As rainfall reduces in Australia, harvesting
rainwater is becoming essential, predicated by the
need for sustainable living. Harvesting and storing
rainwater in a tank can not only reduce the need
for fresh water, but also reduce storm water
outflows. Our aim is to research and develop a
digital ecosystem to maximise the utilisation of the
available harvested rainwater. This can be
achieved by considering factors such as current
tank water storage level, predicted rainfall, and the
current and future water needs of the various
appliances in the house. This paper presents the
rationale and the high-level model of such a
digital ecosystem, called lntelliRain. 
Proceedings from Ozwater '09, Australia's national water conference and exhibition. Conference Theme: 'From Challenges to Solutions'