BS5837 Annex C ( stem measurement)

[Bundle 2]

Hey people...

 

I have a question about the new BS...! I dont mean to labour the point but I suspect I have the stem definitions a little confused...!

Whats the accepted take of measurement (F)

It reads like a multi-stemmed tree (..of tree with more than 1 stem @ 1,5m...etc ) which makes it the same measurement convention as (E). Is this the accepted interpretation can anyone tell me ? ( Annex C appears in "normative ref" in the document...! )

cheers

Edited September 26, 2012 by Bundle 2

[Beezy]

Don't know if this helps you Bundle 2, but this is my take on it!

 

Pic E shows a multi-stemmed tree from which each individual stem originates from ground level

 

Pic F shows a multi-stemmed tree which begins from one stem at ground level, then breaks, at 1.5m it is multi-stemmed and you do not take the measurement below basal flare as in Pic C.

 

Think they were just trying to cover all the bases and possible examples of what you may encounter in the field.... maybe?

 

Hope this helps mate

Beezy

[Bundle 2]

Aye, that is my take on it....E & F represent the same thing (arrived at mathematically by the same formula) but essentially aim to weed out confusion by depicting both scenarios...Fair enough !

For some reason, I rather had a notion that the stem diameters for the various limbs measured under the convention set in F were simply added together, thus arriving at a stem diameter....

Just chick'n....!

 

cheers

[Beezy]

Bit annoying that this revision to the BS was meant to eliminate maths...... yeah right!

 

Here goes..... or steal your child's scientific calculator!!

 

Multi-stemmed trees (2-5 stems)

e.g.

 

180x180=32400 + 150x150=22500 + 170x170=28900

= 83800 then square root = 289.5mm using Annex D = 290mm stem dia

 

Multi-stemmed trees (more than 5 stems)

e.g

 

130+150+140+120+170+220+200 =1130 divided by 7 (total no. of stems)

= 161x161 = 25921x7 = 181447 then square root

= 426 using Annex D = 425mm stem dia

Edited September 26, 2012 by Beezy
numpty maths ;)