Project Name: Kayrakkum Dam and Reservoir Safety and Operation Improvement Project

Country: TAJIKISTAN

Finance Source: World Bank

Partners: Mott MacDonald

Tags: Tajikistan, World Bank, HEPP, Assessment

Detailed Narrative Description of Project:

This Project is one of the components of the Ferghana Valley Management Project of Water Resources financed by the World Bank with a budget of 13 million $. The objectives of the project include the improvement of dam and reservoir operation conditions, reduction of risks, preparation of contingency plans, detection of structural and non-structural errors, definition and classification of related risks thereof, development of risk elimination measures.

The construction works of Kayrakkum Dam had been commenced in year 1952 and its operation began in year 1959. This dam is characterized as the first hydraulic fill type dam constructed in the world. It forms an essential part of the cascade dam chains on the Syrdarya River flowing through Kyrgyzstan, Tajikistan, Uzbekistan and Kazakhstan. The dam has a height of max. 32 m, a crest length of 1202 m, a spillway discharge capacity of 3960 m3/sec., a discharge capacity of 1080 m3/sec., 6 units with an installed capacity of 126 MW, a total reservoir volume of 4700 million m3 and a reservoir surface area of 513 km2 . The power station includes two cranes with a capacity of each 250 tons, one crane of 50 tons capacity and a trashrack cleaning machine.

Works to be fulfilled within scope of the project in regard to risk assessment were classified as primary, secondary and tertiary priority works. Design and bidding documents were prepared for works of primary priority whereas preliminary designs and cost estimates were issued for works of secondary and tertiary priorities.

Detailed Description of Actual Services Provided by TEMELSU:

• Preparation of geotechnical researches and specifications of measurement devices regarding dam body and preparation of bidding documents.
• Stability and liquefaction calculations of dam body
• Control of spillway and power station discharge capacity with a probability of 1 in 10000 years and in PMF cases
• Water and hydro-economical balance studies regarding reservoir operation
• Preparation of flood area maps in case of dam breaks
• Preparation of contingency plans
• Researches of changes in water quality according to influent and effluent water analysis and the effects of sedimentation in the reservoir on flora and fauna
• Determination of current active volumes by realizing bathymetric surveys in the reservoir
• Detection and removal of defaults and deficiencies of hydro-mechanical equipment and cranes forming the basis of operation at the spillway and power station.
• Preparation of current maps for the dam body
• Determination and evaluation of damages occurred in the power station due to previous earthquakes and proposals on procedures for studies to be made in future
• Evaluation of all appurtenant structures included in the power station and preparation of bidding documents for renewal of those equipment which cause safety risks in regard to operation
• Recommendation of applicable operation methods conforming to international agreements until all risk factors at the dam are eliminated.

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