Big Swamp showing signs of recovery

BARWON Water has reported its remediation efforts have had a positive affect on Big Swamp and Boundary Creek.

The water corporation committed to undertaking the remedial works in September 2018.

Barwon Water acknowledged in June 2017 that groundwater extraction and a drier climate had led to Big Swamp drying out, which led to the activation of acid sulfate soils and ongoing release of acidic water to the lower reach of Boundary Creek.

However, Barwon Water’s first annual report on the remediation shows its early efforts to restore Big Swamp and Boundary Creek have made a difference.

Barwon Water managing director Tracey Slatter said it was rewarding to see signs of improvement.

“The plan represents 18-months of work by Barwon Water, its remediation working group members and technical experts, so it’s great to see it progressing and some early positive signs in our adaptive approach.”

The annual report states there has been a gradual recovery in the groundwater levels of the Lower Tertiary Aquifer.

Sampling of macro-invertebrate also revealed impacts from acidic soil in the Big Swamp were confined to downstream of Boundary Creek.

Barwon Water’s remediation plans involve the installation of hydraulic barriers to maintain surface water flows and groundwater levels within Big Swamp. The designs for the barriers are expected to be complete in 2021, allowing for construction to begin in 2022.

Barwon Water states COVID-19 has affected its ability to engage with stakeholders and the community, but to date has had little impact on the availability of consultants and contractors.

For more information head to yoursay.barwonwater.vic.gov.au/boundary-creek.