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#1 2019-02-28 05:40:07

Evan
Administrator

Landslip Site Rehab #1 in SE Queensland

FB link: https://www.facebook.com/groups/vetiver … 067762760/

This is a photo-log of a landslip remediation site in Maleny, Queensland. This document details why this area is prone to landslides and slips: http://www.barunglandcare.org.au/Resour … 0Sheet.pdf

This area is part of larger historical landslips that have the potential to increase turbidity into a creek that feeds into a water source for the township. The area is being planted with native trees for long-term control.

The site was a debris/mud slide that was going to be worked on until a 100mm+ rain event caused another slide. The works had not begun and no Vetiver was lost. This puts the site and Vetiver at high risk of failure if it slides again.

A Before/After of the debris slide:

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Shots of the site:

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Vetiver slips were coated in cow manure slurry before planting:

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The top 3 rows are planted. Above the spring/mudslide the soil is cracked and extremely dry. Some rows are cut short due to tension cracks or basalt rocks:

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Further rows are placed directly into the wet soil/mud:

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Another day continues more row placement into the slow-moving mudslide:

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Planting includes contouring across and out of the wettest area:

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Another day adds rows at the bottom of the slide and more outside of it:

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At this point, work was moved to Landslip Site #2 and no more plants were installed. 4 weeks later, we visited the site for a follow-up and here a some pictures in no particular order:

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There has been some soil movement as demonstrated in this photo where part of the wall has collapsed and crushed some slips (which have survived):

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Updates to come.

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#2 2019-02-28 05:40:19

Evan
Administrator

Re: Landslip Site Rehab #1 in SE Queensland

Update today which is 14/3/2019 (don't look at post date).

3 out of 572 bareroot slips have died. They were sitting in spring-fed water that smelt foul so potted up plants may have done better there (first picture illustrates the water). The mudslide is doing well which is also constantly wet but is probably refreshed more often with the spring.

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#3 2019-03-19 07:24:32

Evan
Administrator

Re: Landslip Site Rehab #1 in SE Queensland

20 extra plants planted on the 15th to replace the 3 dead and close any gaps.

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#4 2019-03-19 11:42:31

Evan
Administrator

Re: Landslip Site Rehab #1 in SE Queensland

200mm in 2 hours then another 40mm two days later and there have been two obvious debris slides. The one to the right of frame is where the Vetiver was planted, the larger one to the left of centre frame had no Vetiver but had been planted at the top. There are multiple locations across the scarp that could have further failures.

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#5 2019-03-22 06:09:57

Evan
Administrator

Re: Landslip Site Rehab #1 in SE Queensland

Visited the site to find that the damage had been directly beside the Vetiver planting and had minorly affected the Vetiver in parts. Some rows have changed height or angle and more tension cracks have opened up. We didn't lose 1 plant to the slide though some may die after being covered by other debris. These could be replanted in Spring.



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This row has dropped the most and is the closest end to the slide.
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#6 2019-03-22 16:52:03

admin
Admin

Re: Landslip Site Rehab #1 in SE Queensland

Considering the age of the plants they did well to survive the intensity and quantity of folks
Rain

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#7 2019-03-23 01:04:35

Evan
Administrator

Re: Landslip Site Rehab #1 in SE Queensland

The slide from a different angle.

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Considering the age of the plants they did well to survive the intensity and quantity of ... Rain

I'm wondering that once the material has been removed from the site from a slide, the only thing left is dense clay and should be more stable. You can see what's left in this picture (https://i.imgur.com/2hb4Xvq.jpg) and that's what I was planting into with the Vetiver, a thick white clay. The only movement in the Vetiver is where the layer of soil above the clay remained. I can't say that layer is 'topsoil' as the actual topsoil likely washed off years ago. Using the soil horizons, I assume it's a mix of different subsoils as what is there it's also a type of hard, cracking clay above the white clay.

To really secure this site, it appears hedgerows will have to push back behind the fence line a significant way as slumping is present in parts of the paddock as well. I don't think the treating of slides after they happen will be the right way to do this though I'm sure the catchment group are aware of this. There are property boundary issues and access to pasture for those owners but that is not great for the 'big picture'.

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