Niéri Ko

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Niéri Ko
Niéri Ko in the Gambia catchment area

Niéri Ko in the Gambia catchment area

Data
location SenegalSenegal Senegal
River system Gambia
Drain over Gambia  → Atlantic
Headwaters 13 km east of Toulékédi
14 ° 37 ′ 37 ″  N , 12 ° 32 ′ 1 ″  W
Source height approx.  110  m
muzzle 75 km north of Guinea and 44 km east of Gambia Coordinates: 13 ° 20 ′ 53 "  N , 13 ° 22 ′ 41"  W, 13 ° 20 ′ 53 "  N , 13 ° 22 ′ 41"  W
Mouth height 16  m
Height difference approx. 94 m
Bottom slope approx. 0.37 ‰
length 253 km
Catchment area 11,757 km²
Discharge at the bridge level of the N 7
A Eo : 11,900 km²
Location: 3 km above the mouth 		NNQ (1979-05-10)
HHQ (1969-08-29) 		19 l / s
14.2 m³ / s

The Niéri Ko is a river in the West African state of Senegal .

geography

The Niéri Ko is a right northern tributary of the Gambia in the east and southeast of Senegal. Its catchment area lies entirely in the Tambacounda region and although it is the largest of all the catchment areas in the river system, the Niéri Ko only contributes very modest amounts of water to the total outflow of the Gambia, because it has the furthest north-reaching basin with the lowest amounts of rainfall highest evaporation rate. With annual precipitation between 600 mm in the north and 1000 mm in the south, which is concentrated in the months of July, August and September, the area is a dry savannah . In the dry season, the Niéri Ko and its tributaries only carry water in places. In the north, the river valleys show clear signs of erosion from heavy rain. They are sunk into the surrounding savannah with steep slopes without vegetation, and more trees have developed in the valley floor due to the greater proximity to the groundwater. South of Goudiry , the first smaller town near the river, these traces of erosion are disappearing and the vegetation is becoming thicker. The lower reaches of the Forêt de Diambour , about 1250 km² in size , to which the Niokolo-Koba National Park connects in the south .

The Niéri Ko rises in the northeast of the Tambacounda region near the 120  m high step that forms the watershed to Senegal , which flows past just 28 kilometers to the northeast . The source river with the longest valley path and at the same time the furthest from the mouth (168 kilometers as the crow flies) starts 13 kilometers east of Toulékédi and 30 kilometers south of the city of Bakel on the banks of Senegal . The headwaters are located in a valley head about 110 m high. The source river initially follows a general westward direction for 20 kilometers before turning its course to the south, showing a very stretched valley path with few turns. After 77 kilometers, he finally passes the small town of Goudiry. At kilometer 111 it takes on a first stronger tributary from the left and east, the Goundoré. In the further course of the Niéri Ko becomes significantly more winding.

A particularly important place on the river is the rural community of Goumbayel at kilometer 174. Here the paved D512 road coming from Tambacounda in the west crosses the river with a bridge. Furthermore, a river level was set up here, but only eleven measured values ​​from the period 1978 to 1982 are documented.

The Niéri Ko at kilometer 196 from the left is reinforced by the Balamboulou, followed by the Mayél Samou , the strongest tributary of all, at kilometer 209.

Finally, the Niéri Ko flows into the middle reaches of the Gambia at the Campement de Wassadou and has covered 253 kilometers by then. At the mouth, the river bed is 9 meters wide, while the Gambia flows here to about 80 meters wide.

traffic

Both the national road N 1 , which leads from Dakar in the west to Tambacounda and on to the Malian border to Kayes , and the parallel Dakar – Niger railway cross the dry valley of the Niéri Ko near Goudiry . The N 7 passes through on the way from Tambacounda in the northwest to Kédougou in the southeast of the river three kilometers upstream of the mouth with a 60 meters spanning bridge.

Individual evidence

  1. ↑ Source height according to OpenCycleMap
  2. ↑ Measure distances with google maps
  3. ↑ ORSTOM - OMVG: Monograph Hydrologique Du Fleuve Gambie (Status: 1987) Niéri Ko on page 30 of the PDF file 3.81 MB
  4. ^ Level: Monograph page 178 of the file
  5. ^ Annual rainfall: monograph page 56 of the file
  6. ↑ Forêt de Diambour at Geonames
  7. ^ Toulékédi at Geonames
  8. ↑ Goundoré at Geonames
  9. ↑ Goumbeyel: Monograph page 176 of the file
  10. ↑ Balamboulou in Geonames
  11. ↑ Mayél Samou at Geonames
  12. ↑ Measure distances with google maps

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