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 currently discharging excess water following days of intense rain.
Director of Irrigation and Water Management, H.M.D.P.S.D. Herath, stated that among the reservoirs now spilling are the Lunugamwehera Reservoir, Weheragala Reservoir, Rajanganaya Reservoir and Deduru Oya Reservoir.
Officials said six spill gates at the Lunugamwehera Reservoir have been opened, allowing more than 4,000 cubic feet of water per second to flow into the Kirindi Oya. At the same time, six gates at the Weheragala Reservoir are releasing in excess of 1,400 cubic feet of water each second into the Menik Ganga.
Meanwhile, the Rajanganaya Reservoir has opened eight spill gates, sending over 9,300 cubic feet of water per second downstream into the Kala Oya. Four gates at the Deduru Oya Reservoir have also been activated, releasing around 5,500 cubic feet of water per second into the Deduru Oya.
In addition, controlled water releases have begun at the Alikota Ara Reservoir, where three spill gates are currently open and more than 500 cubic feet of water per second is being discharged into the Kirindi Oya basin.
Authorities have advised communities living in low-lying areas and settlements situated downstream of these reservoirs to remain vigilant, particularly in areas vulnerable to sudden rises in water levels. Residents have also been encouraged to pay close attention to official notices and weather updates as rainfall conditions continue to evolve.
The Irrigation Department warned that spill volumes may be revised depending on further rainfall and inflow levels in the coming days, noting that reservoir operations are being monitored continuously to minimise flood risks and ensure public safety.
