干旱区生态环境知识资源中心

Entirely landlocked country CHAD is classified as Sahelian to the characteristics of its following climatic zones :Saharan in the north,Sahelo-Saharan and Sahelo-Sudanian in the middle and Sudano-Guinean in the south where the rainfall decreases by risen in latitudes.The productive sector,basis of the economy largely dependent on climatic variability.Such as the cases of 1973 and 1984 years where the little or no rainfall was recorded leading to the very serious consequences to the economy in general and the most vulnerable in the arid and semi-arid zones societies in particular.The 1975 and 1988 years in the hydrological view point were wet;

This paper examines through available observed meteorological and hydrological data I rainfall and runoff) from selected stations within chosen catchments by latitude for understanding the behavior of Chari-Logone river basins,the main inflow to the Lake Chad,a great regional water reservoir shared by 4 boundaries countries during the susmentioned periods.