Landscape remediation
and restoration

Projects

LDC is helping landholders develop cost-effective designs to remediate gullies and other property erosion features to reduce soil erosion. 

Technical experts are available to visit properties and conduct assessments to determine the most appropriate on-ground solutions.

They can work alongside landholders to design and deliver the treatments, using local contractors where possible, and sharing resources to help reduce costs.

Small-scale gully remediation projects


Is there a small gully, a scalded area or erosion hotspot you want to fix?

Landholders can undertake small-scale gullies and erosion features works that will reduce sediment loss through a range of remediation options. 

Remediation options available to address small-scale erosion features include:

  • diversion banks and water spreading structures to control and manage water flow across paddocks at, before, or after, erosion features;
  • sediment or silt traps to slow water flow and collect sediment;
  • farm road and track works – constructing whoa boys, rehabilitation or re-siting roads;
  • repair degraded areas or preferentially-grazed area through reseeding pasture (can also require fencing or ripping); and
  • fencing and water distribution to better control grazing and improve land condition. Refer to the land management actions for further information about infrastructure options.

Read here how Dan and Katherine Kenny, of Dartmoor, addressed an erosion problem by constructing a series of diversion banks to help increase water infiltration and hold water in the landscape.

Large-scale gully remediation projects


LDC’s Landscape Remediation activity area is trialling large-scale gully remediation approaches to improve water quality, and to determine cost-effective solutions that can be transferred to other projects and catchments.

Four sites have already been established at Mt Wickham, Glen Bowen and Strathmore. All properties are near Collinsville. The Strathmore site will be completed this year.

A fifth large-scale remediation site has been identified on Havilah Station, near Collinsville. A concept design is being developed by Alluvium and Verterra, operating as an Unincorporated Joint Venture. Local contractors will undertake the works.

Read here how the Cormacks, of Glen Bowen, remediated a large-scale gully which has improved vegetation, cover and biomass, soil condition, and reduced runoff.

Landscape rehydration sites


The LDC project has partnered with The Mulloon Institute to help graziers rehydrate their landscapes by returning landscapes to as close as possible to their original state, using rehydration techniques to bank water in the floodplain (hold water in the landscape).

The LDC’s first rehydration project was at the Mt Pleasant Learning Hub.

A second landscape rehydration demonstration site, targeting sediment savings, is being established this year at Weetalaba Station, near Collinsville. For all the details click here.

 

PICTURED RIGHT: The Mount Pleasant Learning Hub project site. Hover the mouse over the image to see how the landscape retained the water that fell in one rain event.

Published by four titlesCirculation - 8,780

Published by two titlesCirculation - 9,965

 

 

 

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

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 #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 #5

KEQ #6

KEQ #7
KEQ #8

Published in The Northern MinerCirculation - 2,041

Published by four titlesCirculation - 8, 780

 

Published by four titlesCirculation - 8,780

 

 

 

 

Published by four titlesCirculation - 8,780

 

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.
Published by two titlesCirculation - 4,006

Published by one titleCirculation - 7,207