Tree Surveys - BS5837
There is a systemic, widespread fixation with providing baseline survey information solely on the measuring and categorisation of trees as outlined in BS5837. Worryingly this is more and more frequently done without adequate understanding and by arborists of limited experience. The profession is on a race to the bottom.
The average tree survey I come across is very rarely in accordance with BS5837. There are a number of common failings from incorrect data gathering to inappropriate allocation of quality category. It’s not about measuring trees as quickly as possible and applying generic rules of thumb to report key issues. For example…. here’s a quick discussion about one key concept that is consistently misunderstood.
Root Protection Area [RPA]
“RPA: the minimum area around a tree deemed to contain sufficient roots and rooting volume to maintain the tree’s viability…”
By definition this means that the RPA needs to provide a tree with enough soil to live, grow and develop. Logically, a minimum RPA cannot achieve this as it typically represents less than half of the actual rooting area - and working to a minimum RPA can only inhibit the future growth potential of retained trees.
Anchoring to the minimum RPA impacts mature trees the most. Young, healthy trees showing good vigour will no doubt recover from significant root loss - stressed or older trees are much more vulnerable. And in any case, to have any real understanding of where the RPA should be requires some knowledge of the particular soil on site. Please… DIG A HOLE.
There is a need to address the shortcomings of consulting arbs and raise professional standards. Inappropriate RPA information is but one argument from ignorance pervading its merry way through the planning system. The role of the arboriculturist is a challenging one - it takes knowledge, skills and experience. The current framework is failing and currently there is a lack of training, support and mentoring. In part this can be addressed with now ready-to-launch new training…
Arboricultural Impact Assessment [AIA] System & Training
More AIA system details to be released in the near future….
