Super Typhoon Pepito: Luzon Dams Open Gates to Manage Rising Water Levels

Four dams in Luzon opened gates on Sunday morning to release water due to impending heavy rains from Super Typhoon Pepito (international name: Man-Yi).

The dams affected are Ambuklao, Binga, San Roque, and Magat.

As of 8 a.m., Ambuklao Dam in Benguet had four gates open at 2.0 meters. Its water level reached 750.42 meters, close to the 752-meter spilling level.

Binga Dam, also in Benguet, had four gates open at 2.0 meters, with its water level at 572.29 meters, nearing the 575-meter spilling level.

At San Roque Dam, which straddles Pangasinan and Benguet, two gates were opened at 3.0 meters. Its water level was 277.17 meters, approaching the 280-meter spilling level.

– What are the main risks associated with dam overflow during severe weather events like Super Typhoon Pepito?

Interview with Dr. Rizalito Alonzo, Hydrology Specialist, on Dams Preparedness amid Super Typhoon Pepito

News Directory 3: Thank you for joining us today, Dr. Alonzo. With Super Typhoon Pepito approaching, could you explain the significance of the decision to open the gates of the Ambuklao, Binga, San Roque, and Magat dams?

Dr. Alonzo: Thank you for having me. The primary purpose of opening the gates at these dams is to manage water levels proactively and mitigate potential flooding in the downstream areas. Given the forecasted heavy rains from Pepito, this is a critical step to ensure that the water levels do not reach their maximum spilling levels, which could lead to uncontrolled overflow.

News Directory 3: Can you detail the current water levels at these dams and what they indicate in terms of safety and risk?

Dr. Alonzo: Certainly. As of 8 a.m. on Sunday, Ambuklao Dam had its water level at 750.42 meters, just shy of the 752-meter spilling level. Binga Dam is at 572.29 meters, nearing its 575-meter limit. San Roque is at 277.17 meters, closely approaching the 280-meter spilling level. Lastly, Magat Dam stands at 181.93 meters, below its 193-meter threshold. These levels indicate that if we do not act now, heavy rains could rapidly push these dams to critical overflow points, presenting significant flood risks.

News Directory 3: PAGASA has warned of heavy rainfall expected in the region. How does this intensify the situation for the dams and surrounding communities?

Dr. Alonzo: Heavy to intense rains, with accumulations of 100-200 mm, can dramatically increase the inflow into these reservoirs. The dams are designed to handle significant volumes of water, but an influx of that magnitude, especially when combined with existing water levels, can be overwhelming. This is why monitoring and releasing water is crucial—it helps maintain balance and prevents dam failure and flooding in communities downstream.

News Directory 3: What additional measures should residents and local authorities take in light of this situation?

Dr. Alonzo: Communication is key. Residents in flood-prone areas should stay updated on weather advisories and heed local warnings. Local authorities must continue to monitor and facilitate evacuations if necessary. People should also prepare emergency kits, have a communication plan, and know their evacuation routes. Additionally, ongoing assessments of drainage systems and public infrastructure will be vital to reduce risk.

News Directory 3: Thank you, Dr. Alonzo, for sharing your insights on this urgent matter. Any final thoughts for our readers?

Dr. Alonzo: Stay vigilant and prioritize safety. Super Typhoon Pepito poses real threats, and preparation can mitigate its impacts. Follow updates from PAGASA and local agencies, and do not hesitate to take action if advised to evacuate. Together, we can navigate this challenge effectively.

News Directory 3: Thank you for your time, Dr. Alonzo. Your expertise is invaluable in understanding the challenges we face with the impending typhoon.

Magat Dam, which spans Ifugao and Isabela, also opened two gates at 3.0 meters, with its water level at 181.93 meters, just below the 193-meter spilling level.

PAGASA warned that Pepito will bring heavy to intense rains (100-200 mm) over Benguet, Pangasinan, and surrounding areas on Sunday.

Tropical Cyclone Wind Signal No. 3 was raised over southern Isabela, Pangasinan, Benguet, and Ifugao, according to the PAGASA bulletin at 8 a.m.