Mantasoa Dam is a buttress dam on the Varahina-North River, a tributary of the Ikopa River, near Mantasoa in the Analamanga Region of Madagascar. The dam was constructed by French contractors between 1937 and 1938. It creates Lake Mantasoa which has a surface area of 20 km² (7.7 sq mi). The dam itself is made of 8,000 m³ (10,000 cu yd) of concrete and has a reinforced buttress design.[1] Water released from the dam supplies a regulated flow to hydroelectric power station at the Antelomita Dams downstream. A saddle dam on the north side of the Mantosoa reservoir regulates water flow into the Mandraka River for the Mandraka Dam downstream.[2][3]

Mantasoa Dam
Location of Mantasoa Dam in Madagascar
Country	Madagascar
Location	Mantasoa, Analamanga Region
Coordinates	19°01′04.39″S 47°50′59.43″E
Purpose	Power, water supply
Status	Operational
Construction began	1937
Opening date	1938; 84 years ago (1938)
Owner(s)	Jirama
Dam and spillways
Type of dam	Buttress
Impounds	Varahina-North River
Height	20 m (66 ft)
Length	122 m (400 ft)
Reservoir
Creates	Lake Mantasoa
Total capacity	125,000,000 m3 (101,000 acre⋅ft)
Surface area	20 km2 (7.7 sq mi)

See also

• Tsiazompaniry Dam – on the Varahina South River

References