Kaptai Dam

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Kaptai Dam (Bengali: কাপ্তাই বাঁধ) is on the Karnaphuli River at Kaptai, 65 km (40 mi) upstream from Chittagong in Rangamati District, Bangladesh. It is an earth-fill embankment dam with a reservoir (known as Kaptai Lake) with water storage capacity of 6,477 million cubic metres (5,251,000 acre⋅ft). The primary purpose of the dam and reservoir was to generate hydroelectric power. Construction was completed in 1962, in then-East Pakistan. The generators in the 230 MW (310,000 hp) Karnafuli Hydroelectric Power Station were commissioned between 1962 and 1988.[1] It is the only hydroelectric power station in Bangladesh.[2]

Kaptai Dam
The dam in 2023
Kaptai Dam is located in Bangladesh
Kaptai Dam
Location of Kaptai Dam in Bangladesh
CountryBangladesh
LocationKaptai, Rangamati District
Coordinates22°29′42″N 92°13′30″E / 22.49500°N 92.22500°E / 22.49500; 92.22500
PurposePower
StatusOperational
Construction began1957
Opening date1962
Dam and spillways
Type of damEmbankment
ImpoundsKarnaphuli River
Height45.7 m (150 ft)
Length670.6 m (2,200 ft)
Width (crest)7.6 m (25 ft)
Width (base)45.7 m (150 ft)
Dam volume1,977,000 m3 (69,800,000 cu ft)
Spillway typeControlled, 16 gates
Spillway capacity16,000 m3/s (570,000 cu ft/s)
Reservoir
CreatesKaptai Lake
Total capacity6,477,000,000 m3 (5,251,000 acre⋅ft)
Catchment area11,000 km2 (4,200 sq mi)
Surface area777 km2 (300 sq mi)
Normal elevation33 m (108 ft)
Power Station
Commission date1962, 1982, 1988
Turbines2 x 40 MW (54,000 hp), 3 x 50 MW (67,000 hp) Kaplan-type
Installed capacity230 MW (310,000 hp)

History

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Kaptai dam being visited by president Ayub Khan
 
Kaptai Dam in 1965

A brief reconnaissance occurred in 1906 when the Karnafuli Hydropower Station was first contemplated. A second study was carried out in 1923. In 1946, E. A. Moore recommended the proposed project at Barkal about 65 kilometers upstream of the present dam site at Kaptai. In 1950, the Marz Rendal Vatten Consulting Engineers suggested a site at Chilardak, about 45 kilometers upstream of Kaptai.

In 1951, the government engineers proposed Chitmoram, 11 km (6.8 mi) downstream of the present site. Under the guidance of the chief engineer (Irrigation) Khwaja Azimuddin, the construction site was chosen in 1951. Utah International Inc. was selected as a construction contractor. Construction of the dam started in 1957 and was completed in 1962 during the era of President Muhammad Ayub Khan.

Construction

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Starting in 1957, the initial phase of the construction was completed in 1962. By this time the dam, spillway, penstock, and two 40 MW Kaplan turbine generators were built in the power station. In August 1982 a 50 MW generator was commissioned. In October 1988 the fourth and fifth generating units, both 50 MW Kaplan-type turbines, were installed which raised the total generation capacity to 230 MW.[3]

The total cost of Unit 1, Unit 2, and a part of Unit 3 was Rs. 503 million and the total cost of extension was Tk. 1,900  million. The project was financed by the East Pakistan Government (at the time), the United States, and the Overseas Economic Cooperation Fund.[3][1]

Description

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Boat on Kaptai Lake

The earthen dam is 670 m (2,200 ft) long and 45.7 m (150 ft) wide with a 16-gate spillway on the left side.[1] The construction of the dam submerged 655 km2 (253 sq mi) area. This included 220 km2 (85 sq mi) of cultivable land, 40 percent of the cultivable land in the area, and displaced 18,000 families and 100,000 tribal people, of which 70% were Chakma. The dam flooded the original Rangamati town and other structures.[4]


Social and ecological effects

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Inhabitants of the storage reservoir area who lost their homes and farmland due to flooding were not compensated. More than 40,000 Chakma tribals emigrated to Arunachal Pradesh,[5] India.[6] The scarcity of land is considered a main cause of the continuing conflict in the area.[4]

The building of the dam and reservoir also caused the destruction of wilderness and the loss of wildlife and wildlife habitats.[1]

Notes

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  1. ^ a b c d Bari, M Fazlul (2012). "Dam". In Islam, Sirajul; Jamal, Ahmed A. (eds.). Banglapedia: National Encyclopedia of Bangladesh (Second ed.). Asiatic Society of Bangladesh. Archived from the original on 7 January 2016. Retrieved 11 November 2015.
  2. ^ Saila Parveen, I. M. Faisal (21 July 2010). "People versus Power: The Geopolitics of Kaptai Dam in Bangladesh". International Journal of Water Resources Development. 18: 197–208. doi:10.1080/07900620220121756. S2CID 154589647.
  3. ^ a b "Power Plants" (PDF). Bangladesh Power Development Board. March 2010. Archived (PDF) from the original on 26 May 2012. Retrieved 15 March 2013.
  4. ^ a b "The construction of the Kaptai dam uproots the indigenous population (1957–1963)". Internal Displacement Monitoring Centre. Archived from the original on 27 September 2007. Retrieved 1 February 2007.
  5. ^ Chakravarty, Ipsita. "50 years on, Chakma refugees from Bangladesh are still denied citizenship rights in Arunachal". Scroll.in. Archived from the original on 27 January 2019. Retrieved 27 January 2019.
  6. ^ "How Chakmas and Hajongs settled in North East, why Arunachal worries about citizenship". The Indian Express. 20 September 2017. Archived from the original on 21 September 2017. Retrieved 21 September 2017.
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