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[This article belongs to Volume - 57, Issue - 05]

Abstract : In the SafSaf river basin, heavy rain related floods are the natural hazards that is mostly feared by riparians. These floods are becoming a burden in terms of both human and material damages. Over the years, governments have made some structural adjustments to protect civilians and goods in the most vulnerable municipalities. Nevertheless, the damage caused by November 2004 and February 2011 heavy rainfalls showed the reduced effects of such techniques and, therefore, the necessity to review the effectiveness and appropriateness of these measures. The frequency study, the correlation analysis by least squares method of extreme rainfall and runoff data recorded at the Khemakhem and the treatment of major historical floods have helped develop some empirical models to extrapolate, to lacking hydrometric equipment watersheds, the results of design flood discharge calculation (10 year, 50 year and 100 year floods) and to define reference floods that are required to prepare flood risk prevention plans (PPRF) for the most vulnerable communes in the studied area. The results obtained indicate areas prove to flooding with a very high risk of flooding occurring mainly in the lowlands near the drainage network. These results can supply an open flow hydraulic model to provide, for any profile, the width of the flooded zone, the height of submergence, the discharges, and velocities of flow. Such data are required for flood hazard mapping as defined in PPRI’s. These documents of public interest meet, at a time, the requirements of protection, prevention, and preservation of properties in floodplains within the context of sustainable development.