Kotmale Dam

kotmale dam

The Kotmale dam is one of the five main head-work projects done under the Mahaweli Ganga Scheme. this is the most upstream of all.

Kotmale dam is the first with an upstream concrete membrane. The power station is the first Sri Lankan underground station. The dam was ceremoniously declared open in 1985.

There are three spillways and the type of it is called Radial gated, chute type spillway. Catchment area is 544 sq Km. The type of the dam is known as Rock fill with concrete membrane.

Kotmale Dam

Victoria Dam

Victoria Dam

Victoria dam is an Arch dam built across Sri Lanka’s longest river, which is Mahaweli River six (6) km from Teldeniya. The main purpose to build this is for irrigation and hydroelectric power production.  This dam is the tallest dam in the country. This was declared open by President HE J R Jayawardane in 1985.

Victoria Dam

Victoria Dam

The dam measures 122 m (400 ft) tall. It creates the Victoria reservoir, which spreads a surface area of 22.7 Km2. Dam consist of eight (8) spillways, which opens automatically when water levels are high.

The dam’s gates, which need power only to close, won an award for “Innovative Design in Civil Engineering” by the Institution of Civil Engineers.

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