The City of Onkaparinga (CoO), located south of Adelaide, faces significant water management challenges due to climate change and population growth. Its primary water sources are the Murray River and a desalination plant. The city aims to reduce its reliance on potable water and explore alternative water sources to support its greening and biodiversity goals.

Alluvium conducted a Water Options Analysis to evaluate current water use and identify sustainable alternatives. The analysis focused on increasing the use of non-potable water sources like recycled water, treated stormwater, and groundwater. It involved reviewing existing systems such as stormwater harvesting and Managed Aquifer Recharge (MAR) schemes, alongside a cost-benefit analysis of four water management options, including smart irrigation systems.

Key findings highlighted the potential to expand and connect non-potable water networks, with alternative water sources offering financial benefits and community gains like cooler, greener environments. The analysis recommended further investigation and design to optimise water use and enhance the city’s resilience.