Government projects quantity of water in Angat Dam is still sufficient in meeting this month’s water supply needs of Metro Manila which sources about 90 percent of its water from that facility.
Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) senior hydrologist Max Peralta said the agency’s monitoring showed water level of Angat at 190.29 meters as of 6 a.m. Thursday (April 3) — still above the dam’s 190-meter rule curve which National Water Resources Board (NWRB) set for this date as thedesired water level to satisfy the dam’s purposes.
“Angat’s water level isn’t critical yet,” he said, describing water elevation there as still “normal.”
He said Angat can provide domestic water to Metro Manila up to July this year, even if it won’t rain there until that month, as long as withdrawal of water from the dam is in line with daily rule curve thresholds NWRB set.
NWRB earlier set such daily minimum and maximum thresholds to control water withdrawal in Angat so there can be domestic water supply for Metro Manila, he said.
The lowest threshold is 180 meters equivalent to some 390 million cubic meters of water in the dam, he noted.
“Release of water from Angat must be prioritized for domestic water supply of Metro Manila,” he continued.
Angat water is also used for irrigation and power generation, he said.
PAGASA said Angat’s water level this year began lowering in February due to absence of rainfall there.
“Further lowering of Angat’s water level can be expected during the dry season when there’s more evaporation,” said PAGASA hydrologist Elmer Caringal.
He said PAGASA’s computations show even if water level there dips by almost 30 cm. daily, latest available monitoring data indicate Angat will still have sufficient water for Metro Manila this month.
“We expect rains to begin by the third week of May so that’ll help replenish water supply in Angat,” he said.
However, PAGASA continues urging Metro Manila residents to rationalize their use of water so this commodity can be conserved for future utilization.
“Use water wisely,” Caringal said.
He added people must make water conservation a habit.
Built and first operated in the 1960s, Angat Dam impounds water from Angat River.
Operation in the dam prioritizes domestic water supply over irrigation if the reservoir’s water level drops below the day’s lower rule curve threshold. PNA