CA measurements - perecentages still valid????

[treesnakey]

I have had a application deemed as not valid as ive used percentages ie 30% crown reduction and not measurements such 1m reduction , while retaining 2m of the crown.

 

I know percentages is no longer acceptable on TPO applications, but have been told its ok for conservation areas.

 

Is this correct?

Edited September 11, 2017 by treesnakey

[daltontrees]

Not correct. It's not a question of law but of best practice, and reductions should be specified according to BS3998, whatever the purpose. e.g. "Reduce height by 3 metres, to leave 8 metres."

 

I am hearing some COuncils are very lax about this but some are very strict. They're probabl;y right to be strict, the idea being they need to eb able to check afterwards and the only measurable thing will be remainign height, spread etc.

[benedmonds]

BS 3998 has only been about since 2010..

 

[Arborist]

The original BS3998 was out in 1966, then 1989 and the current one 2010.

[benedmonds]

17 minutes ago, Arborist said:

The original BS3998 was out in 1966, then 1989 and the current one 2010.

Yes, but I think they changed from percentages in 2010

[daltontrees]

The current BS only refers to % as 30% being the absolute max for thinning, which should not involve any reduction in width or height. I don't have the older BS. One of the problems of % for reduction is that it should be a % of leaf or bud, which never ever equals the % width or height. I believe the older BS did refer to % volume reductions but tehse were impossible to monitor and I can see why their use is discouraged. Except that customers like them becasue they can relate to the  effects on their light, but in situations like that the physiology of the tree is a secondary or even tertiary consideration.