This work examines the different aspects of, and the issues surrounding, affordable water supply and sanitation. It examines both "software" aspects - people, communities, health, management and institutions - as well as technological considerations such as waste management. The book comprises over 40 papers presented at the 20th WEDC Conference held in Colombo, Sri Lanka in 1994. The material is drawn from countries in all parts of the world. The Water, Engineering and Development Centre (WEDC), based at Loughborough University of Technology, is concerned with education, training, research and consultancy for the planning, provision and management of physical infrastructure for development in low- and middle-income countries.