Using Remote Sensing Techniques and Hydrological Models in Analyzing Water Drainage Systems Affecting Al-Kharj Governorate

The research investigates water drainage systems and identifying the flooding area in Al-Kharj, which is confluence of valleys Hanifa, Al-Sulay, Al-Hannaya, Nasah, Al-Haytham, Al-Aqimi, then Al-Sahba, with a total 111,491km2, may cause risks on natural human environment whether through accumulation stagnation Low-lying areas resulting environmental hazards, or as result their inundation urban areas, causing destructive effects lives property.The methodology based analyzing affecting city product by many steps multiple inputs that include elements stage before surface runoff occurred during runoff, where collecting largest number each Methods evaluation it, counted analyzed them to create topographical hydrologic model expected rain condition at different recurring times, especially 100 years. morphological analysis basins, comparing results outputs (DEM), tracking paths topographic maps, satellite visuals, field study revealed there mismatch between due interruption flow, either for reasons, it actually affects only 8 basins an 16266.7km2, Hanifa basin consider most nourished volume 124.6million m3 discharge rate 756.4m3/s.