The defence contains allegations of contributory negligence against the plaintiff. I reject all of them.
14 The judgment was given on the day following the hearing. Even allowing for its nearly extemporary nature, it was in my view inadequate in the exposure of the critical reasoning process. The precise deficiencies of the nosing were not identified, nor the means whereby the Council could or should have prevented people from using the tiers as stairs. The practicalities of doing more to address the two defects were not addressed. The judgment also proceeded, apparently, on the basis that failure to have prevented the accident in the ways identified in the reasoning necessarily constituted a breach of the occupier's duty of care: in other words, the judgment failed to address separately the issue of negligent breach by reference to the well-known calculus found in Wyong Shire Council v Shirt (1980) 146 CLR 40 at 47-8.
15 However, the judgment was not assailed on this basis and this Court is in as good a position as the primary judge to apply the written expert evidence to the facts as found. It is appropriate that we should initially approach the matter through the prism of the trial judge's preference for and acceptance of Mr Adams' report.
16 It is convenient to defer consideration of the evidentiary ground of appeal based upon Makita until it is seen precisely which parts of the Adams reports were critical to the plaintiff's success at first instance. Mr Adams voiced several criticisms about the safety of the pool area, including criticisms about the intermediate steps or stairs. Many of these have no continuing relevance to the case, in light of the findings as to the mechanics of the particular accident.
17 In portions of his first report to which objection was taken at trial, Mr Adams said:
Given the nature and dimensions of the nosings strips, I was not able to perform measurements of coefficients of friction on those strips. However, on the basis of my subjective assessment, I believe that those nosings strips are unlikely to be sufficiently slip resistant when wet. In particular, I would consider the smooth metal sections of the strips as inappropriate for an area that would quite obviously become wet from time to time, and which would be walked on with wet feet by patrons of the centre.
…
The tiered area where Ms Frew experienced her slip and fall fails to meet the requirements of Ordinance 70, the BCA, and of AS 1657, in relation to the dimensions of the goings and rises, the dimensional consistency, the relationships between the goings and rises, and in relation to the handrail. Specifically: the rises were excessively high for a stairway; the goings were also excessive; and the handrail was made difficult to use due to the installation of perspex. Similarly, the intermediate steps that have been provided fail to meet each of those criterion. Specifically: some (if not all) of the rises were excessively high for a stairway and there was excessive variation between the rise heights; each of the goings was also excessive and there was excessive variation between the goings; there was no handrail at all. In addition, the presence of the intermediate steps was not visually obvious.
Further, I believe that the nosing strips that were provided on the nosing of each of the tiers (and not on the intermediate steps) would not when wet have been adequately slip resistant to prevent a slip and fall of the type experienced by Ms Frew. The risk to pedestrians of experiencing a fall when using the tiered area as a stairway would have been increased by that combination of deficiencies and would have been considerably greater than would have characterized a properly designed and constructed stairway.
…
Reasonable preventative actions that could have been implemented by the defendant would include:
…
(iii) More appropriate anti-slip strips that were able to provide adequate slip resistance when lubricated with water could (should) have been fitted to each of the treads in the stairway, as well as to the nosing of each tier….
18 In addition to objecting to the admissibility of these portions of the first Adams report, the appellant submits that the verdict cannot properly rest upon them. Mr Adams' criticism of the nosing material was explicitly "subjective", without any suggestion as to the impossibility or impracticality in obtaining some scientific measure of slipperiness of the smooth metal sections. Nor did Mr Adams indicate the nature of the "more appropriate anti-slip strips" to which he adverts in general terms.
19 These submissions have weight, but it is not necessary to resolve the appeal solely by reference to the debatable evidentiary or probative deficiencies of the first Adams report. The totality of the expert evidence should be considered, reconciled if necessary, and then applied to the findings about the mechanics of the fall in light of the well-established method of determining whether a duty of care has been breached. The judgment as to lack of due care remains that of the court.
20 Dr Cooke deals with the issue of slip resistance in the following terms in his first report :
4.1 I now turn to the question of the slip resistance of the seating platforms and intermediate step treads under wet conditions. I measured the dynamic coefficient of friction of the rubber material used on the platforms (similar to the material used on the treads and risers of the intermediate steps), with a "Pendulum" skid resistance tester specified in Appendix A of AS/NZS 3661.1:1993 for testing a wet pedestrian surface for compliance with the recommended minimum dynamic coefficient of friction of 0.4 in cl 5.1 of AS/NZS 3661.1:1993. The "Pendulum" can be seen in place for the test in Photograph No 7 in Appendix A. Extracts from AS/NZS 3661.1:1993 are in Appendix F. The dynamic coefficient of friction of the wet surface was found to be 0.54, which is well above the recommended minimum of 0.4. Accordingly, the step treads comply with BCA cl D2.13(b)(v). There is no need for additional anti-slip strips as suggested by Mr Adams on page 9, because the entire tread surface is slip resistant. However, as the plaintiff was not using the intermediate steps their design and condition is not relevant to causation.
4.2 The nosings of the seating platforms are required to provide a suitable surface for each for the dual functions of seating and optional access. The nosing is an aluminium framed proprietary nosing with a ribbed rubber or synthetic rubber insert (Photograph No 6). This gives the necessary slip resistant support for the foot and also gives a suitable edge for the platforms when used as seats. The nosing posed no danger to the plaintiff if she had taken reasonable care.
4.3 As with any stair nosing, she was in danger of slipping off the nosing if she did not place her foot fully on the nosing, particularly with wet feet. The stance she adopted, with the back foot placed on the nosing and the front foot stretched out about 800mm towards the nosing above, placed her at risk of slipping off the lower nosing, particularly if she was running or leaping or moving quickly.
….
5.6 The nosings of the seating tiers do not pose a danger to pedestrians taking reasonable care. The nosings are suitable for the dual functions of seat edge and step nosing. Highlighting of the nosings would have had no bearing on causation. The plaintiff did not fall because she could not see the nosings.
21 In a supplementary report Dr Cooke said:
4. I have analysed the design of the nosings in paragraphs 4.2 and 5.6 of my initial report. In my view the nosing is suitable for the dual uses of the seating tiers as seats and as tread nosings when the tiers perform the function of steps.
5. The nosing provides adequate slip resistance and a reasonably comfortable seat edge for spectators sitting on the tiers with bare legs. Stair nosings are available with a variety of front edge profiles, including less rounded edges than the nosing used on the tiers. However, the rounded nosing used is more suitable than a square edged nosing as the primary function of the tiers is to provide seating. When the tiers are used as steps, the rounded nosing is suitable for the widely spaced risers.
6. As discussed in my initial report (particularly paragraph 5.3), it is apparent from the description of the accident that the plaintiff fell because she did not take reasonable care for her own safety. She would have had no difficulty stepping between the tiers if she had taken reasonable care. As with all step nosings, there is a risk of the foot slipping off the outer edge if the foot is placed incorrectly on the nosing. In the plaintiff's case my view is that she lost her footing because she was bounding up the tiers, as a result of which she did not put her foot securely on the nosing of one of the tiers.