Tsiazompaniry Dam

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Tsiazompaniry Dam
Madagascar physical map.svg
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Location of Tsiazompaniry Dam in Madagascar
Location Tsiazompaniry, Analamanga Region
Coordinates 19°15′16.68″S47°50′44.56″E / 19.2546333°S 47.8457111°E / -19.2546333; 47.8457111 Coordinates: 19°15′16.68″S47°50′44.56″E / 19.2546333°S 47.8457111°E / -19.2546333; 47.8457111
PurposePower, water supply
Opening date1956;63 years ago (1956)
Owner(s) Jirama
Dam and spillways
Type of dam Buttress
Impounds Varahina-South River
Height27 m (89 ft)
Total capacity260,000,000 m3 (210,000 acre⋅ft)
Surface area31 km2 (12 sq mi)

The Tsiazompaniry Dam is a buttress dam on the Varahina-South River, a tributary of the Ikopa River, near Tsiazompaniry in the Analamanga Region of Madagascar. The dam was constructed by a French firm in 1956. It creates Lake Tsiazompaniry, the largest reservoir in the country, which has a surface area of 31 km2 (12 sq mi) and a storage volume of 260,000,000 m3 (210,000 acre⋅ft). A second buttress dam, 1 km (0.62 mi) northwest of the main dam helps withhold the reservoir. Water released from the dam supplies a regulated flow to hydroelectric power station at the Antelomita Dam downstream. [1] [2] Efforts to install a 5.25 MW power station at the base of the dam began in 2011. [3]

Buttress dam dam with a solid, water-tight upstream side that is supported at intervals on the downstream side by a series of buttresses or supports

A buttress dam or hollow dam is a dam with a solid, water-tight upstream side that is supported at intervals on the downstream side by a series of buttresses or supports. The dam wall may be straight or curved. Most buttress dams are made of reinforced concrete and are heavy, pushing the dam into the ground. Water pushes against the dam, but the buttresses are inflexible and prevent the dam from falling over.The Buttress dam does however, run into certain problems that are not as prevalent in other dams. Even though they tend to be more economical they run the risk of not reaching the proper height required to become effective. An example would be as follows with a slope of 50 degrees the crown of each arch will have to be 0.84 feet farther forward at the crest than at the base for each foot of height. This defect will demand that the dam is either much taller than calculated or a lot wider to accommodate for the problem. Another issue is that the dam has to have a proper foundation of bedrock or other suitable material. If the buttresses for the dam are not properly seated the dam runs the chances of a possible collapse. Some problems that might occur during the construction of a buttress dam is cracks along the convex side near the cresting of the dam due to thermal stresses and the dam not being 'loaded'. Once the dam has been reinforced if cracks continue to occur the cracks will close once the force of the water is against it.

Ikopa River river in Madagascar

The Ikopa River is the second longest waterway in Madagascar and passes through the capital, Antananarivo. It is the largest tributary of the Betsiboka River. It is formed by the Varahina-North and Varahina-South Rivers.

Madagascar Island nation off the coast of Southeast Africa, in the Indian Ocean

Madagascar, officially the Republic of Madagascar, and previously known as the Malagasy Republic, is an island country in the Indian Ocean, approximately 400 kilometres off the coast of East Africa. The nation comprises the island of Madagascar and numerous smaller peripheral islands. Following the prehistoric breakup of the supercontinent Gondwana, Madagascar split from the Indian subcontinent around 88 million years ago, allowing native plants and animals to evolve in relative isolation. Consequently, Madagascar is a biodiversity hotspot; over 90% of its wildlife is found nowhere else on Earth. The island's diverse ecosystems and unique wildlife are threatened by the encroachment of the rapidly growing human population and other environmental threats.

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The Antelomita Hydroelectric Power Station is located in Antelomita of the Analamanga Region, Madagascar. The hydroelectric power station comprises two parts, Antelomita I and II. Both are adjacent to one another on separate water falls along the Ikopa River. Each water fall is dammed and water is diverted to the power station; each of which contains three 1.4 megawatts (1,900 hp) generators. The first two were commissioned in 1930, the second two in 1952 and the final two in 1953. Both stages have an installed capacity of 8.4 megawatts (11,300 hp). They were built by a French firm but are now owned and operated by Jirama. The Tsiazompaniry and Mantasoa Dams upstream regulate water to the power station.


  1. "Mantasoa and lake". Mantasoa. Archived from the original on 3 November 2012. Retrieved 17 March 2014.
  2. "Dams of Madagascar". UN FAO. Retrieved 17 March 2014.
  3. "ORBEO partners with Henri Fraise & Fils to develop a CDM* Hydro Power Project in Madagascar" (PDF). Orbeo. 24 March 2011. Archived from the original (PDF) on 18 March 2014. Retrieved 17 March 2014.