Natural disasters are considered one of the most serious threats facing people, as they cause many human and material losses annually, and dealing with them has become one of the issues that concern countries and international communities, especially in developing countries. Floods are among the most severe natural hazards that affect urban facilities and road networks in dry and semi-arid desert areas, which are characterized by scarcity of rain and fluctuations in time and space, especially since urban policies have neglected this aspect in most cities of the Kingdom of Saudi Arabia, as many cities suffer from urban sprawl. Calculation of valleys and streams of torrents and obliteration of their features (National Center for Water Research, 2010) Most of the previous studies in the field of torrential risk were not able to succeed in clarifying the risks facing cities in an accurate way that helps decision-makers to manage risks. Perhaps the reason is due to the obliteration of the natural features of the reefs and valleys during successive periods of time. The flood risk management process includes several stages, including the stage of knowing the risk, predicting its size, the stage of dealing with it during the event, the stage of determining the damages and determining the time period for recovering from them. However, these operations must be accompanied by the provision of correct and accurate data and information in the form of reports, graphs and maps that help him estimate future needs and build an integrated program to ward off those risks. The process of collecting and analyzing data and information to reach accurate results and reports depends on it