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  Water Transmission Tunnel Rehabilitation in Thailand

  Metropolitan Waterworks Authority (MWA) intended to improve the existing transmission tunnel of various sections with the diameters varies from 2.0 m to 2.8 m and the total length of 14 km approximately, which was constructed more than 30 years. The existing water transmission tunnel mentioned above has been suffered from the leakage in the entire tunnel section due to insufficiency of water tightness of the reinforced concrete (RC) secondary lining and construction joints. This has caused the Authority to reduce water delivery capacity of the transmission tunnel in order to maintain the transmission flow under minimizing leakage as much as possible, therefore the tunnel has not been fully utilized its capacity.

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