An overview of Monitoring and Evaluation for the LDC project
First large-scale gully project a success
The Mt Wickham site was selected as the LDC project’s first large-scale gully remediation site.
The gully catchment treatment size was 3.03 ha and the control site size was 14.14 ha.
The area underwent significant earthworks with tunnels excavated and the area reshaped and compacted with a bulldozer to a gradually sloping shape to reduce the velocity of water moving off the site.
A series of rock chutes were constructed to manage water flow, and diversion banks were installed to divert runoff.
Revegetation included 538kg seed planted, including deep-rooted legumes, canopy species, pasture grasses, legumes and cover crops.
Remediation was carried out in 2018 allowing two wet seasons of treatment data to be collected.
A number of statistically significant positive indicators are demonstrating that the Mt Wickham treatment is effective, independent of natural climate variability.
The cover and biomass of the hillslope and gully walls have significantly improved, as well as the water quality and total suspended sediment concentrations.
While land condition overall is showing an improvement from before treatment, it does remain fragile and will require careful management and ongoing monitoring.
The total suspended sediment (TSS) levels at the control site and the treatment site are dropping from the baseline measurement, one year after treatment and two years after treatment.
*Information sourced from the CSIRO report.