Luzon’s major dams have gained substantial amounts of water after weeks of torrential rain, giving the country a stronger buffer against the drier conditions that could accompany a potentially strong El Niño.
Water elevation at nine major dams monitored by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) on Monday, August 24, was markedly higher than levels recorded on August 3, with the biggest increases seen at San Roque, Angat, Magat, and Pantabangan.
The gains are particularly significant for agriculture, as Angat in Bulacan, Magat between Isabela and Ifugao, and Pantabangan in Nueva Ecija are among Luzon’s key sources of irrigation water for rice production.
San Roque Dam in Pangasinan posted the largest increase, with its water elevation rising 48.12 meters to 274.97 meters from 226.85 meters on August 3. The multipurpose dam draws water from the Agno River and supports power generation, flood control, and irrigation.
Angat’s elevation climbed 36.36 meters to 191.77 meters from 155.41 meters. The dam is also critical to Metro Manila’s water supply.
Its current level is above the 180-meter normal operating threshold, below which irrigation releases are halted, and well above the 160-meter critical level associated with potential domestic water shortages.
Magat gained 14.55 meters to 178.69 meters, while Pantabangan rose 12.96 meters to 190.71 meters.
The sharp recovery comes after persistent Habagat rains that intensified from late July and were further strengthened by tropical cyclones and successive weather disturbances in August.
The additional storage provides greater flexibility for irrigation and water supply planning, but the gains are not a reason for complacency.
Reservoir levels will ultimately depend on how much rainfall is retained in the coming months, particularly if El Niño brings prolonged dry spells that could quickly draw down supplies.
