Subject(s): Water supply -- Rain water -- Storage -- Incremental approach, importance of fully involving the community, importance of sanitation and hygiene -- Design capacity -- Sources of water : Rainwater, groundwater, surface water, disinfection after construction, checking the yield of a source -- Raising water : Human powered systems of raising water, wind powered pumps, water powered pumps, engine and motor powered pumps -- Storage : Dams, storage tanks, storage in home -- Water treatment : Screening, storage and sedimentation, filtration, disinfection, aeration and removal of iron, manganese, tastes and odors, removal of salt, removal of fluoride, removal of arsenic -- Piped water distribution : House and yard connections, public water points, pipeline materials, design and laying