Investigations into solutions for addressing managed aquifer recharge clogging

underway

Managed aquifer recharge (MAR) is the intentional recharge of water into groundwater aquifers for subsequent recovery or environmental benefit. It can improve water security and provide a drought reserve, as water stored underground won’t evaporate like water stored in surface dams. The successful and sustainable operation of MAR schemes will help support a secure water future for Australia. Previous studies have found that clogging is a key risk for MAR schemes and a reason why MAR schemes become less effective over time. Understanding the causes and prevention of MAR scheme clogging is vital to the long-term success of these schemes. The CSIRO is undertaking a national investigation into the causes of, and operational solutions to, clogging of MAR systems. This project aims to increase understanding of the factors that lead to or prevent clogging of MAR schemes. This will help ensure existing and new MAR schemes deliver on their promise to increase water security and offer a good return on the initial investment and maintenance costs. Clogging of the infrastructure used to recharge can reduce how much water can be recharged into an aquifer. Clogging can also cause harmful pressure build-up or other damage to the aquifer. In extreme cases, clogging may result in the abandonment of a scheme. To ensure the long-term sustainability of MAR schemes, it is important to understand how different operational factors can help maintain the MAR system. Through 4 case studies in different locations and different types of MAR schemes, CSIRO investigators are analysing factors that contribute to or prevent clogging. They are also analysing the impact of clogging on scheme performance. The assessment will: Project recommendations will help scheme operators, investors and the water industry reduce factors that cause clogging. This will help to ensure the sustainability and viability of MAR schemes. The findings will apply to all new and existing MAR schemes across Australia. The partners for this project are Seqwater, South Australian Water Corporation and Lake Breeze Winery.