AS4970 Draft| Australian Development Tree Protection

Sean Freeman

Please be aware that the draft standard has been released today..you can go to the SAI website and download the pdf for free (you need to register first). http://infostore.saiglobal.com/store...=MSWD4970ATCRD

Please everyone who is envolved in dealing with trees in any way on construction sites read this draft and if you have a comment fill out the comment form found at http://www.standards.com.au/Catalogu...ent%20Form.doc (instructions on how to fill it out and examples are included there) do submit it to the Projects Manager Chandima Nawela/Ashwini Sharma ashwini.sharma@standards.org.au

Even if you feel that the draft is fine without change please submit a comment reflecting that.

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Sean

Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran

treeseer

well i tried to register but it said i was not a member of sai global so cut me off.

i must not be in with the in crowd.

also wondering how they can be selling hardcopy already if the comment period is to go for 2 months--feb 13 it says.

Sean Freeman

That is odd??

The draft is free but there are clear rules about how many copies and how they may be distributed etc...

The final full standard (if and when) will doubtless be around $75 AUS.

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Sean

Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran

Ekka

Document uploaded and attached

Check carefully some new terminology.

What we commonly called the CRZ (Critical Root Zone) is now the SRZ (Structural Root Zone). The calculation for the SRZ is cumbersome and inconsistent with others not using DBH but using stem diameter measured immediately above root buttress.

From P17
Here's a pic of the chart which is easier than the formula.


There's also the RPZ (Root Protection Zone) which for many of us was the TPZ (Tree Protection Zone) however there can be an area further out from the RPZ included in the TPZ called the CPZ (Crown Protection Zone).

Here's how they calculate the RPZ.


Now not always have we had to protect the crown however the CPZ is 1m further out than the crown.

Source P18
Here's the overall for you to get your head around BUT IT DOES NOT SHOW THE SRZ.

Figure 1 Page 14 needs to show the SRZ


Just putting my ideas and objections in red so easier to read.

1/ Figure 1 Page 14 needs to show the SRZ

2/ No compensation or allowance for trees to grow, for example, the range of 20% to 80% of SULE is 9 x DBH for good vigour tree. If the tree is only at 25% of it's life expectency and has a 0.3m DBH trunk but could grow to 1m DBH then here's the sums.

For a 0.3m DBH tree it would get a 2.7m RPZ which is 22.9m2
For a 1.0m DBH tree it would get a 9.0m RPZ which is 254.47m2

So how could the "saved" smaller tree expect to mature when it receives less than 10% of the mature trees allocated land? This is an oversight and needs to be addressed, causes problems and early decline, interference with buildings and structures etc. So they build 1m outside the CPZ of a 21% old tree, what happens down the track as the crown grows?

3/ The calculation for the SRZ is cumbersome (the formula is a shocker!) and inconsistent with others not using DBH but using stem diameter measured immediately above root buttress.

Attached Images

	srz.JPG (50.8 KB, 355 views)
	rpz.JPG (55.4 KB, 352 views)
	tpz.jpg (93.2 KB, 349 views)

Attached Files

AS4970 Protection Of trees On Development Sites.pdf (1.06 MB, 60 views)

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Ekka

Sean, that link and the one in the PDF is dead!

I have sent an email off about it.

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Sean Freeman

Yes so did I...... :>(

__________________
Sean

Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran

Ekka

Just received a phone call from Ashwini and she said she'll be rectifying the broken link soon and OK'd for me to distribute copy of AS4970 which is in post 4 above.

She actually emailed me a clean copy without my down loaded details.

The idea is that all comments get pooled together on their hub for appraisal and discussion.

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MTS247

The formula and the graph seem to give diferent results.

Also no tree can have SRZ dia greater than 5m acording to the graph.

Ekka

Highly likely and probable.

It's been noted that as trees gain mass that mass becomes part of the stability and anchorage.

How hollow - pull test - stability tests - Wessolly - Brudi

In all the failures (blow overs etc) that I have seen I have not seen soil upheaval further than 2.5m from the trunk of the tree, that includes huge failed Brush Box in Lamington National Park (perhaps 2m+ DBH and 60m tall)

Of course there may be exceptions.

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Sean Freeman

Here is the feedback form.
Public Comment Form.doc

__________________
Sean

Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran

Quintrex

We're supposed to use dia just above root buttress, yet Table 2 states DBH?

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Heightmaster

Sean Freeman

Just a reminder that if you want to comment you have less than two weeks to do so.

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Sean

Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran