Hydropower Plant Tunnel Uma Oya Sri Lanka

The Uma Oya Multipurpose development project is a water transfer, hydropower and irrigation project in the south-Eastern part of the central highland region of srilanka. The main part of the scheme is situated in the south-western part of the Badulla district in the province of Oya. The project will transfer annual long-term average water quantity of 145 mcm for irrigation purpose and will develop a head of a more than 700 m for the production of electricity in a power plant with rated capacity of about 120 mv. The Project Consists Of Two Rcc Dams. The Frist One is To Be Built on Uma Oya River at Puhulpola Region. The Water from Uma OyaRiverbe linked through an approximately 3.7 km long link tunnel (further called conveyance tunnel) into the reservoir of the dyraaba dam built on mahatotillaoya river. from where an approximately 15.2km long headrace tunnel and 595m high vertical shaft will convey water to the underground powerhouse. The discharge from the powerhouse will be directed into alikotaoya River Through an approximately 3.6 km long tailrace tunnel, Which Is a tributary of kirindiOya River.

Status of Project: complete

Project Highlights

Role of Parhoon Tarh: Contractor
Client: Farab Company
Consultant Engineer: Amberg Engineers
Location: Sri Lanka
Project Cost: 36 million USD
Project Duration: 25 Months


Featured Images

Project Volumes

Concrete Volume: 1,000 m3
Excavation: 222,000 m3

Project Specification

Length of Tunnel: 15 km
Tunnel outer Diameter: 4.3 m
Tunnel inner Diameter: 3.8 m

Project Goals

  • Construction of Headrace Tunnel -15 Km Length- of the Uma Oya Multipurpose Development Project in Sri Lanka by mechanized method

Project Stakeholders