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As part of Mahaweli Development programme, the river and its tributaries are dammed at several locations to allow irrigation in the dry zone, with almost 1,000 km 2 (386 sq mi) of land irrigated. [5] The production of hydroelectricity from six dams in the Mahaweli system supplies more than 40% of Sri Lanka's electricity needs.
Mahaweli River. Request. I need the river outline in a standard blue color for livers on a Sri Lankan Map. I found some good data for the River in the OpenStreetMap, I accessed a copy of data through this Overpass Turbo site (you can export it in many formats, click the 'Export' button). You can export it in many other tools.
There are two words meaning "river" in the Sinhala language, namely Ganga (ගඟ) and Oya (ඔය), of which the usage of both terms is arbitrary. At 335 km (208 mi), the Mahaweli River is the longest river on the island, its drainage basin covering more than one-fifth of the island. It is estimated that there are 103 rivers in Sri Lanka. [1]
The park's elevation range from 20–60 metres (66–197 ft) with sparse rock outcrop. [3] The Mahaweli River flows from south to north through the centre of the park. The rich alluvial soil flood plains situated beside the river are featured by a number of shallow swampy depressions called "villus".
The central riparian flood plain is featured by many old river channels and contain dispersed 'villus', the waterfilled basins around among the grassy plains. There are 20 such villus is located in the park. [3] Somawathiya and Flood plains national parks are important protected areas for the wetland system of Mahaweli River flood plains. [5]
The Kotmale River [1] (Sinhala: කොත්මලේ ඔය) is the longest tributary of Mahaweli River. The river begins as the Agra Oya, in the Horton Plains. The Central Plains have an annual rainfall of between 125 and 200 inches a year. The river is approximately 70 km (43 mi) long and drains a basin of about 58,534 ha (226 square miles).
Mahaweli Authority is a state-owned operator in Sri Lanka for managing the Mahaweli River and its projects. It was established in 1979. [2]The primary objective of the Mahaweli Authority is to implement the Mahaweli River development scheme.
The Mahaweli Development program (Sinhala: මහවැලි සංවර්ධන වැඩසටහන) is known as the largest multipurpose national development program in the history of Sri Lanka and is also considered the keystone of the government's development program that was initiated in 1961.