|Rambakan Oya Dam|
|Purpose||Irrigation and Domestic water supply|
|Construction began||12 February 2007|
|Opening date||20 July 2013|
|Owner(s)||Ministry of Irrigation|
|Dam and spillways|
|Type of dam||Earthen dam|
|Height||24.7 m (81 ft)|
|Length||1,225 m (4,019 ft)|
|Width (crest)||7 m (23 ft)|
|Spillway type||Radial Gate|
|Spillway capacity||554.75 m3/s (19,591 cu ft/s)|
|Creates||Rambakan Oya Reservoir|
|Total capacity||56,000,000 m3 (2.0×109 cu ft)|
|Catchment area||129.5 km2 (50.0 sq mi)|
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.
An embankment dam is a large artificial dam. It is typically created by the placement and compaction of a complex semi-plastic mound of various compositions of soil, sand, clay, or rock. It has a semi-pervious waterproof natural covering for its surface and a dense, impervious core. This makes such a dam impervious to surface or seepage erosion. Such a dam is composed of fragmented independent material particles. The friction and interaction of particles binds the particles together into a stable mass rather than by the use of a cementing substance.
The Maha Oya is a major stream in the Sabaragamuwa Province of Sri Lanka. It measures approximately 134 km (83 mi) in length. It runs across four provinces and five districts. Maha Oya has 14 Water supply networks to serve the need of water and more than 1 million people live by the river.
The Eastern Province is one of the nine provinces of Sri Lanka, the first level administrative division of the country. The provinces have existed since the 19th century but did not have any legal status until 1987 when the 13th Amendment to the Constitution of Sri Lanka established provincial councils. Between 1988 and 2006 the province was temporarily merged with the Northern Province to form the North Eastern Province. The capital of the province is Trincomalee.
The Rambakan Oya reservoir project is a multipurpose irrigation project which is commissioned to find a solution for the drinking water issue and irrigation problems in the area.It is the 10th zone of Mahaweli Development scheme and located bordering Badulla, Monaragala and Ampara districts.
The Mahaweli Development programme is known as the largest multipurpose national development programme in the history of Sri Lanka and is also considered as the keystone of the government's development programme that was initiated in 1961.
Badulla is the main city of Uva Province situated in the lower central hills of Sri Lanka. It is the capital city of Uva Province and the Badulla District.
Monaragala is a town located in Monaragala District, Uva Province, Sri Lanka. It is the largest town in Monaragala District and is located 57.3 km (35.6 mi) northwest of Badulla, the capital city of Uva Province. The town of Monaragala is situated about 151 m (495 ft) above sea level on the Colombo-Batticaloa main road.
There are archaeological evidences, those reveals about previous attempts to construct an irrigation tank here during the ancient time periods.According to them there are different legends and archaeological views on ancient construction of Rambakan Oya Reservoir. It is believed that construction of Rambaken Oya Reservoir was commenced by prince Giri Abaya who ruled the East, in third century, B.C. According to some other historical evidences it was commenced by Prince Saddhatissa (137-119 BC).
Saddha Tissa was a monarch of the Kingdom of Anuradhapura, based at the ancient capital of Anuradhapura from 137 BC to 119 BC. Saddha Tissa was the son of Kavan Tissa of Ruhuna and the brother of Dutthagamani. He was the ruler of Digamadulla, the present day eastern province of Sri Lanka.
There is a one-mile longed old earthen dam can be seen, near to the newly constructed dam. It was constructed between Gorikanda and Galkanda with rip rap, in high quality. Around 250 feet long dressed stones made to use for the twin Barrel Sluice are still remaining in surrounding. Any way there is no evidence to prove that the construction was completed or the reservoir was functioned.
Near to the old Sluice, a stone slab inscription belonging to 12th – 13th centuries can be seen and which identified as Rambakan Oya Slab Inscription. It describes that the stone canal was built by Liyana Nayakayan and Kanathkan Vahanse, who lived in the Gal Weta area.
A sluice is a water channel controlled at its head by a gate. A mill race, leet, flume, penstock or lade is a sluice channelling water toward a water mill. The terms sluice, sluice gate, knife gate, and slide gate are used interchangeably in the water and wastewater control industry.
The recent project to develop the Rambakan Oya reservoir was commenced on 12 February 2007and the opening ceremony was held on 20 July 2013 with the participation of then Sri Lanka President Mahinda Rajapaksa and Irrigation and Water Resources Management Minister.
Percy Mahendra Rajapaksa is a Sri Lankan politician serving as Leader of the Opposition since 2018, and has served as Member of Parliament (MP) for Kurunegala since 2015. He served as the President of Sri Lanka and Leader of the Sri Lanka Freedom Party from 2005 to 2015.
The ancient Sinhalese excelled in the construction of tanks (Wevas) or reservoirs, dagobas and palaces in Sri Lanka, as evident from the ruins which displays a rich variety of architectural forms.
Kala Wewa, built by the King Datusena in 307 B.C, is a twin reservoir complex which has a capacity of 123 million cubic meters. This reservoir complex has facilitated with a stone made spillway and three main sluices. From the central major sluice, a 40 feet wide central conveys water to feed thousands of acres of paddy lands and ends at the historical capital Anuradhapura city tank Tissa Wewa meandering over 87 km (54 mi) at a slope of 6 inches per mile and is another wonder of primeval hydraulic engineering facility in ancient Ceylon.
Victoria Dam is an arch dam located 130 mi (209 km) upstream of the Mahaweli River's mouth and 4 mi (6 km) from Teldeniya. Its main purposes are irrigation and hydroelectric power production. It is the tallest dam in Sri Lanka, and supports a 210 MW power station, the largest hydroelectric power station in the country. Construction of the dam commenced in 1978, and was ceremonially completed by then-President Jayewardene in April 1985.
The Anuradhapura Kingdom, named for its capital city, was the first established kingdom in ancient Sri Lanka and Sinhalese people. Founded by King Pandukabhaya in 377 BC, the kingdom's authority extended throughout the country, although several independent areas emerged from time to time, which grew more numerous towards the end of the kingdom. Nonetheless, the king of Anuradhapura was seen as the supreme ruler of the country throughout the Anuradhapura period. Buddhism played a strong role in the Anuradhapura period, influencing its culture, laws, and methods of governance. Society and culture were revolutionized when the faith was introduced during the reign of King Devanampiya Tissa; this cultural change was further strengthened by the arrival of the Tooth Relic of the Buddha in Sri Lanka and the patronage extended by her rulers.
Maduru Oya National Park is a national park of Sri Lanka, established under the Mahaweli development project and also acts as a catchment of the Maduru Oya Reservoir. The park was designated on 9 November 1983. Providing a sanctuary to wildlife, especially for elephants and protecting the immediate catchments of five reservoirs are the importance of the park. A community of Vedda people, the indigenous ethnic group of Sri Lanka lives within the park boundary in Henanigala. The park is situated 288 kilometres (179 mi) north-east of Colombo.
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.
Minneriya tank is a reservoir in Sri Lanka made by an old civilisation; the Anuradhapura Kingdom. King Mahasena ordered a dam build across the Minneriya River, which made the lake. The tank covered 4,670 acres (18.9 km2).
The Moragahakanda Dam, officially as Kulasinghe Reservoir, is a large gravity dam, and the main component of the larger and more complex Moragahakanda — Kalu Ganga Project, currently under construction across the Amban River at Elahera, in the Matale District of Sri Lanka. Construction began on 25 January 2007. The maiden waters of the dam was released in January 2017. Morgahakanda/Kaluganga project is the last of the Great Mahaveli project
The Kalu Ganga Dam is a large gravity dam, and the second vital component of the larger and more complex Moragahakanda — Kalu Ganga Project, currently under construction across the Kalu Ganga at Pallegama, in the Matale District of Sri Lanka. Construction of the project was launched by President Mahinda Rajapaksa on 25 January 2007. The maiden waters of the dam was released in July 2018.
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 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 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 Rajanganaya Dam 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 and a total storage capacity of 100.37 million cubic metres.
Iranamadu Tank is an irrigation tank in northern Sri Lanka, approximately 3 mi (5 km) south east of Kilinochchi.
Giant's Tank is an irrigation tank in northern Sri Lanka, approximately 10 mi (16 km) south east of Mannar.
Sorabora Wewa is an ancient reservoir in Mahiyangana, Badulla District Sri Lanka. It is thought to have been constructed during the reign of King Dutugemunu by a giant named Bulatha. In the ancient past, this tank was known as the 'Sea of Bintenna'.
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.
Yoda Ela or Jaya Ganga, an 87 km (54 mi) long single banking water canal carrying excess water from Kala Wewa reservoir to Thissa Wewa reservoir in Anuradhapura. The Yodha Ela is known for achieving a rather low gradient for its time. The gradient is about 10 centimetres per kilometre or 6 inches per mile.