Innovative Australian urban water solutions for New Zealand

Over the last decade in Australia, prolonged drought and increasing demand have prompted the consideration and implementation of a range of centralised and decentralised technologies and methodologies for the development of alternative water resources and demand reduction. The concept of “Fit for Purpose” water is becoming more prevalent as water users seek to apply alternative water supplies for the most appropriate use.

A series of case studies have been developed to gain insight into the drivers for potable water reduction, and the methodologies utilised for the assessment and development of alternative water sources. While these emerging techniques may not be required immediately to augment the water supply in New Zealand, they may warrant consideration in dry areas such as the Eastern areas of NZ where climate change will further impact water availability.

Potable water substitution covers demand reduction and a wide range of technological options including wastewater recycling, sewer mining, grey and black water recycling, rainwater collection and stormwater harvesting. Given the ongoing public resistance to centralised water reuse, particularly for potable applications, more decentralised options represent a promising alternative, particularly for individual water users seeking to increase the security of supply.

An open-minded commitment to long-term future planning is considered vital. Robust data collection, partnering with industry and education initiatives were also highlighted as key success factors in building a diverse water portfolio for the future.