Variabilité Climatique Et Régime Des Extrêmes Hydrologiques Dans Le Bassin Versant De L’Ouémé A L’exutoire De Save

This study aims to analyze the influence of climate variability on hydrological extreme regime of Oueme Basin. From chronic data and rainfall rates over the period 1960-2012, various statistical methods were used to assess changes in precipitation, floods characteristics flows, low flows. It first emerges, a marked interannual variability of rainfall, the existence of stationnarity breaks in the series used and second deficit periods characterized by significant decreases in rainfall, river flows. More specifically, it is noted that a decrease of -17, 27% of precipitation during the recession correspond to a deficit of -52.73% of annual runoff. Furthermore, nearly 50% reduction in high water involves cessation of flow at low water. During the last decade, the observed rainfall recovery is accompanied by an increase in high water lined with a severity of low water levels. All the identified changes fit well to the fluctuation of hydropluviometric regime observed in the late 1960s and early 1970s in West and Central Africa. The different results highlighted in this work could be useful to managers of water resources in the development of adaptation strategies to climate change.