Hello All,
BS5837 suggests that "the current ... height of Cat A, B & C trees should be
annotated on the TCP where this would cause unreasonable obstruction to sun
or day light. In practise this could be represented by a segment with a
radius from the centre of the stem equal to the height from due NW to due E
indicating shadow pattern for the main part of each day" (Section 5.3.1).
I am well aware of the limitations, pro's and cons of this but find it to be
a useful indicator of the area most likely to be densely shaded.
I am currently involved in a site where someone has stated: "it is generally
accepted by professional Arbs that this guidance is not entirely accurate
and falls somewhat short of truly representing the potentially shaded area".
So I accept that the advice in 5837 does not show every shaded area or the
whole of the influence of a trees shade, but when assessing shade on a more
detailed level (primarily using ArborShadow) I have found that the area is
the most shaded (or the area most likely to be shaded - see below). It
doesn't take into account crown clearance or the varying density of each
species etc etc, but it does provide a useful indication to layout designers
of the problematic places. I was sceptical originally but have found it a
more than reasonable tool, after numerous detailed appraisals and comparing
them to the 5.3.1 segment.
So here's the question: what do other think about this? Do professional
Arbs accept that this falls somewhat short? Is the shortfall with the
simplistic 5837 shade area that significant? I haven't seen much on the
forum discussing this - I'd like to hear other opinions on this.
Cheers
Dom
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