|Operator(s)||Ministry of Irrigation|
|Dam and spillways|
|Length||350 m (1,150 ft)|
|Total capacity||100.37×106 m3 (3,545×106 cu ft)|
|Catchment area||76,863.60 hectares (189,934.1 acres)|
The Rajanganaya Dam (also sometimes called Rajangana) is an irrigation dam built across the Kala Oya river, at Rajanganaya, bordering the North Western and North Central provinces of Sri Lanka. The main concrete dam measures approximately 350 m (1,150 ft) and creates the Rajanganaya Reservoir, which has a catchment area of 76,863.60 hectares (189,934.1 acres) and a total storage capacity of 100.37 million cubic metres (3,545×106 cu ft).
A dam is a barrier that stops or restricts the flow of water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC.
The Kala Oya is the third longest river in Sri Lanka. It is approximately 145 km (90 mi) in length. The river has a basin size of 2,873 km2 (1,109 sq mi), and more than 400,000 rural population live by the river basin.
Rajanganaya Divisional Secretariat is a Divisional Secretariat of Anuradhapura District, of North Central Province, Sri Lanka.
Kurunegala is a district in North Western Province, Sri Lanka. Consists of 4812.7 km2 48,1270 Hectares and Consists 30 Divisional Secretariats, 1610 Grama Niladari Divisions and 4476 total Villages. It consists of 14 Electorate Divisions, 02 Municipal Council, 19 Urban Councils, 15 Parliamentary Ministers, 47 Provincial Council Members, 15 Ministers and 337 Local Council Members.
The Mahaweli River, is a 335 km (208 mi) long river, ranking as the longest river in Sri Lanka. Its drainage basin is the largest in the country, and covers almost one-fifth of the total area of the island. The real creation of Mahaweli ganga starts at Polwathura(at Mahawila area), a remote village of Nuwara-Eliya District in bank Nawalapitiya of Kandy District by further joining of Hatton oya and Kotmale oya.The river reaches the Bay of Bengal on the southwestern side of Trincomalee Bay. The bay includes the first of a number submarine canyons, making Trincomalee one of the finest deep-sea harbors in the world.
The Broadlands Dam is a 35 MW run-of-the-river hydroelectric complex currently under construction in Kitulgala, Sri Lanka. The project is expected to be completed in 2020, and will consist of two dams, and a power station further downstream.
The Bowatenna Dam is a 100 ft (30 m) high gravity dam at Bowatenna, in the Central Province of Sri Lanka. The dam was built in June 1981, and is used primarily for irrigation. A 40 MW power station is also constructed 5,800 ft (1,800 m) downstream, for hydroelectric power generation.
The Kandalama Reservoir is a reservoir in Kandalama, Sri Lanka. The reservoir is created by the 21 m (69 ft) high and 1,600 m (5,200 ft) wide Kandalama Dam. Water from the dam is used for irrigation purposes in the region, extending up to Kekirawa. The tank was created by constructing a dam across one of the main tributaries of Kala Wewa - the Mirisgoniya River. During 1952 to 1957, the tank was rehabilitated by Department of Irrigation of Sri Lanka. The reservoir and hotel is situated with the Kaludiya Pokuna Forest archeological site.
The Maskeliya Dam is a large gravity dam at Maskeliya, in the Central Province of Sri Lanka. Along with the Castlereigh Dam, the dams are the highest point and beginning of the Laxapana Hydropower Complex, involving a number of dams, penstocks, and hydroelectric power stations. The dam creates the Maskeliya Reservoir over the route of Maskeliya Oya, a major tributary of the Kelani River, which is the 4th longest in the country.
The Castlereigh Dam is a gravity dam built across the Kehelgamu Oya, a major tributary to the Kelani River, approximately 3 km (1.9 mi) south-west of Hatton, in the Central Province of Sri Lanka.
The Norton Dam is a small gravity dam built across the Kehelgamu Oya, which is a major tributary to the Kelani River. The dam is built at Norton Bridge, in the Central Province of Sri Lanka.
The Canyon Dam is a large arch-gravity dam built across the Maskeliya Oya, 4.5 km (2.8 mi) upstream of the iconic Laxapana Falls, in the Central Province of Sri Lanka. The associated power station plays a major role in the national power grid, due to its significant output.
The Gal Oya Dam is an embankment dam in the Uva Province of Sri Lanka. The dam creates one of the largest and most iconic reservoirs in the country, the Gal Oya Reservoir. Water from the reservoir is used primarily for irrigation in the Uva and Eastern provinces, in addition to powering a small hydroelectric power station. Construction of the dam and reservoir began in August 24, 1949, completing four years later in 1953.
The Inginimitiya Dam is an embankment dam built across the Mi Oya, at Inginimitiya, Sri Lanka. Measuring 4,880 m (16,010 ft) wide and 18 m (59 ft) tall, the dam creates the popular Inginimitiya Reservoir, which is primarily used for irrigation purposes, among other reasons.
The Gal Oya is a 108 km (67 mi) long river, in South east Sri Lanka. It is the 16th longest river in Sri Lanka. It begins in the hills east of Badulla and flows northeast, emptying into the Indian Ocean south of Kalmunai.
The Deduru Oya Dam is an embankment dam built across the Deduru River in Kurunegala District of Sri Lanka. Built in 2014, the primary purpose of the dam is to retain approximately a billion cubic metres of water for irrigation purposes, which would otherwise flow out to sea. Construction of the dam began in 2006 and was ceremonially completed in 2014, with the presence of former President Mahinda Rajapaksa.
The Rambakan Oya Dam is an embankment dam in Maha Oya, Eastern Province, Sri Lanka. The reservoir was designed and constructed by the Sri Lanka Mahaveli Authority and currently functions under the direction of the Ministry of Irrigation and Water Resources Management. It have been created by building an Earthen dam of which is about 1225m in length across the river of Mundeni Aru.
Nanu Oya is a 27 km (17 mi) long stream in the Central Province of Sri Lanka It originates from Pidurutalagala at an elevation of over 2,000 m (6,562 ft) and drains into the Kotmale Oya at an elevation of approximately 1,200 m (3,937 ft). The Kotmale Oya is a tributary of the Mahaweli River, the longest river in Sri Lanka, which finally discharges at Trincomalee after a combined distance of nearly 350 km (217 mi). The river was dammed in 1873 to create the popular Lake Gregory in Nuwara Eliya. The Nanu Oya discharges into the Kotmale Oya 2.5 km (1.6 mi) upstream of the Upper Kotmale Dam.
The Uma Oya Hydropower Complex (also internally called Uma Oya Multipurpose Development Project or UOMDP) is a irrigation and hydroelectric complex currently under construction in the Badulla District of Sri Lanka. Early assessments of project dates back to 1989, when the first studies was conducted by the country's Central Engineering and Consultancy Bureau. The complex involves building a dam across Dalgolla Oya, and channelling water over a 3,975 m (13,041 ft) tunnel to Mathatilla Oya, both of which are tributaries of the Uma Oya. At Mathatilla Oya, another dam is constructed to channel 145,000,000 m3 (5.1×109 cu ft) of water per annum, via a 15,290 m (50,160 ft) headrace tunnel to the Uma Oya Power Station, where water then discharged to the Alikota Aru via a 3,335 m (10,942 ft) tailrace tunnel. The Alikota Aru is a trubutary of the Kirindi Oya.
Malala-Ambilikala lagoons are two interconnected coastal water-bodies located inside the Bundala National Park, Hambantota District in the Southern Province, Sri Lanka. It is 260 km (160 mi) from Colombo to the arid south. The Malala-Ambilikala lagoons are two of the three key lagoons located within the Bundala Ramsar wetlands.
The Maduru Oya Dam is an irrigation dam built across the Maduru Oya. The embankment dam measures 1,090 m (3,580 ft) in length, 41 m (135 ft) in height, and creates the Maduru Oya Reservoir. The reservoir has a catchment area of 453 km2 (175 sq mi) and a storage capacity of 596,000,000 cubic metres (2.10×1010 cu ft)
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