By Benjamin Cuaresma
MANILA — As the country faces the combined challenges of the southwest monsoon season and lingering El Niño conditions, the Upper Wawa Dam is emerging as a critical infrastructure project aimed at securing water resources and reducing flood risks for millions of residents in Metro Manila and nearby provinces.
Manila Water highlighted the strategic role of the dam following the Philippine Atmospheric, Geophysical and Astronomical Services Administration’s (PAGASA) declaration of the onset of Habagat, emphasizing the need for climate-resilient facilities capable of addressing increasingly unpredictable weather patterns.
Located in Rizal Province, the Upper Wawa Dam was developed to reinforce water supply reliability in the East Zone of Metro Manila and neighboring communities. The facility serves as a major supplementary source to the Angat Dam system, which has long been the primary provider of water for the National Capital Region.
With a production capacity of up to 710 million liters of water per day, the dam is capable of serving more than 700,000 households, equivalent to approximately 3.5 million people. Its large storage capacity allows water to be collected during periods of heavy rainfall and conserved for use during droughts and periods of increased demand.
Officials said the project plays an increasingly important role as climate change places greater pressure on traditional water sources and intensifies the frequency of extreme weather events.
Beyond water supply augmentation, the Upper Wawa Dam has become a key flood mitigation structure for communities across Rizal and eastern Metro Manila. The facility is designed to temporarily store excess runoff during typhoons and intense monsoon rains, helping regulate downstream water flow and lessen the impact of flooding.
The dam’s flood-control function benefits vulnerable areas including the municipalities of Rodriguez (Montalban) and San Mateo in Rizal, as well as the cities of Antipolo and Marikina.
Engineers also highlighted the project’s compliance with international safety and engineering standards, including guidelines established by the International Commission on Large Dams (ICOLD) and the United States Army Corps of Engineers (USACE).
The structure was built to withstand major natural hazards, including powerful earthquakes and severe flooding events. According to project officials, the dam incorporates advanced seismic engineering features and is capable of enduring earthquakes with magnitudes exceeding 8.0 while maintaining structural integrity.
To enhance operational safety, the facility is equipped with modern monitoring instruments that provide real-time data on structural performance, allowing engineers to immediately detect and respond to any potential issues.
“The Upper Wawa Dam demonstrates how modern infrastructure can address both water security and disaster resilience,” said Joe Costales, General Manager of WawaJVCo. “Reliable water access supports households, businesses, and industries, while flood mitigation measures help protect communities and economic activity.”
Covering a watershed area of 262 square kilometers and featuring a reservoir capacity of 120 million cubic meters, the dam incorporates advanced hydraulic systems designed to safely manage large volumes of water. These engineering features help control water discharge, reduce downstream erosion, and maintain stable river conditions during periods of heavy rainfall.
As the Philippines navigates the impacts of shifting climate conditions, Manila Water and WawaJVCo said the Upper Wawa Dam stands as a model for integrated infrastructure development—one that strengthens water security, enhances public safety, and supports long-term economic growth for future generations.
ia/xf
