Author(s): J. H. Green; F. M. Johnson; C. The
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Keywords: Design rainfalls; Generalised Least Squares Regression; Rainfall data; IFD dat
Abstract: The current Intensity-Frequency-Duration (IFD) estimates were developed by the Australian Bureau of Meteorology 20 years ago using information from the Bureau's network of rainfall stations, adopting statistical techniques considered appropriate at the time and with a focus on the longer duration IFDs. The Bureau is currently revising the IFD estimates with considerable emphasis being placed on the derivation of IFD estimates for sub-daily durations. Firstly, the Bureau's network of pluviograph stations has been significantly augmented by data from the networks operated by large urban water utilities. Secondly, the revision is adopting more statistically rigorous techniques including the use of partial duration series analysis for the estimation of IFDs with Average Recurrence Intervals more frequent than ten years and the adoption of a Generalised Least Squares Regression approach for deriving sub-daily rainfall statistics from daily read data. This paper will present the work being undertaken in revising the short duration IFD estimates.
Year: 2011