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Abstract: Uma Oya Multipurpose Development Project is in Sri Lanka. This project involves 2 RCC Dams connected by a Link tunnel constructed by D&B method. The water will be transferred from the first dam to the 2nd dam and then it will be transferred through a long 15.4 Km Headrace tunnel to the top of a 618 m deep pressure shaft that feeds the high-pressure water to an underground powerhouse for a...