الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Water, both surface and subsurface, is one of our most essential and vital natural resources. The increasing in utilization of water due to the overpopulation can causethe problem of water shortage. Therefore, the re management of the different water resources in Egypt is mandatory. By solving this problem, the new population settlements can be created away from the high population areas in the Nile valley. In addition, reclaiming desert areas and transfer it to cultivated areas can be manifested. It is evident, however, that the Northwestern coastal zone may be considered as one of the most promising areas for these new settlements.
In the Mediterranean coastal zone of Egypt, surface water is considered as the main water resources, which comes directly from rainfall or indirectly from surface runoff. Generally, surface runoff occurs in the form of flash floods through numerous wadis dissecting the Tableland Plateau to the south of the coastal plain. In Mersa Matruh area, the main source of water is rain fall, which recharge the groundwater aquifers by infiltration from surface runoff, and it is used for irrigation and domestic purposes. The strong floods cause a great damage to the constructions such as roads, buildings, railways, etc.
Therefore, the application of harvesting techniques for surface runoff to avoid these damages plays an outstanding role in the creation of new settlements. So, it is mandatory to study flash flood, their frequencies, rates, quantities and the flood control system optimization in order to convert this phenomenon to useful information providing us with the optimum amount of water. Many techniques were developed to simulate the rainfall runoff relationship in order to predict and control flash floods.
1.2. Location
The present work is concerned mainly with El NegilaRas El Hekma area, which is located in the central part of the Northwestern coastal zone of Egypt (Fig. 1.1). This area extended from 50 km East of Mersa Matruh to 66 km West of Mersa Matruh. It extends about 116 km along the coast and 30 km maximum width inland. The study area is located between latitudes 31˚04’59” N & 31˚30’00” N and longitudes 26˚33’14” E & 27˚45’00” E.