Water is a fundamental aspect of all living things. Since 1900, overall water consumption has increased ten times. Consequently many countries are feeling the effects of water shortage and are starting to exceed local limits of supply (www.savewater.com.au, 2003). Forecasts have shown that freshwater supply from increases in the capacity of the expanding built environment to harvest rainfall, will not increase enough to provide for population growth in the future, due to disproportionate demand. Water storages are currently dropping to concerning levels in many areas, while in other areas flooding serves as a poignant reminder of the dynamism of our weather systems.