The month of September was characterized by continued flooding in the Inner Delta and Lower Niger. However, there is a beginning of the recession in the Upper Niger and Middle Niger sub-basins, thus marking the beginning of the end of the rainy season. The peak flow of the exceptional local flood at the Niamey hydrometric station was the cause of serious flooding with loss of human lives and very significant damage. This was the highest flow ever recorded in Niamey since observations began in 1929.
At the level of the structuring dams of Sélingué in Mali and Kainji in Nigeria, the filling of reservoirs has started because of the contribution from rainfall seasons.
The data used for the various analyses below came from hydrological observation networks of the National Hydrological Services and Dam Authorities of nine (9) member countries.
The flow analysis situation was carried out by dividing the basin into four (4) sub-catchments also represented with reference gauging stations as follows: Upper Niger at Koulikoro (Mali), Inland Delta at Dire (Mali), Middle Niger in Niamey (Niger) and Lower Niger at Lokoja (Nigeria)

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