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April 27, 1975. For the next three and a half years the flow of the river would be diverted through the tunnels. Each tunnel was 14.8 metres (49 ft) wide and 18 metres (59 ft) high; the north tunnel was 730 metres (2,400 ft) long and the south, 830 metres (2,720 ft). The tunnels were designed to carry the 65-year flood flow of the La Grande River, calculated at 7,500 cubic metres per second (260,000 cu ft/s).
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Robert-Bourassa
Reservoir. To prevent the flooding of an additional 30 square kilometres (12 sq mi) and preserve the lake in its natural state, a pump station was installed which removes water from the Dessaulniers to the Robert-Bourassa Reservoir. The pump station was designed to remove an annual average of 2.8 cubic metres per second (99 cu ft/s), from a drainage area of 160 square kilometres (62 sq mi).
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1071:, required the excavation of 2,350,000 cubic metres (83,000,000 cu ft) of material. The plant was constructed by Rousseau Sauvé Warren (RSW) of Montreal. Unlike other facilities in the James Bay Project, the LG2 was constructed to imperial rather than metric specifications, even though Canada had converted to the metric system in the 1970s.
1036:, is near the north end of the main dam and is part of dike D-4. It consists of a concrete control structure and a man-made waterfall discharging into a stilling basin below the dam. The spillway has eight 12.2-metre (40 ft) wide gates, separated by 4.3-metre (14 ft) thick columns. The gates are opened and closed by cable
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way back into the La Grande river. The channel has 10 steps ranging from 9.1 to 12.2 metres (30 to 40 ft) in height and 127 to 200 metres (417 to 656 ft) in length. The flow rate increases from 11 metres per second (36 ft/s) at the top of the spillway to 22 metres per second (72 ft/s) at the bottom.
995:-Opinaca-La Grande) diversion project. About 19.365 cubic kilometres (15,699,000 acreâ‹…ft) is active or usable storage for power generation, out of a total volume of 61.4 cubic kilometres (49,800,000 acreâ‹…ft). Because of its great size, it is inhabited by a diverse array of aquatic flora and fauna.
715:, but this was rejected in favor of a more conventional embankment design, partly because of the lower cost, and also because the concrete face would have to be inspected from time to time requiring drainage of the reservoir. Because of the huge size of the reservoir, this would be essentially impossible.
645:, a small mining town located 630 kilometers (390 mi) south of La Grande River. Engineering firm Desjardins, Sauriol and Associates were tasked with the construction of a basic road to the future site and the Cree settlement at Fort George. The deadline was tight: 450 miles (720 km) in 450 days.
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In order to hold the reservoir at its operating height of 175.3 metres (575 ft), 29 dikes surround the reservoir basin at various locations. Dikes D-1 to D-4 are located immediately to the north; D-5 to D-14 (the "Forebay dikes") to the south; and D-17 to D-27 (the "Duncan dikes") about 30 miles
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The first stage of construction was the temporary diversion of the La Grande River; the tunnels had to be big enough to protect the construction site from floods, but not so large as to unnecessarily increase cost. Two diversion tunnels were drilled into the left bank of the river and were opened on
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The temporary road reached the La Grande River in
December 1972, allowing the minimum necessary level of access needed to begin work – namely to construct housing for the thousands of people who would work on the dam for the next decade. A permanent road surfaced with gravel was completed on October
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Having passed through the gates, the kinetic energy of the water is dissipated in a 135-by-122-metre (443 ft Ă— 400 ft) basin at the foot of the control structure. It then flows down a 1,500-metre (4,900 ft) long rock channel with a vertical drop of 110-metre (360 ft) on its
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Benoît, Boucher, Ducharme & Lapointe (ABBDL) was tasked with a feasibility study on the more southerly NBR (Nottaway, Broadback, Rupert) rivers. At RSW the development of the La Grande River was championed by François
Rousseau, one of firm's associates and a former Hydro-Québec senior engineer.
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The pump station was commissioned in June 1977. It has four pumps with a capacity of 1.7 cubic metres per second (60 cu ft/s) each, with a maximum lift of 54.3 metres (178 ft). Each pump is powered by a 1,120 KW (1,500 hp) motor. The pumping station also served to divert water
998:
On
November 27, 1978, the diversion tunnels were closed and water began to back up behind the dam. The enormous reservoir took over a year to completely fill. The water initially rose very fast: 43 metres (141 ft) during the first week, with 15 metres (49 ft) on the first day alone. The
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Since the original construction schedule called for completion on
February 15, 1980, the south diversion tunnel was scheduled to be closed in November 1978, during low river flows in the winter. However, the deadline was revised forward by 60 days, and the tunnel had to be reinforced to withstand
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up to that time, workers at the La Grande-2 site used bulldozers to topple electric generators, damage fuel tanks, and set buildings on fire. The project was delayed a year, and the direct cost of the damage estimated at CAD$ 2 million. The causes were not clear, however three factors have been
571:
Design work on the generating station, dam and reservoir began in
October 1970 when Montreal-based engineering firm Rousseau Sauvé Warren (RSW) was commissioned by Hydro-Québec to prepare a feasibility study for a hydroelectric complex on the La Grande River. Another engineering firm, Asselin,
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The construction of the Duncan dikes partially blocked the flow of the
Dessaulniers River, which is located to the southeast of the Robert-Bourassa Reservoir. The river flowed into Dessaulniers Lake at an elevation of 143.3 metres (470 ft), 32 metres (105 ft) below the level of the
76:, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Knowledge (XXG).
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The main dam is located 117.5 kilometers (73.0 mi) from the mouth of the river, in the transition zone between the plateau and the coastal plain, and has a maximum height of 162 meters (531 ft). Twenty-nine
1060:, it is the largest power station owned by Hydro-Québec, and the largest underground power station in the world. On October 27, 1979, 3,000 people gathered for the dedication of the power plant by Quebec Premier
600:(D17-D27), are located 30 kilometers (19 mi) south. The dam and dykes hold a reservoir covering an area of 2,835 square kilometres (1,095 sq mi) with a useful capacity of 19.365 billion mÂł.
704:. The core is slightly inclined upstream, to increase resistance against the immense pressure of water in the reservoir. The layers above consist of fill zones of varying coarseness, and is surfaced with
1093:(turbines). The two groups have somewhat different characteristics. The turbines manufactured by MIL are lighter, 96 tonnes compared to 111, and have fifteen blades, compared to 11 for the other group.
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nature of the soils in the NBR area. The La Grande option had the added advantages of a lesser impact on First
Nations hunting and fishing, on the boreal forest and would require less flooding..
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The first challenge involved deploying teams of land surveyors and lumberjacks by seaplanes and helicopters to clear a path for a permanent road. Parallel to the path, a few kilometres away, an
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A final decision to build the hydroelectric complex on the La Grande hydrographic system was made in 1972, after engineers determined the NBR project would be less cost effective because of the
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reservoir reached its minimum operational level of 167.6 metres (550 ft) on
September 2, 1979, and reached its normal maximum level of 175.3 metres (575 ft) in December 1979.
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was built to move heavy machinery north. The first milestone was reached on
February 11, 1972, with the opening of the 555 meters (1,821 ft) ice bridge crossing the Rupert River.
696:) and the coastal plain. It has a maximum height of 162 metres (531 ft) and is 2,836 metres (9,304 ft) long at the crest. The core of the earthfill dam is made of glacial
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The Robert-Bourassa dam is located 117.5 kilometres (73.0 mi) from the mouth of the La Grande River, in the transition zone between the Laurentian Plateau (the elevated
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which is impervious, and available in large quantities within a 10 kilometres (6.2 mi) radius of the dam site, due to extensive glaciation of the area during the last
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to generate electricity. The two plants taken together account for more than 20% of Hydro-Québec's total installed capacity of 36,810 MW in 2009. It is Canada's
1056:, formerly named La Grande-2 or LG2, is located underground about 6 kilometres (3.7 mi) downstream of the main dam. With an installed capacity of 5,616
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983:– the vast Robert-Bourassa Reservoir is fed by an upstream catchment of 32,480 square kilometres (12,540 sq mi), plus water diversions from the
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Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.
1085:(SEBJ). Units 1, 3, 5, 7, 10, 12, 14 and 16 were built by Marine Industries Limited (MIL), while units 2, 4, 6, 8, 9, 11, 13 and 15 were built by
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1078:, divided into two sets of eight each, and separated by a mounting area, workshops, control room, elevator shaft and ventilation system.
719:(48 km) further south. They range in size from D-26B, 82 metres (269 ft) long, to D-20, 6,052 metres (19,856 ft) long.
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of various sizes close the reservoir. They are organized in three group: dykes D1-D4 are located north of the spillway, nicknamed the
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Each turbine is rated at 339 MW at a 137-metre (449 ft) head and a speed of 133.33 rpm. The generators are rated at 370
607:, 6 kilometers (3.7 mi) downstream from the main dam. It hosts 16 Francis turbines, set up in two groups of eight each.
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cited: inter-union rivalry, poor working conditions, and the perceived arrogance of American executives at the contractor,
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Content in this edit is translated from the existing French Knowledge (XXG) article at ]; see its history for attribution.
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and its 16 units were gradually commissioned between 1979 and 1981. Annual generation is in the vicinity of 26500 GWh.
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Du génie au pouvoir : Robert A. Boyd, à la gouverne d'Hydro-Québec aux années glorieuses
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Implementing Detailed Efficiency Data for Optimal Use in Hydroelectric Generating Plants
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1938:(in French), Montreal: Société d'énergie de la Baie James/Éditions de la Chenelière,
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and have a design flow of 3,100 cubic metres per second (110,000 cu ft/s).
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442:, pp. 117–180, 370*Hydro-Québec, The La Grande Complex visitor booklet, 2004,
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534:(1970–1976 and 1985–1994) gave the James Bay Project a vital political impetus.
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Complexe hydroélectrique de la Grande-Rivière. Réalisation de la première phase
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20, 1974, at a cost of $ 348 million, and was paved over the next two years.
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away from the Dessaulniers river bed, during the construction of dike D-20.
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to the source of your translation. A model attribution edit summary is
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The generating station itself is located 137.2 meters (450 ft)
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The Robert-Bourassa generating station is the main facility of the
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Hydroelectric Generating Stations (as of December 31, 2009)
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The Robert-Bourassa Reservoir, near the generating station.
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Bolduc, André; Hogue, Clarence; Larouche, Daniel (1989),
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Initially known as La Grande-2, it was renamed after
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Main entrance of the underground generating station.
1100:(MVA), which is increased to 390 MVA in the winter.
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Hydro-Québec, l'hértitage d'un siècle d'électricité
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1979:Hydro-Québec - Robert-Bourassa Generating Facility
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723:Dams and dikes of the Robert-Bourassa development
1605:List of conventional hydroelectric power stations
499:(LG-2-A), commissioned in 1991–1992, it uses the
1540:Electric transformers at the plant's switchyard.
975:The Robert Bourassa Reservoir as seen from space
560:, a large river in Quebec's sparsely populated
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111:accompanying your translation by providing an
56:Click for important translation instructions.
43:expand this article with text translated from
1999:
123:{{Translated|fr|Aménagement Robert Bourassa}}
16:Hydroelectric power station in Québec, Canada
8:
1879:(also available in English, under the title
1783:. See also Auf Der Maur, in Further Reading.
517:list of largest hydroelectric power stations
1881:Hydro-Québec After 100 Years of Electricity
1081:The turbines were built by two partners of
19:"LG-2" redirects here. For other uses, see
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1957:(in French), Montreal: Libre expression,
1895:(in French), Montreal: Libre Expression,
1610:List of hydroelectric stations in Quebec
1600:List of largest power stations in Canada
1955:La Radissonie, le pays de la baie James
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1817:Société d'énergie de la Baie James 1987
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349:61.7 km (50,000,000 acreâ‹…ft)
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1697:"Centrales - Hydro-Québec Production"
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1054:Robert-Bourassa hydroelectric station
357:2,835 km (1,095 sq mi)
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495:Together with the adjacent 2,106 MW
513:largest hydroelectric power station
1932:Société d'énergie de la Baie James
458:Robert-Bourassa generating station
153:Robert-Bourassa generating station
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1312:Generator room and ventilation
550:James Bay hydroelectric project
1916:, Montreal: Libre Expression,
121:You may also add the template
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2117:Publicly owned dams in Canada
1615:Reservoirs and dams in Canada
1104:Power station specifications
515:, ranks in 15th place on the
688:Spillway (left) and main dam
302:2,835 m (9,301 ft)
2112:Dams on the La Grande River
713:concrete-face rock-fill dam
519:and is the world's largest
134:Knowledge (XXG):Translation
93:will aid in categorization.
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45:the corresponding article
1953:Turgeon, Pierre (1992),
1229:Service tunnel and well
294:162 m (531 ft)
170:Centrale Robert-Bourassa
1910:Lacasse, Roger (1983),
1590:Renewable energy portal
1034:Staircase of the Giants
897:Duncan dikes (D14-D27)
862:Forebay dikes (D5-D14)
594:Staircase of the Giants
395:Installed capacity
230:Construction began
132:For more guidance, see
2102:Dams completed in 1981
1913:Baie James, une épopée
1887:Bolduc, André (2000),
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1024:Spillway close up view
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418:Annual generation
315:Spillway capacity
246:Construction cost
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989:Caniapiscau Reservoir
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556:complex built on the
472:power station on the
310:9 m (30 ft)
270:Type of dam
249:C$ 3.8 billion (1987)
214:53.79528°N 77.44056°W
147:Dam in Quebec, Canada
105:copyright attribution
1283:Transformer station
792:North dikes (D1-D4)
460:, formerly known as
408:Capacity factor
21:LG2 (disambiguation)
1773:The Tyranny of Work
1701:www.hydroquebec.com
1362:Drainage galleries
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660:Temporary diversion
617:Bechtel Corporation
346:Total capacity
219:53.79528; -77.44056
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1482:. You can help by
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113:interlanguage link
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1337:Surge chamber
1334:
1333:
1330:
1327:
1324:
1321:
1318:
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1309:
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968:
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749:
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739:
734:
729:
681:
678:
661:
658:
629:James Bay Road
627:Main article:
624:
621:
584:
581:
542:Main article:
539:
536:
507:system of the
452:
451:
432:
431:
426:(110,000
420:
414:
413:
410:
404:
403:
397:
391:
390:
380:
374:
373:
370:
368:Hydraulic head
364:
363:
359:
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343:
342:
337:
333:
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322:(621,538
316:
312:
311:
308:
304:
303:
300:
296:
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288:
287:
282:
278:
277:
275:Embankment dam
272:
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119:
97:
94:
82:adding a topic
77:
66:
59:
40:
39:
38:
36:
29:
15:
13:
10:
9:
6:
4:
3:
2:
2129:
2118:
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2110:
2108:
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2100:
2098:
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2077:
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2069:
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2064:
2062:
2059:
2057:
2054:
2052:
2049:
2047:
2044:
2042:
2039:
2037:
2036:La Grande-2-A
2034:
2032:
2029:
2027:
2024:
2023:
2020:
2016:
2009:
2004:
2002:
1997:
1995:
1990:
1989:
1986:
1980:
1977:
1976:
1972:
1966:
1964:2-89111-502-3
1960:
1956:
1951:
1947:
1945:2-89310-010-4
1941:
1937:
1933:
1929:
1925:
1923:2-89111-109-5
1919:
1915:
1914:
1908:
1904:
1902:2-89111-829-4
1898:
1893:
1892:
1885:
1882:
1877:
1875:2-89111-388-8
1871:
1867:
1862:
1861:
1857:
1849:
1848:
1843:
1837:
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1830:
1825:
1822:
1818:
1813:
1810:
1806:
1801:
1798:
1794:
1789:
1786:
1782:
1781:0-7747-3029-3
1778:
1774:
1768:
1765:
1762:, p. 117
1761:
1756:
1754:
1750:
1747:, p. 111
1746:
1741:
1738:
1735:, p. 263
1734:
1729:
1726:
1722:
1717:
1714:
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1668:
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1571:
1566:
1563:
1562:Canada portal
1552:
1545:
1536:
1531:
1524:
1519:
1512:
1507:
1502:
1494:
1485:
1481:
1478:This section
1476:
1473:
1469:
1468:
1464:
1457:La Grande-2-A
1456:
1450:
1447:
1445:
1442:
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1108:
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1101:
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1094:
1092:
1088:
1084:
1079:
1077:
1072:
1070:
1069:surge chamber
1065:
1063:
1062:René Lévesque
1059:
1055:
1047:
1045:
1041:
1039:
1035:
1031:
1022:
1015:
1013:
1009:
1002:
1000:
996:
994:
991:and the EOL (
990:
986:
982:
973:
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934:
931:
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926:
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844:
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815:
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797:
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790:
786:
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762:
759:
757:
756:
727:
726:
720:
716:
714:
709:
707:
703:
699:
695:
686:
680:Dam and dykes
679:
677:
675:
670:
666:
659:
657:
653:
651:
646:
644:
635:
630:
622:
620:
618:
613:
608:
606:
601:
599:
595:
591:
582:
580:
578:
573:
569:
567:
566:René Lévesque
563:
559:
555:
554:hydroelectric
551:
545:
537:
535:
533:
529:
524:
522:
518:
514:
510:
506:
502:
498:
493:
491:
487:
483:
479:
475:
471:
470:hydroelectric
467:
463:
459:
449:
448:2-550-41276-1
445:
441:
433:
429:
425:
421:
419:
415:
411:
409:
405:
402:
398:
396:
392:
389:
385:
381:
379:
375:
371:
369:
365:
362:Power Station
360:
356:
352:
348:
344:
341:
338:
334:
329:
325:
321:
317:
313:
309:
305:
301:
297:
293:
289:
286:
283:
279:
276:
273:
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267:
262:
259:
256:
252:
248:
244:
240:
236:
232:
228:
223:
195:
191:
188:
184:
180:
177:
173:
169:
167:Official name
165:
161:
156:
151:
135:
131:
128:
120:
114:
110:
106:
102:
98:
95:
88:
87:main category
84:
83:
78:
75:
71:
67:
64:
61:
60:
54:
48:
46:
41:You can help
37:
28:
27:
22:
2071:Eastmain-1-A
2030:
1954:
1935:
1912:
1890:
1880:
1865:
1845:
1836:
1829:Lacasse 1983
1824:
1819:, p. 58
1812:
1805:Lacasse 1983
1800:
1795:, p. 54
1788:
1772:
1767:
1745:Turgeon 1992
1740:
1728:
1716:
1705:. Retrieved
1700:
1691:
1681:, retrieved
1665:
1658:
1648:, retrieved
1638:
1576:Water portal
1488:
1484:adding to it
1479:
1448:
1443:
1438:
1433:
1428:
1423:
1418:
1413:
1408:
1179:Water crane
1095:
1080:
1073:
1066:
1053:
1051:
1042:
1033:
1032:, nicknamed
1027:
1010:
1006:
997:
978:
950:191,400,000
932:
927:426,000,000
892:405,500,000
857:927,900,000
822:927,900,000
717:
710:
691:
674:outlet works
671:
667:
663:
654:
647:
640:
609:
602:
598:Duncan dykes
597:
593:
586:
583:Construction
574:
570:
547:
525:
496:
494:
478:Hydro-Québec
465:
461:
457:
455:
422:31,000
324:cu ft/s
318:17,600
258:Hydro-Québec
109:edit summary
100:
80:
50:
42:
2046:La Grande-4
2041:La Grande-3
2026:La Grande-1
1858:Works cited
1721:Bolduc 2000
1703:(in French)
1429:144,967,000
1374:48,000,000
1368:21,500,000
1345:13,100,000
1332:13,120,000
1320:16,000,000
1295:19,000,000
1289:14,700,000
1170:19,500,000
1119:excavation
1114:excavation
953:49,826,000
924:12,070,000
921:66,500,000
889:11,482,000
886:76,800,000
854:26,274,000
851:48,100,000
819:26,274,000
816:48,100,000
605:underground
462:La Grande-2
217: /
193:Coordinates
52:(July 2011)
2091:Categories
2066:Eastmain-1
1707:2024-02-28
1683:2012-09-12
1650:2010-08-21
1621:References
1449:27,337,000
1444:12,400,000
1439:10,630,000
1419:43,720,000
1399:6,300,000
1393:4,000,000
1371:1,370,000
1357:1,210,000
1329:5,951,000
1326:4,500,000
1307:1,567,000
1266:6,200,000
1237:3,600,000
1224:2,120,000
1218:1,900,000
1212:6,700,000
1204:Penstocks
1199:9,300,000
1196:4,200,000
1193:2,880,000
1187:6,500,000
1164:2,800,000
981:Luxembourg
947:5,421,000
918:1,884,000
883:2,176,000
848:1,361,000
813:1,361,000
746:Excavation
552:, a large
205:77°26′26″W
202:53°47′43″N
179:Baie-James
2056:Laforge-2
2051:Laforge-1
1424:4,105,000
1414:1,238,000
1387:Tailrace
1122:Concrete
1109:Facility
1058:megawatts
967:Reservoir
827:Main dam
501:reservoir
382:16 Ă— 351
331:Reservoir
127:talk page
79:Consider
47:in French
2076:Sarcelle
1934:(1987),
1674:archived
1644:archived
1546:See also
1396:179,000
1390:114,000
1365:608,000
1354:550,000
1351:420,000
1342:371,000
1323:127,000
1317:454,000
1304:711,000
1301:670,000
1292:530,000
1286:417,000
1263:175,000
1260:740,000
1243:120,000
1234:101,000
1221:960,000
1209:190,000
1184:183,000
1167:552,000
1030:spillway
1016:Spillway
993:Eastmain
741:Min. top
650:ice road
643:Matagami
612:sabotage
530:who, as
468:), is a
436:Sources:
378:Turbines
281:Impounds
254:Owner(s)
175:Location
103:provide
1847:YouTube
1434:301,000
1380:18,000
1348:12,000
1298:19,000
1272:88,000
1257:21,000
1249:55,000
1246:25,000
1215:55,000
1190:81,500
1161:78,000
1038:winches
940:91,772
937:27,972
903:44,865
900:13,675
868:29,587
798:17,316
753:volume
748:volume
738:height
733:length
702:ice age
698:moraine
538:Context
336:Creates
125:to the
107:in the
49:.
2061:Brisay
1961:
1942:
1920:
1899:
1872:
1779:
1503:Photos
1278:6,600
1275:3,000
1269:2,500
1240:3,500
1125:Steel
987:, the
956:1.7596
865:9,018
833:9,304
830:2,836
795:5,278
743:width
706:riprap
486:Canada
446:
399:5,616
299:Length
291:Height
187:Canada
183:Quebec
1677:(PDF)
1670:(PDF)
1409:Total
1254:Adit
933:Total
731:Crest
728:Type
590:dykes
577:silty
70:DeepL
1959:ISBN
1940:ISBN
1918:ISBN
1897:ISBN
1870:ISBN
1777:ISBN
1377:500
1117:Rock
1112:Soil
1052:The
1028:The
912:7.6
909:171
877:7.6
874:217
839:531
836:162
804:160
751:Fill
736:Max.
623:Road
503:and
466:LG-2
456:The
444:ISBN
241:1981
233:1974
101:must
99:You
63:View
1486:.
1153:lb
1150:kg
1147:ft
1141:ft
1135:ft
960:10
915:25
906:52
880:25
871:66
845:30
810:26
801:50
787:ft
781:ft
775:ft
769:ft
763:ft
505:dam
484:in
480:'s
424:GWh
412:63%
320:m/s
72:or
2093::
1844:.
1752:^
1699:.
1672:,
1628:^
1144:m
1138:m
1132:m
1064:.
842:9
807:8
784:m
778:m
772:m
766:m
760:m
619:.
523:.
490:MW
438:*
428:TJ
401:MW
384:MW
185:,
181:,
2007:e
2000:t
1993:v
1968:.
1949:.
1927:.
1906:.
1883:)
1850:.
1710:.
1493:)
1489:(
958:Ă—
464:(
430:)
326:)
136:.
129:.
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
