Assessment of flood risk in kniss wadi catchment in urbain area algiers-algeria

Abstract

The Kniss Wadi catchment, highly urbanized in its northern part, is located in the center of Algiers. Along this wadi, anarchical buildings are developing and a road network is constructed. An exceptional flood may weaken these zones. Flood hazard determination needs a statistic analysis of daily maximum rainfalls, which adjustments to the Gumbel law allows to determinate the maximum rainfall for different return periods. The calculation of maximum discharges linked to different return periods allows the evaluation of overflowing on cross section along the The Kniss Wadi. Hazard maps, obtained show evidence zones that are potentially threatened by flooding. Such maps should be considered and used as main tools to reduce the risk.