DISCHARGE LIQUID, VECTOR OF TOTAL SUSPENDED SEDIMENT (TSS) OF MAYO TSANAGA AT MAROUA (FAR NORTH CAMEROON)

Mayo Tsanaga is the Cameroonian part of the Lake Chad Basin ungauged. The knowledge of discharge is essential for the design of hydraulic structures and for hydrological risk prediction. The objective of this study is to evaluate discharge, total suspended sediment and the deduction of the specific sediment yield. The exploration of velocity fields and the differences in the pre and post filtration filter weights were adopted as a methodology. The results revealed that annual discharges of Mayo Tsanaga at Maroua from 2012 to 2014 are respectively 1.94 ± 0.38 m3 /s, 2.18 ± 0.43 m3 /s and 0.89 ± 0.17 m3 /s. Mayo Tsanaga discharge will be used when sizing the second bridge on this river. Mayo Tsanaga's daily mean concentrations of TSS are respectively 429.384 mg/L ± 12.88 for the year 2013 and 17.45 ± 0.52 mg/L for the year 2014. The corresponding specific sediment yield (SSY) of Mayo Tsanaga are 34.92 t.km-2 .year -1 in 2013 and 0.57 t.km-2 .year -1 in 2014. The SSY expresses the amount of ground lowering for the whole catchment.