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Water Discharge from Major Reservoirs (Cusecs)
Comparison of water release rates from key reservoirs across different districts.
Primary Sources
Multiple reservoirs across Sri Lanka spill amid ongoing heavy rainfall ...
The Department of Irrigation reports that 21 major reservoirs and more than 19 medium-scale reservoirs under its management are currently spilling. Director of Irrigation (Water Management), Engineer H. M. P. S. D. Herath, stated that this situation was recorded as of 6.00 a.m. today (15). Among the major reservoirs currently spilling are Rajanganaya, Nachchaduwa, and Yan Oya in the Anuradhapura District; Ambewela in the Badulla District; and Lunugamvehera, Tissa Wewa, Weerawila Yoda Wewa, and Weheragala in the Hambantota District. In addition, reservoirs including Ambakola Wewa, Usgala Siyambalangamuwa, Mediyawa, Magalla, and Deduru Oya in the Kurunegala District; Nalanda and Wemedilla in the Kandy District; Hadapanagala and Alikota Ara in the Monaragala District; Inginimitiya and Tabbowa in the Puttalam District; and Yoda Wewa in the Mannar District are also spilling. As of 6.00 a.m. today, two spill gates of the Rajanganaya Reservoir were opened by three feet each, releasing over 1,600 cubic feet per second (cusecs) of water into the Kala Oya. Similarly, six spill gates of the Lunugamvehera Reservoir were opened by four inches each, releasing over 1,740 cusecs into the Kirindi Oya, while six spill gates of the Weheragala Reservoir were opened by three inches each, releasing over 700 cusecs into the Menik Ganga. At the Alikota Ara Reservoir, three spill gates were opened by three feet each, discharging over 680 cusecs into the Kirindi Oya. Three spill gates of the Yan Oya Reservoir were also opened, with one gate opened by six inches and the remaining two by four inches each. By 6.15 a.m. today, 12 spill gates of the Tabbowa Reservoir were opened, including eight gates at three feet, two gates at two feet, and two gates at one foot. This has resulted in a discharge of 5,480 cusecs into the Mi Oya. Meanwhile, by 7.00 a.m. today, six spill gates of the Inginimitiya Reservoir were opened, with two gates at three feet, two at two feet, and two at one foot, releasing approximately 6,000 cusecs into the Mi Oya. Additionally, two spill gates of the Deduru Oya Reservoir were opened by one foot each, releasing 1,400 cusecs into the Deduru Oya. The Department of Irrigation has advised residents in low-lying areas and those living near riverbanks to remain vigilant due to the prevailing conditions.
Heavy Rain Causes 12 Major Reservoirs to Overflow in Sri Lanka
The Department of Irrigation has reported that 12 major reservoirs and 6 medium-scale reservoirs under its management are currently overflowing due to continuous heavy rainfall. Director of the Water Management Division of the Department of Irrigation, Engineer H.M.D.P.S.T. Herath, stated that several key reservoirs are spilling water, including: Rajjanganaya Reservoir (Anuradhapura District) Sarabora Reservoir (Badulla District) Nallanda Reservoir (Kandy District) Dehuhuwa Reservoir Lunugamwehera Reservoir (Hambantota District) Tissawawa Reservoir Weerawila Reservoir Yoda Ela Reservoir Weheragala Reservoir (Hambantota District) Deduru Oya Reservoir (Kurunegala District) Alikodaar Reservoir (Monaragala District) He further stated that: At Rajjanganaya Reservoir, 8 spill gates have been opened, releasing over 9,300 cubic feet per second (cusecs) into the Kala Oya. At Sarabora Reservoir, 5 spill gates (opened by 2 feet each) are releasing over 500 cusecs into the Mahaweli River. Nallanda Reservoir is releasing over 1,000 cusecs. Dehuhuwa Reservoir is releasing over 1,300 cusecs. Lunugamwehera Reservoir has 6 gates open, releasing over 4,000 cusecs into the Kirindi Oya. Weheragala Reservoir is releasing over 1,900 cusecs into the Manik River. Deduru Oya Reservoir is releasing over 2,800 cusecs through 2 gates. Alikodaar Reservoir is releasing over 500 cusecs into the Kirindi Oya. In addition, several medium-scale reservoirs—including Thuruwila (Anuradhapura), Bomburu Ella (Badulla), Theberawawa (Hambantota), Sattathissa and Malinpotha (Monaragala), and Mailankulam (Vavuniya)—are also overflowing. The department warned that water release levels may change depending on future rainfall conditions. Residents living near reservoirs and low-lying areas have been urged to remain alert and closely follow instructions issued by the Department of Irrigation, the Department of Meteorology, and the Disaster Management Centre. Back to top button
Heavy Rains Trigger Reservoir Spill Operations Across Several Regions
May 10, Colombo (LNW): Persistent rainfall across many parts of the country has led to a significant rise in water levels at major reservoirs, prompting authorities to activate spill operations at several irrigation tanks to prevent overflow and safeguard infrastructure. The Department of Irrigation confirmed that nine large reservoirs and five medium-scale reservoirs under its management are ...
16 major Reservoirs release water amid heavy rainfall
Sixteen major reservoirs and ten medium‑scale reservoirs under the control of the Irrigation Department are currently releasing water following heavy rainfall, according to H.M.P.S.D. Herath, Director (Water Management Engineer) of the department. Among the major reservoirs releasing water are Rajanganaya in Anuradhapura, Sorabora Wewa in Badulla, Weerawila, Lunugamvehera, and Weheragala in ...
