design storm
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Rainfall usually varies significantly with respect to time and geographical location. A rainfall event is characterised by the duration and the intensity or total quantity of rainwater that is falling down. A design storm on which the design of a wastewater management facility is based is a particular combination of rainfall conditions for which runoff is estimated. The magnitude of a design storm may be expressed as a total quantity of precipitation such as millimetres of rainfall or as a short-term intensity such as millimetres per hour. Intensity can be calculated by dividing the total quantity of precipitation by the catchment area and the duration of the rainfall event.
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