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  • BUMBUNA HYDROELECTRIC PROJECT, SIERRA LEONE

    1ST MEETING OF THE DAM REVIEW PANEL

    25 OCTOBER TO 4 NOVEMBER 2004

    R E P O R T

    0417/Report/Bumbuna Final Report.doc

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    Administrator E1093 V. 4

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    TABLE OF CONTENTS

    EXECUTIVE SUMMARY ............................................................................................................................ 7

    1. BACKGROUND PROJECT INFORMATION..................................................................................... 7

    2. IMPLEMENTATION ACTIVITIES ..................................................................................................... 7

    3. DAM REVIEW PANEL (DRP). FIRST MEETING ACTIVITIES ...................................................... 8

    4. GENERAL QUALITY ASSESSMENT OF THE PROJECT ............................................................... 9

    5. BASIC SITE INVESTIGATIONS AND BASIC STUDIES................................................................. 9

    6. REHABILITATION AND COMPLETION OF CIVIL WORKS......................................................... 9

    7. REHABILITATION OF EQUIPMENT AND INSTALLATIONS .................................................... 10

    8. FIRST IMPOUNDMENT AND RESERVOIR OPERATION............................................................ 10

    9. OPERATION AND MAINTENANCE ............................................................................................... 11

    10. FURTHER DRP ACTIVITIES............................................................................................................ 11

    1. INTRODUCTION ............................................................................................................................... 12

    1.1. DRP Members .............................................................................................................................. 12

    1.2. Terms of Reference ...................................................................................................................... 12

    1.3. DRP Itinerary and Activities ........................................................................................................ 15

    1.4. Documents Submitted to the DRP................................................................................................ 15

    1.5. Report Organization ..................................................................................................................... 16

    2. BACKGROUND ................................................................................................................................. 16

    2.1. 1970 to 1975 – Preliminary Studies.............................................................................................. 16

    2.2. 1980 - Feasibility Study............................................................................................................... 16

    2.3. 1981 - Tender Documents for Phase I .......................................................................................... 16

    2.4. 1982 – Updating of Prices and Economic Analysis...................................................................... 16

    2.5. 1983 – Completion of Tender Documents for Phase I................................................................. 17

    2.6. 1984 – Supplemental Feasibility Study for Scaled Down Solution.............................................. 17

    2.7. 1982 – 1985 – Construction Works under Contracts A0 and A1 ................................................. 17

    2.8. 1988 – 1989 – Signature of Contracts A2 and B and Financial Convention with Italian Government .................................................................................................................................. 17

    2.9. 1991 – Signature of Financing Agreements with ADB ................................................................ 17

    2.10. 1991 – 1993 Construction Under Contract A2 and B................................................................... 17

    2.11. 1993 – Signature of Contracts C and D ........................................................................................ 18

    2.12. 1993 – Final Design and Budget for Completion of Contracts A2 and B .................................... 18

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    2.13. 1993 – Cancellation by Italian Government of Sierra Leone’s Debts .......................................... 18

    2.14. 1993 – Suspension of Work on Contracts A2 and B. ................................................................... 18

    2.15. 1995 – Signed Loan Agreement to Complete Contracts A2 and B .............................................. 18

    2.16. 1996 – 1997 - Resumption of Work Under Contracts A2, B, and continuation of D. .................. 18

    2.17. 1997 – Construction Activities Under Contracts A2 and B Suspended Due to Civil Unrest. ...... 18

    3. PROJECT DESCRIPTION.................................................................................................................. 18

    3.1. Asphalt Concrete Faced Rockfill Dam ......................................................................................... 18

    3.2. Reservoir....................................................................................................................................... 19

    3.3. Multipurpose Tunnels................................................................................................................... 19

    3.4. Spillways ...................................................................................................................................... 19

    3.5. Intake ............................................................................................................................................ 20

    3.6. Power House and Control Building .............................................................................................. 20

    3.7. Electro-Mechanical Equipment .................................................................................................... 20

    3.7.1 Turbines and Generators....................................................................................................... 20

    3.7.2 Transformers......................................................................................................................... 20

    3.7.3 Switchgear ............................................................................................................................ 20

    3.7.4 Low Voltage Service Installations ........................................................................................ 21

    3.7.5 Control, Protection, Instrumentation and Metering Equipment........................................... 21

    3.7.6 Ancillary Equipment and Services ....................................................................................... 21

    3.8. Transmission Line ........................................................................................................................ 21

    4. PLANNING AND INVESTIGATION................................................................................................ 21

    4.1. Preliminary Studies....................................................................................................................... 21

    4.2. Feasibility Study 1980 .................................................................................................................. 22

    4.2.1 Design Flood......................................................................................................................... 22

    4.2.1.1 1980 Feasibility Report..................................................................................................... 22

    4.2.1.2 Memorandum on PMF, March 31, 1994 .......................................................................... 23

    4.2.1.3 Reservoir Routing and Spillway Sizing............................................................................ 23

    4.2.1.4 Review Comments............................................................................................................ 24

    4.2.2 Power Generation ................................................................................................................. 25

    4.2.2.1 July 1980 Feasibility Study............................................................................................... 25

    4.2.2.2 April 1994 Analysis.......................................................................................................... 25

    4.2.2.3 Review Comments............................................................................................................ 26

    4.2.3 Geotechnics .................................................................................