The average discharges of Nyong are analyzed through the annual and seasonal modules. According to the Pettitt test, the annual modules of this river evolve statistically downwards (Figure 4). This decrease is accompanied by a reduction in Cv compared to the post-discontinuity period which seems negligible (−1%) (Table 6). The Pettitt test shows discontinuities in the series of this river in 1973–1974 (Figure 4). The homogeneous sequence following this discontinuity recorded a deficit compared to the long-term average estimated at −5% (Figure 4). However timidly started in the 1970s, the decrease in the annual modules of Nyong increased considerably during the 2000s (Table 5). This decade is the driest of the entire observation period. The decadal deviations from the whole period average for this decade is −7.4% (Table 5).