Dartmoor rehydration

Diversion banks stop erosion, increase infiltration Diversion banks constructed above the head of a gully has halted the progress of the gully head. Water is now being held in the landscape by the banks, instead of running into the gully system improving water...

Gully days

Gully field days show landholderswhat’s involved in remediation Department of Agriculture and Forestry Principal Extension Officer Bob Shepherd explains some of the principles of gully remediation. Griffith University Associate Professor Andrew Brooks. LDC has...

Monitoring Update

Monitoring keeps track of work and keeps the work on track By MERI OfficerMarc McConnell Monitoring project activities helps keep track of milestones and monitor progress towards pre-defined project outcomes. It also determines which techniques succeed, which ones are...

Gully prioritisation

Prioritising BBB gullies for remediation LDC and Griffith University mapped gullies in the BBB to help prioritise gully rehabilitation projects. Ground verification work has also been completed to keep the project on track to tackle gully hotspots. NQ Dry Tropics’...

UNESCO visit

One of the helicopters carrying UNESCO visitors touches down at Glen Bowen Station. The McCormack family waits in the shade of a nearby tree to greet them. Delegates standing on a gully control site, remediation works can be seen on the right. Landscape Remediation...

 

Reef regulations - grazing, standard conditions

  1. For land in good or fair condition (more than 50 per cent ground cover at 30 September), continue using measures to maintain land condition.
  2. For land in poor condition (less than 50 per cent ground cover at 30 September), steps must be taken to improve land condition.
  3. For land in degraded condition (less than 20 per cent ground cover at 30 September), steps must be taken to improve land condition OR prevent areas from further degrading or expanding.
  4. Keep records of measures taken and also of agricultural chemicals, fertiliser and mill mud or mill ash applied to land.
KEQ #8

KEQ #7
KEQ #6

KEQ #5

KEQ #4

The LDC project monitors four gully sites (represented in this table) with gold standard equipment and analysis, carried out by CSIRO.

Results have been compiled in a preliminary report from Bartley et al (2020), with the final report expected to be released by the end of 2020. The preliminary report shows all four sites have indicators of improvements, notably the Strathbogie and Mt Wickham sites.

KEQ #3

*The Exploring New Incentives activity area has provided an opportunity for graziers to adopt improved land management practices through a range of activities. For some of these properties, it was the first time they signed contracts for on-ground works.

KEQ #1

Figure 1. Total fine sediment reduction by project type and erosion source. Inset shows the proportion of the total project area for each project type.

These estimates have been calculated using two methods: 

1) The pollutant reduction component of the Alluvium/Great Barrier Reef Foundation (GBRF) investment tool for hillslope and streambank erosion management projects; 

2) The Reef Trust Gully Toolbox method for gully erosion management projects. The LDC Water Quality Report 2020 (Waterhouse et al., 2020) highlights that a number of assumptions underlay these calculations, therefore these figures should be treated as the best available estimate of sediment reductions to date.

Preventing sediment from reaching the Great Barrier Reef

Each wet season sediment is washed into local waterways and out to the Great Barrier Reef (GBR). 

Most sediment is very fine, and can stay suspended for a long time and can travel great distances. Valuable topsoil is lost from production, and increased concentrations on the reef can be harmful to seagrasses and corals. 

Landholders in the BBB have completed 69 on-ground water quality practice changes, and it is estimated that these have contributed a fine sediment reduction of 6,154 tonnes per year from reaching the GBR. 

Of this, approximately half of the sediment savings are attributable to grazing land management changes on hillslopes and streambanks, and the other half as a result of gully remediation treatments across a broad range of scales, as shown in the graphs above. 

The table below also highlights the relatively small area of intervention in the gully management projects compared to the large sediment savings that these can achieve - 60 per cent of the sediment savings over only 4 per cent of the project area.

Table 1. Estimated sediment reductions (tonnes) from projects completed in the LDC Project to date.

KEQ #2

*GLMWW = Grazing Land Management Wire and Water