The month of June marks the commencement of the hydrological year in the Niger Basin. The precipitation recorded in all the River Niger Catchments occurs a rise in flow which is characterized by flash floods, at the rate of local rainfall. The average monthly flow recorded show an increasing flow from upstream to downstream. The discharging of water reservoirs from structural dams continues to support the downstream flow.
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 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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