The present work, carried out during the years 2000 to 2020 in rainy seasons, aims to describe the impact of excessively abundant alluvium on the flooding of rivers in Uvira. From direct observation of the facts in the field, we have shown that the raising of the beds of the rivers and the obstruction of the outlets of the water of the rivers by too abundant alluvium, are two factors. Which condition the flooding of rivers observed in the city of Uvira for several years? We have proposed reforestation, anti-erosion cultivation practices and systems, the prohibition of untimely bush fires for farmers in all watersheds of watercourses in order to limit erosion based on intense alluvial deposits that cause these river floods

Keywords : Alluvium, Floods, Watercourses, Uvira