Rainfall-discharge relationship and water balance over the past 60 years within the Chari-Logone sub-basins, Lake Chad basin

Chari-Logone River basin, Lake Chad basin. The objective of this study was to better understand the hydrological functioning basin under effect high variability rainfall which has affected Sahel during last sixty years. is based on hydro-climatic data for period between 1960 and 2015 obtained from national international institutions. This work following steps: 1) Average balances were estimated different geographical areas, identify most productive parts 2) rainfall-runoff relation compared wettest driest decades period, areas that contribute amplification response variations in rainfall. 3) long-term stability evaluated climatic conditions close average situation, order detect potential evidence anthropogenic impact. During 1960–2015, water flow (42 mm/year) represented only 5% precipitation. Between two climatically contrasted wet (1960−1971) dry (1982−1997) periods, differed by 75 % against a decrease 15 Our hydroclimatic show no clearly detectable an impact responsible flows or modification regime