Opening Ceremony & Ministerial Plenary

Background

The formal inauguration of IWA 4 RWHM 2026, bringing together government ministers, diplomatic representatives, and global water leaders to officially launch the conference and set the agenda for the days ahead.

Highlights

• 1Welcome address by the Organizing Committee
• 2Remarks by the Royal Government of Cambodia
• 3Message from IWA leadership
• 4Cultural performance celebrating Cambodia's water heritage

Background

Dr. Kim Hak-su, former Executive Secretary of UNESCAP and a leading voice on sustainable development in Asia, delivers a keynote on rainwater as a transformative resource for climate-resilient development across the Asia-Pacific region.

Highlights

• 1Rainwater's role in achieving SDG 6 across Asia
• 2Policy frameworks linking rainwater to climate adaptation
• 3Lessons from Asia-Pacific national water strategies
• 4Call to action for regional rainwater governance

Speaker

Background

Prof. Moo-young Han of Seoul National University, a world-renowned authority on urban rainwater harvesting, presents cutting-edge innovations that scale from individual rooftops to city-wide water management systems — with evidence from Seoul and beyond.

Highlights

• 1Urban rainwater harvesting at the city scale
• 2Engineering advances in collection, storage, and reuse
• 3Seoul's rainwater management model as a global benchmark
• 4Integration of rainwater into smart city infrastructure

Speaker