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Hi All, 

I am a new member and I am  an architect and arboriculturist, based in Warwickshire. I am looking for some feedback if possible.

I am passionate about both trees and buildings, and in particular am interested in locating trees close to buildings.

There are a number of barriers preventing this, such as :

- the RPA calculation in BS5837

- threat of litigation

- lack of arboricultural knowledge that architects have

 

My doctoral research relates to how these barriers could be moved to allow trees to be located closer to buildings taking advantage of all of the widely known benefits.

Can anyone comment on how the 12x calculation for single stem trees for RPA was arrived at? The calculation seems arbitrary and doesn't appear to necessarily relate to all situations. I am also interested to know if anyone knows the authors of the calculation or how it was arrived at.

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11 hours ago, Gary Winn said:

...Can anyone comment on how the 12x calculation for single stem trees for RPA was arrived at? The calculation seems arbitrary and doesn't appear to necessarily relate to all situations. I am also interested to know if anyone knows the authors of the calculation or how it was arrived at.

I may be wrong, I asked a similar question many years ago...  My understanding was originally they used to use the drip line or height but that could be even more temperamental..  Someone or group of someones came up with a formula that seemed to work.  Pretty sure there has been no actual studies or research. I have never seen any. It is arbitrary and rarely any relation to the real world position of the rooting area. But... it is all we have and does give a starting point. The biggest downside is that many take it as law.. When plainly it is often utter nonsense..

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Dear Ben,

 

Thank you so much for taking the time to respond to my plea.

Once I have found out more detail on the creation of the formula, I will post it here.

 

My understanding so far is that is based on research in the USA. I have also found that Claus Mattheck's work in The Body Language of Trees, correlated structural stability of the tree to the amount of undisturbed RPA.

 

Thank you again

 

Gary

 

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