Korama

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Korama
Satellite image of the border region between Niger and Nigeria with the Korama

Satellite image of the border region between Niger and Nigeria with the Korama

Data
location Zinder region in Niger
NigerNiger 
origin Sassoumbroum
13 ° 8 ′ 0 ″  N , 8 ° 32 ′ 20 ″  E
muzzle Malawa coordinates: 13 ° 2 ′ 0 ″  N , 9 ° 36 ′ 0 ″  E 13 ° 2 ′ 0 ″  N , 9 ° 36 ′ 0 ″  E

length 125 km
Left tributaries Machaya , Zermou

The Korama is an approximately 125 kilometer long wadi in the south of the Zinder region in Niger .

Course and characteristics

The origin of the wadi lies in the municipality of Sassoumbroum . The Korama is an endogenous system. The aquifer that feeds the river is enriched with water through percolation through the permeable soils in the lowlands and the surrounding slopes. Over its entire length, the wadi has a half-kilometer-wide floodplain that is only flooded for four to six weeks a year.

The river bed describes an arc that initially runs through Kwaya and Bandé to the rural community of Dogo in the northeast. There is the Forêt classée de Korama, a 900 hectare palm grove that was placed under nature protection in 1952. The Korama now swings to the southeast and reaches the rural community of Malawa after Wacha and Dungass , where it ends in the sandy soil of the Sahel zone .

The main tributaries of the Korama are the Machaya and the Zermou , which have their origin in the north.

Korama basin

The Korama Basin, also known as the Korama for short, is a system of several wadis and lowlands that runs through the departments of Kantché , Magaria and Mirriah . The low groundwater level of two to ten meters deep and the presence of numerous small ponds favor the irrigation field management . The overuse of the soil due to increasing human settlement in the vicinity of the city of Zinder , however, had a negative effect on soil quality. The natural tree population of baobabs and ana trees is also on the decline.

Even if the Wadi Korama no longer drains into Lake Chad from above ground , it is geographically in the Komadugu Yobe catchment area. The former course of the river and its confluence with Lake Nguru can be seen on satellite photos .

literature

  • Andreas Rach: Geology and hydrogeology of the southern Korama basin, southeastern Niger . Dissertation, Saarland University 1989.

Individual evidence

  1. ↑ a b R. H. Hughes, JS Hughes: A Directory of African Wetlands . IUCN, Gland 1992, ISBN 2-88032-949-3 , p. 404.
  2. ↑ Mälin Falkenmark, Tom Chapman (Ed.): Comparative hydrology. An ecological approach to land and water resources . UNESCO, Paris 1989, ISBN 92-3-102571-6 , p. 374.
  3. ↑ Données disponibles pour chaque forêt classée ( Memento of July 29, 2012 in the web archive archive.today ). Website of the Direction de l'Environnement, Ministère de l'Hydraulique, de l'Environnement et de la Lutte Contre la Désertification, accessed on 25 February 2012.
  4. ↑ Zibo Zakara, Atahirou Karbo, Jean François Aranyossy: Application of isotopes de l'environnement à l'étude of aquifères of Korama, sud de Zinder (Niger) . In: Les ressources en eau au Sahel. Etudes hydrogéologiques et hydrologiques en Afrique de l'Ouest par les techniques isotopiques . International Atomic Energy Agency (IAEA), Vienna October 1993, p. 97-98 ( naweb.iaea.org [PDF; accessed September 30, 2018]).
  5. ↑ Comité Interministériel de Pilotage de la Stratégie de Développement Rural Secrétariat Exécutif: Le Zonage Agro-écologique du NIGER . Niamey 2004 ( online version ; PDF; 411 kB), pp. 11–12.
  6. ↑ FAO page on Lake Chad