Site Selection and Survey: Local governments selected a rural hospital or school based on factors such as location, water demand, technical capacity, and willingness of local authorities to support the project.

Design of the RFD System: A self- sustaining model for rainwater harvesting was developed, utilizing local labor, skills, and materials for catchment, storage, and drinking water techniques.

Construction of a 20 m3 RFD System: The system was designed to produce 500 liters of water per day, meeting National Drinking Water Quality Standards.

Handover to a Local Management Committee: The committee took responsibility for the system’s operation, supported by one year of technical assistance and data monitoring.

Training: Training was provided for operators, managers, and senior public officials.

Guideline Development: A draft design guideline for RFD systems was created for potential regulatory consideration.

Five 20-cubic-meter Rainwater for Drinking (RFD) systems were successfully established in Viet Nam, Cambodia, Thailand, Lao PDR, and another region of Viet Nam, providing 500 people per site with 1 liter of clean drinking water daily, meeting national standards.

A comprehensive water quality and quantity monitoring mechanism was developed for each system, along with operation and maintenance manuals and education/training plans to ensure stable operation and effective knowledge dissemination.

A sustainable maintenance system was established through community participation, forming local management committees responsible for system operation and providing them with training. The Rain School Initiative gained recognition from the United Nations Water Action Agenda.

International Rain School conferences and camp activities further promoted the concept of rainwater utilization. Detailed design and maintenance reports were prepared for each project site, offering valuable references for future projects.