The water level at La Mesa Dam dipped below its spilling threshold on Tuesday, August 11, but state meteorologists advise residents along the Tullahan River to remain vigilant against possible flooding.
Data from the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) showed the reservoir’s elevation in Quezon City recorded at 79.99 meters by 5 p.m. Tuesday, falling just beneath its 80.15-meter overflow limit.
The dam had previously breached capacity on Monday, August 10, when monsoon rains pushed its level to 80.17 meters.
Despite the recent decrease, PAGASA warned vulnerable, low-lying communities that risks persist.
“All residents living in the aforementioned areas, especially those near the river banks, are still advised to take necessary precautionary measures,” PAGASA said.
Overflow from the dam flows directly into the Tullahan River system, threatening several areas downstream.
Communities advised to stay alert include Fairview, Forest Hills Subdivision, Quirino Highway, Sta. Quiteria, and San Bartolome in Quezon City; sections of Caloocan City; North Expressway and La Huerta Subdivision in Valenzuela City; and parts of Malabon and Navotas.
PAGASA confirmed it will maintain continuous hydrological monitoring of the dam and keep local authorities and emergency agencies updated.