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| Randenigala Dam | |
|---|---|
| Name | Randenigala Dam |
| Location | Randenigala, Sri Lanka |
| Country | Sri Lanka |
| Purpose | Irrigation, Hydroelectricity, Flood control |
| Status | Operational |
| Construction began | 1981 |
| Opening | 1985 |
| Owner | Mahaweli Authority of Sri Lanka |
| Dam type | Embankment, Rock-fill |
| Dam height | 94 m |
| Dam length | 485 m |
| Reservoir name | Randenigala Reservoir |
| Plant operator | Ceylon Electricity Board |
| Plant capacity | 126 MW |
Randenigala Dam is a major embankment dam in Sri Lanka forming the Randenigala Reservoir on the Mahaweli River. Located in the North Central Province, the structure serves multi-purpose roles including irrigation, hydroelectric generation, and flood regulation. The project is integral to the Mahaweli Development Scheme and links to national water resource planning and energy networks.
The dam sits near the town of Randenigala in the vicinity of Polonnaruwa and close to cultural sites such as Anuradhapura and Sigiriya, within the administrative boundaries of the North Central Province, Sri Lanka and the Trincomalee District. It occupies a strategic position downstream of the Maduru Oya Reservoir and upstream of the Victoria Reservoir cascade on the Mahaweli River, Sri Lanka’s longest river. The embankment is a rock-fill structure occupying a valley carved through metamorphic formations related to the Sri Lanka Highlands, with access via regional transport links including the A11 road (Sri Lanka) and proximity to Polonnaruwa District facilities.
The dam was conceived as part of the larger Mahaweli Development Programme, an ambitious post-independence initiative influenced by advisers connected to institutions like the World Bank and bilateral partners such as the United Kingdom and Japan. Construction began in the early 1980s under contracts involving international and local contractors, with oversight by the Mahaweli Authority of Sri Lanka and technical input from engineering consultants familiar with projects like Kotmale Dam and Victoria Dam. The structure was completed and commissioned in 1985, during an era of accelerated infrastructure development under Sri Lankan administrations and in parallel with regional projects at Polgolla and Rantembe.
The embankment is designed as a rock-fill dam with an impervious core and a crest length of about 485 metres and a height of approximately 94 metres, comparable in scale to other major Sri Lankan hydrostructures. Appurtenant works include a gated spillway, intake structures feeding a headrace to the power station, and outlet works for irrigation releases tied into the Mahaweli irrigation network. The power plant houses Francis turbine units discharging into a tailrace that rejoins the Mahaweli River; electrical output is synchronized with the national grid managed by the Ceylon Electricity Board. Design standards drew upon international practice from bodies such as the International Commission on Large Dams.
The reservoir formed by the dam, Randenigala Reservoir, impounds monsoonal runoff collected from a catchment influenced by the Southwest monsoon and the Northeast monsoon systems affecting Sri Lanka. The impoundment shores intersect with local irrigation canals that feed the Maha Oya and command areas within the Mahaweli scheme, augmenting agricultural land near Anuradhapura District and Polonnaruwa District. Hydrological operation integrates flood attenuation functions to protect downstream settlements and reservoirs, coordinating releases with operators at Victoria Reservoir and adjacent cascade facilities.
The hydroelectric station associated with the dam has an installed capacity of about 126 MW, delivered through multiple turbine-generator units used for peak and base load support. Generation dispatch aligns with the Ceylon Electricity Board schedules and the national transmission system administered by the Ceylon Electricity Board and overseen in policy terms by the Ministry of Power and Energy (Sri Lanka). Auxiliary facilities include switchyards, control buildings, and access roads connecting to regional substations and the national grid nodes that also serve power plants such as Upper Kotmale Power Station and thermal stations like Norochcholai Power Station.
Reservoir creation led to landscape transformation affecting archeological zones near Polonnaruwa and habitats within the dry zone ecoregions of Sri Lanka, interacting with biodiversity conservation concerns overseen by agencies such as the Department of Wildlife Conservation (Sri Lanka) and the Central Environmental Authority. Resettlement and livelihood changes were administered under Mahaweli Authority frameworks, with impacts on communities in riparian villages and agrarian systems connected to the Mahaweli Authority. The project stimulated irrigation expansion benefitting paddy cultivation linked to markets in Colombo and provincial urban centres, while raising debates similar to those seen in other large dam projects evaluated by the World Commission on Dams.
Operational responsibilities rest with the Mahaweli Authority for water management and with the Ceylon Electricity Board for power plant operations, employing routine inspection regimes, sedimentation monitoring, and structural surveillance comparable to practices at Victoria Dam and Kotmale Dam. Maintenance programs include spillway gate servicing, instrumentation calibration, and contingency planning coordinated with the Disaster Management Centre (Sri Lanka) for flood risk. Periodic rehabilitation and studies on sediment management, seismic assessment, and efficiency upgrades have involved collaboration with academic institutions such as the University of Peradeniya and international consultants with experience across South Asian hydro projects.
Category:Dams in Sri Lanka Category:Hydroelectric power stations in Sri Lanka Category:Reservoirs in Sri Lanka