1–6 September 2026 · Phnom Penh & Siem Reap, Cambodia
The 4th IWA Conference on Rainwater
Harvesting and Management
A landmark event — September 2026
Rainwater for Tomorrow:
Water, Climate and Culture
The 4th IWA Conference on Rainwater Harvesting and Management (IWA 4 RWHM 2026) was successfully held from 1–6 September 2026 in Phnom Penh and Siem Reap, Cambodia. The conference brought together global experts, practitioners, and communities to share innovative and traditional approaches to rainwater management — celebrating rainwater as a connector of Water, Climate, and Culture.
Hybrid Conference: Participants joined both in-person in Cambodia and online from around the world. Online access was provided free of charge, including for participants from Low and Middle Income Countries (LMIC).
Days 1–4Conference & Knowledge Exchange
(Phnom Penh)
(Phnom Penh)
Days 5–6Technical & Cultural Tour
(Siem Reap)
(Siem Reap)