1.
Nile
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The Nile is a major north-flowing river in northeastern Africa. It is generally regarded as the longest river in the world, in particular, the Nile is the primary water source of Egypt and Sudan. The Nile has two tributaries, the White Nile and Blue Nile. The White Nile is considered to be the headwaters and primary stream of the Nile itself, the Blue Nile, however, is the source of most of the water and silt. The White Nile is longer and rises in the Great Lakes region of central Africa and it flows north through Tanzania, Lake Victoria, Uganda and South Sudan. The Blue Nile begins at Lake Tana in Ethiopia and flows into Sudan from the southeast, the two rivers meet just north of the Sudanese capital of Khartoum. The northern section of the river flows north almost entirely through the Sudanese desert to Egypt, then ends in a large delta, Egyptian civilization and Sudanese kingdoms have depended on the river since ancient times. Most of the population and cities of Egypt lie along those parts of the Nile valley north of Aswan, in the ancient Egyptian language, the Nile is called Ḥpī or Iteru, meaning river. In Coptic, the words piaro or phiaro meaning the river come from the ancient name. The English name Nile and the Arabic names en-Nîl and an-Nîl both derive from the Latin Nilus and the Ancient Greek Νεῖλος, beyond that, however, the etymology is disputed. One possible etymology derives it from a Semitic Nahal, meaning river, the standard English names White Nile and Blue Nile, to refer to the rivers source, derive from Arabic names formerly applied only to the Sudanese stretches which meet at Khartoum. Above Khartoum, the Nile is also known as the White Nile, at Khartoum the river is joined by the Blue Nile. The White Nile starts in equatorial East Africa, and the Blue Nile begins in Ethiopia, both branches are on the western flanks of the East African Rift. The drainage basin of the Nile covers 3,254,555 square kilometers, the source of the Nile is sometimes considered to be Lake Victoria, but the lake has feeder rivers of considerable size. It is either the Ruvyironza, which emerges in Bururi Province, Burundi, or the Nyabarongo, the two feeder rivers meet near Rusumo Falls on the Rwanda-Tanzania border. Gish Abay is reportedly the place where the water of the first drops of the Blue Nile develop. The Nile leaves Lake Nyanza at Ripon Falls near Jinja, Uganda and it flows north for some 130 kilometers, to Lake Kyoga. For the remaining part it flows westerly through the Murchison Falls until it reaches the very northern shores of Lake Albert where it forms a significant river delta
2.
Bailey bridge
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The Bailey bridge is a type of portable, pre-fabricated, truss bridge. It was developed by the British during World War II for military use and saw use by British, Canadian. A Bailey bridge had the advantages of requiring no tools or heavy equipment to assemble. The wood and steel bridge elements were small and light enough to be carried in trucks and lifted into place by hand, the bridges were strong enough to carry tanks. Bailey bridges continue to be used in civil engineering construction projects and to provide temporary crossings for foot. Donald Bailey was a servant in the British War Office who tinkered with model bridges as a hobby. He presented one such model to his chiefs, who saw some merit in the design, a team of Royal Engineer officers was assembled at the Military Engineering Experimental Establishment, in Barrack Road Christchurch, Dorset, in 1941 and 1942. In the course of development, the bridge was tested in several formats, e. g. as a suspension bridge, and as a stepped arch bridge, as well as the flat truss bridge which became the standard. The prototype of this was used to span Mother Sillers Channel which cuts through the nearby Stanpit Marshes, an area of marshland at the confluence of the River Avon and it remains there as a functioning bridge. Bridges in the formats were built, temporarily, to cross the Avon. After successful development and testing, the bridge was taken into service by the Corps of Royal Engineers, a number of bridges were available by 1944 for D-Day, when production was accelerated. The US also licensed the design and started construction for their own use. Bailey was later knighted for his invention, which continues to be produced and used today. The original design, however, violated a patent on the Callender-Hamilton bridge, the designer of that bridge, A. M. Hamilton successfully applied to the Royal Commission on Awards to Inventors. The Bailey Bridge, however, had advantages over Hamiltons design. For example, damaged parts could not be replaced quickly on the Callender-Hamilton bridge, the Callender-Hamilton bridge was modified by the London County Council engineers department in the design of three emergency bridges which were erected across the River Thames in 1940. Damaged parts of these could be quickly replaced, experience gained in this work contributed to the development of the Bailey Bridge. Lieutenant General Sir Giffard Le Quesne Martel was awarded £500 for infringement on the design of his box girder bridge, most, if not all, previous designs for military bridges required cranes to lift the pre-assembled bridge and lower it into place
3.
Juba
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Juba /ˈdʒuːbə/ is the capital and largest city of the Republic of South Sudan. It also serves as the capital of Jubek State, one of the 28 states of South Sudan, the city is situated on the White Nile and functions as the seat and metropolis of Juba County. In the 19th century, a trading post and a mission and it was the southernmost outpost of the Egyptian garrison, supported by a handful of soldiers, mostly ill due to the malaria and blackwater fever that was dominant in the region. In the late 1920s, Anglo-Egyptian officials ordered Bari residents to relocate to make way for a new town, also called Juba, the site was chosen by Anglo-Egyptian officials, in part, because of the presence of the CMS Nugent Memorial Intermediate School there. Major construction on Juba was underway by 1927, traders from Rejaf relocated there in 1929, and the Governors office of Mongalla moved there in 1930. Greek merchants, who were supplying the British Army at the time, played an early. The building of Central Bank was also built at a stage in the mid 40s as well as the famous Juba Hotel in the mid 30s. Until 1956, Juba was in the Anglo-Egyptian Sudan, which was administered by the United Kingdom. British hopes to join the part of Sudan with Uganda were dashed in 1947 by an agreement in Juba, also known as the Juba Conference. In 1955, a mutiny of soldiers in Torit town sparked the First Sudanese Civil War. During the Second Sudanese Civil War, Juba was a location that was the focus of much fighting. With the advent of peace, the United Nations increased its presence in Juba, Juba became the worlds newest national capital on 9 July 2011, when South Sudan formally declared its independence from the Republic of the Sudan. As of 2016, the move has yet to occur, Juba is led by a city council headed by Mayor Mohammed El Haj Baballa. This council was formed in March 2011 and Baballa appointed to lead it by Governor Clement Wani Konga, former Yei County Commissioner David Lokonga Moses was appointed as deputy mayor. A ministerial committee to keep Juba clean and sanitary was also created by gubernatorial decree at the same time, prior to March 2011, the area now administered by Juba City Council was divided into Juba, Kator, and Muniki payams. It is now a subdivision of Juba County, of which it is the county seat. The city is a port and the southern terminus of traffic along the Nile. Before the civil war, Juba was also a hub, with highways connecting it to Kenya, Uganda
4.
Sudan
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Sudan, also known as North Sudan since South Sudans independence and officially the Republic of the Sudan, is a country in Northern Africa. It is the third largest country in Africa, the River Nile divides the country into eastern and western halves. Before the Sudanese Civil War, South Sudan was part of Sudan, Sudan was home to numerous ancient civilizations, such as the Kingdom of Kush, Kerma, Nobatia, Alodia, Makuria, Meroë and others, most of which flourished along the Nile. During the pre-dynastic period Nubia and Nagadan Upper Egypt were identical, by virtue of its proximity to Egypt, the Sudan participated in the wider history of the Near East inasmuch as it was Christianized by the 6th century, and Islamized in the 15th. As a result of Christianization, the Old Nubian language stands as the oldest recorded Nilo-Saharan language, Sudan was the largest country in Africa and the Arab world until 2011, when South Sudan separated into an independent country, following an independence referendum. Sudan is now the third largest country in Africa and also the third largest country in the Arab world and its capital is Khartoum, the political, cultural and commercial centre of the nation. It is a representative democratic federal republic. The politics of Sudan are regulated by an organization called the National Assembly. The Sudanese legal system is based on Islamic law, the countrys place name Sudan is a name given to a geographical region to the south of the Sahara, stretching from Western Africa to eastern Central Africa. The name derives from the Arabic bilād as-sūdān, or the lands of the Blacks, during the fifth millennium BC migrations from the drying Sahara brought neolithic people into the Nile Valley along with agriculture. The population that resulted from this cultural and genetic mixing developed social hierarchy over the centuries become the Kingdom of Kush at 1700 BC. The Kingdom of Kush was an ancient Nubian state centered on the confluences of the Blue Nile and White Nile, and the Atbarah River and it was established after the Bronze Age collapse and the disintegration of the New Kingdom of Egypt, centered at Napata in its early phase. After King Kashta invaded Egypt in the eighth century BC, the Kushite kings ruled as pharaohs of the Twenty-fifth Dynasty of Egypt for a century before being defeated and driven out by the Assyrians. At the height of their glory, the Kushites conquered an empire that stretched from what is now known as South Kordofan all the way to the Sinai, pharaoh Piye attempted to expand the empire into the Near East, but was thwarted by the Assyrian king Sargon II. Sennacheribs successor Esarhaddon went further, and invaded Egypt itself, deposing Taharqa, Taharqa fled back to his homeland where he died two years later. Egypt became an Assyrian colony, however, king Tantamani, after succeeding Taharqa, Esarhaddon died while preparing to leave the Assyrian capital of Nineveh in order to eject him. However, his successor Ashurbanipal sent an army into southern Egypt and routed Tantamani. During Classical Antiquity, the Nubian capital was at Meroë, in ancient Greek geography, the Meroitic kingdom was known as Ethiopia
5.
South Sudan
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South Sudan, officially the Republic of South Sudan, is a landlocked country in northeastern Africa that gained its independence from Sudan in 2011. Its current capital is Juba, which is also its largest city and it was planned that the capital city would be changed to the more centrally located Ramciel in the future before civil war broke out. It includes the vast swamp region of the Sudd, formed by the White Nile, following the First Sudanese Civil War, the Southern Sudan Autonomous Region was formed in 1972 and lasted until 1983. A second Sudanese civil war soon developed and ended with the Comprehensive Peace Agreement of 2005, later that year, southern autonomy was restored when an Autonomous Government of Southern Sudan was formed. South Sudan became an independent state on 9 July 2011, following a referendum passed with 98. 83% of the vote. It is a United Nations member state, a state of the African Union, of the East African Community. In July 2012, South Sudan signed the Geneva Conventions, South Sudan has suffered ethnic violence and has been in a civil war since 2013, as of 2016 it has the second highest score on the Fragile States Index. The Nilotic people of South Sudan—the Acholi, Anyuak, Bari, Dinka, Nuer, Shilluk, Kaligi, Zande, the Azande, Mundu, Avukaya and Baka, who entered South Sudan in the 16th century—established the regions largest state of Equatoria Region. The Dinka are the largest, Nuer the second largest and Azande are the third-largest ethnic group in South Sudan while the Bari are fourth-largest. They are found in the Maridi, Yambio, and Tombura districts in the tropical rainforest belt of Western Equatoria, in the 18th century, the Avungara sib rose to power over the rest of Azande society and this domination continued into the 20th century. The major reasons include the history of British policy preference toward developing the Arab north. After Sudans first independent elections in 1958, the ignoring of the south by Khartoum led to uprisings, revolt. As of 2012, peoples include Acholi, Anyuak, Azande, Baka, Balanda Bviri, Bari, Boya, Didinga, Dinka, Jiye, Kaligi, Kuku, Lotuka, Mundari, Murie, Nilotic, Nuer, Shilluk, Toposa and Zande. Slavery had been an institution of Sudanese life throughout history, the slave trade in the south intensified in the 19th century and continued after the British had suppressed slavery in much of sub-Saharan Africa. Annual Sudanese slave raids into non-Muslim territories resulted in the capture of thousands of southern Sudanese. In the 19th century, the Azande fought the French, the Belgians, Egypt, under the rule of Khedive Ismail Pasha, first attempted to control the region in the 1870s, establishing the province of Equatoria in the southern portion. Egypts first governor was Samuel Baker, commissioned in 1869, followed by Charles George Gordon in 1874, the Mahdist Revolt of the 1880s destabilized the nascent province, and Equatoria ceased to exist as an Egyptian outpost in 1889. Important settlements in Equatoria included Lado, Gondokoro, Dufile and Wadelai, european colonial maneuverings in the region came to a head in 1898, when the Fashoda Incident occurred at present-day Kodok, Britain and France almost went to war over the region
6.
Rwanda
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Rwanda, officially the Republic of Rwanda, is a sovereign state in central and east Africa and one of the smallest countries on the African mainland. Located a few south of the Equator, Rwanda is bordered by Uganda, Tanzania, Burundi. Rwanda is in the African Great Lakes region and is elevated, its geography is dominated by mountains in the west and savanna to the east. The climate is temperate to subtropical, with two seasons and two dry seasons each year. The population is young and predominantly rural, with a density among the highest in Africa, Rwandans are drawn from just one cultural and linguistic group, the Banyarwanda, although within this group there are three subgroups, the Hutu, Tutsi and Twa. The Twa are a pygmy people descended from Rwandas earliest inhabitants. Christianity is the largest religion in the country, the language is Kinyarwanda, spoken by most Rwandans, with English. Rwanda has a system of government. The president is Paul Kagame of the Rwandan Patriotic Front, who took office in 2000, Rwanda today has low corruption compared with neighbouring countries, although human rights organisations report suppression of opposition groups, intimidation and restrictions on freedom of speech. The country has been governed by an administrative hierarchy since pre-colonial times. Rwanda is one of two countries with a female majority in the national parliament. Hunter gatherers settled the territory in the stone and iron ages, the population coalesced first into clans and then into kingdoms. The Kingdom of Rwanda dominated from the century, with the Tutsi kings conquering others militarily, centralising power. Germany colonised Rwanda in 1884 as part of German East Africa, followed by Belgium, both European nations ruled through the kings and perpetuated a pro-Tutsi policy. The Hutu population revolted in 1959 and they massacred numerous Tutsi and ultimately established an independent, Hutu-dominated state in 1962. The Tutsi-led Rwandan Patriotic Front launched a war in 1990. Social tensions erupted in the 1994 genocide, in which Hutu extremists killed an estimated 500,000 to 1.3 million Tutsi, the RPF ended the genocide with a military victory. Rwandas economy suffered heavily during the 1994 Rwandan Genocide, but has since strengthened, the economy is based mostly on subsistence agriculture
7.
Tanzania
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Tanzania /ˌtænzəˈniːə/, officially the United Republic of Tanzania, is a country in Eastern Africa within the African Great Lakes region. Parts of the country are in Southern Africa, Mount Kilimanjaro, Africas highest mountain, is in northeastern Tanzania. Tanzanias population of 51.82 million is diverse, composed of ethnic, linguistic. Dar es Salaam, the capital, retains most government offices and is the countrys largest city, principal port. Tanzania is a one party dominant state with the Chama Cha Mapinduzi party in power, from its formation until 1992, it was the only legally permitted party in the country. Elections for president and all National Assembly seats were last held in October 2015, the CCM holds approximately 75% of the seats in the assembly. Prehistoric population migrations include Southern Cushitic speakers, who are ancestral to the Iraqw, Gorowa, and Burunge and who moved south from Ethiopia into Tanzania. Based on linguistic evidence, there may also have two movements into Tanzania of Eastern Cushitic people at about 4,000 and 2,000 years ago. These movements took place at about the time as the settlement of the iron-making Mashariki Bantu from West Africa in the Lake Victoria. They brought with them the west African planting tradition and the staple of yams. They subsequently migrated out of these regions across the rest of Tanzania, European colonialism began in mainland Tanzania during the late 19th century when Germany formed German East Africa, which gave way to British rule following World War I. The mainland was governed as Tanganyika, with the Zanzibar Archipelago remaining a separate colonial jurisdiction, following their respective independence in 1961 and 1963, the two entities merged in April 1964 to form the United Republic of Tanzania. Tanzania is mountainous and densely forested in the northeast, where Mount Kilimanjaro is located, three of Africas Great Lakes are partly within Tanzania. To the north and west lie Lake Victoria, Africas largest lake, and Lake Tanganyika, the eastern shore is hot and humid, with the Zanzibar Archipelago just offshore. The Menai Bay Conservation Area is Zanzibars largest marine protected area, over 100 different languages are spoken in Tanzania, making it the most linguistically diverse country in East Africa. Among the languages spoken in Tanzania are all four of Africas language families, Bantu, Cushitic, Nilotic, Swahili and English are Tanzanias official languages. In connection with his Ujamaa social policies, President Nyerere encouraged the use of Swahili, approximately 10% of Tanzanians speak Swahili as a first language, and up to 90% speak it as a second language. Most Tanzanians thus speak both Swahili and a language, many educated Tanzanians are trilingual, also speaking English
8.
Uganda
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Uganda, officially the Republic of Uganda, is a landlocked country in East Africa. It is bordered to the east by Kenya, to the north by South Sudan, to the west by the Democratic Republic of the Congo, to the south-west by Rwanda, Uganda is the worlds second most populous landlocked country after Ethiopia. The southern part of the country includes a portion of Lake Victoria, shared with Kenya. Uganda is in the African Great Lakes region, Uganda also lies within the Nile basin, and has a varied but generally a modified equatorial climate. Uganda takes its name from the Buganda kingdom, which encompasses a portion of the south of the country. The people of Uganda were hunter-gatherers until 1,700 to 2,300 years ago, beginning in 1894, the area was ruled as a protectorate by the British, who established administrative law across the territory. Uganda gained independence from Britain on 9 October 1962, luganda, a central language, is widely spoken across the country, and several other languages are also spoken including Runyoro, Runyankole, Rukiga, and Luo. The president of Uganda is Yoweri Museveni, who came to power in January 1986 after a protracted guerrilla war. The ancestors of the Ugandans were hunter-gatherers until 1, 700-2,300 years ago, Bantu-speaking populations, who were probably from central Africa, migrated to the southern parts of the country. According to oral tradition, the Empire of Kitara covered an important part of the lakes area, from the northern lakes Albert and Kyoga to the southern lakes Victoria. Bunyoro-Kitara is claimed as the antecedent of the Buganda, Toro, Ankole, some Luo invaded the area of Bunyoro and assimilated with the Bantu there, establishing the Babiito dynasty of the current Omukama of Bunyoro-Kitara. Arab traders moved inland from the Indian Ocean coast of East Africa in the 1830s and they were followed in the 1860s by British explorers searching for the source of the Nile. British Anglican missionaries arrived in the kingdom of Buganda in 1877 and were followed by French Catholic missionaries in 1879, the British government chartered the Imperial British East Africa Company to negotiate trade agreements in the region beginning in 1888. From 1886, there were a series of wars in Buganda. Because of civil unrest and financial burdens, IBEAC claimed that it was unable to maintain their occupation in the region, in the 1890s,32,000 labourers from British India were recruited to East Africa under indentured labour contracts to construct the Uganda Railway. Most of the surviving Indians returned home, but 6,724 decided to remain in East Africa after the lines completion, subsequently, some became traders and took control of cotton ginning and sartorial retail. British naval ships unknowingly carried rats that contained the bubonic plague and these rats spread the disease throughout Uganda. From 1900 to 1920, a sleeping sickness epidemic in the part of Uganda, along the north shores of Lake Victoria
9.
Democratic Republic of the Congo
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The Democratic Republic of the Congo, also known as DR Congo, DRC, DROC, East Congo, Congo-Kinshasa, or simply the Congo is a country located in Central Africa. From 1971 to 1997 it was named, and is still called, Zaire. It is the second-largest country in Africa by area and eleventh largest in the world, the Congolese Civil Wars, which began in 1996, brought about the end of Mobutu Sese Sekos 32-year reign and devastated the country. These wars ultimately involved nine African nations, multiple groups of UN peacekeepers and twenty armed groups, besides the capital, Kinshasa, the other major cities, Lubumbashi and Mbuji-Mayi, are both mining communities. DR Congos largest export is raw minerals, with China accepting over 50% of DRCs exports in 2012, as of 2015, according to the Human Development Index, DR Congo has a low level of human development, ranking 176 out of 187 countries. The country was known officially as the Democratic Republic of the Congo from 1965 to 27 October 1971, in 1992, the Sovereign National Conference voted to change the name of the country to the Democratic Republic of the Congo, but the change was not put into practice. The countrys name was restored by former president Laurent-Désiré Kabila following the fall of longtime dictator Mobutu Sese Seko in 1997, some historians think that Bantu peoples began settling in the extreme northwest of Central Africa at the beginning of the 5th century and then gradually started to expand southward. Their propagation was accelerated by the transition from Stone Age to Iron Age techniques, the people living in the south and southwest were mostly San Bushmen and hunter-gatherer groups, whose technology involved only minimal use of metal technologies. The development of tools during this time period revolutionized agriculture. This led to the displacement of the groups in the east and southeast. The 10th century marked the expansion of the Bantu in West-Central Africa. Rising populations soon made intricate local, regional and foreign commercial networks that traded mostly in salt, iron. Belgian exploration and administration took place from the 1870s until the 1920s and it was first led by Sir Henry Morton Stanley, who undertook his explorations under the sponsorship of King Leopold II of Belgium. The eastern regions of the precolonial Congo were heavily disrupted by constant slave raiding, mainly from Arab–Swahili slave traders such as the infamous Tippu Tip, Leopold had designs on what was to become the Congo as a colony. Leopold formally acquired rights to the Congo territory at the Conference of Berlin in 1885 and he named it the Congo Free State. Leopolds rėgime began various infrastructure projects, such as construction of the railway ran from the coast to the capital of Leopoldville. Nearly all such projects were aimed at making it easier to increase the assets which Leopold. In the Free State, colonists brutalized the local population into producing rubber, for which the spread of automobiles, rubber sales made a fortune for Leopold, who built several buildings in Brussels and Ostend to honor himself and his country
10.
Tributary
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A tributary or affluent is a stream or river that flows into a larger stream or main stem river or a lake. A tributary does not flow directly into a sea or ocean, tributaries and the main stem river drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean. A confluence, where two or more bodies of water together, usually refers to the joining of tributaries. The opposite to a tributary is a distributary, a river or stream that branches off from, distributaries are most often found in river deltas. Right tributary and left tributary are terms stating the orientation of the relative to the flow of the main stem river. These terms are defined from the perspective of looking downstream, where tributaries have the same name as the river into which they feed, they are called forks. These are typically designated by compass direction, for example, the American River receives flow from its North, Middle, and South forks. The Chicago Rivers North Branch has the East, West, and Middle Fork, the South Branch has its South Fork, forks are sometimes designated as right or left. Here, the handedness is from the point of view of an observer facing upstream, for instance, Steer Creek has a left tributary which is called Right Fork Steer Creek. Tributaries are sometimes listed starting with those nearest to the source of the river, the Strahler Stream Order examines the arrangement of tributaries in a hierarchy of first, second, third, and higher orders, with the first-order tributary being typically the least in size. For example, a second-order tributary would be the result of two or more first-order tributaries combining to form the second-order tributary, another method is to list tributaries from mouth to source, in the form of a tree structure, stored as a tree data structure
11.
Blue Nile
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The Blue Nile is a river originating at Lake Tana in Ethiopia. With the White Nile, the river one of the two major tributaries of the Nile. The upper course of the river is called the Abbay in Ethiopia, some Ethiopians have long identified the Blue Nile as the River Gihon mentioned as flowing out of the Garden of Eden, in Genesis 2 and encircling the entire land of Cush. In the local Sudanese language, the word for black is used for the colour blue. The distance of the river from its source to its confluence has been reported as being between 1,460 kilometres and 1,600 kilometres. According to materials published by the Central Statistical Agency, the Blue Nile has a length of 1,450 kilometres. The Blue Nile flows generally south from Lake Tana and then west across Ethiopia, within 30 km of its source at Lake Tana, the river enters a canyon about 400 km long. This gorge is an obstacle for travel and communication from the north half of Ethiopia to the southern half. The power of the Blue Nile may best be appreciated at the Blue Nile Falls and this stream, known as the Lesser Abay River, flows north into Lake Tana. Other affluents of this include, in clockwise order from Gorgora, the Magech River, the Northern Gumara, the Reb River, the southern Gumara River. Lake Tanas outflow then flows some 30 kilometres before plunging over the Blue Nile Falls, the river then loops across northwest Ethiopia through a series of deep valleys and canyons into Sudan, by which point it is only known as the Blue Nile. There are numerous tributaries of the Abay between Lake Tana and the Sudanese border. Those on the side, also in downstream order, include the Handassa, Tul, Abaya, Sade, Tammi, Cha, Shita, Suha, Muga, Gulla, Temcha, Bachat, Katlan, Jiba, Chamoga, Weter. The flow of the Blue Nile reaches maximum volume in the rainy season, the Blue Nile was a major source of the flooding of the Nile that contributed to the fertility of the Nile Valley and the consequent rise of Ancient Egypt and Egyptian mythology. With the completion in 1970 of the Aswan Dam in Egypt, the Blue Nile is vital to the livelihood of Egypt. The Blue Nile, the most significant tributary of the Nile, though shorter than the White Nile, 59% of the water that reaches Egypt originates from the Blue Nile branch of the great river. The river is also an important resource for Sudan, where the Roseires Dam and these dams also help irrigate the Gezira Scheme, which is most famous for its high quality cotton. The region also produces wheat and animal feed crops, in November 2012, Ethiopia began a six-year project for the construction of the Grand Ethiopian Renaissance Dam, a 6000-megawatt hydroelectric dam on the river
12.
Lake Victoria
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Lake Victoria is one of the African Great Lakes. The lake was named after Queen Victoria by the explorer John Hanning Speke, Speke accomplished this in 1858, while on an expedition with Richard Francis Burton to locate the source of the Nile River. In terms of volume, Lake Victoria is the ninth largest continental lake. Lake Victoria receives its water primarily from rainfall and thousands of small streams. The Kagera River is the largest river flowing into this lake, Lake Victoria is drained solely by the Nile River near Jinja, Uganda, on the lakes northern shore. Lake Victoria occupies a depression in Africa. The lake has a depth of 84 metres and an average depth of 40 metres. Its catchment area covers 184,000 square kilometres, geologically, Lake Victoria is relatively young – about 400,000 years old – and it formed when westward-flowing rivers were dammed by an upthrown crustal block. During its geological history, Lake Victoria went through changes ranging from its present shallow depression, geological cores taken from its bottom show Lake Victoria has dried up completely at least three times since it formed. These drying cycles are probably related to past ice ages, which were times when precipitation declined globally, Lake Victoria last dried out about 17,300 years ago, and it refilled 14,700 years ago. Lake Victoria receives 80 percent of its water from direct rainfall, average evaporation on the lake is between 2.0 and 2.2 metres per year, almost double the precipitation of riparian areas. In the Kenya sector, the main influent rivers are the Sio, Nzoia, Yala, Nyando, Sondu Miriu, Mogusi, combined, these rivers contribute far more water to the lake than does the largest single river entering the lake from the west, the Kagera River. The only outflow from Lake Victoria is the Nile River, which exits the lake near Jinja, in terms of contributed water, this makes Lake Victoria the principal source of the longest branch of the Nile. The uppermost section of the Nile is generally known as the Victoria Nile until it reaches Lake Albert, in 1990–1991, oxygen concentrations in the mixed layer were higher than in 1960–1961, with nearly continuous oxygen supersaturation in surface waters. The changes in oxygenation are considered consistent with measurements of higher algal biomass, the extinction of cichlids in the genus Haplochromis has also been blamed on the lakes eutrophication. The fertility of tropical waters depends on the rate at which nutrients can be brought into solution, the influent rivers of Lake Victoria provide few nutrients to the lake in relation to its size. Because of this, most of Lake Victorias nutrients are thought to be locked up in lake-bottom deposits, by itself, this vegetative matter decays slowly. Animal flesh decays considerably faster, however, so the fertility of the lake is dependent on the rate at which nutrients can be taken up by fish
Chisholm, Hugh, ed. (1911). "Nile". Encyclopædia Britannica. 19 (11th ed.). Cambridge University Press.
Chisholm, Hugh, ed. (1911). "
