Abstract
Intensity-duration-frequency curves are traditionally used in the design of urban runoff treatment and management systems. The uniform intensity for a specified duration and return period is selected for a design storm without consideration of the inter-event dry periods between two successive rainfall events. For many purposes, especially those related to urban storm pollution control and receiving water impacts, the cumulative effects of successive storm events must be taken into account. This fact requires the selection of design storms where the minimum inter-event dry periods are adjusted to the effect in question. This paper will discuss the concept of inter-event dry periods for evaluation of design storms derived from a rainfall record. As an example the rainfall record for the city of Odense, Denmark, has been analyzed. The basic statistics as well as the importance of the concept will be illustrated.
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