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Abstract: The 15.2km long headrace tunnel (HRT) is a key component of the Uma Oya Multipurpose Development Project (UOMDP). The HRT takes water from Dyraaba Dam to the pressure shaft that feeds the power house. The excavation of the major 4.30m diameter headrace tunnel is done by using a double shield TBM. This is the first use of a TBM in Sri Lanka. High water...