NAGARJUNASAGAR PROJECT

NAGARJUNASAGAR PROJECT IMPORTANCE & SALIENT FEATURES

Biggest masonry dam in the country

Foundation Stone : 10-12-1955

Release of water into Canals : 04-08-1967

Localized ayacut : 8.73 lakh ha.

Contemplated ayacut : 8.95 lakh ha.

Length of Masonry Dam : 1449.628 Mts. (4756 ft.)

Height of Dam : 124.663 Mts. (409 ft.)

Length of Right Earth Dam : 853.440 Mts. (2800 ft.)

Length of Left Earth Dam : 2560.320 Mts. (8400 ft.)

Catchment Area at Dam Site : 2,15,185 Sq. Kms(83,083 Sq Miles)

Maximum observed flood occurred on 7.10.1903 : 30,050 Cumec (10.61 lakh cusec)

Maximum flood recorded after construction of NS Dam : 25,745 Cumec (9.09 lakh cusec)

15.10.1998

SALIENT FEATURES

DAM

SALIENT FEATURES RESERVOIR

Gross Capacity(at F.R.L.) : 408.240 TMC

Live Capacity above minimum draw down level (+ 510 ft.) : 202.470 TMC

Water spread area : 110 Sq. Miles (285 Sq Kms.)

Dead Storage Level : + 400.00 ft. (121.920 Mtrs.)

Full Reservoir Level : + 590.00 ft. (179.832 Mtrs.)

SALIENT FEATURES

CANALS

Jawahar Canal (Right Bank) : 203 KM - 126 Miles

Length of Branch Canal and distributaries (Rt. Bank) : 5342 KM - 3320

Miles

Lal Bahadur Canal (Left Bank) including 21st main branch canal : 295 KM - 183 Miles. Length of Branch Canal and distributaries (Left Bank) : 7722 KM - 4800 Miles

SALIENT FEATURES

POWER GENERATION

Main Power House : 810 M.W.

Right Bank Canal Power House : 90 M.W.

Left Bank Canal Power House : 60 M.W.

CHRONOLOGY

Year 1903: First conception of a project on Krishna River. Year 1930: Preparation of first preliminary project report at the present

dam site at the Irrigation in Hyderabad state. 01-04-1954: Preparation of Nandikonda Project report 17-06-1955: Administrative approval to preliminary works. 01-08-1955: Commencement of construction of approach road to dam

site. 10-12-1955: Laying of foundation stone for the project by Pandit

Jawaharlal Nehru, Prime Minister of India. 10-02-1956: Completion of Masonry Coffer Dam. 11-10-1956: Inauguration of Right Canal Excavation by Sri N.Sanjeeva

Reddy, Deputy Chief Minister, Andhra State. 12-07-1957: Commencement of Masonry for Dam. 13-02-1958: CWPC presented detailed designs, drawings and

specifications for NS Dam and appurtenant works

CHRONOLOGY

9-09-1959: Inaguration of Left Canal Tunnel work. Year 1960: Committee on Plan projects team recommended changes in

the design features of the project. Sep’1960: The Government of India cleared the project estimate. May 1967: Spillway of the dam brought to the crest level(546.00 ft) 04-08-1967: Smt Indira Gandhi, Prime Minister released water into

canals. 15-05-1968: Laying the last masonry stone of the dam. Masonry dam

completed. Year 1974: Erection of crest gates completed. 17-10-1974: The reservoir was first filled upto FRL+590.00 ft 10-07-1978: Dedication of Power unit to the nation. 25-02-1983: Jawahar Canal power house brought into operation. 28-09-1992: Dedication of Lal Bahadur canal power units.

Project Estimate & Expenditure

Planning commission approved the NS project in 1960 for Rs 91.12 crore. The Expenditure incurred upto Oct’2008 is Rs 1248.46 crore. World Bank aid received to complete the balance works as on 1976 to an amount

of Rs 130.50 crore. World Bank loan closed during 1985.

Stage of Ayacut development after World Bank aid 1985

Contemplated ayacut under Jawahar Canal : 4.75 Lakh Ha Ayacut developed under Jawahar Canal : 4.5325 Lakh Ha Balance ayacut to be developed : 0.2175 Lakh Ha An ayacut of 0.2023 Lakh acres is in Tobacco grown area. The Government excluded this

ayacut from N.S.P on the request of ryots.

Contemplated ayacut under Lal Bahadur Canal : 4.20 Lakh Ha Ayacut developed under Lal Bahadur Canal : 3.935 Lakh Ha Balance ayacut to be developed : 0.265 Lakh Ha

AIBP Programme under NSP – 1998 - 2005

Central loan assistance sanctioned during1998=Rs. 85.50 Crores Expenditure incurred =Rs.91.70 Crores AIBP closed during the year 2005 IP created under AIBP =25,070 Ha

Stage of Ayacut Development after AIBP Contemplated ayacut under Jawahar canal =4.75Lakh Ha Ayacut Developed under Jawahar canal =4.5477Lakh Ha Balanced ayacut under Jawahar canal =0.2023Lakh Ha The ryots under Tobacco grown area again requested during 2008

to tag this area under N.S.P. It is proposed to develop an ayacut of 0.2023 Lakh acres under Andhra Pradesh Water Sector Improvement Project.

Contemplated ayacut under Lal Bahadur canal =4.20 Lakh Ha Ayacut developed under Lal Bahadur canal =4.172Lakh Ha Balanced ayacut to be developed =0.028Lakhs Ha

Andhra Pradesh Economic Restructuring Project

Minimum rehabilitation works, Recurring Maintenance works and System Improvement and Farmers Turnover works were taken up under APERP during the period from 1998-2006.

Expenditure incurred under APERP : Rs 204.63 crore

After 2006 maintenance works under NSP are being taken up from the Plough Back amount.

Deferred maintenance works are being taken up from the Normal state plan budget.

No central assistance for O&M of the project is received so far.

BALANCE AYACUT TO BE DEVELOPED

Contemplated ayacut under Jawahar Canal : 4.75 Lakh Ha Ayacut developed under Jawahar Canal : 4.5477 lakh Ha Balance ayacut to be developed : 0.2023 lakh Ha

The balance ayacut under Jawahar canal is proposed to develop under Modernisation of NSP.

Contemplated ayacut under Lal Bahadur Canal: 4.20 Lakh Ha Ayacut developed under Lal Bahadur Canal : 4.172 lakh Ha Balance I.P to be created : 0.028 lakh Ha Ayacut overlapped under Polavaram project : 0.027 lakh Ha Balance ayacut to be developed under

Lal Bahadur canal : 0.001 lakh HaNS Project can be declared as completed Project after development of above balance ayacut.

Map showing balance ayacut (in yellow colour) under Lal Bahadur canal after AIBP

Andhra Pradesh Water Sector Improvement Project

Objectives of APWSIP: To improve Irrigation service delivery on sustainable basis To increase the productivity of the Irrigated agriculture. To strengthen the states institutional capacity for multi-sector planning, development and management of its water resources. The ayacut in Tobacco exclusion zone under Jawahar canal to an

extent of 23000 ha is proposed to develop under Andhra Pradesh Water Sector Improvement Project (APWSIP).

Cost of APWSIP: Complete rehabilitation & Modernisation of APWSIP assessed at

Rs 4444.41 crore. Share already agreed by the World Bank : Rs 2025.00 crore State’s share from the state plan : Rs 2419.41 crore.

Stage of Works under APWSIP

Works on both Main canals and Branch canals were commenced in May 2008.

Dam safety works will be commenced in 2009. Works on distributory network system will be commenced in 2009. The project is planned to complete in a span of six years commencing

from 2008.

NAGARJUNA SAGAR RIGHT MAIN CANAL

NAGARJUNA SAGAR LEFT MAIN CANAL

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