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85-479: Designs for the dam were drawn up in 1992 and 1993 before bidding was carried out in December of that same year. An RCC design was chosen to reduce costs and risks associated with excavating a larger foundation for an arch dam . Funding was acquired for the project by December 1997 when construction began. The power plant was operational in 2002 and the project was completed in 59 months, seven months ahead of time. The dam

170-902: A county of the Christian Kingdom of León in 868, and ultimately as an independent Kingdom with the Treaty of Zamora in 1143. During the Age of Discovery , the Kingdom of Portugal established itself as a major economic and political power, largely through its maritime empire, which extended mostly along the South Atlantic and Indian Ocean coasts. Portuguese explorers and merchants were instrumental in establishing trading posts and colonies that enabled control over spices and slave trades. While Portugal expanded its influence globally, its political and military power faced internal and external challenges towards

255-669: A nobility , which played a key social and political role during the Middle Ages . It was under the Visigoths that the Church began to play an important part within the state. As the Visigoths did not learn Latin from the local people, they had to rely on bishops to continue the Roman system of governance. The laws were made by councils of bishops, and the clergy emerged as a high-ranking class. Today's continental Portugal, along with most of modern Spain,

340-618: A transcontinental nation and not a colonial empire. Pro-Indian residents of Dadra and Nagar Haveli , separated those territories from Portuguese rule in 1954. In 1961, Fort of São João Baptista de Ajudá 's annexation by the Republic of Dahomey was the start of a process that led to the dissolution of the centuries-old Portuguese Empire. Another forcible retreat occurred in 1961 when Portugal refused to relinquish Goa . The Portuguese were involved in armed conflict in Portuguese India against

425-764: A career as the Portuguese Ambassador in London, later in Vienna. King Joseph I was crowned in 1750 and made him his Minister of Foreign Affairs. As the King's confidence in Carvalho e Melo increased, he entrusted him with more control of the state. By 1755, Carvalho e Melo was made prime minister. Impressed by British economic success witnessed as Ambassador, he successfully implemented similar economic policies in Portugal. In 1761, during

510-483: A distinct capital and governor. The main cities were in the southern half of the country: Beja , Silves , Alcácer do Sal , Santarém and Lisbon . The Muslim population consisted mainly of native Iberian converts to Islam and Berbers . The Arabs (mainly noblemen from Syria ) although a minority, constituted the elite. The Berbers who joined them, were nomads from the Rif Mountains of North Africa. Invasions from

595-660: A federation contract with Emperor Honorius , many of these people settled in Hispania . An important group was made up of the Suebi and Vandals in Gallaecia , who founded a Suebi Kingdom with its capital in Braga . They came to dominate Aeminium ( Coimbra ) as well, and there were Visigoths to the south. The Suebi and the Visigoths were the Germanic tribes who had the most lasting presence in

680-578: A line west of the Cape Verde islands, off the west coast of Africa. In 1498 Vasco da Gama became the first European to reach India by sea, bringing economic prosperity to Portugal and helping to start the Portuguese Renaissance . In 1500, the Portuguese explorer Gaspar Corte-Real reached what is now Canada and founded the town of Portugal Cove-St. Philip's , one of many Portuguese colonies of

765-566: A single railway. The government of Portugal quietly accepted the ultimatum and withdrew their forces from the disputed area, leading to a widespread backlash among the Portuguese public, who viewed acceptance of the British demands as a humiliation. On 5 October 1910, a coup d'état overthrew the near 800 year-old Monarchy and the Republic was proclaimed. During World War I, Portugal helped the Allies fight

850-741: Is 445.5 metres (1,462 ft). On the left bank of the reservoir near the dam is the intake for the Miel I Hydroelectric Station which is controlled by two floodgates. In 2010 the Guarinó diversion dam on the Guarinó River was opened and the Manso diversion dam on the Manso River began operations in 2013. Both divert water into the Amani Reservoir through tunnels. The Miel I Hydroelectric Power Plant receives water from

935-424: Is 6,565 ft (2,001 m) while the multiple-arch section is 4,284 ft (1,306 m) long and its combination with the spillway sections measure 5,145 ft (1,568 m). Each arch in the dam has a clear span of 60 ft (18 m) and each buttress is 24 ft (7.3 m) wide. Arch dam designs would continue to test new limits and designs such as the double- and multiple-curve. Alfred Stucky and

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1020-534: Is a 340-metre (1,120 ft) long RCC gravity-type containing 1,750,000 cubic metres (2,290,000 cu yd) of concrete. It is located just east of the confluence of the Moro and La Miel Rivers. At the center of the structure and running down its downstream dace, is an uncontrolled overflow spillway with a nominal capacity of 1,720 cubic metres per second (61,000 cu ft/s) and maximum discharge capacity of 3,600 cubic metres per second (130,000 cu ft/s) (at

1105-406: Is a concrete dam that is curved upstream in plan. The arch dam is designed so that the force of the water against it, known as hydrostatic pressure , presses against the arch, causing the arch to straighten slightly and strengthening the structure as it pushes into its foundation or abutments. An arch dam is most suitable for narrow canyons or gorges with steep walls of stable rock to support

1190-787: Is a country in the Iberian Peninsula in Southwestern Europe . Featuring the westernmost point in continental Europe , to its north and east is Spain, with which it shares the longest uninterrupted border in the European Union ; to the south and the west is the North Atlantic Ocean ; and to the west and southwest lie the Macaronesian archipelagos of the Azores and Madeira , which are two autonomous regions of Portugal . Lisbon

1275-718: Is a member of the United Nations , the European Union, the Schengen Area , and the Council of Europe , as well as a founding members of NATO , the eurozone , the OECD , and the Community of Portuguese Language Countries . The word Portugal derives from the combined Roman - Celtic place name Portus Cale (present-day's conurbation of Porto and Vila Nova de Gaia ). Porto stems from

1360-789: Is part of the Miel I Hydroelectric Station and is officially called the Patángoras Dam but is commonly referred to as the Miel I Dam. The U.S. Army Corps of Engineers was involved in the testing of the concrete for the dam. Drums of aggregates, cement, sand and soil were shipped to their North Pacific Division Materials Laboratory in Troutdale, Oregon. The materials were separated and tested for various properties. RCC concrete cylinders and beams were batched and poured. Tests were performed, for 7, 28, 90, 180 and 365 days. Tests included compressive strength, tensile strength, expansion, and slow load beams. The testing required almost 2 years to complete. The dam

1445-468: Is the capital and largest city , followed by Porto , which is the only other metropolitan area . The western part of the Iberian Peninsula has been continuously inhabited since prehistoric times , with the earliest signs of settlement dating to 5500 BCE . Celtic and Iberian peoples arrived in the first millennium BCE , with Phoenician and later Punic influence reaching the south during

1530-555: Is the 400,000-year-old Aroeira 3 H. Heidelbergensis skull discovered in the Cave of Aroeira in 2014. Later Neanderthals roamed the northern Iberian peninsula and a tooth has been found at Nova da Columbeira cave in Estremadura . Homo sapiens sapiens arrived in Portugal around 35,000 years ago and spread rapidly. Pre-Celtic tribes inhabited Portugal. The Cynetes developed a written language, leaving stelae , which are mainly found in

1615-758: The Age of Discovery under the sponsorship of Prince Henry the Navigator . Portugal explored the Atlantic, encountering the Azores , Madeira , and Portuguese Cape Verde , which led to the first colonization movements. The Portuguese explored the Indian Ocean , established trade routes in most of southern Asia, and sent the first direct European maritime trade and diplomatic missions to China ( Jorge Álvares ) and Japan ( Nanban trade ). In 1415, Portugal acquired its first colonies by conquering Ceuta , in North Africa. Throughout

1700-448: The Battle of São Mamede , in the outskirts of Guimarães , in 1128, Afonso Henriques , Count of Portugal, defeated his mother Countess Teresa and her lover Fernão Peres de Trava , establishing himself as sole leader of the county . Afonso continued his father Henry of Burgundy's Reconquista wars. His campaigns were successful and in 1139, he obtained a victory in the Battle of Ourique , so

1785-480: The British government delivered an ultimatum to Portugal, demanding the withdrawal of Portuguese forces from the area between Portugal's colonies of Mozambique and Angola . The area had been claimed by Portugal as part of its colonialist Pink Map project, but Britain disputed these claims, mostly due to Cecil Rhodes ' aspirations to create a Cape to Cairo Railway , which was intended to link all British colonies via

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1870-541: The Carnation Revolution of 1974 , and brought an end to the Portuguese Colonial War, allowing the last of Portugal’s African territories to achieve independence. Portugal's imperial history has left a cultural legacy , with around 300 million Portuguese speakers around the world. Today, it is a developed country with an advanced economy relying chiefly upon services, industry, and tourism. Portugal

1955-862: The Central Powers ; however the war hurt its weak economy. Political instability and economic weaknesses were fertile ground for chaos and unrest during the First Portuguese Republic . These conditions led to the failed Monarchy of the North , 28 May 1926 coup d'état , and creation of the National Dictatorship ( Ditadura Nacional ). This in turn led to the right-wing dictatorship of the Estado Novo (New State), under António de Oliveira Salazar in 1933. Portugal remained neutral in World War II . From

2040-466: The Companhia Geral de Pernambuco e Paraíba - whose main activity was the trafficking of slaves, mostly Africans, to Brazilian lands. He reorganized the army and navy and ended legal discrimination against different Christian sects. He created companies and guilds to regulate commercial activity and one of the first appellation systems by demarcating the region for production of Port to ensure

2125-687: The Continental System of embargo against the United Kingdom; a French invasion under General Junot followed, and Lisbon was captured in 1807. British intervention in the Peninsular War helped maintain Portuguese independence; the last French troops were expelled in 1812. Rio de Janeiro in Brazil was the Portuguese capital between 1808 and 1821. In 1820, constitutionalist insurrections took place at Porto and Lisbon. Lisbon regained its status as

2210-715: The Indian Armed Forces . The operations resulted in the defeat and loss of the remaining Portuguese territories in the Indian subcontinent . The Portuguese regime refused to recognize Indian sovereignty over the annexed territories, which continued to be represented in the National Assembly until the coup of 1974. Also in the early 1960s the independence movements in the Portuguese provinces of Portuguese Angola , Portuguese Mozambique , and Portuguese Guinea in Africa, resulted in

2295-454: The Jesuits were suppressed and expelled . This crushed opposition by publicly demonstrating even the aristocracy was powerless before Pombal. Further titled "Marquês de Pombal" in 1770, he ruled Portugal until Joseph I's death in 1777. The new ruler, Queen Maria I of Portugal , disliked Pombal because of his excesses, and upon her accession to the throne, withdrew all his political offices. Pombal

2380-660: The Moluccas . Although it was believed the Dutch were the first Europeans to arrive in Australia, there is evidence the Portuguese may have discovered it in 1521. Between 1519 and 1522 Ferdinand Magellan organized a Spanish expedition to the East Indies which resulted in the first circumnavigation of the globe. The Treaty of Zaragoza , signed in 1529 between Portugal and Spain, divided

2465-536: The Portuguese Colonial War (lasting from 1961 till 1974). The war mobilized around 1.4 million men for military or for civilian support service, and led to large casualties. Throughout the colonial war period Portugal dealt with increasing dissent, arms embargoes and other punitive sanctions imposed by the international community. The authoritarian and conservative Estado Novo regime, first governed by Salazar and from 1968 by Marcelo Caetano , tried to preserve

2550-602: The Romans in the 1st century BC and after several designs and techniques were developed, relative uniformity was achieved in the 20th century. The first known arch dam, the Glanum Dam , also known as the Vallon de Baume Dam, was built by the Romans in France and it dates back to the 1st century BC. The dam was about 12 metres (39 ft) high and 18 metres (59 ft) in length. Its radius

2635-669: The "absolutist" faction of landowners and the church to proclaim Miguel king in February 1828. This led to the Liberal Wars , also known as the War of the Two Brothers or the Portuguese Civil War , in which Pedro forced Miguel to abdicate and go into exile in 1834 and place his daughter on the throne as Queen Maria II of Portugal . After 1815 the Portuguese expanded their trading ports along

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2720-554: The 15th century, Portuguese explorers sailed the coast of Africa, establishing trading posts for commodities , ranging from gold to slavery . Portugal sailed the Portuguese India Armadas to Goa via the Cape of Good Hope . The Treaty of Tordesillas of 1494 was intended to resolve a dispute created following the return of Christopher Columbus and divided the newly located lands outside Europe between Portugal and Spain along

2805-494: The 1940s to 1960s, Portugal was a founding member of NATO , OECD , the European Free Trade Association (EFTA) and joined the United Nations in 1955. New economic development projects and relocation of mainland Portuguese citizens into the overseas provinces in Africa were initiated, with Angola and Mozambique being the main targets of those initiatives. These actions were used to affirm Portugal's status as

2890-414: The 7th and 8th centuries, and by the 9th century, it was used to refer to the region between the rivers Douro and Minho . By the 11th and 12th centuries, Portugale , Portugallia , Portvgallo or Portvgalliae was already referred to as Portugal . The region has been inhabited by humans since circa 400,000 years ago, when Homo heidelbergensis entered the area. The oldest human fossil found in Portugal

2975-490: The African coast, moving inland to take control of Angola and Mozambique. The slave trade was abolished in 1836. In Portuguese India , trade flourished in the colony of Goa , with its subsidiary colonies of Macau , near Hong Kong, and Timor , north of Australia. The Portuguese successfully introduced Catholicism and the Portuguese language into their colonies, while most settlers continued to head to Brazil. On 11 January 1890,

3060-749: The Americas . In 1500, Pedro Álvares Cabral landed on Brazil and claimed it for Portugal. Ten years later, Afonso de Albuquerque conquered Goa in India, Muscat and Ormuz in the Persian Strait , and Malacca , now in Malaysia. Thus, the Portuguese empire held dominion over commerce in the Indian Ocean and South Atlantic. Portuguese sailors set out to reach Eastern Asia, landing in Taiwan , Japan, Timor , Flores , and

3145-422: The Christian kingdoms of the north. Most of present-day Portugal fell into the hands of the Taifa of Badajoz of the Aftasid Dynasty , and in 1022 the Taifa of Seville of the Abbadids poets. The Taifa period ended with the conquest of the Almoravids in 1086, then by the Almohads in 1147. Al-Andaluz was divided into districts called Kura . Gharb Al-Andalus at its largest consisted of ten kuras, each with

3230-411: The Far East, resulting in the loss of Portugal's Indian sea trade monopoly. In 1640 John IV of Portugal spearheaded an uprising backed by disgruntled nobles and was proclaimed king. The Portuguese Restoration War ended the 60-year period of the Iberian Union under the House of Habsburg . This was the beginning of the House of Braganza , which reigned until 1910. John V saw a reign characterized by

3315-437: The Latin for port , portus ; Cale ' s meaning and origin is unclear. The mainstream explanation is an ethnonym derived from the Callaeci, also known as the Gallaeci peoples, who occupied the north-west of the Iberian Peninsula . One theory proposes Cale is a derivation of the Celtic word for 'port'. Another is that Cala was a Celtic goddess. Some French scholars believe it may have come from Portus Gallus ,

3400-427: The Moors. In 1249, the Reconquista ended with the capture of the Algarve and expulsion of the last Moorish settlements. With minor readjustments, Portugal's territorial borders have remained the same, making it one of the oldest established nations in Europe. After a conflict with the kingdom of Castile , Denis of Portugal signed the Treaty of Alcañices in 1297 with Ferdinand IV of Castile. This treaty established

3485-416: The North also occurred in this period, with Viking incursions raiding the coast between the 9th and 11th centuries, including Lisbon. This resulted in the establishment of small Norse settlements in the coastline between Douro and Minho . The Reconquista was a period when Christians reconquered the Iberian Peninsula from Moorish domination. An Asturian Visigothic noble named Pelagius of Asturias

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3570-403: The Pacific Ocean between Spain and Portugal. Portugal voluntarily entered a dynastic union (1580–1640) because the last two kings of the House of Aviz died without heirs, resulting in the Portuguese succession crisis of 1580 . Philip II of Spain claimed the throne and was accepted as Philip I of Portugal. Portugal did not lose its formal independence, forming a union of kingdoms. But

3655-519: The Roman conquest. In southern Portugal, some small, semi-permanent commercial coastal settlements were also founded by Phoenician-Carthaginians. Romans first invaded the Iberian Peninsula in 219 BC. The Carthaginians, Rome's adversary in the Punic Wars , were expelled from their coastal colonies. During Julius Caesar 's rule, almost the entire peninsula was annexed to Rome. The conquest took two hundred years and many died, including those sentenced to work in slave mines or sold as slaves to other parts of

3740-451: The Salmon Creek Dam allowed for larger and taller dam designs. The dam was, therefore, revolutionary, and similar designs were soon adopted around the world, in particular by the U.S. Bureau of Reclamation . In 1920, the Swiss engineer and dam designer Alfred Stucky developed new calculation methods for arch dams, introducing the concept of elasticity during the construction of the Montsalvens arch dam in Switzerland, thereby improving

3825-406: The U.S. Bureau of Reclamation developed a method of weight and stress distribution in the 1960s, and arch dam construction in the United States would see its last surge then with dams like the 143-meter double-curved Morrow Point Dam in Colorado, completed in 1968. By the late 20th century, arch dam design reached a relative uniformity in design around the world. Currently, the tallest arch dam in

3910-428: The United States. Its NRHP application states that this was because three dams of this type failed: (1) Gem Lake Dam, St. Francis Dam (California), Lake Hodges Dam (California). None of these failures were inherently caused by the multiple arch design. The design of an arch dam is a very complex process. It starts with an initial dam layout, that is continually improved until the design objectives are achieved within

3995-429: The border between the kingdoms of Portugal and Leon. The reigns of Denis, Afonso IV , and Peter I mostly saw peace with the other kingdoms of Iberia. In 1348-49 Portugal, as with the rest of Europe, was devastated by the Black Death . In 1373, Portugal made an alliance with England , the oldest standing alliance in the world. In 1383 John I of Castile , Beatrice of Portugal , and Ferdinand I of Portugal claimed

4080-531: The capital of Portugal when Brazil declared its independence in 1822. The death of King John VI in 1826 led to a crisis of royal succession. His eldest son, Pedro I of Brazil , briefly became Pedro IV of Portugal , but neither the Portuguese nor Brazilians wanted a unified monarchy; consequently, Pedro abdicated the Portuguese crown in favor of his 7-year-old daughter, Maria da Glória , on the condition that when she came of age she would marry his brother, Miguel . Dissatisfaction at Pedro's constitutional reforms led

4165-414: The crest. A dam that is double-curved in both its horizontal and vertical planes may be called a dome dam . Arch dams with more than one contiguous arch or plane are described as multiple-arch dams . Early examples include the Roman Esparragalejo Dam with later examples such as the Daniel-Johnson Dam (1968) and Itaipu Dam (1982). However, as a result of the failure of the Gleno Dam shortly after it

4250-400: The dam profile in the vertical direction by using a parabolic arch shape instead of a circular arch shape. Pensacola Dam , completed in the state of Oklahoma in 1940, was considered the longest multiple arch dam in the United States. Designed by W. R. Holway , it has 51 arches. and a maximum height of 150 ft (46 m) above the river bed. The total length of the dam and its sections

4335-476: The dam via a 6.5-metre (21 ft) diameter tunnel which splits into three 3.35 metres (11.0 ft) diameter penstocks before reaching each turbine. The power house is located underground and contains a machine, transformer and surge tank chambers. Power is produced by three 132 megawatts (177,000 hp) Francis turbine generators for a total installed capacity of 396 megawatts (531,000 hp). Download coordinates as: Arch dam An arch dam

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4420-447: The dam's crest elevation of 454 metres (1,490 ft)). A discharge tunnel is also located at the base of the dam, on its right bank, which has a capacity of 250 cubic metres per second (8,800 cu ft/s). The reservoir created by the dam, Amani Reservoir, has a storage capacity of 571 million cubic metres (463,000 acre⋅ft) and surface area of 1,220 hectares (3,000 acres). The reservoir's normal elevation above sea level

4505-586: The design criteria. The main loads for which an arch dam is designed are: Other miscellaneous loads that affect a dam include: ice and silt loads, and uplift pressure. Most often, the arch dam is made of concrete and placed in a V-shaped valley. The foundation or abutments for an arch dam must be very stable and proportionate to the concrete. There are two basic designs for an arch dam: constant-radius dams , which have constant radius of curvature, and variable-radius dams , which have both upstream and downstream curves that systematically decrease in radius below

4590-408: The earthquake, Joseph I gave his prime minister more power, and Carvalho de Melo became an enlightened despot . In 1758 Joseph I was wounded in an attempted assassination. The Marquis of Távora , several members of his family and even servants were tortured and executed in public with extreme brutality (even by the standards of the time), as alleged part of the Távora affair . The following year,

4675-408: The empire. Roman occupation suffered a setback in 155 BC, when a rebellion began in the north. The Lusitanians and other native tribes, under the leadership of Viriathus , wrested control of all of western Iberia. Rome sent legions to quell the rebellion but were unsuccessful. Roman leaders bribed Viriathus's allies to kill him in 139 BC; he was replaced by Tautalus . In 27 BC, Lusitania gained

4760-427: The end of the 16th century. The dynastic crisis marked the beginning of the country's political decline that led to the Iberian Union (1580-1640), a period in which Portugal was united under Spanish rule. While maintaining a degree of self-governance, the union strained Portugal’s autonomy and drew it into conflicts with European powers which targeted Portuguese territories and trade routes. Portugal's prior opulence

4845-436: The first cities he founded is Vimaranes, known today as Guimarães – "birthplace of the Portuguese nation" or the "cradle city". After annexing the County of Portugal into one of the counties that made up the Kingdom of Asturias , King Alfonso III of Asturias knighted Vímara Peres, in 868, as the First Count of Portus Cale (Portugal). The region became known as Portucale , Portugale , and simultaneously Portugália . With

4930-403: The forced abdication of Alfonso III in 910, the Kingdom of Asturias split into three separate kingdoms; they were reunited in 924 under the crown of León . In 1093 Alfonso VI of León bestowed the county to Henry of Burgundy and married him to his daughter, Teresa of León . Henry thus became Henry, Count of Portugal and based his newly formed county from Bracara Augusta (modern Braga ). At

5015-503: The influx of gold into the royal treasury, supplied largely by the royal fifth (tax on precious metals) from the Portuguese colonies of Brazil and Maranhão . Most estimates place the number of Portuguese migrants to Colonial Brazil during the gold rush of the 18th century at 600,000. This represented one of the largest movements of European populations to their colonies, during colonial times. In 1738 Sebastião José de Carvalho e Melo , later ennobled as 1st Marquis of Pombal , began

5100-503: The joining of the two crowns deprived Portugal of an independent foreign policy, and led to its involvement in the Eighty Years' War between Spain and the Netherlands. War led to a deterioration of relations with Portugal's oldest ally, England , and the loss of Hormuz , a strategic trading post located between Iran and Oman . From 1595 to 1663 the Dutch-Portuguese War primarily involved Dutch companies invading Portuguese colonies and commercial interests in Brazil, Africa, India and

5185-427: The liberation during the Peninsular War , Portugal endured a period marked by a civil war between liberals and absolutists from 1828 to 1834. The monarchy was overthrown in the 1910 revolution, which led to the establishment of the Portuguese First Republic . A phase of unrest ultimately led to the rise of authoritarian regimes of the Ditadura Nacional and the Estado Novo . Democracy was finally restored following

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5270-464: The local inhabitants. St. Martin of Braga was a particularly influential evangelist. In 429, the Visigoths moved south to expel the Alans and Vandals and founded a kingdom with its capital in Toledo . From 470, conflict between the Suebi and Visigoths increased. In 585, the Visigothic King Liuvigild conquered Braga and annexed Gallaecia; the Iberian Peninsula was unified under a Visigothic Kingdom . A new class emerged, unknown in Roman times:

5355-448: The mountains sides. In the early 20th century, the world's first variable-radius arch dam was built on the Salmon Creek near Juneau , Alaska . The Salmon Creek Dam's upstream face bulged upstream, which relieved pressure on the stronger, curved lower arches near the abutments. The dam also had a larger toe, which off-set pressure on the upstream heel of the dam, which now curved more downstream. The technology and economical benefits of

5440-426: The port of the Gauls. Around 200 BC, the Romans took Iberia from the Carthaginians during the Second Punic War . In the process they conquered Cale, renaming it Portus Cale ('Port of Cale') and incorporating it into the province of Gallaecia . During the Middle Ages , the region around Portus Cale became known by the Suebi and Visigoths as Portucale . The name Portucale changed into Portugale during

5525-441: The reign of King José I, he banned the import of black slaves into mainland Portugal and India, not for humanitarian reasons, but because they were a necessary work force in Brazil. At the same time, he encouraged the trade of black slaves ("the pieces", in the terms of that time) to that colony, and with the support and direct involvement of the Marquis of Pombal, two companies were founded - the Companhia do Grão-Pará e Maranhão and

5610-421: The same period. The region came under Roman control in the second century BCE, followed by a succession of Germanic peoples and the Alans from the fifth to eighth centuries CE. Muslims conquered most of the Iberian Peninsula in the eighth century CE, but were gradually expelled by the Christian Reconquista over the next several centuries. Modern Portugal began taking shape during this period, initially as

5695-430: The south. Early in the first millennium BC, several waves of Celts invaded Portugal from Central Europe and intermarried with the local populations to form several different ethnic groups. The Celtic presence is patent in archaeological and linguistic evidence. They dominated most of northern and central Portugal, while the south maintained its older character (believed non-Indo-European, likely related to Basque ) until

5780-427: The status of Roman province . Later, a northern province was separated from the province of Tarraconensis , under Emperor Diocletian 's reforms, known as Gallaecia . There are still ruins of castros ( hill forts ) and remains of the Castro culture , like Conímbriga , Mirobriga and Briteiros . In 409, with the decline of the Roman Empire , the Iberian Peninsula was occupied by Germanic tribes . In 411, with

5865-425: The structure and stresses. Since they are thinner than any other dam type, they require much less construction material, making them economical and practical in remote areas. In general, arch dams are classified based on the ratio of the base thickness to the structural height (b/h) as: Arch dams classified with respect to their structural height are: The development of arch dams throughout history began with

5950-494: The territories corresponding to modern Portugal. As elsewhere in Western Europe, there was a sharp decline in urban life during the Dark Ages . Roman institutions disappeared in the wake of the Germanic invasions with the exception of ecclesiastical organizations, which were fostered by the Suebi in the fifth century and adopted by the Visigoths afterwards. Although the Suebi and Visigoths were initially followers of Arianism and Priscillianism , they adopted Catholicism from

6035-410: The throne of Portugal. John of Aviz, later John I of Portugal , defeated the Castilians in the Battle of Aljubarrota , and the House of Aviz became the ruling house. The new ruling dynasty led Portugal to the limelight of European politics and culture. They created and sponsored literature, such as a history of Portugal, by Fernão Lopes . Portugal spearheaded European exploration of the world and

6120-565: The vast Umayyad Caliphate's empire of Damascus , until its collapse in 750. That year the west of the empire gained its independence under Abd-ar-Rahman I with the establishment of the Emirate of Córdoba . The Emirate became the Caliphate of Córdoba in 929, until its dissolution in 1031, into 23 small kingdoms, called Taifa kingdoms. The governors of the taifas proclaimed themselves Emir of their provinces and established diplomatic relations with

6205-578: The war of Christian reconquest. At the end of the 9th century, the region of Portugal between the rivers Minho and Douro, was reconquered from the Moors by nobleman and knight Vímara Peres on the orders of King Alfonso III of Asturias . Finding many towns deserted, he decided to repopulate and rebuild them. Vímara Peres elevated the region to the status of County , naming it the County of Portugal after its major port city – Portus Cale or modern Porto . One of

6290-486: The wine's quality. This was the first attempt to control wine quality and production in Europe. He imposed strict law upon all classes of Portuguese society, along with a widespread review of the tax system. These reforms gained him enemies in the upper classes. Lisbon was struck by a major earthquake on November 1st 1755 , magnitude estimated to have been between 7.7–9.0, with casualties ranging from 12,000 to 50,000. Following

6375-575: The world is the 305 metres (1,001 ft) Jingpin-I Dam in China , which was completed in 2013. The longest multiple arch with buttress dam in the world is the Daniel-Johnson Dam in Quebec , Canada . It is 214 meters (702 ft) high and 1,314 meters (4,311 ft) long across its crest. It was completed in 1968 and put in service in 1970. Pensacola Dam was one of the last multiple arch types built in

6460-618: Was about 14 m (46 ft), and it consisted of two masonry walls. The Romans built it to supply nearby Glanum with water. The Monte Novo Dam in Portugal was another early arch dam built by the Romans in 300 AD. It was 5.7 metres (19 ft) high and 52 m long (171 ft), with a radius of 19 m (62 ft). The curved ends of the dam met with two winged walls that were later supported by two buttresses. The dam also contained two water outlets to drive mills downstream. The Dara Dam

6545-402: Was another arch dam built by the Romans in which the historian Procopius would write of its design: "This barrier was not built in a straight line, but was bent into the shape of a crescent, so that the curve, by lying against the current of the river, might be able to offer still more resistance to the force of the stream." The Mongols also built arch dams in modern-day Iran. Their earliest

6630-441: Was banished to his estate at Pombal , where he died in 1782. Historians argue that Pombal's "enlightenment," while far-reaching, was primarily a mechanism for enhancing autocracy at the expense of individual liberty and especially an apparatus for crushing opposition, suppressing criticism, and furthering colonial exploitation and consolidating personal control, and profit. In 1807 Portugal refused Napoleon 's demand to accede to

6715-516: Was constructed in 1923, the construction of new multiple arch dams has become less popular. Contraction joints are normally placed every 20 m in the arch dam and are later filled with grout after the control cools and cures. Portugal – in Europe  (green & dark grey) – in the European Union  (green) Portugal , officially the Portuguese Republic ,

6800-568: Was elected leader in 718 by many of the ousted Visigoth nobles. Pelagius called for the remnants of the Christian Visigothic armies to rebel against the Moors and regroup in the unconquered northern Asturian highlands, known today as the Cantabrian Mountains , in north-west Spain. After defeating the Moors in the Battle of Covadonga in 722, Pelagius was proclaimed king, thus founding the Christian Kingdom of Asturias and starting

6885-521: Was further exacerbated by a series of events, such as the Portuguese Restoration War and the 1755 Lisbon earthquake , which destroyed the city and damaged the empire's economy. The Napoleonic Wars motivated the Portuguese royal family to relocate to Brazil in 1807. This event reshaped the relationship between Portugal and Brazil, culminating in Brazilian independence in 1822 . Following

6970-624: Was invaded from the South and became part of al-Andalus between 726 and 1249, following the Umayyad Caliphate conquest of the Iberian Peninsula . This rule lasted decades in the North, up to five centuries in the South. After defeating the Visigoths in a few months, the Umayyad Caliphate started expanding rapidly in the peninsula. Beginning in 726, the land that is now Portugal became part of

7055-492: Was of masonry design and built in a very narrow canyon. The canyon was so narrow that its crest length is only 44% of its height. The dam is still erect, even though part of its lower downstream face fell off. The Tibi Dam in Tibi , Spain was a post-medieval arch dam built between 1579 and 1594 and the first in Europe since the Romans. The dam was 42.7 metres (140 ft) high and 65 metres (213 ft) long. This arch dam rests on

7140-553: Was proclaimed King of Portugal by his soldiers. This is traditionally taken as the occasion when the County of Portugal became the independent Kingdom of Portugal and, in 1129, the capital city was transferred from Guimarães to Coimbra. Afonso was recognized as the first king of Portugal in 1143 by King Alfonso VII of León , and in 1179 by Pope Alexander III as Afonso I of Portugal. Afonso Henriques and his successors, aided by military monastic orders , continued pushing southwards against

7225-510: Was the Kebar Dam built around 1300, which was 26 m (85 ft) high and 55 m (180 ft) long, and had a radius of 35 m (115 ft). Their second dam was built around 1350 and is called the Kurit Dam . After 4 m (13 ft) was added to the dam in 1850, it became 64 m (210 ft) tall and remained the tallest dam in the world until the early 20th century. The Kurit Dam

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