Rainfall trend and its implications for water resource management within the Yarra River catchment, Australia

Shishutosh Barua, Nitin Muttil, A. W.M. Ng, B. J.C. Perera

Research output: Contribution to journalArticlepeer-review


Rainfall is the key climatic variable that governs the regional hydrologic cycle and availability of water resources. Recent studies have analysed the changes in rainfall patterns at global as well as regional scales in Australia. Recent studies have also suggested that any analysis of hydroclimatic variables should be performed at the local scale rather than at a large or global scale because the trends and their effects may be different from one location to the other. Because no studies were found specific to the Yarra River catchment, which is an important catchment in Victoria, Australia, this study performs a spatiotemporal trend analysis on long-term rainfall records at 15 measuring stations within the catchment. The Mann-Kendall test was used to detect trends, and Sen's slope estimator was used to calculate the slopes in both monthly and annual rainfall. Moreover, a cumulative summation technique was used to identify the trend beginning year, and prewhitening criteria were tested to check for autocorrelation in the data. The results showed that the monthly rainfall has generally decreasing trends except in January and June. Significant decreasing rainfall trends were observed in May (among the autumn months of March, April and May) at most stations and also in some other months at several stations. A decreasing trend was also observed in the annual rainfall at all stations. This study indicates that there has been a consistent reduction in rainfall over the catchment, both spatially and temporally over the past 50years, which will have important implications for the future management of water resources.

Original languageEnglish
Pages (from-to)1727-1738
Number of pages12
JournalHydrological Processes
Issue number12
Publication statusPublished - 15 Jun 2013
Externally publishedYes


Dive into the research topics of 'Rainfall trend and its implications for water resource management within the Yarra River catchment, Australia'. Together they form a unique fingerprint.

Cite this