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2020-2021 Hydrological situation PDF Print E-mail
Sunday, 08 August 2021 08:35

The hydrological year at Upper Niger compartment of the Basin was slightly deficient, high at the Inner Delta, very high at the Middle Niger and moderately high at the Lower Niger.
The average flow situation observed at the Inner Niger Delta was due to the inflows from the Bani tributary from CĂ´te d'Ivoire and Mali.
In the Middle Niger, flows from the tributaries of the right bank Dargol, Gourouol,Sirba and Goroubi rivers from Burkina Faso significantly contributed to the wet hydraulicity in this sub-basin of the Niger River.
The Lower Niger experienced a surplus hydrological year due to inflows from left bank tributaries especially the principal River Benue which originates from Cameroon.
The water levels at Selingué dam in Mali and Kainji dam in Nigeria have all reached their full normal reservoir levels respectively and have contributed to support low flow situation downstream.
In summary, the 2020/2021 hydrological year was characterized by some excessive flows causing flooding in the Middle and Lower Niger of the Niger Basin with heights that has never been recorded for more than 100 years. These floods caused loss of lives, properties and thousands of people were made homeless.
The ABN through its Niger Basin Observatory should be more supported in order to provide appropriate and timely information on the hydrological situation of the Niger Basin.

Download the 2020-2021 Hydrological situation

The Niger River has its source from the Fouta-Djalon Plateau more than 1000m altitude in Guinea and successively flows through Mali, Niger, Benin and Nigeria where it empties into the Atlantic Ocean after a span of around 4200 km.
It is the third longest river in Africa (after the Nile and the Congo), the 14th in the world and the 9th by its drainage basin (2,170,500 km2). The active watershed covers an area of approximately 1,500,000 km2 shared by the nine (9) countries within the Niger Basin Authority catchments: Benin (2%), Burkina Faso (4%), Cameroon (4%), CĂ´te d'Ivoire (1%), Guinea (6%), Mali (26%), Niger (23%), Nigeria (33%) and Chad (1%). The River Benue which rises from Adamawa Plateau, Cameroon, to join the main course of River Niger at Lokoja in Nigeria, this is one of its most important tributaries.
The hydrological year of the River Niger starts from June 1st of a year to May 31st of the following year. The annual assessment of the River Niger flow in hydrological year 2020/2021 analyzes the flow situation at designated stations of the different sub-basins: Koulikoro (Mali) for Upper Niger, Diré (Mali) for the Inner Delta; Niamey (Niger) for Middle Niger and Lokoja (Nigeria) for Lower Niger.
The monitoring of River Niger flow during the hydrological year 2020/2021 was carried out under the framework of the activities of the Niger Basin Observatory from 113 hydrometric stations belonging to the hydrological observation networks of National Hydrological Services (NHS) of NBA’s nine (9) member countries. These stations were equipped with gauge scales, some of which are associated with Satlink-type data collection platforms (PCD) (data transmission by satellite) or electronic Liminigraphs (transmission by GSM). All these hydrometric stations have a gauge reader who takes reading daily and monitors the equipment.
The databases of the NHSs and the Executive Secretariat of the NBA are managed by HYDROMET software to facilitate the exchange of data. The data received were duly analyzed and stored in the hydrometric database of the NBA Executive Secretariat.