Magat Dam releases water due to ‘Bising’

Published April 20, 2021, 10:54 AM

by Ellalyn De Vera-Ruiz

The Magat River Integrated Irrigation System Dam and Reservoir Division (MARIIS) started releasing water from Magat Dam in Isabela at 6 a.m. on Tuesday, April 20, as a precautionary measure against the possible threat of typhoon “Bising” (international name “Surigae”).

Magat Dam (NIA-MARIIS-DRD-Flood Forecasting and Warning System Dam Operation / FILE PHOTO / MANILA BULLETIN)

“Radial gate #4 open with one-meter opening at 0600H, April 20, 2021,” the MARIIS said in a notice of dam discharge warning issued on Tuesday morning.

The MARIIS has provided a 24-hour lead time before the opening of one of the dam’s spillway gates.

As “reservoir elevation needs to be lowered,” the MARIIS said on Monday, April 19, an estimated 200 cubic meters per second of water will be discharged “in anticipation of the expected heavy inflow due to typhoon Bising.”

Magat Dam’s water level was at 190.22 meters, based on the monitoring of the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) around 6 a.m. Tuesday.

It is 2.78 meters short of its 193-meter spilling level.

The regulation of outflow from Magat Dam is done to mitigate potential flood damage to the downstream communities.