Alluvial gully erosion is one of the most significant sources of fine sediment entering the Great Barrier Reef lagoon. Addressing this challenge is critical for improving reef water quality. At Mt Wickham Station, a high-priority site in the Normanby catchment, Alluvium delivered a major gully rehabilitation project using a design-and-construct approach tailored to the region’s unique geomorphic conditions.

The rehabilitation works were designed to stabilise severely eroding alluvial gullies and withstand the harsh climatic variability of northern Queensland. This approach was tested during the extreme rainfall event of February 2019—one of the most intense in recent history. Despite these conditions, the works remained intact and functional.

Monitoring has since confirmed that the project has delivered one of the most substantial reductions in fine sediment export from any remediated gully in the GBR catchment to date. This outcome highlights the effectiveness of our approach and demonstrates the value of investing in well-designed, robust, and site-specific gully rehabilitation solutions.