Upper Kotmale Reservoir
| Upper Kotmale Dam | |
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The dam under construction in April 2011.
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 Location of Upper Kotmale Dam in Sri Lanka
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| Official name | Upper Kotmale Hydropower Project |
| Country | Sri Lanka |
| Location | Talawakele, Nuwara Eliya |
| Coordinates | 06°56′48″N 80°39′29″E / 6.94667°N 80.65806°ECoordinates: 06°56′48″N 80°39′29″E / 6.94667°N 80.65806°E |
| Purpose | O |
| Status | Operational |
| Construction began | 2003 |
| Opening date | 2012 |
| Construction cost | Rs. 44 billion |
| Owner(s) | Ceylon Electricity Board |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | Kotmale River |
| Height (foundation) | 35 m (115 ft) |
| Length | 180 m (591 ft) |
| Width (crest) | 7 m (23 ft) |
| Spillways | 5 |
| Spillway capacity | 3,000 m3/s (105,944.0 cu ft/s) |
| Reservoir | |
| Creates | Upper Kotmale Reservoir |
| Total capacity | 800,000 m3 (28,000,000 cu ft) |
| Surface area | 250,000 m2 (2,690,978 sq ft) |
| Power station | |
| Name | Upper Kotmale Power Station |
| Coordinates | 07°02′32″N 07°12′00″E / 7.04222°N 7.20000°E |
| Commission date | July 14, 2012 |
| Type | Run-of-the-river |
| Turbines | 2 × 75 MW Francis-type |
| Installed capacity | 150 MW |
| Annual generation | 409 GWh |
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Website http://www.ukhp.lk/ |
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The Upper Kotmale Dam (also known as the Upper Kotmale Hydropower Project, or UKHP) is located in Talawakele, within the Nuwara Eliya District, in the Central Province of Sri Lanka. The dam feeds the third largest hydroelectric power station in the country.
The project was initially planned in 1968 by the local authorities, before the Government of Japan funded a study between 1985 and 1987 to further examine the hydroelectric potential in the upper reaches of Kotmale River. The feasibility study included five sites and eight alternative development schemes, and concluded with two sites which were more technically and economically feasible.
The two sites were a conventional type at Caledonia, and a run-of-the-river type at Talawakele. The project at Caledonia involved the displacement of over 2,700 families and inundation of large areas of land used for tea plantations, and thus the Caledonia site was dropped. Further funding was then provided by Japan for the engineering study, which included a review of the feasibility study, selection of an optimal development plan, development of the detailed design, and the preparation of tender documents and an environmental impact assessment report.
The environmental impact assessment report was completed in September 1994, with the final design report completed in March 1995. The environmental assessment identified key issues associated with the project, which includes impact on St. Clair's Falls aesthetics due to stream flow reductions, social impacts due to resettlement of affected people, possible effects on ground water due to tunnelling, impacts on downstream water uses due to de-watering of streams, and impacts on biodiversity. These impacts led large delays in project development.
As per the National Environmental Act of 1998, the environmental clearance was then granted to the project. The project initially faced several objections, before being officially permitted by courts of law. Construction work on the project then began in 2006, and is expected to be completed by the end of 2011.
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