Risk of flash floods synchronised with the handling of anthropogenic activities in the city: Case of the city of Khenchela

With the consequences of global climate change, convective and torrential rain are causing severe flooding and major damage, particularly in the city. They play a key role, given the specific characteristics of the city in terms of the size of its population, the impermeability of developed soils, daily activities, car traffic, the dumping of waste and building rubble in run-off waterways, the inadequacy and unsuitability of drainage infrastructures, uncontrolled urbanization, etc. The aim of this article is to address the problem of flooding in cities. The aim of this article is to address the problem of flooding in the town of Khenchela, which has experienced accelerated and uncontrolled growth on flood-prone land in recent decades. The method used is a combination of cartographic visualization in GIS and parametric using the analytical hierarchy process (AHP) method, through research into the impact of natural hazard factors linked to climate change, such as soil type, rainfall intensity, topography and proximity to water channels, on the one hand, and anthropogenic vulnerability factors such as : the grouping of inhabitants in collective housing areas, the mobility of major roads, the concentration of economic activities, and the distribution of school facilities. The results of this study show that 12% of the city's surface area is highly or moderately exposed to the risk of flooding. It also shows that these percentages are recorded in the New Extensions, which have the highest population density in relation to the city as a whole (with 25,000 inhabitants/km²).