Manila: After localized thunderstorms triggered heavy rains and flooding in several areas in Metro Manila last week, Project NOAH (Nationwide Operational Assessment of Hazards) Executive Director Mahar Lagmay on Thursday underscored the urgent need to shift from traditional flood control projects to a broader 'flood management' strategy.
According to Philippines News Agency, Lagmay highlighted that flooding persists due to rapid urbanization, inadequate drainage systems, clogged waterways, and heavier rainfalls linked to worsening climate change. He emphasized the importance of transitioning to flood management strategies rather than sticking to traditional flood control methods. Lagmay stated, "We cannot eliminate the floods here in the Philippines. We cannot eliminate the floods here in Metro Manila. What we can do is lower it so we can better manage it."
He noted that extensive concrete development has diminished the ground's ability to absorb rainwater, leading to faster runoff that overwhelms drainage systems during heavy downpours. Additionally, Lagmay pointed out that many flood control systems were designed decades ago and are no longer sufficient to address current rainfall conditions. Garbage accumulations, clogged drainage systems, and silted rivers have also contributed to worsening flooding in Metro Manila.
Lagmay advocated for 'hybrid solutions' that integrate infrastructure with nature-based interventions to mitigate flooding. These solutions include detention basins, bioswales, rainwater harvesting, tree planting, and preserving open spaces to temporarily store floodwater. He also stressed the need for stricter urban planning, advising against building critical infrastructure and housing in flood-prone, low-lying areas.
Furthermore, Lagmay called for river rehabilitation, dredging, and improved solid waste management to restore waterways' capacity, along with stronger coordination between local governments and national agencies under a watershed approach. He urged the public to remain vigilant as long-term interventions take time to implement.
With the rainy season approaching, Lagmay warned, "The rainy season is approaching, it's already May. When July and August come, our southwest monsoon here in Metro Manila will be very intense. Be careful and follow the law and heed the advisories of your local and national governments."
