Glossary


At the end of each definition in this Glossary there is a number in brackets. This indicates the number of the Study Session where the term is first used in this OpenWASH module.

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D

defluoridation

removal of excess fluoride from water (5)


diffuse pollution

pollution from non-point sources (4)


diffusion

process by which something moves naturally from a region of high concentration to one of low concentration (11)


disease outbreak

unexpected rise in the number of cases of a disease (14)


disinfection

elimination of micro-organisms that can cause disease (5)


distribution mains

pipes that take water from a service reservoir to other areas for use (1)


drinking water ladder

steps in improvement of quality of water supply (3)


drinking water standards

set of limits for the amounts of specified substances in drinking water (9)


drip-feed irrigation

form of irrigation where water is put at the base of a plant, using narrow pipes (1)


drought

lack of rain that lasts for a long period of time (14)



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