The Largest Reservoirs in Sri Lanka
(Top 25 Largest Reservoirs)
1. Senanayaka Samudraya
Gross Capacity: 950 MCM
Dam height: 44 m
Dam Length: 1.1 km
Location: Iginiyagala in Ampara District in Eastern Province
River Basin: Gal Oya
Completed year: 1956
Uses: Irrigation, Power Generation (11.25 MW), Domestic uses
2. Randenigala Reservoir
Gross Capacity: 864 MCM
Dam height: 94 m
Dam Length: 485 m
Location: in the border of Kandy and Nuwara Eliya Districts in Central Province
River Basin: Mahaweli
Completed year: 1986
Uses: Irrigation, Power Generation (122 MW)
3. Victoria Reservoir
Gross Capacity: 723 MCM
Dam height: 122 m
Dam Length: 520 m
Location: near Adhikarigama in Kandy District in Central Province
River Basin: Mahaweli
Completed year: 1984
Uses: Irrigation, Power Generation (210 MW)
4. Maduruoya Reservoir
Gross Capacity: 598 MCM
Dam height: 43 m
Dam Length: 1.1 km
Location: between Mahaoya and Aralaganwila in Ampara District in Eastern Province
River Basin: Maduru Oya
Completed year: 1983
Uses: Irrigation, Domestic uses
5. Moragahakanda Reservoir
Gross Capacity: 570 MCM
Dam height: 43 m
Dam Length: Main dam 404 m, Saddle dam I 370 m, Saddle dam II 275 m
Location: between Naula and Elahera (in the border of Central and North Central Provinces)
River Basin: Mahaweli (Across Amban ganga)
Completed year: 2018
Uses: Irrigation, Power Generation (25 MW)
6. Samanalawewa Reservoir
Gross Capacity: 278 MCM
Dam height: 100 m
Dam Length: 530 m
Location: near Belihul Oya in Rathnapura District in Sabaragamuwa Province
River Basin: Walawe (across Belihul Oya)
Completed year: 1992
Uses: Power Generation (120 MW), Irrigation
7. Udawalawa Reservoir
Gross Capacity: 269 MCM
Dam height: 39 m
Dam Length: 3.9 km
Location: near Udawalawa in the border of Sabaragamuwa and Uva Provinces
River Basin: Walawe
Completed year: 1973
Uses: Irrigation, Power Generation (06 MW), Domestic uses
8. Kaluganga Reservoir
Gross Capacity: 248 MCM
Dam height: 67 m
Dam Length: 546 m
Location: near Laggala in Matale District in Central Province
River Basin: Mahaweli (across Kalu ganga)
Completed year: 2018
Uses: Irrigation
9. Lunugamwehera Reservoir
Gross Capacity: 225 MCM
Dam height: 26 m
Dam Length: 4.7 km
Location: near Lunugamwehera in the border of Southern and Uva Provinces
River Basin: Kirindi Oya
Completed year: 1984
Uses: Irrigation
10. Kotmale Reservoir
Gross Capacity: 173 MCM
Dam height: 87 m
Dam Length: 600 m
Location: near Gampola in Kandy District in Central Province
River Basin: Mahaweli (across Kotmale Oya)
Completed year: 1985
Uses: Power Generation (201 MW), Irrigation
11. Yan Oya Reservoir
Gross Capacity: 169 MCM
Dam Length: Main dam 2.35 km, Saddle dams 3.59 km
Location: between Gomarankadawala and Wahalkada (in the border of North Central and Eastern Provinces)
River Basin: Yan Oya
Completed year: 2019
Uses: Irrigation
12. Ulhitiya and Ratkinda Reservoir
Gross Capacity: 145 MCM
Dam height: 28 m & 24 m
Dam Length: 2.3 km & 1 km
Location: near Giradurukotte in Badulla District in Uva Province
River Basin: Mahaweli
Completed year: 1982
Uses: Irrigation
13. Kantale Reservoir
Gross Capacity: 140 MCM
Dam height: 18 m
Dam Length: 2.2 km
Location: Kantale in Trincomalee District in Eastern Province
River Basin: Mahaweli
Completed year: 6 th Century AD by King Aggabodhi II and restored in 1986
Uses: Irrigation
14. Minneriya Reservoir
Gross Capacity: 135 MCM
Dam height: 21 m
Dam Length: 2 km
Location: Minneriya in Polonnaruwa District in North Central Province
River Basin: Mahaweli
Completed year: 3 rd Century AD by King Mahasen
Uses: Irrigation
15. Parakrama Samudra Reservoir
Gross Capacity: 134 MCM
Dam height: 16 m
Location: in Polonnaruwa in North Central Province
River Basin: Mahaweli
Completed year: 12 th Century AD by King Maha Parakramabahu
Uses: Irrigation
16. Kaudulla Reservoir
Gross Capacity: 128 MCM
Dam height: 17 m
Location: in Polonnaruwa District in North Central Province
River Basin: Mahaweli
Completed year: 3 rd Century AD by King Mahasen
Uses: Irrigation
17. Maussakele Reservoir
Gross Capacity: 124 MCM
Dam height: 41 m
Location: Maskeliya in Nuwara Eliya District in Central Province
River Basin: Kelani
Completed year: 1969
Uses: Power Generation (60MW)
18. Kala Wewa Reservoir
Gross Capacity: 123 MCM
Dam Length: 5 km
Location: near Kekirawa in Anuradhapura District in North Central Province
River Basin: Kala Oya
Completed year: 5 th Century AD by King Dhatusena
Uses: Irrigation
19. Pallan Oya Reservoir
Gross Capacity: 114 MCM
Dam height: 20 m
Location: in Ampara District and Eastern Province
River Basin: Gal Oya
Uses: Irrigation
20. Padaviya Reservoir
Gross Capacity: 105 MCM
Location: Padaviya in Anuradhapura District in North Central Province
River Basin: Yan Oya
Completed year: 3 rd Century AD by King Mahasen
Uses: Irrigation
21. Rajanganaya Reservoir
Gross Capacity: 100 MCM
Dam height: 18 m
Dam Length: 2 km
Location: near Thabuththegama (in the border of North Central and North Western Provinces)
River Basin: Kala Oya
Completed year: 1962
Uses: Irrigation
22. Weheragala Reservoir
Gross Capacity: 75 MCM
Dam height: 22 m
Dam Length: 2 km
Location: in Lunugamwehera National park in Uva Province
River Basin: Menik ganga
Completed year: 2009
Uses: Irrigation
23. Deduru Oya Reservoir
Gross Capacity: 75 MCM
Dam height: 20 m
Dam Length: 1.9 km
Location: near Wariyapola in Kurunegala District in North Western Province
River Basin: Deduru Oya
Completed year: 2014
Uses: Irrigation
24. Iginimitiya Reservoir
Gross Capacity: 72 MCM
Dam height: 18 m
Location: in Kurunegala District in North Western Province
River Basin: Mee Oya
Completed year: 1984
Uses: Irrigation
25. Hurulu Wewa Reservoir
Gross Capacity: 68 MCM
Dam height: 12 m
Location: in Anuradhapura District in North Central Province
River Basin: Yan Oya
Completed year: 3 rd Century AD by King Mahasen
Uses: Irrigation
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