Nonlinearity in catchment flood response

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The basic assumptions in various readily available runoff routing models were examined. Case studies in the Little River and Mitta Mitta River catchments in Victoria and the Ord River catchment in Western Australia have highlighted a general inadequacy in the form of the storage-discharge relationship generally assumed in currently available runoff routing models. These case studies showed the form of catchment non-linearity to be more complex than assumed by any of the available models. It was found that the form of the storage-discharge relationship in rural catchments for the full range of discharge is not adequately represented by a single increasing function such as a power function. This inadequacy can lead to significant over-prediction of the flood peaks of extreme events. The are examined.

Original languageEnglish
Pages (from-to)30-38
Number of pages9
JournalCivil Engineering Transactions
Issue number1
Publication statusPublished - 1 May 1989

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