Niger - Nigerian part of Lake Chad

The Nigerian part of Lake Chad, covers an area of ​​340,423 ha with an average altitude of 286 m and an estimated depth of 4 m. Located in an arid and semi-arid zone, the area receives very little rainfall with an annual average of 1889.58 mm (about twenty two days of rain per year for a winter season that lasts three months from July to September). The highest temperatures are recorded during the months of April, May and July exceeding 40 ° C. The lowest are recorded in January and are well below 15 ° C and sometimes around 0 ° C. Lake Chad's fluvial inputs come mainly from Logone, Chari and El Bief River at 89%, rainwater at 10% and Komadougou at 1%. However, due to its shallow depth and low volume, the lake does not dampen significant variations in tributary hydrology. Thus, the low floods of 1972-1973; 1973-1974; and 1982-1983 resulted in a significant reduction in area and isolation, followed by drying out of the North Bowl.