Lake Kariba

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Lake Kariba
Lake Kariba.jpg
Coordinates 16°55′S 28°00′E / 16.917°S 28.000°E / -16.917; 28.000Coordinates: 16°55′S 28°00′E / 16.917°S 28.000°E / -16.917; 28.000
Lake type Hydroelectric reservoir
Catchment area 663,000 km²
Basin countries Zimbabwe, Zambia
Max. length 223 km (139 mi)
Max. width 40 km (25 mi)
Surface area 5,580 km²
Average depth 29 m (95 ft)
Max. depth 97 m (318 ft)
Water volume 180 cubic kilometres (43 cu mi)
Surface elevation 485 metres (1,591 ft)
Islands Chete Island
Sekula
Chikanka.

Lake Kariba is the world's largest artificial lake and reservoir by volume. It lies 1300 kilometers upstream from the Indian Ocean, along the border between Zambia and Zimbabwe. Lake Kariba was filled between 1958 and 1963 following the completion of the Kariba Dam at its northeastern end, flooding the Kariba Gorge on the Zambezi River.

The Zimbabwean town of Kariba was built for construction workers on the lake's dam, while some other settlements such as Binga village and Mlibizi in Zimbabwe and Siavonga and Sinazongwe in Zambia have grown up to house people displaced by the rising waters.

Physical characteristics[edit]

Lake Kariba is over 223 kilometers (140 mi) long and up to 40 kilometers (20 mi) in width. It covers an area of 5,580 square kilometers (2,150 sq mi) and its storage capacity is an immense 185 cubic kilometers (44.4 cu mi). The mean depth of the lake is 29 meters (95 ft); the maximum depth is 97 meters (320 ft). It is the world's largest human-made reservoir, four times as large as the Three Gorges Dam.[1] The enormous mass of water (approximately 180,000,000,000,000 kilograms, or 180 petagrams [200 billion tons]) is believed to have caused induced seismicity in the seismically active region, including over 20 earthquakes of greater than 5 magnitude on the Richter scale.[2]

The lake has several islands, including Maaze Island, Mashape Island, Chete Island, Sekula, Sampa Karuma, Fothergill, Spurwing, Snake Island, Antelope Island, Bed Island, and Chikanka.

Ecology[edit]

Before Lake Kariba was filled, the existing vegetation was burned, creating a thick layer of fertile soil on land that would become the lake bed. As a result the ecology of Lake Kariba is vibrant. A number of fish species have been introduced to the lake, notably the sardine-like kapenta (transported from Lake Tanganyika), which now supports a thriving commercial fishery. Other inhabitants of Lake Kariba include Nile crocodiles and hippopotamus.

Gamefish, particularly tigerfish, which was among the indigenous species of the Zambezi river system, now thrive on the kapenta, which in turn encourages tourism. Both Zambia and Zimbabwe are now attempting to develop the tourism industry along their respective coasts of Lake Kariba.

Fish eagles, cormorants and other water birds patrol the shorelines, as do occasional herds of elephants.

Protected areas[edit]

The portion of Lake Kariba which falls within Zimbabwe has been designated a Recreational Park within the Zimbabwe Parks and Wildlife Estate.

Footnotes[edit]

  1. ^ "Kariba". Encyclopædia Britannica. Retrieved 2007-07-31. 
  2. ^ "Evidence for Incipient Rifting in Southern Africa". Geophysical Journal International. Retrieved 2007-07-31. 

See also[edit]

References[edit]

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