## 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.

Browse the glossary using this index

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### R

#### rainwater harvesting

process of collecting and storing rainwater (3)

#### raw water

water that has not yet been treated (1)

#### representative sample

sample that has all the characteristics of the matter that it was taken from (12)

#### residual chlorine

(in water treatment) the amount of chlorine left in water after all the pollutants have reacted with it (5)

#### resilience

ability to withstand shock, stress or a natural hazard (5)

#### retention time

(in wastewater treatment) the time that effluent spends in a given environment, e.g. in a sedimentation tank or a stabilisation pond (11)

#### risk

the chance of a hazard occurring (8)

#### risk assessment

process by which the likelihood of harm from a potential hazard is assessed (8)

#### run-off

rainwater that ‘runs off’ the land i.e. flows over the land surface (3)

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