Samuel Hydroelectric Dam
| Samuel Hydroelectric Dam | |
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Satellite image. Deforestation (light colour fishbone patterns) is clearly visible
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 Location of Samuel Hydroelectric Dam in Brazil
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| Official name | Usina Hidrelétrica Samuel |
| Country | Brazil |
| Location | Rondônia |
| Coordinates | 8°45′06″S 63°27′17″W / 8.751663°S 63.454669°WCoordinates: 8°45′06″S 63°27′17″W / 8.751663°S 63.454669°W |
| Purpose | Hydroelectric power generation |
| Status | Active |
| Construction began | April 1982 |
| Opening date | 24 July 1989 |
| Owner(s) | Eletrobras Eletronorte |
| Reservoir | |
| Active capacity | 3,200,000,000 cubic metres (1.1×1011 cu ft) |
| Surface area | 560 square kilometres (220 sq mi) |
| Maximum length | 40 kilometres (25 mi) |
| Maximum width | 20 kilometres (12 mi) |
| Normal elevation | 97 metres (318 ft) |
| Power station | |
| Operator(s) | Eletrobras Eletronorte |
| Installed capacity | 216 MW |
| Capacity factor | 85 MW assured output |
The Samuel Hydroelectric Dam (Portuguese: Usina Hidrelétrica Samuel) is a 216 MW hydroelectric dam near Porto Velho, Rondônia, Brazil. The project was controversial since it had a major environmental impact and during operations released more greenhouse gases than a comparable oil-fuelled plant.
The Samuel dam impounds the Jamari River, a right tributary of the Madeira River. It is about 50 kilometres (31 mi) from Porto Velho. The Jamari River originates in the Pacaás Novos Mountains to the south at an altitude of about 500 metres (1,600 ft). The catchment area is just 15,280 square kilometres (5,900 sq mi), or 24 times the area of the reservoir. The river delivers an annual flow of 366 cubic metres (12,900 cu ft) per second.
The dam contains a volume of 3,200,000,000 cubic metres (1.1×1011 cu ft) and covers 560 square kilometres (220 sq mi) at normal maximum level of 97 metres (318 ft) above sea level. The main reservoir is 25 kilometres (16 mi) long by 15 to 20 kilometres (9.3 to 12.4 mi) wide, and extends further to the south for another 15 kilometres (9.3 mi) with a width of 3 to 1 kilometre (1.86 to 0.62 mi). Since the terrain is relatively flat, 57 kilometres (35 mi) of dikes were built along the right and left banks to hold the water.
Construction began towards the end of a period of military dictatorship, during the abertura transition to democracy. The governor of the federal territory of Rondônia was the army colonel Jorge Teixeira. Teixerira was a strong promoter of development in Rondônia. The hydroelectric project was linked to the 1982 POLONOROESTE project funded by the World Bank that rebuilt and paved the BR-364 highway and opened Rondônia to a flood of migrants from the state of Paraná. The road project caused a surge of deforestation and had a large impact on the indigenous people. In 1987 the World Bank President, Barber Conable, called the road project "a sobering example of an environmentally sound effort which went wrong."
Construction started in April 1982. 238 farming families were relocated. A 1981 World Bank report noted that a large amount of fine timber would have to be removed. This could easily be done using the nearby paved road from Ariquemes to Porto Velho, then via Manaus and Santarém to the overseas markets. The report recommended that the IBDF take an inventory and develop a marketing strategy as soon as possible. The first of five turbines was installed on 24 July 1989 and the last on 2 August 1996. The installed capacity is 216 MW. Cost excluding transmission was US$965 million. With an area / capacity ratio of 2.59 km2/MW the dam compares poorly to most other hydroelectric power plants in the Amazon Region other than Curuá-Una at 2.60 and Balbina at 9.44.
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