Client:
Ministry of Mahaweli Development & Environment
Location:
Sri Lanka Welimada/Bandarawela/Wellawaya – Uva Province
Completed:
2013 -2019
Services:
Supervision, Coordination & Monitering
Project Value:
USD 514 Million
Uma Oya multipurpose Development project is proposed to transfer water from Uma Oya to Kirindi Oya in order to develop hydropower and to irrigate the dry and less developed south-eastern region of the central highlands. Capacity of the electrical power generation is 120 MW and irrigation of approx. 25,000 acres of paddy lands. This project consists of two reservoirs at Puhulpola and Dyraaba, a conveyance tunnel linking the two reservoirs of 3.98 km. length, a 15.2 km long HeadRace tunnel, a powerhouse and a TailRace tunnel. The Puhulpola Reservoir is on the Dalgolla Oya and the Dyraaba Reservoir on the Mahatotilla Oya, both rivers discharging into the Uma Oya. Essentially, both reservoirs are in the Uma Oya sub-basin in the Mahaweli basin. The Puhulpola Reservoir and the Dyraaba Reservoir are connected by the Link tunnel. The Head Race Tunnel (HRT) with an intake in the Dyraaba Reservoir conveys an annual water conveyance of 145 MCM, leads to the Power House at Karandagolla with installed capacity of 120 MW. The tailrace tunnel from the Power House is directed into the Kirindi Oya. The Headeace Tunnel excavation is done by 2 Nos. Tunnel Boring Machines (TBM) which is a distinct part of this project.
