Angat Dam’s water level remains below normal and continues to drop despite the occasional downpour felt in some areas in Luzon, the weather bureau said.
Water level at the dam, the primary source of water in Metro Manila, was at 188.69 meters on Sunday, 0.29 meter lower than the previous day, according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa).
Angat’s water level reached 190.55 on October 1. It has since gradually dropped.
Pagasa hydrologist Sonia Serrano attributed the decline to a lack of sufficient rainfall over the area of Angat for the past few days. She said a reduced amount of rainfall was expected as the southwest monsoon the weather transitions to the northeast monsoon or amihan, which is associated with lighter amount of rainfall.
Historically, Angat recovers and reaches its normal operating level of 210 meters in December.
Since September, the National Water Resources Board has maintained a water allocation of 40 cubic meters per second (cms) for Metro Manila’s domestic supply and 30 cms for irrigation since September. Prior to this, water allocations for Metro Manila was reduced to 36 cms, while irrigation supply was suspended.
Meanwhile, La Mesa Dam and Ipo Dam, other sources of water supply for Metro Manila, maintained their respective normal levels. La Mesa’s elevation was recorded at 77.98 meters, a measly 0.02-meter drop from the previous day, while Ipo Dam slightly increased by 0.25 meters to 101.14 meters. La Mesa’s normal operating level was set at 78 meters, while Ipo at 101 meters.
Other dams in Luzon have almost reached their respective normal high water levels. On Sunday, Ambuklao Dam’s elevation was recorded at 751.95 meters; Binga Dam, 572.28 meters; San Roque Dam, 275 meters; Pantabangan Dam, 208.88 meters; and Magat Dam, 189.03 meters.
Normal high levels were set at 752 meters for Ambuklao Dam; Binga Dam, 575 meters; San Roque Dam, 280 meters; Pantabangan, 216 meters; and Magat, 190 meters.