Tarbela Dam Project

Group Members

• Jabran Umer• Muhammad Faisal Ashraf

• Muhammad Adil• Muhammad Abdul Rehman

Contents

• History• Objectives• Project Duration• Project Constrain• Project Cost• Project life cycle• Financing• Tunnels• Spillways• Power Generation• Construction Sequence• Problems after construction• Benefits

History• In February 1960, Tippetts-Abbett-McCarthy-

Stratton of USA commonly known as TAMS, were appointed the project consultants, and were entrusted the task of investigations, preparation of detailed designs and contract documents for Tarbela Dam Project and also the supervision of construction work during its execution.

• The project consists of 9000 feet (2,743 meters) long, 470 feet (143 meters) high main dam. A power house 3478 MW five number tunnels, two spillways, auxiliary and service spillways.

Objectives

• Power Generation

• Irrigation

• Diverting three eastern rivers (Ravi, Sutlej, Beas) by India.

Project Duration

• Started in 1968

• Initial test filling 1974

• Estimated completion 7.25 year’s

• Actual completion time 8.3 years(approximately 1 year later)

Project Constrain

• Cost – 2.63 billion

• Scope– Power generation and irrigation

• Time– 8.3 year’s

Project Cost

• The total cost of project including power units (1-14) amount to US $ 2.63 billion.

Project life cycle

• Defining – Primary objective is storage of water to

overcome the effect of diverting the three eastern rivers (Ravi, Beas and Sutlej) and to increase the agricultural production.

Project life cycle

• Planning & Execution– The project was planned to have following

things essentially • A major earth and rock filled dam.• Two auxiliary earth and rock fill dam.• Two spillways.• Four outlet tunnels with 13.7m diameters.• Power station.

– Cost of project US $ 2.63 billion.

Project life cycle

• Delivery

• Detailed O&M procedures were made in 1975• Started Operating in April 1976.

Financing

• Tarbela Development Fund (TDF) in1968

• loans available from the Indus basin Development Fund and new bilateral loan agreements signed with the several countries including Australia, Canada, France, Italy, New Zealand, the United Kingdom, the United States of America and Germany

• Further extension of power house sponsored by Oil Producing and Exporting Countries (OPEC)

Tunnels

• Total number of Tunnels 4

• Length half mile

• Tunnel 1, 2, 3 for power generation and tunnel 4 for irrigation

Spillway

• Two Spillway on left bank (Service spillway auxiliary spillway)

• Spillway is flood routing structure• Spillways capacity is 1500,000 cusecs • Service spillway has 44% of total capacity• Discharge capacity of service spillway is

650,000 cusecs.• Discharge capacity of auxiliary spillway is

850,000 cusecs.

Power Generation

Four power units of 175 MW installed on each of the tunnels 1, 2, and 3.

The project has thus been enhanced from 2100 MW, as originally planned to 3478 MW.

Construction Sequence

• A contract signed for construction of civil work of Tarbela Dam Project between WAPDA and Tarbela Joint venture (TJV) including three Italian and three French heavy construction contractors.

Problems after construction

• Appearance of sink holes and cracks in the impervious blanket of the bed of river.

• Excessive seepage through the foundation.

• Erosion of the hills.

BenefitsYearRelease

s (MAF)Benefits

(Rs million)

Generation (MKWH)

Benefits (Rs. Million) @ 0.30 per

KWH

Total (Rs. Million)

1234561975-80 41.0208204.0011354.5003406.35011610.350

1980-8549.5009900.0028262.2408478.67218378.672

1985-9257.82011564.0068998.24020699.47832263.478

1992-9629.2808784.0056498.81016949.64325733.643

1996-0795.194160805.405

85674.60048241.622133916.22

Total272.814124126325919.21 97775.749221902.21