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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B

back-siphonage

the drawing of external water into a water main as a result of a reduction in pressure in the water main (7)


bacteria

single-celled organisms ranging in size from 0.5 to 5.0 µm (2)


biodegradation

the breaking down of complex substances into simpler substances by micro-organisms (11)


Bishan Gari

a water purifying powder mixture comprising a coagulant/flocculant and a disinfectant, available in Ethiopia (10)


block (water supply)

a given amount of water for which there is a certain water tariff (13)



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