Swakop River

Last updated
Swakop
Swakop Valley.jpg
The landscape of the Swakop River Valley near Richthofen
Native nameTsoaxaub (Khoekhoe)
Location
Country Namibia
Regions Khomas, Otjozondjupa, Erongo
Physical characteristics
Source Eros Mountains near Otjozondjati
  elevation1,560 m (5,120 ft)
Mouth  
  location
Atlantic Ocean
  coordinates
22°40′S14°32′E / 22.667°S 14.533°E / -22.667; 14.533
  elevation
0 m (0 ft)
Length460 km (290 mi)
Basin size30,100 km2 (11,600 sq mi)
Basin features
Tributaries 
  left Otjiseva River, Kaan River, Tsaobis River
  right Sney River, Omusema River, Gami Kaub River, Khan River
Waterbodies Von Bach Dam, Swakoppoort Dam
The Swakop River flooding 20 km outside Swakopmund on 15 February 2008. Swakop 20 km before Swakopmund.jpg
The Swakop River flooding 20 km outside Swakopmund on 15 February 2008.
Where the Swakop meets the Atlantic Ocean (2017). Poles of the old railway bridge seen in the foreground. Muendung des Swakop.jpg
Where the Swakop meets the Atlantic Ocean (2017). Poles of the old railway bridge seen in the foreground.
Aerial view of Swakop River (2017). Swakop Vogelperspektive.jpg
Aerial view of Swakop River (2017).

The Swakop River (Khoekhoe : Tsoaxaub) [1] is a major river in western central Namibia. Its source is in the Khomas Highland. From there it flows westwards through the town of Okahandja, the historic mission station at Gross Barmen, and the settlement of Otjimbingwe. It then crosses the Namib desert and reaches the Atlantic Ocean at Swakopmund (German : Mouth of the Swakop). The Swakop is an ephemeral river; its run-off is roughly 40 million cubic metres per annum. [2]

Contents

The Swakop River, along with its main tributary Khan, is one of the largest temporary water-bearing rivers in the dry western part of Namibia. It is 460 km (290 mi) long and has a 30,100 km2 (11,600 sq mi) large catchment area (including its tributaries). [3] The name comes from the Khoekhoe phrase Tsoa-xaub, from tsoa 'anus‘ and xaub 'excrement'. The name derives from the observation of the flow of large amounts of brownish sludge that discharge into the Atlantic Ocean with the rains. [4]

The area around the river mouth and the surrounding dunes are also known for rich bird life and some unusual plant species (like the Welwitschia) that use the regular fog drifting in from the sea to sustain themselves in the absence of other moisture.

Groundwater levels in the area have dropped about 0.3 m further due to the presence of two big dams built on the Swakop River. [5]

Notwithstanding the river’s irregular flow, some agriculture is undertaken in the Swakop River valley. Thus, the region is well known for its fresh produce, especially tomatoes, asparagus and olives. There are some fears of salt and uranium (possibly natural, possibly from the Rössing uranium mine) endangering this farming industry. [5] [6]

Hydrology

The Swakop drains a catchment area of 30,100 km2 extending from the mouth into the Atlantic Ocean at Swakopmund over Otjimbingwe and in the east to about 50 km from Okahandja, and in the south to Khomas Highlands outside Windhoek. The highest point of the watershed is located at 2,480 m. Annual rainfall varies from 0 mm in the lower reaches up to 475 mm in the eastern Khomas Highlands. Rainfall exceeds 300 mm per year in 39% of the catchment area, and up to 80% of the catchment experiences annual rainfall above 100 mm. [3] [7]

The Von Bach Dam near Okahandja and Swakoppoort Dam west of Gross Barmen in the upper reaches of the Swakop are of great importance for the water supply of Central Namibia. Like all rivers, the Swakop also has a number of major sources and major wetlands in the lower reaches. Existing groundwater, however, is often salty due to soil salinity.

On the lower reaches of the river, flooding has become ever more increasing, due to increased land use of the Swakop gallery forests. This contributes to a stronger and more rapid runoff and increased erosion of the Swakop Marshlands.

Vegetation and fauna

Because of its size and scope, the Swakop has a very diverse catchment area. 29% of the area is in highveld savanna, 28% in thornveld savanna, 34% in semidesert and savanna transition zone, and 9% in the central Namib Desert. [3] In the Highlands a more or less dense bush vegetation prevails. In the arid lower reaches there is a more limited flora in the Swakop River valley itself, with the typical gallery vegetation from ana trees ( Faidherbia albida ), tamarisk ( Tamarix ), camel thorn ( Acacia erioloba ), Salvadora, various fig species, Euclea and also tobacco ( Nicotiana spp.), Jimsonweed ( Datura ) and mesquite ( Prosopis spp.) as invasive species. [8]

Wildlife in the Swakop River valley is found practically only in the sparsely populated lower reaches and is limited to antelope, smaller predators and birds. Animals such as elephants, rhinos, lions and other big cats are no longer to be found.

Usage and colonisation

The farm of Goanikontes in Swakop River, circa 1906. Bundesarchiv Bild 105-DSWA0116, Deutsch-Sud-Westafrika, Farm Gonikontes.jpg
The farm of Goanikontes in Swakop River, circa 1906.

Unlike the rest of the dry rivers in western Namibia, there are large human settlements in the basin of the Swakop River, such as the towns of Usakos, Karibib, Otjimbingwe, Okahandja and Namibia's capital, Windhoek, so that the population in the catchment area is more than 200,000 persons. [3]

While in the upper reaches of the river the farms are often far from the river and extensive grazing is operated, the dams and the high groundwater level along the entire Swakop River valley make intensive farming and even gardening, such as the cultivation of asparagus in Swakopmund Goanikontes, possible.

The extensive use of the groundwater in agriculture and the high water consumption in cities result in the lowering of the water table. This leads, particularly in the lower reaches, to the drying up of many springs as well as to the death of the gallery vegetation. Due to agricultural practices, erosion has greatly increased, so that more and more valuable soil is lost and the intensity of the Swakop floods increases. [3]

Uranium mines such as the Langer Heinrich mine, in the lower reaches of the Swakop, and the Rössing Mine at Khan use enormous quantities of water that further lower the water table. In addition, it is also often claimed that radioactive dust across the Khan gets into the Swakop, and therefore the vegetables cultivated there are contaminated by radioactive materials.

The Swakop Bridge in Swakopmund is a notable man-made sight near the place where the river empties into the ocean.

Related Research Articles

<span class="mw-page-title-main">Geography of Namibia</span>

At 824,292 km2 (318,261 sq mi), Namibia is the world's thirty-fourth largest country. After Mongolia, Namibia is the second least densely populated country in the world. Namibia got its name from the Namib desert that stretches along the coast of the Atlantic. It is also known for its wildlife.

<span class="mw-page-title-main">Namib</span> Desert in Southern Africa

The Namib is a coastal desert in Southern Africa. According to the broadest definition, the Namib stretches for more than 2,000 kilometres (1,200 mi) along the Atlantic coasts of Angola, Namibia, and northwest South Africa, extending southward from the Carunjamba River in Angola, through Namibia and to the Olifants River in Western Cape, South Africa. The Namib's northernmost portion, which extends 450 kilometres (280 mi) from the Angola-Namibia border, is known as Moçâmedes Desert, while its southern portion approaches the neighboring Kalahari Desert. From the Atlantic coast eastward, the Namib gradually ascends in elevation, reaching up to 200 kilometres (120 mi) inland to the foot of the Great Escarpment. Annual precipitation ranges from 2 millimetres (0.079 in) in the aridest regions to 200 millimetres (7.9 in) at the escarpment, making the Namib the only true desert in southern Africa. Having endured arid or semi-arid conditions for roughly 55–80 million years, the Namib may be the oldest desert in the world and contains some of the world's driest regions, with only western South America's Atacama Desert to challenge it for age and aridity benchmarks.

<span class="mw-page-title-main">Kuiseb River</span> River in Erongo, Namibia

The Kuiseb River is an ephemeral river in western-central Namibia. Its source is in the Khomas Highland west of Windhoek. From there it flows westwards through the Namib-Naukluft National Park and the Namib desert to Walvis Bay. Several settlements of the Topnaar people are on the banks of the lower Kuiseb, for instance Homeb, Sandfontein, Rooibank, and Utuseb. Inflows of the Kuiseb are Gomab, Ojab, Chausib, Gaub, Koam, Nausgomab and Goagos.

<span class="mw-page-title-main">Regions of Namibia</span>

Namibia uses regions as its first-level subnational administrative divisions. Since 2013, it has 14 regions which in turn are subdivided into 121 constituencies.

<span class="mw-page-title-main">Swakopmund</span> City in Erongo, Namibia

Swakopmund, is a city on the coast of western Namibia, 352 km (219 mi) west of the Namibian capital Windhoek via the B2 main road. It is the capital of the Erongo administrative district. As of 2011, the town had 44,725 inhabitants and 196 km2 (76 sq mi) of land. In 2023, the population had increased to 75,921 people.

<span class="mw-page-title-main">Karibib</span> Town in Erongo Region, Namibia

Karibib is a town in the Erongo Region of western Namibia. It has 3,800 inhabitants and owns 97 square kilometres (37 sq mi) of town land. Karibib is the district capital of the Karibib electoral constituency. It is situated on the Khan River, halfway between Windhoek and Swakopmund on the B2, the main road between Walvis Bay and Johannesburg. The town is known for its aragonite marble quarries and the Navachab Gold Mine.

<span class="mw-page-title-main">Damara people</span> Namibian ethnic group

The Damara, plural Damaran are an ethnic group who make up 8.5% of Namibia's population. They speak the Khoekhoe language and the majority live in the northwestern regions of Namibia, however they are also found widely across the rest of the country.

<span class="mw-page-title-main">Rössing uranium mine</span> Open-pit uranium mine in Namibia

The Rössing uranium mine in Namibia is the longest-running and one of the largest open pit uranium mines in the world. It is located in the Namib Desert near the town of Arandis, 70 kilometres from the coastal town of Swakopmund. Discovered in 1928, the Rössing mine started operations in 1976. In 2005, it produced 3,711 tonnes of uranium oxide, becoming the fifth-largest uranium mine with 8 per cent of global output. Namibia is the world's fourth-largest exporter of uranium.

<span class="mw-page-title-main">Otjimbingwe</span> Settlement in Erongo Region, Namibia

Otjimbingwe is a settlement in the Erongo Region of central Namibia. Otjimbingwe has approximately 8,000 inhabitants and belongs to the Karibib electoral constituency.

Articles related to Namibia include:

<span class="mw-page-title-main">Khan River</span> River

The river Khan is an ephemeral river crossing the Erongo region of central Namibia. It is the main tributary of the Swakop River and only occasionally carries surface water during the rainy season from November to February/March. Khan's catchment area including its tributaries Slang and Etiro stretches over 8,400 square kilometres (3,200 sq mi).

Hermann Heinrich Vedder was a German missionary, linguist, ethnologist and historian. Originally a silk weaver, he received missionary training by the Rhenish Missionary Society in Barmen between 1894 and 1903, whereafter he was sent to German South West Africa in 1905 and worked as a missionary and teacher trainer until his retirement, first for the black workers and prisoners-of-war in Swakopmund, then at the small mission station Gaub in the Otavi Mountains, and from 1922 onwards in Okahandja, where he taught at the Augustineum school.

Gross Barmen is a historic settlement and a recreational spa on the Swakop River in central Namibia, north of Windhoek. It is situated on the District Road 1972, 25 km south-west of Okahandja in the Otjozondjupa Region. Its close proximity to the capital Windhoek makes it a popular weekend destination for locals.

<span class="mw-page-title-main">Water supply and sanitation in Namibia</span>

Namibia is an arid country that is regularly afflicted by droughts. Large rivers flow only along its northern and southern borders, but they are far from the population centers. They are also far from the country's mines, which are large water users. In order to confront this challenge, the country has built dams to capture the flow from ephemeral rivers, constructed pipelines to transport water over large distances, pioneered potable water reuse in its capital Windhoek located in the central part of Namibia, and built Sub-Saharan Africa's first large seawater desalination plant to supply a uranium mine and the city of Swakopmund with water. A large scheme to bring water from the Okavango River in the North to Windhoek, the Eastern National Water Carrier, was only partially completed during the 1980s.

Utuseb is a small settlement in the Erongo Region in western central Namibia. It is situated in the Namib Desert, approximately 40 kilometres (25 mi) from Walvis Bay on the banks of Kuiseb River. Utuseb has approximately 700 inhabitants and belongs to the Walvis Bay Rural electoral constituency. The people living here belong to the ǂAonin community, a subtribe of the Nama people.

<span class="mw-page-title-main">Hoanib</span> Ephemeral seasonal river in Namibia

The Hoanib is one of the 12 ephemeral seasonal rivers in the west of Namibia, where it used to be the border between northern Damaraland and Kaokoland. Its length is 270 km. With the low population density in the area, the oasis character of the river valley and the relatively high wildlife population of the Hoanib, like in the case of the Hoarusib, its valley is one of the last true wilderness areas in Namibia. One of the last settlements of desert elephants, it is characterised by strong wind and water eroded, weathered stone deposits. Inflows of Hoanib are Aap River, Otjitaimo River, Ombonde, Ganamub, Mudorib and Tsuxub.

<span class="mw-page-title-main">Husab Mine</span>

The Husab Mine, operated under the Husab Uranium Project, is a uranium mine near the town of Swakopmund in the Erongo region of western-central Namibia. The mine is located approximately 5 kilometres (3.1 mi) south of the larger Rössing uranium mine and 45 kilometres (28 mi) from Walvis Bay. Swakop Uranium believes the Husab Mine has the potential to become the second largest uranium mine in the world after the McArthur River uranium mine in northern Saskatchewan, Canada and the largest open-pit mine on the African continent. Mine construction started in February 2013. The Husab Mine started production towards the end of 2016 after completion of the sulfuric acid leaching plant.

The Topnaar people (ǂAonin) are a clan of the Nama people in Namibia. Their settlements are all situated on the Kuiseb River in the Erongo Region of central Namibia, the largest one is Utuseb.

The Erongo Desalination Plant, also known as the Orano Desalination Plant, is a sea water desalination plant in Namibia. The facility was constructed between 2008 and 2010 by Orano Mining Namibia, which at the time was known as Areva Resources Namibia. The desalination plant was established to supply water to Orano’s Trekkopje Uranium Mine. At the time this plant was commissioned, it was the largest reverse osmosis desalination plant in Southern Africa.

References

Notes

  1. Malan, Johan S (1998). Die Völker Namibias[The Tribes of Namibia] (in German). Windhoek, Göttingen: Klaus Hess. pp. 134–135.
  2. "Elections 2010: Erongo regional profile". New Era. 24 June 2005.
  3. 1 2 3 4 5 Jacobson, Peter J.; Jacobson, Kathryn M.; Seely, Mary K. (1995). Ephemeral rivers and their catchments: Sustaining people and development in western Namibia (PDF 8.7MB). Windhoek: Desert Research Foundation of Namibia. pp. 138–139. ISBN   9991670947.
  4. Raper, Peter (1987) Dictionary of Southern African Place Names. Johannesburg: Lowry Publishers.
  5. 1 2 Uranium in groundwater 'not serious': Roessing - The Namibian, Friday 24 June 2005
  6. "Rössing in the Erongo Region". Rössing Uranium Limited. Archived from the original on 2006-12-30. Retrieved 2007-01-06.
  7. Clifford, T. N. (2008-03-01). "The geology of the Neoproterozoic Swakop-Otavi transition zone in the Outjo District, northern Damara Orogen, Namibia". South African Journal of Geology. 111 (1): 117–140. doi:10.2113/gssajg.111.1.117. ISSN   1012-0750.
  8. Cowlishaw, Guy; Davies, Jonathan G. (June 1997). "Flora of the Pro-Namib Desert Swakop River Catchment, Namibia: community classification and implications for desert vegetation sampling". Journal of Arid Environments. 36 (2): 271–290. doi:10.1006/jare.1996.0203. ISSN   0140-1963.

Literature