Investigations into solutions for addressing managed aquifer recharge clogging

Project overview

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 undertook a national investigation into the causes of, and operational solutions to, clogging of MAR systems.

Goals of the assessment

This project aimed to increase understanding of the factors that lead to or prevent clogging of MAR schemes. This helps 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 analysed factors that contribute to or prevent clogging. They also analysed the impact of clogging on scheme performance.

The assessment:

• investigated and tested management strategies that impact MAR clogging
• recommended possible solutions.

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 apply to all new and existing MAR schemes across Australia.

The CSIRO’s report, Cost effective clogging management during Managed Aquifer Recharge, is now available on their website.

The partners for this project were Seqwater, South Australian Water Corporation and Lake Breeze Winery.