Angkor Wat Reflection
The 4th IWA Conference on Rainwater Harvesting and Management

Rainwater for TomorrowWater · Climate · Culture

1–6 September 2026
Phnom Penh & Siem Reap, Cambodia
Hybrid Conference: In-Person + Online Participation
Call for Contributions Book an Exhibition Booth

Welcome to IWA 4 RWHM 2026

Rainwater for Tomorrow:
Water, Climate and Culture

The 4th IWA Conference on Rainwater Harvesting and Management (IWA 4 RWHM 2026) invites global experts, practitioners, and communities to explore innovative and traditional approaches to rainwater management. Moving beyond conventional engineering, we recognize rainwater as a connector of Water, Climate, and Culture.

Hybrid Format: Join us in-person in Cambodia or participate online from anywhere in the world. Free online access for participants from Low and Middle Income Countries (LMIC).

Days 1–4

Conference & Knowledge Exchange
(Phnom Penh)

Days 5–6

Technical & Cultural Tour
(Angkor Wat)

Rain School

Important Dates & Timelines

Plan your participation with these key milestones. International travel requires advance planning for funding, visas, and flights.

Call for Contributions Opens

15 January 2026

OPEN NOW

Abstract Submission Deadline

31 March 2026

Notification of Abstract Acceptance

30 April 2026

Full Paper Submission Deadline

30 June 2026

Notification of Full Paper Acceptance

31 July 2026

Early Bird Registration Deadline

15 July 2026

Regular Registration Deadline

20 August 2026

Conference Dates

1-6 September 2026

Submit Your Contribution Now