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The Oma Oya Multi-Purpose Project is designed to transfer water, generate hydropower, and support agriculture in the southeastern highlands of Sri Lanka. The project provides 145 cubic meters per minute of water for agriculture, increasing to 700 cubic meters per minute to supply a 120 MW hydropower plant.
The project includes two roller-compacted concrete (RCC) dams. The first dam on the Oma Oya River transfers water to the Deraba Dam reservoir through a 3.9 km transfer tunnel. From there, water is conveyed through an approximately 15.6 km water tunnel and a 595 m vertical shaft to an underground power plant. The discharged water is then conveyed through an approximately 3.3 km tunnel to the Alikota Oya River.
Omran Maroon Engineers Company successfully completed 3,357 meters of TBM tunnel excavation under some of the most challenging geological conditions in less than one year.
The Oma Oya Multi-Purpose Project is a large-scale water transfer and hydropower development scheme comprising two Roller-Compacted Concrete (RCC) dams, an integrated tunnel system, and an underground powerhouse. The project incorporates a 3.9 km transfer tunnel, an approximately 15 km main water tunnel, a 595 m vertical shaft, and a downstream tunnel connecting the powerhouse outlet to the Alikota Oya River.
As part of this major infrastructure development, Omran Maroon Engineers Co. was responsible for the excavation of critical tunnel sections using Tunnel Boring Machine (TBM) technology. The company successfully completed 3,357 meters of TBM tunnel excavation under highly challenging geological conditions within a 12-month construction period, demonstrating its expertise in mechanized tunneling and underground construction.
The project included a 15 km main tunnel with a 4.3 m diameter access gallery, executed in accordance with international tunneling standards and project specifications to ensure reliable long-term operation of the underground hydraulic system.
The execution of the Oma Oya Multi-Purpose Project engaged multidisciplinary engineering, tunneling, and construction teams throughout the project duration. The implementation of mechanized tunnel excavation using Tunnel Boring Machine (TBM) technology, together with underground construction activities, required the coordinated efforts of highly skilled engineers, technicians, and specialized tunneling personnel.
As the Contractor, Omran Maroon Engineers Co. managed the execution of the assigned tunnel excavation works, successfully completing 3,357 meters of TBM excavation under challenging geological conditions. The project demonstrated the company’s capability in organizing specialized construction teams and delivering complex underground infrastructure works in accordance with international engineering standards within the 12-month construction period.
Omran Maroon Engineers Co. manages the procurement and supply of construction materials, equipment, and site resources through an integrated supply chain management system. Procurement activities are carried out in accordance with project schedules, technical specifications, and quality requirements, ensuring the timely availability of materials and equipment while supporting efficient project execution.
