|
Mantasoa Dam
Mantasoa Dam is a buttress dam on the Varahina-North River, a tributary of the Ikopa River, near Mantasoa in the Analamanga Region of Madagascar. The dam was constructed by French contractors between 1937 and 1938. It creates Lake Mantasoa which has a surface area of . The dam itself is made of of concrete and has a reinforced buttress design. Water released from the dam supplies a regulated flow to hydroelectric power station at the Antelomita Dams downstream. A saddle dam on the north side of the Mantosoa reservoir regulates water flow into the Mandraka River for the Mandraka Dam Mandraka Dam is a gravity dam on the Mandraka River near Mandraka in the Analamanga Region of Madagascar. The dam was constructed by a French firm by 1956 and creates Lake Mandraka. Mandraka Power Station The dam supplies water to a hydroelect ... downstream. See also * Tsiazompaniry Dam – on the Varahina South River References {{reflist Dams in Madagascar Analamanga Buttress dams Dam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mantasoa
Mantasoa is a municipality in Madagascar. It belongs to the district of Manjakandriana, which is a part of Analamanga Region. The population of the municipality was 10,604 in 2018. Mantasoa is located at 68 km East of Antananarivo. 60 villages in 11 Fokontany (localities) belong to this municipality. Education There are 20 schools in Mantasoa: 14 primary schools and 6 secondary schools. Economy The majority 95.5% of the population of the commune are farmers, while an additional 0.5% receives their livelihood from raising livestock. The most important crop is rice, while other important products are beans, cassava and sweet potatoes. Services provide employment for 3% of the population. Additionally fishing employs 1% of the population. 20,05 km2 (18,9%) of the surface of this municipality is occupied by the Lake Mantasoa. 9 km2 is agriculture land, 3,1 km2 by rice and 5,71 km2 of other plantations (Tanety). West of the lake is private land with Eucalyptus and Pinus plantatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analamanga Region
Analamanga is a region in central Madagascar, containing the capital Antananarivo and its surrounding metropolitan area. The region has an area of , and had a population of 3,618,128 in 2018. Administrative divisions Analamanga Region is divided into eight districts, which are sub-divided into 137 communes. * Ambohidratrimo District - 24 communes * Andramasina District - 14 communes * Anjozorobe District - 18 communes * Ankazobe District - 15 communes * Antananarivo-Atsimondrano District - 26 communes * Antananarivo-Avaradrano District - 16 communes * Antananarivo-Renivohitra District - 1 commune; the city of Antananarivo * Manjakandriana District - 23 communes Geography The region extends mainly towards the north of the capital. It is bordered by Betsiboka to the north, Bongolava and Itasy to the west, Alaotra Mangoro to the east, and Vakinankaratra to the south. Rivers The main rivers are the Betsiboka River and the Ikopa River. Major lakes Lake Mantasoa (1375 ha) and T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jirama
Jirama ( ''Jiro sy rano malagasy'') is a state-owned electric utility and water services company in Madagascar. History The Jirama was established on 17 October 1975 when the Société Malagasy des Eaux et Electricité and the Société des Energies de Madagascar merged. Up until 1999, it was the only state-owned electricity company of the country. After 1999, the Jirama maintained its monopoly on transportation and distribution networks. In 2007, when Antananrivo's Mayor Andry Rajoelina took office, the city's treasury had a debt of 8.2 billion Malagasy Ariary (approximately 4.6 million U.S. dollars). On 4 January 2008, because of unpaid debts to the Jirama, the city of Antananarivo was hit by a general water cutoff and brownouts of the city's street lights. After an audit, it was found that the Jirama owed about the same amount of money to the city, and the sanction on the city's population was relieved. In 2008, thanks to the launch of a new thermal power plant in Mandrosez ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buttress Dam
A buttress dam or hollow dam is a dam with a solid, water-tight upstream side that is supported at intervals on the downstream side by a series of buttresses or supports. The dam wall may be straight or curved. Most buttress dams are made of reinforced concrete and are heavy, pushing the dam into the ground. Water pushes against the dam, but the buttresses are inflexible and prevent the dam from falling over. Buttress or hollow gravity dams were originally built to retain water for irrigation or mining in areas of scarce or expensive resources but cheap labour. A buttress dam is a good choice in wide valleys where solid rock is rare. As designs have become more sophisticated, the virtues and weaknesses of buttress dams have become apparent. The Romans were the first to use buttresses to increase the stability of a dam wall. Buttress dams of slab concrete construction became popular in the United States in the early 20th Century with the patented process of Norwegian-American civil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ikopa River
The Ikopa River is the second longest waterway in Madagascar and passes through the capital, Antananarivo. It is the largest tributary of the Betsiboka River. It is formed by the Varahina-North and Varahina-South Rivers. Its spring, named Varahina, is found in the sub-prefecture of Andramasina ''For other localities in Madagascar with the same name, please check: '' Andramasina (other) Andramasina is a town in Analamanga Region, in the Central Highlands of Madagascar Madagascar (; mg, Madagasikara, ), officially th ... at an altitude of 1810 meters. References Rivers of Madagascar Rivers of Analamanga {{Madagascar-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madagascar
Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Africa across the Mozambique Channel. At Madagascar is the world's List of island countries, second-largest island country, after Indonesia. The nation is home to around 30 million inhabitants and consists of the island of Geography of Madagascar, Madagascar (the List of islands by area, fourth-largest island in the world), along with numerous smaller peripheral islands. Following the prehistoric breakup of the supercontinent Gondwana, Madagascar split from the Indian subcontinent around 90 million years ago, allowing native plants and animals to evolve in relative isolation. Consequently, Madagascar is a biodiversity hotspot; over 90% of wildlife of Madagascar, its wildlife is endemic. Human settlement of Madagascar occurred during or befo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Mantasoa
Lake Mantasoa is a large lake with a surface area of , created by the Mantasoa Dam on the Varahina river (an affluent of the Ikopa river) in the municipality of Mantasoa, Analamanga region of Madagascar. It provides tabbed water for the capitol Antananarivo. Geography It is situated at 68km east of Antananarivo Antananarivo (French language, French: ''Tananarive'', ), also known by its colonial shorthand form Tana, is the Capital city, capital and largest city of Madagascar. The administrative area of the city, known as Antananarivo-Renivohitra ("An .... References Mantasoa Analamanga {{Madagascar-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buttress
A buttress is an architectural structure built against or projecting from a wall which serves to support or reinforce the wall. Buttresses are fairly common on more ancient buildings, as a means of providing support to act against the lateral (sideways) forces arising out of inadequately braced roof structures. The term ''counterfort'' can be synonymous with buttress and is often used when referring to dams, retaining walls and other structures holding back earth. Early examples of buttresses are found on the Eanna Temple (ancient Uruk), dating to as early as the 4th millennium BC. Terminology In addition to flying and ordinary buttresses, brick and masonry buttresses that support wall corners can be classified according to their ground plan. A clasping or clamped buttress has an L shaped ground plan surrounding the corner, an angled buttress has two buttresses meeting at the corner, a setback buttress is similar to an angled buttress but the buttresses are set back from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydroelectric
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and also more than nuclear power. Hydropower can provide large amounts of low-carbon electricity on demand, making it a key element for creating secure and clean electricity supply systems. A hydroelectric power station that has a dam and reservoir is a flexible source, since the amount of electricity produced can be increased or decreased in seconds or minutes in response to varying electricity demand. Once a hydroelectric complex is constructed, it produces no direct waste, and almost always emits considerably less greenhouse gas than fossil fuel-powered energy plants. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antelomita Dam
The Antelomita Hydroelectric Power Station is located in the rural commune Anjeva Gara of the Analamanga Region, Madagascar. The hydroelectric power station comprises two parts, Antelomita I and II. Both are adjacent to one another on separate water falls along the Ikopa River. Each water fall is dammed and water is diverted to the power station; each of which contains three generators. The first two were commissioned in 1930, the second two in 1952 and the final two in 1953. Both stages have an installed capacity of . They were built by a French firm but are now owned and operated by Jirama. The Tsiazompaniry and Mantasoa Dams upstream regulate water to the power station. It is situated in a distance of 48 km South-East from Antananarivo, 10 km East of Anjeva Gara Anjeva Gara is a rural commune in Analamanga Region, in the Central Highlands of Madagascar. It belongs to the district of Antananarivo Avaradrano and its populations numbers to 8,278 in 2018. Economy 10km east of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mandraka Dam
Mandraka Dam is a gravity dam on the Mandraka River near Mandraka in the Analamanga Region of Madagascar. The dam was constructed by a French firm by 1956 and creates Lake Mandraka. Mandraka Power Station The dam supplies water to a hydroelectric power station to the east, down in the valley. The change in elevation between the dam and power station affords a hydraulic head on . The dam and power station are operated and owned by Jirama and the four Pelton turbine-generators were commissioned between 1958 and 1972. See also *Mantasoa Dam Mantasoa Dam is a buttress dam on the Varahina-North River, a tributary of the Ikopa River, near Mantasoa in the Analamanga Region of Madagascar. The dam was constructed by French contractors between 1937 and 1938. It creates Lake Mantasoa whic ... – regulates water flow to Mandraka Dam References {{reflist Dams in Madagascar Analamanga Gravity dams Dams completed in 1956 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
