Nagarjuna sagar dam
World's largest masonary dam
Published on: Mar 3, 2016
Transcripts - Nagarjuna sagar dam
Nagarjuna Sagar Dam
Nagarjuna Sagar Dam is the world's largest
It was built on the Krishna River at Nagarjuna
Sagar in shared districts of Nalgonda
district, Telangana and Guntur district, Andhra
The construction duration of the dam was
between the years of 1955 and 1967.
Nagarjuna Sagar was the earliest in the series
of large infrastructure projects initiated for
the Green Revolution in India.
Construction began:- 10 December 1955
Opening date:- 1967
Construction cost:- 1300 crore rupees
Dam & Reservoir
Dam is Impound on Krishna River.
Height:- 124 metres
Length:- 1550 metres
It creates Nagarjuna sagar reservoir.
Total capacity:- 11,560,000,000 m3
Active capacity:- 5,440,000,000 m3
Catchment area:- 215,000 square kilometres
Surface area:- 285 km2
The proposal to construct a dam to use the
excess waters of the Krishna river was
planned by the Nizam of Hyderabad and
engaged British Engineers in 1903 to irrigate
The perseverance of the Raja Vasireddy
Ramagopala Krishna Maheswar Prasad (Raja
of Muktyala) who donated 55000 acres of his
land and fifty five million British Pounds in
wealth paved way for the site identification,
design and construction of the dam.
Effect of the project
The project benefited farmers in the districts of
Nalgonda,Guntur,Krishna,Prakasam and Kham
The right canal is known as Jawahar canal and
it is of 203 km long and irrigates 4500 square
The left canal is known as Lalbahadur Shashtri
canal and is of 293 km and irrigates 1300
square km area.
52 villages were submersed in water and
24000 people were affected.
The relocation of the people was completed by
The hydroelectric plant has a power generation
capacity of 815.6 MW with 8 units (1x110
First unit was commissioned on 7 March 1978
and 8th unit on 24 December 1985.
The right canal plant has a power generation
capacity of 90 megawatts with 3 units of30
The left canal plant has a power generation
capacity of 60 megawatts with 2 units of 30
Tapping dead storage potential
The left and right bank canals sill level is
fixed at 490 feet (150 m) MSL to supply
irrigation water to two million acres.
The unutilized storage capacity is nearly
180 TMC below the canals sill/bed level.
Nagarjuna Sagar reservoir also meets
the Krishna delta water requirements to
the extent of 100 TMC by letting water
down stream into the river.
Nearly 5,300 km2 is irrigated under
Krishna Delta Canals.
There is a possibility to utilize most of
this idle dead storage capacity to store
the river flood water further and use as
carry over storage. Nearly 150 TMC idle
storage up to 380 ft MSL, can be used
leaving 30 TMC for silt settlement. This is
possible by installing Water Powered
Pump(WPP) units at the base of the
Route of Lalbahadur canal