| Polgolla Barrage | |
| Location Map: | Sri Lanka |
| Coordinates: | 7.3217°N 80.645°W |
| Country: | Sri Lanka |
| Location: | Polgolla, Central Province |
| Purpose: | P |
| Status: | O |
| Owner: | Mahaweli Authority |
| Dam Type: | B |
| Dam Crosses: | Mahaweli River |
| Dam Length: | 1440NaN0 |
| Dam Height Foundation: | 14.60NaN0 |
| Res Name: | Polgolla Reservoir |
| Res Capacity Total: | 4100000m2 |
| Res Capacity Active: | 2100000m2 |
| Res Max Length: | 1200m (3,900feet) |
| Res Max Width: | 170m (560feet) |
| Plant Name: | Ukuwela Power Station |
| Plant Coordinates: | 7.3989°N 80.6522°W |
| Plant Operator: | Ceylon Electricity Board |
| Website: | http://www.mahawelicomplex.lk/Poldam.html |
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 80NaN0 north, via penstock.[1] [2]
Polgolla Reservoir Waterdrome operates a short distance upstream on the lake created by the barrage.
Water from the Polgolla Reservoir is transferred to the Ukuwela Power Station at, near Ukuwela, via an 80NaN0 long underground penstock. Water from the reservoir is transferred to the power station at a rate of 2000ft3/s.
The power station at Ukuwela consists of two hydroelectric generators, totalling the plant capacity to . 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 140km (90miles) downstream of the Polgolla Barrage.[3]