 5) representing the flash flood hazards degrees in ascending orders (1 lowest and 5 highest). Sub-basins of domains (B) and for safety (C) and sub-basins of high flood hazard degrees (4 & 5) and for safety (3) must be supplied by a convenient management protection system.
The catchment area of the basins is occupied by four groundwater aquifers namely; the Quaternary alluvium, the Carboniferous sandstone, the Cambrian-Ordovician sandstone and the fractured Precambrian rocks. About 40