The month of May marks the end of the hydrological year in the Basin. The hydrological situation of the Niger Basin during the month was characterized by the continuation of the low water situation throughout the Basin. However, localized rainfall was recorded in some compartments of the Basin, particularly in the Upper Niger and Lower Niger.
The Sélingué water reservoir in Mali and Kainji water reservoir in Nigeria continue to release water to support the flow situation in the basin.
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 of Niger Basin Authority. (NBA)
The flow analysis situation was carried out by dividing the basin into three (4) sub-catchments also represented with reference gauging stations as follows: Upper Niger at Koulikoro (Mali), Inland Delta at Dire (Mali), Middle Niger at Niamey (Niger) and Lower Niger at Lokoja (Nigeria)

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