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Ufficio Periferico di Cagliari |
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Tarbela Dam
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Country........................................................................................................................................................... |
Pakistan |
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River............................................................................................................................................................... |
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Dam type......................................................................................................................................................... |
Zoned
earth/rockfill. On the left
bank, two auxiliary dams have been built to close saddles at the upstream end
of a side valley. The two dams have a structure similar to that of the main
dam, and are constructed with the same type of materials. On the same
left bank are also located two spillways discharging into the side valley. |
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Construction period........................................................................................................................................ |
1968-1976 |
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Structural height............................................................................................................................................. |
148 m |
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Gross storage capacity................................................................................................................................... |
Originally
14,300 Mm³. Due to silt carried by inflowing water, to the extent of 130 Mm³
per year since 1974, sedimentation has taken place, which has reduced the
gross reservoir capacity from 14,300 Mm³ to 10,500 Mm³. |
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Active storage capacity.................................................................................................................................. |
Originally
12,000 Mm³ |
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Volume of the dam.......................................................................................................................................... |
- Main
dam: 121,000,000 m³; - Auxiliary
dams: 14,000,000 and 1,500,000 m³; - Spillways:
800,000 m³ of concrete. |
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Maximum
controllable water surface............................................................................................................ |
472.44 m
a.s.l. |
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Crest elevation............................................................................................................................................... |
477.00 m
a.s.l. |
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Crest length.................................................................................................................................................... |
- Main
dam: 2.740 m; - Auxiliary
dams: 710 and 105 m. |
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Maximum discharge capacity........................................................................................................................ |
The service
spillway, with seven radial gates, has a discharge capacity of 18,400 m³/s,
while the auxiliary spillway, which has nine radial gates and a similar
structure, has a discharge capacity of 23,800 m³/s. |
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Nameplate capacity of the powerplant.......................................................................................................... |
The
powerhouse, located on the right bank just downstream of the main dam, was
completed in 1977 with four 175 MW turbine-generator sets, providing an
overall power of 700 MW. Four units, for further 700 MW, were added in 1982.
Two more units, for 350 MW in all, were completed in 1985, and finally four
other units, providing an overall power of 1,728 MW, were completed in
1992-93, making the total power generation capacity of Tarbela Dam 3,478 MW. |
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Notes............................................................................................................................................................... |
The Tarbela
Dam is the largest earth and rockfill dam of the world. Its volume of 121
million m³, largely exceeds that of other huge embankment dams, like The River |
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Ultimo aggiornamento: 4 agosto 2005