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Sota River

Sota
Origin Near Ndali, Benin, Borgou Department
Mouth Niger River at Malanville
Basin countries 23x15px Benin
Length 150km
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Basin area Script error: No such module "convert".

The Sota is a river of northern Bénin flowing through the departments of Borgou and Alibori. It is a tributary of the Niger River. The river is approximately 250 km in length and covers a basin area of 15,000 km2 and flows through towns such as Malanville.

Geography

The Sota begins northeast of the town of Ndali in the territory of Benin in the Borgou department. The river runs toward the north-north-east and at the end of course it empties into the Niger River at Malanville.

Rainfall

The annual precipitation has been recorded at several stations in the basin of the Sota:

  • Segbana (center-east of the basin, near the Nigerian border): 1177.4 mm spread over 53 days.
  • Kandi (center-west of the basin): 1055.1 mm, spread over 80 days
  • Malanville (at the north end of the basin at the confluence with Niger): 919.9 mm in 53 days

There is everywhere a large surplus rainfall from July to September (boreal summer), giving rise to violent floods, but the deficit is a severe dry season from December to April.[1]

Hydrometry

The flow of the river has been observed for 40 years (1953-1992) at the hydro station in Couberi, located near its confluence with the Niger River at Malanville.

At Couberi, the average annual flow module or observed during this period was 31 m³ / second for an area taking into account 9111 to 13,410 km ². The monthly average flows observed from February to April are from 3.7 to 3.9 m³ / second, which is quite remarkable in Africa at its discretion, with other rivers in the region falling consistently enough to nearly dry up in the dry season. It is true that the level of rainfall of 900 to 1200 mm per year is very consistent. On the observation period of 40 years, the minimum monthly flow was 2 m³ / second, while the maximum monthly flow amounted to 358 m³ / second which is more than the average flow of the Seine in Paris.[2]

Average monthly flows of Sota (m³ / second) measured at the hydrometric station Couberi. (Data calculated over 40 years)

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References

External links