Flash floods are dangerous and destructive weather disasters, mostly in arid and semiarid zones. They usually happened quickly in mountain areas exposed to heavy thunderstorms, but dam or levee break can also lead to flash floods. Flash floods frequently cause landslip which have damaging outcomes on constructions and highways, property, and may leads to deaths.
Water shortage in Egypt has certainly become a serious problem. Water uses in Egypt have exceeded accessible water resources because of fast population growth. Ethiopian Renaissance Dam also may lessen Egypt's quota of Nile water. So, Egypt should use novel sources of water, one of which is flash floods water. Flash floods are dangerous, but they present major source to refill aquifers and can become useful by retaining flood water using dams or any suitable water harvesting system.
Flood mitigation is classified to structural and nonstructural choices. Structural procedures as dams, levees, and floodwalls, retarding basins, spur dikes, and etc. alter the features of flood and decrease probable of flood in locations of interest. While nonstructural measures alter the influence flood and have minor influence on flood features. Integral information gotten from remote sensing with other datasets in spatial and non-spatial formats provides enormous possibility to monitor and estimate flood. Level of flood mitigation should be suitable using economic analysis of expenses for rising structure level to the desired heights and direct and indirect revenues achieved by flood mitigation level. A lot of wadi areas in Sinai Peninsula, Eastern desert, Western desert, and South Egypt are prone to flash flood. Studies for flash floods in some Wadi in Egypt are mentioned briefly in this article.