February 2019 | Landholders Driving Change

Let it rain, let it rain, let it rain

For the most part, it was Penny’s from heaven CADE Colls at Glenroc Station wasn’t quick enough to empty the rain gauge when the downpour from ex-Cyclone Penny began on the night of 11 January to get an accurate reading. The gauge was already overflowing...

Rain Roundup – 2018

Rainfall figures for 2018 in the BBB catchment By Land Management Coordinator Rodger Walker IT’S not just the recent weather that makes us want to look back on the year’s rainfall, it’s also the time of year when we reflect. Weather is such an...

Grazing fundamentals

Four ‘grazing fundamentals’ training events planned THE Landholders Driving Change (LDC) Grazing Support Team will this year deliver four events targeting grazing fundamentals. The first of these – a Taking Stock – Pasture Management and Productivity Day – will...

Two demo sites

Would your property make a good demonstration site? RESTORING landscape function, the introduction of technology and innovation in land management and access to cutting-edge monitoring systems, extension packages and training… they are some of the benefits on...

Gully symposium

International Gully Symposium the first in the southern hemisphere THE 8th International Symposium on Gully Erosion will be held in Townsville on 21-27 July. This will be the first ISGE in the southern hemisphere.   Program Themes: Gully erosion processes and...

Borrow a level

Borrow a state-of-the-art laser level to make design easier THE LDC project  has a state-of-the-art laser level to help landholders plan and design surface water management structures. Managing the flow of water is integral to minimising erosion and enhancing grazing...
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

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KEQ #8

 

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.