FLOODS IN EL BAYADH CITY: CAUSES AND FACTORS

M.A. HAFNAOUI, M. MADI, M. BEN SAID, A. BENMALEK

Abstract


Over the last two decades, climatic changes have played a major role in increasing the frequency of floods. El Bayadh city in Algeria has experienced many floods over the last years; the worst flood occurred in October 2011, which affected both population and property.

In this paper, some of the local parameters that contribute to flooding in El Bayadh city were analyzed. These include the constriction caused by urban expansion at the edges of Wadi Deffa, which crosses the city, considerably reducing its cross-section and thereby increasing the risk of flooding. The lack of storm drain designs for severe rainstorms contributes to the stagnation of storm water, further increasing the risk. A reduction in the cross-section of the Wadi leads to a change in the flow velocity, which contributes to the overflow.

To mitigate the risk, a redevelopment of Wadi Deffa in the zones that are at risk of overflow is necessary. For this purpose, a flood hazard map of the October 2011 flood was realized based on a numerical simulation using HEC-RAS software and the ArcGIS system. This map can be used as a reference to plan the necessary actions to mitigate flooding in El Bayadh city.


Keywords


Floods, HEC-RAS, Wadi Deffa, El-Bayadh city, Algeria

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