The objective of this study is to show the effect of climate change on water resources in the Bandama Basin in Tortiya. To achieve this objective, various data (rainfall, flow rates, temperatures) from different sources and methods (NICHOLSON indices, Hanning order 2 low pass filter, PETTIT test) were used. The application of Nicholson indices associated with the Hanning Filter to the rainfall and hydrological series revealed a climatic variability characterized by an alternation of wet, normal and dry phases. The statistical method of PETTIT indicates a rainfall rupture at the Dikodougou and Sirasso stations, which occurred in 1970 and 1971, respectively. These ruptures mark a modification of rainfall and hydrological regimes. They are accompanied by a decrease in rainfall of 9% in Sirasso and 10% in Dikodougou. The drop in rainfall has resulted in a decrease in the inflow of
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