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Tumarín Dam
The Tumarín Dam is a 60 meter tall, concrete gravity dam under construction on the Río Grande de Matagalpa, just upstream of the town of Tumarín in the South Caribbean Coast Autonomous Region, Nicaragua. It is located about east of San Pedro del Norte, where the Río Grande de Matagalpa meets the Tuma River. Aiming at generating power, it will be the largest hydropower dam in Nicaragua and one of the largest ones in Central America when completed. The power station located at the base of the dam will house three 84.33 MW Kaplan turbine-generators for an installed capacity of 253 MW. The dam will create a reservoir covering 40 square kilometers. The project is being developed by Centrales Hidroelectricas de Nicaragua (CHN). Brazil's Eletrobras was to fund the US$1.1 billion under a 20 to 30 year build–operate–transfer Build–operate–transfer (BOT) or build–own–operate–transfer (BOOT) is a form of project delivery method, usually for large-scale infrastructure pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roller-compacted Concrete
Roller-compacted concrete (RCC) or rolled concrete (rollcrete) is a special blend of concrete that has essentially the same ingredients as conventional concrete but in different ratios, and increasingly with partial substitution of fly ash for portland cement. The partial substitution of fly ash for Portland Cement is an important aspect of RCC dam construction because the heat generated by fly ash hydration is significantly less than the heat generated by portland cement hydration. This in turn reduces the thermal loads on the concrete and reduces the potential for thermal cracking to occur. RCC is a mix of cement/fly ash, water, sand, aggregate and common additives, but contains much less water. The produced mix is drier and essentially has no slump. RCC is placed in a manner similar to road paving; the material is delivered by dump trucks or conveyors, spread by small bulldozers or specially modified asphalt pavers, and then compacted by vibratory rollers. In dam construc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaplan Turbine
The Kaplan turbine is a propeller-type water turbine which has adjustable blades. It was developed in 1913 by Austrian professor Viktor Kaplan, who combined automatically adjusted propeller blades with automatically adjusted wicket gates to achieve efficiency over a wide range of flow and water level. The Kaplan turbine was an evolution of the Francis turbine. Its invention allowed efficient power production in low-head applications which was not possible with Francis turbines. The head ranges from and the output ranges from 5 to 200 MW. Runner diameters are between . Turbines rotate at a constant rate, which varies from facility to facility. That rate ranges from as low as 54.5 rpm ( Albeni Falls Dam) to 450 rpm. Kaplan turbines are now widely used throughout the world in high-flow, low-head power production. Development Viktor Kaplan, living in Brno, Austria-Hungary (now in the Czech Republic), obtained his first patent for an adjustable blade propeller turbine in 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydroelectric Power Stations In Nicaragua
Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, 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] |
Dams In Nicaragua
A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect or store water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions. The word ''dam'' can be traced back to Middle English, and before that, from Middle Dutch, as seen in the names of many old cities, such as Amsterdam and Rotterdam. Ancient dams were built in Mesopotamia and the Middle East for water control. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC. Egyptians also built dams, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2014 Brazilian Economic Crisis
From mid-2014 until late 2016, Brazil experienced a severe economic crisis. The country's Gross Domestic Product (GDP) fell by 3.5% in 2015 and 3.3% in 2016, after which a small economic recovery began. That recovery continued until 2020, when the COVID-19 pandemic began to impact the economy again. The economic crisis occurred alongside a political crisis that resulted in the impeachment of president Dilma Rousseff. These events combined caused mass popular dissatisfaction with the political system. The cause of the crisis was the aforementioned political crisis, as well as the 2014 commodity price shock, which negatively affected Brazil's exports and reduced the entrance of foreign capital into the economy. However, the most important cause was internal, which is associated with economic measures that didn't achieve the expected results. Adopted in 2011, these measures are known as the ' ("new economic matrix", in a free translation). During the economic crisis, high unemploy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Build–operate–transfer
Build–operate–transfer (BOT) or build–own–operate–transfer (BOOT) is a form of project delivery method, usually for large-scale infrastructure projects, wherein a private entity receives a concession (contract), concession from the public sector (or the private sector on rare occasions) to finance, design, construct, own, and operate a facility stated in the concession contract. The private entity will have the right to operate it for a set period of time. This enables the project proponent to recover its investment and operating and maintenance expenses in the project. BOT is usually a model used in public–private partnerships. Due to the long-term nature of the arrangement, the fees are usually raised during the concession period. The rate of increase is often tied to a combination of internal and external variables, allowing the proponent to reach a satisfactory internal rate of return for its investment. Countries where BOT is prevalent include Thailand, Turkey, Tai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eletrobras
Centrais Elétricas Brasileiras S.A. (commonly referred to as Electrobras, ) is a major Brazilian electric utilities company. The company's headquarters are located in Rio de Janeiro. It is Latin America's biggest power utility company, tenth largest in the world, and is also the fourth largest clean energy company in the world. Eletrobras holds stakes in a number of Brazilian electric companies, so that it generates about 40% and transmits 69% of Brazil's electric supply. The company's generating capacity is about 51,000 MW, mostly in hydroelectric plants. The Brazilian federal government owned 52% stake in Eletrobras until June 2022, the rest of the shares traded on B3. The stock is part of the Ibovespa index. It is also traded on the Nasdaq Stock Market and on the Madrid Stock Exchange. History Eletrobras was established in 1962 during João Goulart's presidency. Operations Eletrobras is an electric power holding company. It is the largest generation and transmissio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Watt
The watt (symbol: W) is the unit of Power (physics), power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantification (science), quantify the rate of Work (physics), energy transfer. The watt is named in honor of James Watt (1736–1819), an 18th-century Scottish people, Scottish inventor, mechanical engineer, and chemist who improved the Newcomen engine with his own Watt steam engine, steam engine in 1776, which became fundamental for the Industrial Revolution. Overview When an object's velocity is held constant at one meter per second against a constant opposing force of one Newton (unit), newton, the rate at which Work (physics), work is done is one watt. \mathrm. In terms of electromagnetism, one watt is the rate at which electrical work is performed when a current of one ampere (A) flows across an electrical potential difference of one volt (V), meaning the watt is equivalent to the vo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Río Grande De Matagalpa
Río Grande de Matagalpa (, ''Awaltara'' in Miskito language, Miskito, ''Ucumulalí'' in Matagalpa language, Matagalpa) is a river of Nicaragua. Running from its source near Matagalpa to the Caribbean Sea in the northern part of the South Caribbean Coast Autonomous Region, South Caribbean Autonomous Region it is the second longest river in Nicaragua. It gives it name to the city and municipality of La Cruz de Río Grande. The Tumarín Dam is being constructed on its lower reaches. References Britannica: Rio grande de Matagalpa * Rivers of Nicaragua {{Nicaragua-river-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central America
Central America is a subregion of North America. Its political boundaries are defined as bordering Mexico to the north, Colombia to the southeast, the Caribbean to the east, and the Pacific Ocean to the southwest. Central America is usually defined as consisting of seven countries: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama. Within Central America is the Mesoamerican biodiversity hotspot, which extends from southern Mexico to southeastern Panama. Due to the presence of several active geologic faults and the Central America Volcanic Arc, there is a high amount of seismic activity in the region, such as volcanic eruptions and earthquakes, which has resulted in death, injury, and property damage. Most of Central America falls under the Isthmo-Colombian cultural area. Before the Spanish expedition of Christopher Columbus' voyages to the Americas, hundreds of indigenous peoples made their homes in the area. From the year 1502 onwards, Spain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydropower
Hydropower (from Ancient Greek -, "water"), also known as water power or water energy, is the use of falling or fast-running water to Electricity generation, produce electricity or to power machines. This is achieved by energy transformation, converting the Potential energy, gravitational potential or kinetic energy of a water source to produce power. Hydropower is a method of sustainable energy production. Hydropower is now used principally for Hydroelectricity, hydroelectric power generation, and is also applied as one half of an energy storage system known as pumped-storage hydroelectricity. Hydropower is an attractive alternative to fossil fuels as it does not directly produce Carbon dioxide in Earth's atmosphere, carbon dioxide or other Air pollution, atmospheric pollutants and it provides a relatively consistent source of power. Nonetheless, it has economic, sociological, and environmental downsides and requires a sufficiently energetic source of water, such as a river or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
