Abstract
Sahelian lakes particles matter suspended contents in relation with water table and rainfall ambivalence : case of Bangou Kirey and Bangou Bi (SW Niger) River and lake silting is the most dramatically consequences of climate changes and human pressure in the Sahel. Silting rate like 2 to 3 cm/year has been fund in some lakes or rivers near of Niamey (SW Niger). 385 Afrique SCIENCE 12(2) (2016) 384-392 Amadou ABDOURHAMANE TOURE et al. This work aimed to determine the impacts of water table and rainfall variabilities on the amount of particles matter suspended (MES) which participate to the silting of Lake Bangou Kirey and Bangou Bi. Thus, it appeared that Bangou Kirey watershed is wider and it is maintained by enormous kori so it contained at least more than 30 times MES concentration than Bangou Bi. Nevertheless, Bangou Kirey MES concentration has been inversely impacted by water table and rainfall. This concentration has been diluted by the water table rising. In another way, the important and frequent rainfalls of the second part of the rainy season (after mi-July) marked less the MES concentration. But the first rainfalls caused important erosion thus they leaded a continue increasing of the MES concentration in Bangou Kirey.