Tapoa (river)

Tapoa
East Burkina Faso with the Tapoa (middle right)
Data
location	Burkina Faso Niger
River system	Niger
Drain over	Niger  → Atlantic
source	Matiakoali Parish 12 ° 14 ′ 30 ″  N , 0 ° 53 ′ 35 ″  E
muzzle	in Niger coordinates: 12 ° 32 ′ 55 "  N , 2 ° 31 ′ 21"  E 12 ° 32 ′ 55 "  N , 2 ° 31 ′ 21"  E
length	260 km
Catchment area	5500 km²
Discharge at the gauge W A Eo : 5330 km²	MNQ 1963-1967 MQ 1963-1967 Mq 1963-1967 MHQ 1963-1967	0 l / s 1 m³ / s 0.2 l / (s km²) 4.5 m³ / s
Rock formations at the Tapoa in Niger

The Tapoa is a tributary of the Niger in the states of Burkina Faso and Niger .

course

The river has a total length of 260 km and a catchment area of 5500 km². It runs roughly from west to east. It rises in the community of Matiakoali in Burkina Faso, where it crosses the N6 highway . Then he reaches the province of Tapoa named after him . There it initially forms the border between the municipality of Kantchari in the north and the municipality of Partiaga in the south. It then flows through the municipality of Diapaga , where it forms a large reservoir in front of the first Tapoa dam before it crosses the N19 road. The bed slope varies greatly depending on the river section. It is 12 cm / km in the upper reaches to Diapaga.

In the middle section, the gradient increases to 21 cm / km. The Tapoa is now the border river between the communities of Diapaga and Botou , flows through the Tapoa-Djerma hunting area and forms the northern boundary of the cross-border National Park W from the last few kilometers before the state border between Burkina Faso and Niger . The Tapoa is the border river between Burkina Faso and Niger for a good 20 kilometers before it flows on through the Nigerian community of Tamou . The 60 km long Borofwanou flows into the Tapoa as the only notable tributary . Within Niger, it marked the border between the W National Park in the south and the Tamou game reserve in the north. The second Tapoa dam , built not far from the village of La Tapoa , is primarily used to supply the wild animals with water during the dry season. Here the river falls about 20 meters at a waterfall.

The gradient reaches 70 cm / km from the second Tapoa valley weir to the confluence with the Niger River. The Tapoa finally flows curvy through a narrow gorge.

Hydrometry

Average monthly flow of the Tapoa measured at the hydrological station named W in m³ / s.

geology

The gentle lowlands which flows through the Tapoa in its upper reaches, are one body area of granite and dolerite .

The relief, which is more pronounced in the lower reaches, consists of sedimentary formations and sandstone from the Paleozoic . There are phosphate stores in the Nigerian section of the Tapoa . In 1981 , Niger signed an agreement with Nigeria to exploit them , but mining has barely progressed since then.

Web links

Commons : Tapoa (river)  - collection of images, videos and audio files

Individual evidence

1. ↑ ^{a b c d e} Y. Brunet-Moret, P. Chaperon, JP Lamagat, M. Molinier: Monographie hydrologique du fleuve Niger . Tome II: Cuvette Lacustre et Niger Moyen. Orstom, Paris 1986, ISBN 2-7099-0790-9 , pp. 261 ( hydrosciences.fr [PDF; accessed September 25, 2018]).
2. ↑ ^{a b} Monograph Hydrologique du Bassin du Niger - 1ère Partie le Niger Superieur et le Bani
3. ^ ^{A b} Y. Brunet-Moret, P. Chaperon, JP Lamagat, M. Molinier: Monographie hydrologique du fleuve Niger . Tome II: Cuvette Lacustre et Niger Moyen. Orstom, Paris 1986, ISBN 2-7099-0790-9 , pp. 276 ( hydrosciences.fr [PDF; accessed September 25, 2018]).
4. ↑ Inventaire des petits barrages du Niger . Economic Commission for Africa (UNECA), December 1996, p. 5–6 ( repository.uneca.org [PDF; accessed September 23, 2018]).
5. ↑ Abdourahmane Idrissa, Samuel Decalo: Historical Dictionary of Niger . 4th edition. Scarecrow, Plymouth 2012, ISBN 978-0-8108-6094-0 , pp. 429 .