Flash flood hazard are the most important problems that threaten the development of the world in general and the study area in particular. A number of climatic, geological and geomorphologic factors as well as population growth and the accompanying urban growth, have accelerate the risks of floods during the past two decades. The study aims to examine hydrological and morphometric characteristics and their impact on the floods in the Governorate of Muttrah Sultanate of Oman and its impact on the infrastructure, using remote sensing technologies and GIS through the methodology of spatial compatibility analysis and statistical analysis to determine the volume of discharged water, areas subject to flash flood, and degree of risk zones, and to build a database of risks of floods and to suggest best solutions to minimize their impact. The results of the study have shown several effects of the climatic, topographic and hydro morphometric characteristics of water basins and drainage networks in accelerating flash floods in the study area. Most of the areas that are subject to are located under the 4-meter contour line, of frequency basis of 50-year below the 5-meter line, and of frequency basis of 100-year below the 6-meter line; 32.92 thousand m/s, 128.98 thousand m's sand 255.72 thousand m/s. Finally the study suggested and recommended some solution in order to mitigate the risks of flash flood in the study area.