| Gal Oya Dam | |
| Location Map: | Sri Lanka |
| Coordinates: | 7.2103°N 81.5361°W |
| Country: | Sri Lanka |
| Location: | Gal Oya National Park |
| Purpose: | Irrigation, Power |
| Status: | O |
| Opening: | 1953 |
| Owner: | MIWRM |
| Dam Type: | E |
| Dam Crosses: | Gal Oya |
| Dam Length: | 3600feet |
| Dam Height Thalweg: | 140feet |
| Dam Volume: | 2000000abbr=onNaNabbr=on |
| Res Name: | Senanayake Samudhraya |
| Res Capacity Total: | 770000abbr=onNaNabbr=on |
| Res Surface: | 35mi2 |
| Plant Coordinates: | 7.2142°N 81.5372°W |
| Plant Operator: | Ceylon Electricity Board |
| Plant Type: | C |
| Plant Capacity: | 11 MW |
The Gal Oya Dam (also known as Inginiyagala Dam) is an embankment dam in the Uva Province of Sri Lanka. The dam creates one of the largest 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, completing four years later in .[1]
See main article: Senanayake Samudraya. The dam is constructed between two hills at the small town of Inginiyagala, measuring 3600feet and 140feet in length and height respectively, consisting of 2000000abbr=onNaNabbr=on of soil. The dam, built by Morrison-Knudsen company, creates the Gal Oya Reservoir.
The reservoir, also known as the Inginiyagala Reservoir, and more commonly as the Senanayake Samudraya (after D.S. Senanayake), has a total storage capacity of 770000abbr=onNaNabbr=on and a surface area of 35mi2.[2]
In addition to downstream irrigation, water from the reservoir is used to power the, a hydroelectric power station located immediately downstream of the dam. The power station consists of four units of (2.475MWx2 & 3.15MWx2), commissioned in 1952 unit 1,2 & 1962 unit 3,4.[3]