Ouémé (river)

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Ouémé
Affon (In the upper reaches)
Mouth of the Ouémé at Cotonou

Mouth of the Ouémé at Cotonou

Data
location BeninBenin Benin
( West Africa )
River system Ouémé
source Atakora Mountains
9 ° 51 ′ 6 ″  N , 1 ° 32 ′ 10 ″  E
Source height approx.  465  m
muzzle Gulf of Guinea ( Atlantic Ocean ) Coordinates: 6 ° 21 ′ 11 "  N , 2 ° 26 ′ 39"  E 6 ° 21 ′ 11 "  N , 2 ° 26 ′ 39"  E
Mouth height m
Height difference approx. 465 m
Bottom slope approx. 0.91 ‰
length 510 km
Catchment area 50,000 km²
Discharge at the Bonou gauge (1733600)
A Eo : 46,990 km²
Location: 50 km above the mouth
NNQ (min. Month Ø)
MNQ 1948–1992
MQ 1948–1992
Mq 1948–1992
MHQ 1948–1992
HHQ (max. Month Ø)
0 l / s
2.7 m³ / s
116 m³ / s
2.5 l / (s km²)
593 m³ / s
1175 m³ / s
Left tributaries Okpara , Beffa, Alpouro, Yérou Maro
Right tributaries Terou , Adjiro, Zou , Donga, Wéwé,
Flowing lakes Nokoué lake

The Ouémé is a river in Benin , West Africa .

geography

Oueme OSM.png

With a length of 510 km and a catchment area of around 50,000 km², the Ouémé is the largest river in the West African state of Benin . Its catchment area extends over almost half of the country. It rises as an affon in the Atakora mountains of Benin and is only called after the mouth of the Alpouro Ouémé. Its course is almost exclusively in a southerly direction. It flows into the Gulf of Guinea on the coast of Benin over Lake Nokoué and the adjoining Porto-Novo Bay near the city of Cotonou .

The Ouémé has an average gradient of 0.9 m / km, in the upper reaches it is 20 m / km. The water temperature varies between 26 and 32 ° C depending on the season.

Hydrometry

The flow rate of the river was measured in m³ / s near the town of Bonou :

River fauna

In a study on Ouémé May 1999 to March 2001 50 fish species from 18 families were ( Protopteridae , Polypteridae , Clupeidae , Osteoglossidae , Mormyridae , Hepsetidae , Alestidae , Distichodontidae , Citharinidae , Bagridae , Claroteidae , Schilbeidae , Clariidae , Mochokidae , Channidae , centropomidae , Cichlidae , Anabantidae ) detected.

literature

  • Lalèyè, PA (2006): Length-weight and length-length relationships of fishes from the Ouémé River in Bénin (West Africa) . Journal of Applied Ichthyology 22: 330-333.

Individual evidence

  1. a b c Egyptian Journal of Chemistry Vol. 60, No. 6, pp. 1077-1090 (2017)
  2. a b GRDC - Bonou gauge
  3. a b Les Ressources en eaux Superficielles - De la République du Benin