Estimation of Sub-hourly and Hourly IDF Curves Using Scaling Properties of Rainfall at Gauged Site in Asian Pacific Region

Synopsis In urban drainage systems, knowledge of short-duration rainfall events can be considered as one of the most critical elements when their hydrological behavior wants to be investigated. The proposed method is based on the scale-invariance theory whose concepts imply that statistical properties of the extreme rainfall processes for different temporal scales are self-related by a scale-changing operator involving only the scale ratio. The methodology is applied to extreme rainfall data obtained at the rain gauges in Asian Pacific countries characterized with different climate conditions. This study indicates that rainfall intensity in time is scaling for extreme events, and hence this concept is shown to provide a useful practical approach to the evaluation of the design rainfall.