The Floods in Arid Areas Case of Catchment of the Valley Béchar, South-West, Algeria

The present work is dedicated to presenting the influence of climatic factors on floods, among the more serious cases known for the region, the floods of October 2008 were caused by heavy rainfall with a height of 108.40 mm. In addition, we are interested in the physical parameters such as the sections and the slope of the valley Béchar, which is at the origin of the disaster. The profile along the valley shows a slope steeper that causes the acceleration of the flow, the calculation of the sections of the valley's various points also reveals the variations at the slope level, which sub-tends to the bad behavior of the water flow at the level of the section reduced. Although it is so, these investigations have guided and alerted us once more on the need for a development-integrated space taking account of regional specificities.