Uma Oya Multipurpose Development Project

The Uma Oya Multi-Purpose Development Project (UOMDP) consists of the construction of two dams across two main tributaries of Uma Oya at Welimada and Dyraba and in a 23km long trans-basin diversion tunnels with an underground power station at Randeniya. The objectives are the generation of hydropower, irrigation, provision of drinking water and of water for industrial activities. In particular, the major concern is to provide water for the second International Airport in Hambanthota, the Industrial Zone of Hambanthota, the Hambanthota Harbour and the Oil Refinery.
The project consisted in the excavation with hard rock doubleshield Herrenknecht of a 12km tunnel