Drainage system

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Terms & Synonyms

Official WHO Definition

A drainage system is a system of drains and apparatus which may be above or below ground. It includes all the drains that carry sewage, industrial waste, rainwater/storm water, or other liquid waste away from a building or process to a given point of discharge (American Society of Sanitary Engineering 2007). It does not include a public sewerage system operated by an authority. All the piping within public or private premises that conveys sewage or other liquid wastes to a point of disposal. It does not include the mains of a public sewer system or a public sewage treatment or disposal plant (WHO 2006).

Other Definitions


Interpretations and Explanations

A drainage system is a combination of pipes and fittings and may include pumps which are generally external to a building, and usually under ground. These drains are used for the purpose of collecting and transporting water borne waste materials to a place where it can be disposed of safely (World Plumbing Council Working Group 2008).


American Society of Sanitary Engineering (2007) Plumbing Dictionary. Sixth Edition WHO (2006) Health aspects of plumbing

WHO Lexicon page (translations and examples)

See also

External Resources


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