Ruvyironza River

Template:Short description Template:Template other The Ruvyironza (or Luvironza) River (Template:Langx) is a river in Burundi, the main tributary of the Ruvubu River. Its headwaters are the most remote source of the Nile when measured by river length from the Nile's mouth.

Course

The Ruvyironza rises in the east of Bururi Province to the west of Mount Kikizi ().Template:Sfn It forms near Kiryama and the RIG6 / RP83 junction, where its tributaries the Nyabuyugi and Kibazwa come together.Template:Sfn It flows northwest to the border with Gitega Province. It follows part of the border between these two provinces, then flows through Gitega Province to the border with Mwaro Province, and follows the Mwaro-Gitega border north before turning east and again crossing Gitega Province to its mouth on the Ruvubu River.Template:Sfn Most of the rivers in the Nile Basin portion of Burundi flow into the Ruvubu or its main tributary, the Ruvyironza.Template:Sfn

Source of the Nile

The Luvironza River is the source of the Nile in the sense that it is in the Nile basin, and the distance by river from its headwater to the mouth of the Nile is , longer than the distance from any other headwater.Template:SfnTemplate:Efn It is a tributary of the Ruvubu River, a tributary of the Kagera River, which flows in Lake Victoria. From there, the river takes different names as it flows north: the Victoria Nile, Albert Nile, Bahr al Jabal, White Nile and north of Khartoum the Nile.Template:SfnTemplate:Sfn

Environment

The surroundings of the upper Ruvyironza are mainly savannah.Template:Sfn The area is quite densely populated, with 239 inhabitants per square kilometer as of 2016.Template:Sfn The average annual temperature in the area is . The warmest month is September, when the average temperature is , and the coldest is April, with .Template:Sfn Average annual rainfall is . The wettest month is December, with an average of of precipitation, and the driest is July, with of precipitation.Template:Sfn

At Nyabiraba in central Gitega Province the Ruvyironza has a drainage basin, with average flow of . Annual precipitation is and average temperature is .Template:Sfn The laws regarding the public hydraulic zones are not respected in any of the Ruvubu watersheds, but particularly along the Ruvyironza. This results in frequent landslides of the unprotected river banks.Template:Sfn

Marshes

The Ruvyironza basin contains of marshes, of which , or 87%, were exploited for agriculture by 1998.Template:Sfn The Ruvyironza flows along the eastern boundary of the Commune of Gishubi in Gitega, separting it from the Commune of Makebuko. The Kanyangwa River flows through Gishubi to join it from the west (left). The marshes of these two rivers are used for farming year round. The soil in this section of the river is not very fertile, and the farmers must use fertilizer.Template:Sfn

In December 2015 torrential rains in the Commune of Mutaho, Gitega Province, devastated fields in the marshes of the Ruvubu and Ruvyironza rivers. Crops of beans, corn and sweet potatoes that had already been planted were lost.Template:Sfn In April 2024 extensive flooding in the Ruvyironza River valley destroyed several hectares of crops in the Commune of Nyabihanga, Mwaro Province. The bridge linking the Commune of Nyabihanga to the Commune of Gitega was at risk of collapse.Template:Sfn

Hydroelectricity

The Ruvyironza power station is in Gitega Province, northeast of the city of Gitega, facing Karuzi Province over the Ruvubu River. It is fed by a canal running south from a dam on the Ruvyironza River near its mouth on the Ruvubu River. It discharges into the Ruvubu River.Template:Sfn The Ruvyironza plant, owned by REGIDESO Burundi, was commissioned in 1980/1984.Template:Sfn Power is supplied by three 425 KW turbines, delivering 1275 KW when all three are running, or 850 KW when just two are operational.Template:Sfn

A 2012 report by the Ministry for Energy and Mines stated that potential developments on the Ruvyironza (Luvi 047, 039, 012) might be able to deliver 21.2MW.Template:Sfn

See also

• List of rivers of Burundi

Sources

• Temperature data from satellite measurements of the earth's surface temperature within a box that is 0.1×0.1 degrees
• Average value for the years 2012–2014 within a box that is 0.1×0.1 degrees