The river basin of Oued Tiflet forms part of the river basin of Wadi Sebou, so it is characterized by multiple forms of soil degradation, and this situation is linked to several overlapping factors, where plateau and plain topographies prevail in it, but its natural surroundings show several indications of true fragility. Soil is characterized by its ability to erode in relation to the predominance of fine materials over its constituent elements, and the region's climate is characterized by irregularity in precipitation and heat, which increases the severity of fragility. All this in light of the great weakness in the level of natural vegetation coverage, which is clearly declining in terms of area and type, and the demographic factor represented by the increase in population has contributed, on its part, to perpetuating the state of environmental imbalance, by increasing pressure on resources of all kinds, as Demographic increases have pushed the population to massive exploitation of the agricultural and pastoral fields with the expansion of urbanization processes, and the methods adopted by farmers often accelerate the phenomenon of erosion. This intervention aims to analyze the problem of land degradation in the River Basin of the Tiflet Valley, by using modeling by applying the composite index of land degradation. It aims to identify, on the one hand, the forms and mechanisms of degradation, while knowing the effect of this dynamic on the stability of natural environments, and on the other hand, on the various forms aimed at reducing the phenomenon of land degradation in the Tiflet Basin.

Tiflet Basin, Water Erosion Modeling, Land Degradation, Synthetic Indicator of Land Degradation.

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