NAGARJUNA SAGAR
Preamble

Nagarjunasagar Project is the largest and highest masonry dam in the world built between Nalgonda district of Telangana and Guntur district of Andhra Pradesh.The Project was inaugurated on 10th December 1955 by Late Pandit Jawaharlal Nehru, the then Prime Minister of India .

Salient Features
Latitude : 16 34' 23" N
Longitude : 79 18' 47" E
Catchment area at Dam site : 83,083 Sq.miles (2,15,185 Sq.KMs)
Maximum annual rain fall in the Catchment : 35" (889 MM)
Maximum observed flood : 30,050 cumecs (10.61 Lakh C/s)
1000 years design flood : 58,340 cumecs (20.60 Lakh C/S)
Routed flood : 45310 Cumecs (16.00 Lakh C/S)
RESERVOIR DETAILS
F.R.L : +590.00 Ft. (+179.832 Mt.)
Maximum water level : +594.00 Ft. (+181.051 Mt.)
M.D.D.L : +510.00 Ft. (+155.450 Mt.)
Water spread area : 110 Sq.Miles (285 Sq.KMs)
Live storage above +510.00 Ft. : 181 TMC
MASONRY DAM DETAILS
Length of spill way Dam : 1545 Ft. (470.916 Mts.)
Length of Non-over flow Dam : 3211 Ft. (978.612 Mts.)
Total length of Masonry Dam : 4756 Ft. (1449.628 Mts)
Maximum height of Dam above deepest Foundation : 409 Ft. (124.663 Mts.)
Top width of Dam : 28 Ft. (8.534 Mts.)
Maximum base width of Dam : 320 Ft. (97.536 Mts.)
Over-all width of road way at top : 30 Ft. 9 inch. (9.373 Mts)
Deepest foundation level : +196.00 Ft. (+59.741 Mts)
Average river bed level : +245.00 Ft.(+74.676 Mts.)
Spillway crest level : +546.00 Ft. (+166.421 Mts.)
Top of crest gates : +590.00 Ft.(+179.832 Mts.)
Top of Dam : +605.00 Ft. (184.404 Mts.)
Invert level of flip bucket : +240.00 Ft. (73.15 Mts.)
Crest gates : 26 Nos. of size 45' x 44' (13.716 x 13.410m)
Chute sluices : 2 vents of size 10' x 25' with sill at +450' (137.16 Mts), Operable upto +549.00 Ft Discharging 17,000 C/S at full gate opening.
Diversion Tunnel : 2 Vents of size 10' x 25', Operable upto +560.00 Ft, Discharging 20,000 C/S at full gate Opening.
Right Canal Head sluice : 9 vents of size 10' x 15' with sill At +489' (149.047 Mt.)
Left Canal Head sluice : 3 vents of size 10' x 25' with sill At +489' (149.047 Mt.)
EARTH DAM DETAILS:
Length of Left Earth Dam : 8400 Ft. (2560.32 Mts.)
Length of Right Earth Dam : 2800 Ft. (853.44 Mts.)
Total Length : 11,200 Ft. (3413.76 Mts.)
Maximum height : 85 Ft(25.908 Mts.)
Top width : 30 Ft. 6" (9.296 Mts.)
Top level : +610 Ft. (+185.928 Mts.)
POWER GENERATION:
Penstocks ( 8 numbers) : 16.00 Ft. dia (4.88 Mts)
Centre line elevation : +405.00 ft.(+123.40 Mts.)
Main Power House :
1 no conventional : 110 MW capacity,Discharging capacity 4,700 C/s
7 Nos. reversible : 100MW capacity,Discharging capacity:4,300 C/S
Right Canal Power House: : Three Units-30MW each
Left Canal Power House : : Two Units-30MW each
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