This rural water supply design manual is the first of three related volumes prepared for the use of prospective and actual owners, operators, managements, technical staff, consultants, government planners and contractors of small level three and level two water supply systems in the Philippines. Its purpose is to introduce the key concepts and considerations involved in the design of small waterworks facilities for level two and three systems. For the technical persons, hopefully it will facilitate their work by providing them with a ready resource reference for their everyday use. For the non-technical readers, such as the many who are involved in the management and operation of small water supply systems, hopefully it will be an aid in understanding the design process, giving them a basis for participating in decisions that would enable them to avail more usefully of the services of the technical consultants and contractors they must deal with. Overall, the local and international partners who cooperated in making these manuals possible hope that they will help the participants in the rural water supply sector to understand better the nature of the water supply business, its responsibilities to the stakeholders, and the role of the government agencies and regulatory bodies that seek to help them operate sustainably while protecting the consumers.