The Australian continent experiences high interannual climate variability, particularly in precipitation and rainfall rates. The variability in inflow to dams and catchments observed in long time over Tasmania. The main objective of this study is to examine trends by using Mann Kendall’s tau test in seasonal streamflow data of Tasmania. These results indicate that Tasmania is generally getting drier. Systematic patterns were found in the trends of mean seasonal streamflows of Tasmania. These trends might be a part of the result of a climate change. Precipitation is a significant but not the only cause of streamflow changes in Tasmania. This analysis provides clear understanding and existing relation relationship between rainfall and streamflow because rainfall is a chief integrator of runoff streamflow. It will beneficiary for socio-economic activities and forecasting in Tasmania.
