Polgolla Barrage

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Polgolla Barrage
Polgolla Barrage is located in Sri Lanka
Polgolla Barrage
Location of Polgolla Barrage in Sri Lanka
Country Sri Lanka
Location Polgolla, Central Province
Coordinates 07°19′18″N 80°38′42″E / 7.32167°N 80.64500°E / 7.32167; 80.64500
Purpose Power
Status Operational
Opening date July 1976 (1976-07)
Owner(s) Mahaweli Authority
Dam and spillways
Type of dam Barrage
Impounds Mahaweli River
Height (foundation) 14.6 m (48 ft)
Length 144 m (472 ft)
Creates Polgolla Reservoir
Total capacity 4,100,000 m3 (140,000,000 cu ft)
Active capacity 2,100,000 m3 (74,000,000 cu ft)
Maximum length 1,200 m (3,900 ft)
Maximum width 170 m (560 ft)
Power station
Name Ukuwela Power Station
Coordinates 07°23′56″N 80°39′08″E / 7.39889°N 80.65222°E / 7.39889; 80.65222
Operator(s) Ceylon Electricity Board
Turbines 2 × 20 MW
Installed capacity 40 MW

The Polgolla Barrage (also erroneously known as the Polgolla Dam), is a barrage built across the Mahaweli River at Polgolla, in the Central Province of Sri Lanka. The barrage is used to increase the volume of water, for transfer to the hydroelectric power station located 8 km (5 mi) north, via penstock.[1][2]

Power station[edit]

The Polgolla Barrage, as seen from the left-bank downriver.

Water from the Polgolla Reservoir is transferred to the Ukuwela Power Station at 07°23′56″N 80°39′08″E / 7.39889°N 80.65222°E / 7.39889; 80.65222 (Ukuwela Power Station), near Ukuwela, via a 8 km (5 mi) long underground penstock. Water from the reservoir is transferred to the power station at a rate of 2,000 cu ft/s (57 m3/s).[2]

The power station at Ukuwela consists of two 20 MW hydroelectric generators, totalling the plant capacity to 40 MW. Both units were commissioned in July 1976. Water from the power station is discharged into the Amban River, a major tributary to the Mahaweli River, which then connects back to the Mahaweli River at a distance of approximately 140 km (87 mi) downstream of the Polgolla Barrage.[3][1]

See also[edit]


  1. ^ a b "Polgolla Barrage and Reservoir". Mahaweli Authority. Retrieved 19 January 2014. 
  2. ^ a b "CEB Hydropower Generation". Ceylon Electricity Board. Retrieved 19 January 2014. 
  3. ^ "CEB Generation Details: Laxapana Complex". Ceylon Electricity Board. Retrieved 18 January 2014.