Abstract
The current edition of Australian Rainfall and Runoff espouses the design event approach in which a single food is the “event” with which the hydraulic structure is expected to cope during its working life. The uniform rainfall of the selected average recurrence interval requires a temporal pattern before input to a catchment model. Australian Rainfall and Runoff provides temporal patterns for each of eight def ned zones, with 20 specific durations and two classes of average recurrence interval. These patterns are inconvenient to use, especially for other than specif ed storm durations, and at zone boundaries when differently-shaped patterns apply. This paper shows that distinctions between zones and average recurrence intervals are not signif cant. Only two of the 144 temporal patterns for durations 1.5 to 24 h are significant in food design practice, and these are replaced with continuous equations that allow design storm durations to be divided into any number of increments.
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