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Using several statistical tests, we divided into homogeneous segments the XXth century long discharges data series and the rainfall data series of the Congo River and of several of its right bank sub-catchments. These tests revealed that the River Congo at Brazzaville experienced a phase of so called stable discharge from the beginning of the XXth century until 1960, a phase of surplus discharge during the 1960s, testimony to its centennial flooding, and then from 1971 onwards, two successive phases of lower discharge. The second one, stretching from 1980 up to now, being the most accentuated with a 10% drop in the total series' interannual discharge (40 600m³s⁻¹). It has only been very recently, in 1990 that the river dropped to its lowest level of the century. The dates at which hydrological discontinuities appear, are observed to be globally similar within practically all of the tributaries studied, the most …