The Study of Prevention of the Dangers of the Torrents and Draining Rainwater of Uqdah in Hail Region, Saudi Arabia

ABSTRACT Fell on the city of Hail, heavy rain caused a huge loss of money, property and lives and claimed the lives of many families have not been counted and in the absence of a discharge of torrents and projects to ward off dangers. Also because it was not taken into account during the adoption of residential schemes over the past thirty years adult home valleys that penetrate the city of Hail path. The foregoing was necessary to study the work of warding off the dangers of flooding and the discharge of flood water, specifically interested in this research study ward off the dangers of flooding and storm water for the Uqdah in Hail region, Saudi Arabia. This is because the torrent of Uqdah valley of the dangers of flooding in the city of Hail. It is known that Uqdah watershed out of the Uqdah and enters the land custodian of the Two Holy Mosques to the people of Hail grant, but where to go after that, no one knows that it has nothing to clear the course in case of heavy rains(this is expected at any moment) . This research includes estimation of the rainwater quantities that falls on a Uqdah area and the expected behavior for rain water in the case of the design storm. To calculate the amount of flood water (Run off), it was to determine the correct value of the coefficient of flood water surplus (Runoff Coefficient) and so in a way practical and theoretical. As well as been identified rainfall concentration time (Tc) by preparing IDF curves are prepared for times of iterative (5,10,20,25,100)years. As well as the run off (torrents)have been identified quantities of water on a Uqdah area using two different methods. The rain distribution and account alheitogerav representative account for the intensity of the rain storm design and hedrogerav unit of the actions of the storm design hedrogerav dispose of total output at the