Shahran Sazeh|Management, Design & Implementation of Civil & Industrial Projects

• Generating 120 megawatt hydroelectric energy to electrification the deorived areas in Sri Lanka
• Water transmission, development and improvement agricultural lands in downstream the river

In may 2008 an agreement upon Uma Oya multipurpose project was signed by the presidents of Iran and Sri Lanka with a value of 525 million USD.
According to this agreement the duration of the project was predicted to be 5 years and it has started from 2010.

The wellawaya and Badulla districts in the central hill country, Bandarawela City, 200km of Colombo, Sri Lanka

Uma Oya project consists of 2 reservoir dams. A conveyance tunnel with a length of 4 km connects these two reservoirs and then the whole water is transferred trough a 15 km headrace tunnel to a 600 m high vertical pressure shaft. Water discharge is about 20 m3/s and it will rotate 2 unites of 60 megawatt turbines to produce 120 megawatt hydroelectric energy.
Access to the cavern and powerhouse is through an inclined tunnel with 13% slope, 2 km length and 50 m2 face area. The water exit from powerhouse through the 3 km tailrace tunnel and goes to the downstream areas.
The specifications of main scope of this contract is according to the following section:
• Construction of powerhouse cavern (approximate size: 18×35×67 m)
• Construction of transformer cavern and conducting tunnels to the powerhouse tunnel (approximate size: 14×13×37 m)
• Construction the access tunnel to pressure shaft
• Construction of a part of tailrace tunnel
• Construction of other connecting tunnels
• Evacuation the materials from excavation in pressure shaft

فارسی

Uma Oya Underground Power Plant

Project Organization

General volumes

General Layout

Video

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