The issue of natural hazards in general and flooding in particular is a hot topic which marks memorable actions in the world and specifically in Algeria. Managing this risk is becoming more of a necessity that must include all stakeholders and all possible means available. The objective of this work is the vulnerability mapping of flood areas in the arid region Oued M'zabregion Ghardaia. It's about implement predictive models and flood control. This allows the development of a risk prevention plan to flooding. To achieve this goal we evaluated the hazard and vulnerability. The evaluation of the risk passes by a study of the mode of rising. This study leads to the determination of the synthetic hygrogram which are taken into account under the boundary conditions upstream of a hydraulic model of the nonpermanent flows on free face. The results obtained for one period of return given constitute the risk of the floods relating to these hydrograms. The vulnerability is represented by a rate which translates the objective of protection against a probable risk. Two types of models are tested on a section of Oued M'zab-region where the data are available. Initially, are considered hydrological models (HEC-HMS 1D). In the second place of the hydraulic models (HEC-RAS 1D). After comparison of the results obtained by various simulations, the vulnerable zones are thus charted.

The objective of the present study is to present the parameters of the hydrological assessment of a steppe area from the data of remote sensing. Adopted methodology rests on the cartography of the various parameters of the hydric and energy balance on one year scale. Several methods are used. Thus, for cartography of precipitations, one uses in a combined way the relief, the distance of the sea and the exposure. The second method is used for the cartography of the streaming on an each pixel scale. This method utilizes a matrix which calls upon the information contained in space variability and information resulting from the first method. The combination of information of precipitation and the streaming allow the development of the chart of infiltration. The third method consists with the estimate of the evapotranspiration on broad scale. This last method uses images AVHRR and the model of assessment of energy Surface Energy Balance Algorithm for Land (SEBAL). The quality and the space precision of these cartographies using imagery NOAA AVHRR open a broad hydrological field of application and can be extended for the exploration of all the Algerian steppe area.