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Rainwater is a traditional water resource and today taken on a new look because of the world-wide water crisis. The current paper demonstrates the outcomes of the research on the feasibility of rainwater use in high-rise residential envelopes for four Australian cities of Melbourne, Sydney, Perth and Darwin. Different climate patterns and various levels of water demand management measures have been projected, which were discussed in aspects of determination of storage dimension, annual tank water use and reduction in imported water flow. High level water demand technique is a profoundly effective tool for reducing potable water supply, especially coupling with rainwater use. The outputs of this analysis presented that Sydney was much likely to suitable to rainwater use, followed by Perth/Darwin, and then Melbourne. This investigation endeavors to provide the assistance on water services for water authorities and urban planners of Australian cities.