Jeremy Barrell | Tree Risk Management - Likelihood of Occupancy

2021-05-24 11:38 AM | Admin (Administrator)

Jeremy Barrell’s Arb Magazine version of his journal article has been posted by the Arboricultural Association, on their website, as a 'Legal Update' - it's not a legal update.  It's had some Duty Holders and Arborists ask us about where his binary, ‘High’ or ‘Low’ likelihood of occupancy approach sits with VALID's likelihood of occupancy categories.

To recap. The heart of the article is three legal cases cherry-picked by Jeremy Barrell, where Jeremy acted as an expert, and are Jeremy’s interpretations of these cases where Jeremy’s evidence was a key factor.

When we first went through the article, we were disappointed to find it appeared to be less about reasonable, proportionate, and reasonably practicable tree risk-benefit management (which is surely what the Courts and Coroners are after).  And more about setting out what Jeremy expects to contest when he's employed as an ‘expert witness’. 

Jeremy Barrell Tree Risk Management Article

Back to the binary ‘High’ v ‘Low’ likelihood of occupancy.

VALID’s likelihood of occupancy categories are based on log base 10, like the Richter scale uses to measure earthquakes. If we show the likelihood of occupancy to scale as 10 x 10 canvases, and set High at the centre, we can compare VALID’s and Jeremy’s likelihood of occupancy categories.

Likelihood of Occupancy | Tree Risk Management

Jeremy Barrell Tree Risk Management | Likelihood of Occupancy

Jeremy’s High occupancy spans 4 Richter Scale orders of magnitude with a range of ×10 000!

Or, another way of looking at it.  A Richter scale 4 earthquake is categorised the same as a Richter scale 7 earthquake.

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