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Reservoirs (Irrigation Department)

The Irrigation Department's 74 major and 43 medium reservoirs: effective storage and % full, daily from 2020/21, and the totals with the long-term average. Daily, 2020–2026.

Published by the Irrigation Department; read from Irrigation Department: daily water level and storage of major and medium reservoirs.

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Akathimuruppu reservoir

Effective storage (Irrigation Department)765ac-ft+553.8%
Effective storage, % of active storage (Irrigation Department)10.0%+8.5 pts

Alikota ara reservoir

Effective storage (Irrigation Department)3,354ac-ft−5.1%
Effective storage, % of active storage (Irrigation Department)70.2%−3.7 pts

Alugalge reservoir

Effective storage (Irrigation Department)164ac-ft−56.5%
Effective storage, % of active storage (Irrigation Department)17.0%−22.0 pts

Ambakolawewa reservoir

Effective storage (Irrigation Department)6,450ac-ft+103.1%
Effective storage, % of active storage (Irrigation Department)100.0%+50.8 pts

Ambalan Oya reservoir

Effective storage (Irrigation Department)8,250ac-ft−50.7%
Effective storage, % of active storage (Irrigation Department)25.5%−26.1 pts

Ambewela reservoir

Effective storage (Irrigation Department)1,400ac-ft0.0%
Effective storage, % of active storage (Irrigation Department)100.0%no change

Angamuwa reservoir

Effective storage (Irrigation Department)6,950ac-ft−35.9%
Effective storage, % of active storage (Irrigation Department)54.9%−30.9 pts

Attaragalla reservoir

Effective storage (Irrigation Department)3,250ac-ft+180.2%
Effective storage, % of active storage (Irrigation Department)89.1%+57.3 pts

Badagiriya reservoir

Effective storage (Irrigation Department)5,800ac-ft−8.3%
Effective storage, % of active storage (Irrigation Department)65.7%−5.9 pts

Badulu Oya reservoir

Effective storage (Irrigation Department)171ac-ft−49.1%
Effective storage, % of active storage (Irrigation Department)8.7%−8.4 pts

Balaharuwa reservoir

Effective storage (Irrigation Department)678ac-ft−20.2%
Effective storage, % of active storage (Irrigation Department)79.8%−20.2 pts

Basavakkulama (Abaya wewa) reservoir

Effective storage (Irrigation Department)780ac-ft+105.3%
Effective storage, % of active storage (Irrigation Department)45.8%+23.5 pts

Batalagoda reservoir

Effective storage (Irrigation Department)4,532ac-ft+29.7%
Effective storage, % of active storage (Irrigation Department)96.6%+22.1 pts

Bomuruella reservoir

Effective storage (Irrigation Department)1,030ac-ft0.0%
Effective storage, % of active storage (Irrigation Department)100.0%no change

Dambarawa reservoir

Effective storage (Irrigation Department)7,716ac-ft+30.4%
Effective storage, % of active storage (Irrigation Department)69.8%+16.3 pts

Dambewewa reservoir

Effective storage (Irrigation Department)213ac-ft−53.5%
Effective storage, % of active storage (Irrigation Department)19.5%−22.5 pts

Debara Ara reservoir

Effective storage (Irrigation Department)424ac-ft+190.4%
Effective storage, % of active storage (Irrigation Department)44.8%+29.4 pts

Debarawewa reservoir

Effective storage (Irrigation Department)710ac-ft+11.8%
Effective storage, % of active storage (Irrigation Department)100.0%+10.6 pts

Deduru Oya reservoir

Effective storage (Irrigation Department)60,832ac-ft+55.9%
Effective storage, % of active storage (Irrigation Department)100.0%+34.7 pts

Dehigama reservoir

Effective storage (Irrigation Department)218ac-ft−34.7%
Effective storage, % of active storage (Irrigation Department)12.4%−6.6 pts

Demodara reservoir

Effective storage (Irrigation Department)1ac-ft−99.2%
Effective storage, % of active storage (Irrigation Department)0.0%−7.6 pts

Denagama reservoir

Effective storage (Irrigation Department)1,074ac-ft+47.9%
Effective storage, % of active storage (Irrigation Department)100.0%+30.3 pts

Detagamuwa reservoir

Effective storage (Irrigation Department)64ac-ft−90.6%
Effective storage, % of active storage (Irrigation Department)5.8%−56.3 pts

Dewahuwa reservoir

Effective storage (Irrigation Department)11,020ac-ft+32.1%
Effective storage, % of active storage (Irrigation Department)100.0%+23.5 pts

Ekgal Oya reservoir

Effective storage (Irrigation Department)8,636ac-ft−10.6%
Effective storage, % of active storage (Irrigation Department)38.7%−4.6 pts

Ellewela reservoir

Effective storage (Irrigation Department)865ac-ft+19.0%
Effective storage, % of active storage (Irrigation Department)100.0%+10.4 pts

Ethimale reservoir

Effective storage (Irrigation Department)130ac-ft−95.0%
Effective storage, % of active storage (Irrigation Department)2.6%−49.4 pts

Giants Tank reservoir

Effective storage (Irrigation Department)12,993ac-ft+107.1%
Effective storage, % of active storage (Irrigation Department)42.0%+21.7 pts

Giritale reservoir

Effective storage (Irrigation Department)7,626ac-ft−52.3%
Effective storage, % of active storage (Irrigation Department)36.2%−39.6 pts

Hakwatunawa wawa reservoir

Effective storage (Irrigation Department)7,445ac-ft+4.6%
Effective storage, % of active storage (Irrigation Department)44.6%+2.0 pts

Haliela reservoir

Effective storage (Irrigation Department)1,511ac-ft+10.9%
Effective storage, % of active storage (Irrigation Department)49.3%+4.8 pts

Halmillapillewa reservoir

Effective storage (Irrigation Department)363ac-ft−67.1%
Effective storage, % of active storage (Irrigation Department)18.5%−37.6 pts

Hambegamuwa reservoir

Effective storage (Irrigation Department)2,930ac-ft+240.7%
Effective storage, % of active storage (Irrigation Department)71.3%+50.4 pts

Handapanagala reservoir

Effective storage (Irrigation Department)8,823ac-ft−2.2%
Effective storage, % of active storage (Irrigation Department)61.8%−1.4 pts

Himbiliyakada reservoir

Effective storage (Irrigation Department)20ac-ft–
Effective storage, % of active storage (Irrigation Department)1.1%+1.1 pts

Hulugalla reservoir

Effective storage (Irrigation Department)1,521ac-ft+36.2%
Effective storage, % of active storage (Irrigation Department)100.0%+22.2 pts

Huruluwewa reservoir

Effective storage (Irrigation Department)13,920ac-ft−28.4%
Effective storage, % of active storage (Irrigation Department)26.3%−10.4 pts

Inginimitiya reservoir

Effective storage (Irrigation Department)29,646ac-ft+56.9%
Effective storage, % of active storage (Irrigation Department)58.3%+21.1 pts

Iratperiyakulam reservoir

Effective storage (Irrigation Department)520ac-ft+30.0%
Effective storage, % of active storage (Irrigation Department)14.7%+3.4 pts

Jayawewa reservoir

Effective storage (Irrigation Department)6,988ac-ft+67.8%
Effective storage, % of active storage (Irrigation Department)90.7%+36.6 pts

Kahakurullanpelassa reservoir

Effective storage (Irrigation Department)170ac-ft+53.2%
Effective storage, % of active storage (Irrigation Department)55.6%+19.3 pts

Kalugaloya reservoir

Effective storage (Irrigation Department)1,376ac-ft−61.8%
Effective storage, % of active storage (Irrigation Department)17.5%−28.3 pts

Kande Ela reservoir

Effective storage (Irrigation Department)1,703ac-ft0.0%
Effective storage, % of active storage (Irrigation Department)98.8%no change

Kandiyapita LB reservoir

Effective storage (Irrigation Department)967ac-ft+34.9%
Effective storage, % of active storage (Irrigation Department)87.4%+22.6 pts

Kantale reservoir

Effective storage (Irrigation Department)34,583ac-ft−32.6%
Effective storage, % of active storage (Irrigation Department)30.3%−14.7 pts

Karawila reservoir

Effective storage (Irrigation Department)43ac-ft−70.1%
Effective storage, % of active storage (Irrigation Department)15.3%−35.6 pts

Kaudulla reservoir

Effective storage (Irrigation Department)19,700ac-ft−32.6%
Effective storage, % of active storage (Irrigation Department)19.8%−9.6 pts

Kekanadura reservoir

Effective storage (Irrigation Department)1,590ac-ft−0.7%
Effective storage, % of active storage (Irrigation Department)70.1%−0.5 pts

Kekiriobada reservoir

Effective storage (Irrigation Department)1,094ac-ft+371.6%
Effective storage, % of active storage (Irrigation Department)51.7%+40.7 pts

Kimbulwanaoya reservoir

Effective storage (Irrigation Department)5,105ac-ft+43.6%
Effective storage, % of active storage (Irrigation Department)78.9%+23.9 pts

Kotiyagala reservoir

Effective storage (Irrigation Department)63ac-ft−75.3%
Effective storage, % of active storage (Irrigation Department)3.0%−9.0 pts

Lahugala reservoir

Effective storage (Irrigation Department)350ac-ft+124.4%
Effective storage, % of active storage (Irrigation Department)13.1%+7.3 pts

Lunugamwehera reservoir

Effective storage (Irrigation Department)109,653ac-ft−8.7%
Effective storage, % of active storage (Irrigation Department)64.3%−6.1 pts

Magalla reservoir

Effective storage (Irrigation Department)7,496ac-ft+7.6%
Effective storage, % of active storage (Irrigation Department)100.0%+5.7 pts

Maha Aluthgamara reservoir

Effective storage (Irrigation Department)987ac-ft−2.0%
Effective storage, % of active storage (Irrigation Department)63.2%−1.2 pts

Mahadivul Wewa reservoir

Effective storage (Irrigation Department)8,567ac-ft−0.4%
Effective storage, % of active storage (Irrigation Department)44.8%−0.1 pts

Mahagal wewa reservoir

Effective storage (Irrigation Department)668ac-ft−58.7%
Effective storage, % of active storage (Irrigation Department)26.6%−37.8 pts

Mahakandarawa reservoir

Effective storage (Irrigation Department)9,200ac-ft+67.3%
Effective storage, % of active storage (Irrigation Department)26.6%+10.7 pts

Mahawewa reservoir

Effective storage (Irrigation Department)272ac-ft−18.6%
Effective storage, % of active storage (Irrigation Department)44.1%−9.9 pts

Mahawilachchiya reservoir

Effective storage (Irrigation Department)19,868ac-ft+14.9%
Effective storage, % of active storage (Irrigation Department)63.1%+8.2 pts

Mailagama reservoir

Effective storage (Irrigation Department)53ac-ft−65.6%
Effective storage, % of active storage (Irrigation Department)18.2%−34.4 pts

Mallipotha reservoir

Effective storage (Irrigation Department)213ac-ft−39.1%
Effective storage, % of active storage (Irrigation Department)28.7%−18.5 pts

Manankattiya reservoir

Effective storage (Irrigation Department)735ac-ft−71.7%
Effective storage, % of active storage (Irrigation Department)16.1%−40.8 pts

Mapakada reservoir

Effective storage (Irrigation Department)4,295ac-ft−21.8%
Effective storage, % of active storage (Irrigation Department)57.1%−16.0 pts

Maruthamadu reservoir

Effective storage (Irrigation Department)358ac-ft+55.0%
Effective storage, % of active storage (Irrigation Department)23.9%+8.5 pts

Mau Ara reservoir

Effective storage (Irrigation Department)17,947ac-ft+222.2%
Effective storage, % of active storage (Irrigation Department)66.3%+45.7 pts

Mediyawa reservoir

Effective storage (Irrigation Department)2,415ac-ft+55.1%
Effective storage, % of active storage (Irrigation Department)93.1%+33.1 pts

Minneriya reservoir

Effective storage (Irrigation Department)67,947ac-ft−21.8%
Effective storage, % of active storage (Irrigation Department)64.1%−17.8 pts

Mora Wewa reservoir

Effective storage (Irrigation Department)4,410ac-ft−53.8%
Effective storage, % of active storage (Irrigation Department)13.3%−15.6 pts

Morana reservoir

Effective storage (Irrigation Department)172ac-ft−94.2%
Effective storage, % of active storage (Irrigation Department)1.5%−24.5 pts

Muhathankulam reservoir

Effective storage (Irrigation Department)438ac-ft+873.3%
Effective storage, % of active storage (Irrigation Department)18.3%+16.4 pts

Muruthawela reservoir

Effective storage (Irrigation Department)9,545ac-ft−46.8%
Effective storage, % of active storage (Irrigation Department)26.7%−23.5 pts

Muthukandiya reservoir

Effective storage (Irrigation Department)11,671ac-ft−38.7%
Effective storage, % of active storage (Irrigation Department)51.3%−32.3 pts

Nachchaduwa reservoir

Effective storage (Irrigation Department)22,350ac-ft−23.2%
Effective storage, % of active storage (Irrigation Department)49.6%−15.0 pts

Nagadeepa reservoir

Effective storage (Irrigation Department)1,033ac-ft−47.5%
Effective storage, % of active storage (Irrigation Department)4.6%−4.2 pts

Nalanda reservoir

Effective storage (Irrigation Department)13,318ac-ft+103.9%
Effective storage, % of active storage (Irrigation Department)100.0%+49.2 pts

Namal Oya reservoir

Effective storage (Irrigation Department)13,140ac-ft−33.4%
Effective storage, % of active storage (Irrigation Department)34.6%−17.3 pts

Navakiri reservoir

Effective storage (Irrigation Department)10,908ac-ft−29.8%
Effective storage, % of active storage (Irrigation Department)21.0%−8.9 pts

Nuwara Wewa reservoir

Effective storage (Irrigation Department)17,500ac-ft−9.1%
Effective storage, % of active storage (Irrigation Department)49.9%−5.0 pts

Padaviya reservoir

Effective storage (Irrigation Department)19,250ac-ft−36.0%
Effective storage, % of active storage (Irrigation Department)23.8%−13.4 pts

Pallan Oya reservoir

Effective storage (Irrigation Department)24,110ac-ft+14.8%
Effective storage, % of active storage (Irrigation Department)25.8%+3.3 pts

Panama reservoir

Effective storage (Irrigation Department)0ac-ft–
Effective storage, % of active storage (Irrigation Department)0.0%−13.0 pts

Pannalgama reservoir

Effective storage (Irrigation Department)9,374ac-ft−35.7%
Effective storage, % of active storage (Irrigation Department)37.4%−20.8 pts

Parakrama Samudraya reservoir

Effective storage (Irrigation Department)56,500ac-ft+30.6%
Effective storage, % of active storage (Irrigation Department)55.9%+13.1 pts

Pavatkulam reservoir

Effective storage (Irrigation Department)8,750ac-ft−9.1%
Effective storage, % of active storage (Irrigation Department)33.0%−3.3 pts

Peramaduwa tank reservoir

Effective storage (Irrigation Department)793ac-ft−58.9%
Effective storage, % of active storage (Irrigation Department)24.2%−34.7 pts

Radella reservoir

Effective storage (Irrigation Department)33ac-ft−54.2%
Effective storage, % of active storage (Irrigation Department)1.6%−2.0 pts

Rajangana reservoir

Effective storage (Irrigation Department)69,640ac-ft+24.1%
Effective storage, % of active storage (Irrigation Department)90.9%+17.7 pts

Rajendrankulam reservoir

Effective storage (Irrigation Department)179ac-ft−6.3%
Effective storage, % of active storage (Irrigation Department)21.1%−1.4 pts

Rambakan Oya reservoir

Effective storage (Irrigation Department)15,789ac-ft+10.9%
Effective storage, % of active storage (Irrigation Department)36.7%+3.6 pts

Ridiyagama reservoir

Effective storage (Irrigation Department)24,875ac-ft+135.6%
Effective storage, % of active storage (Irrigation Department)100.0%+56.8 pts

Rottikulama reservoir

Effective storage (Irrigation Department)52ac-ft−95.8%
Effective storage, % of active storage (Irrigation Department)1.0%−23.0 pts

Rugam reservoir

Effective storage (Irrigation Department)3,695ac-ft+20.5%
Effective storage, % of active storage (Irrigation Department)19.9%+3.4 pts

Saddhathissa reservoir

Effective storage (Irrigation Department)931ac-ft−12.4%
Effective storage, % of active storage (Irrigation Department)87.6%−12.4 pts

Senanayaka Sam reservoir

Effective storage (Irrigation Department)126,880ac-ft−61.0%
Effective storage, % of active storage (Irrigation Department)16.5%−25.7 pts

Sorabora reservoir

Effective storage (Irrigation Department)8,438ac-ft−35.8%
Effective storage, % of active storage (Irrigation Department)50.3%−28.1 pts

Sugaladewi reservoir

Effective storage (Irrigation Department)1,228ac-ft−34.6%
Effective storage, % of active storage (Irrigation Department)54.7%−28.9 pts

Tabbowa reservoir

Effective storage (Irrigation Department)2,605ac-ft−65.9%
Effective storage, % of active storage (Irrigation Department)17.4%−33.5 pts

Tampitiya reservoir

Effective storage (Irrigation Department)140ac-ft−28.6%
Effective storage, % of active storage (Irrigation Department)7.1%−2.8 pts

Thissa wewa reservoir

Effective storage (Irrigation Department)2,585ac-ft−20.6%
Effective storage, % of active storage (Irrigation Department)74.2%−19.2 pts

Thumpankerny reservoir

Effective storage (Irrigation Department)44ac-ft–
Effective storage, % of active storage (Irrigation Department)3.7%+3.7 pts

Thuruwila tank reservoir

Effective storage (Irrigation Department)6,150ac-ft−9.5%
Effective storage, % of active storage (Irrigation Department)75.1%−7.9 pts

Tissa wewa reservoir

Effective storage (Irrigation Department)3,460ac-ft+97.7%
Effective storage, % of active storage (Irrigation Department)100.0%+49.1 pts

Unnichchai reservoir

Effective storage (Irrigation Department)4,354ac-ft−52.6%
Effective storage, % of active storage (Irrigation Department)7.9%−8.8 pts

Usgala Siyabalan reservoir

Effective storage (Irrigation Department)17,485ac-ft+15.8%
Effective storage, % of active storage (Irrigation Department)87.5%+11.9 pts

Uyanwewa reservoir

Effective storage (Irrigation Department)182ac-ft+130.4%
Effective storage, % of active storage (Irrigation Department)100.0%+55.1 pts

Vakaneri reservoir

Effective storage (Irrigation Department)8,901ac-ft−31.0%
Effective storage, % of active storage (Irrigation Department)65.9%−29.7 pts

Vendrasan reservoir

Effective storage (Irrigation Department)5,400ac-ft−54.2%
Effective storage, % of active storage (Irrigation Department)26.6%−31.5 pts

Viyathikulam reservoir

Effective storage (Irrigation Department)933ac-ft–
Effective storage, % of active storage (Irrigation Department)52.3%+52.3 pts

Wahalkada reservoir

Effective storage (Irrigation Department)21,975ac-ft−16.0%
Effective storage, % of active storage (Irrigation Department)53.7%−10.2 pts

Wan Ela reservoir

Effective storage (Irrigation Department)2,332ac-ft+9.4%
Effective storage, % of active storage (Irrigation Department)100.0%+5.5 pts

Weerawila reservoir

Effective storage (Irrigation Department)3,225ac-ft−47.1%
Effective storage, % of active storage (Irrigation Department)31.1%−27.7 pts

Weheragala reservoir

Effective storage (Irrigation Department)8,047ac-ft−61.2%
Effective storage, % of active storage (Irrigation Department)14.9%−23.5 pts

Wemedilla reservoir

Effective storage (Irrigation Department)4,367ac-ft+4.7%
Effective storage, % of active storage (Irrigation Department)100.0%+3.2 pts

Yan Oya reservoir

Effective storage (Irrigation Department)38,104ac-ft+225.0%
Effective storage, % of active storage (Irrigation Department)33.6%+23.3 pts

Yodawewa reservoir

Effective storage (Irrigation Department)5,125ac-ft−20.2%
Effective storage, % of active storage (Irrigation Department)63.5%−16.1 pts

Yudhaganawa reservoir

Effective storage (Irrigation Department)1,763ac-ft0.0%
Effective storage, % of active storage (Irrigation Department)100.0%no change

Major reservoirs

Effective storage (Irrigation Department)1,107,915ac-ft−18.2%
Effective storage, % of active storage (Irrigation Department)38.1%−7.5 pts
Long-term average effective storage for the day (Irrigation Department)1,261,172ac-ft0.0%
Long-term average, % of active storage (Irrigation Department)42.4%no change

Medium reservoirs

Effective storage (Irrigation Department)37,908ac-ft−14.8%
Effective storage, % of active storage (Irrigation Department)43.4%−6.8 pts
Long-term average effective storage for the day (Irrigation Department)43,627ac-ft0.0%
Long-term average, % of active storage (Irrigation Department)49.2%no change

Effective storage (Irrigation Department)

ac-ft, daily. 16 Oct 2026: 765, +553.8% on a year earlier

Series page
Published by the Irrigation Department; read from Irrigation Department: daily water level and storage of major and medium reservoirs.

* Calculated by Macro Lab from the published values.