42 Mr Godfrey also provided a detailed statement but I consider it of limited value in estimating the age of the vegetation. Even though he inspected the property prior to purchase and made enquiries of the vendor Mr R. Munro, he apparently made no detailed measurements of the vegetation in the subject area and in any case has no expertise in this area of the estimating the age of vegetation.
43 In summary then, I have considered the various evidence regarding observations and estimates of the age of the cleared vegetation and I am satisfied that the respective experts Dr Smith and Mr Dyason have expertise, which can be relied upon to provide guidance in this matter, in preference to the recollections of the lay witnesses, of the tree and shrub diameters/heights of vegetation within dense bushland.
44 In support of this position, I note Mr Santin's statement that ; "I agree with Michael Wood when he states there was easily in the order of 500,000 stems in the windrows. I would estimate this would be the minimum number of stems in the windrows. This would be an estimate at the lower end…. The characteristics of this vegetation leads me to believe that it was less than 10 years old. As Mr Woods subsequently acknowledged his mathematical error of magnitude 10, i.e. resulting in the number of stems being closer to 50,000, it appears that Mr Santins acceptance of the original figure to confirm his conclusion, puts serious doubts on his ability to assess vegetation density or age.
45 Accordingly, I find the evidence of Dr Smith more reliable because of the general consistency between his field measurements of the cleared vegetation diameters and correlation with the Setcan model, to establish that the age of this cleared vegetation was more likely to be older than 10 years. Furthermore, this accords with his interpretation of the associated aerial photographs, that the subject area did not show evidence of clearing in 1993/94 as claimed.
46 Insofar as Mr Dyason referred to the application of the Setcan model, apparently its use is of "limited license" and Mr Dyaon is not an accredited user. Therefore, his criticisms of this model are of a speculative nature and given reduced weight. Instead, I accept Dr Smith's evidence that application this model, in the current circumstances, represents "current best practice", and accordingly provides the most scientific indicator of vegetation age.
47 I further discount the reliability of Mr Dyasons evidence because of his initial acceptance (without qualification) of the incorrect tree density calculations, from which he drew his initial conclusions. I also accept Dr Smith's criticism of Mr Dayson's " apical dominance" approach that "the presence or absence of apical dominance is not a recognised or accurate method of determining tree or shrub age. There is no available model, which shows a correlation between age and apical dominance. Individual plants may lose apical dominance when young if they are suppressed (overshadowed), or retain apical dominance when older if emergent."
48 In summary, my conclusion on the question of "ageing" the vegetation is that Dr Smith's approach is preferred because it is based on current scientific methods and is correlated to the actual vegetation on the site. Finally, I note Mr Dyason's concession from the joint expert conference that:
he does not have a developed model or procedure for ageing vegetation and in the absence of historical information from land holders he would need to seek expert advice on methods of vegetation ageing…
49 The other significant aspect of the land-based investigation concerns any effects of the clearing on the environment. These investigations are contained within the evidence of Dr Smith and Mr Dyason.