63 There was an issue joined between the parties concerning the potential groundwater supply which could be drawn from bores on the subject land. The plaintiff called a hydrologist, James Reginald Davies, who had carried out work and prepared a report in June 1993 for LandCorp. The purpose of the report was to consider whether or not there might be problems associated with contamination from any industrial operations on the subject land if it became an industrial site. He sank some bores, and although his report was not directed to water quality or water quantities, he was nevertheless called by the plaintiff and was able to provide information about water quality and quantities in relation to the subject land. So far as water quality is concerned, much of the water which could be sourced within the subject land via bores was of a quality fit for human consumption. As for the rest, it was suitable for farm animals. Mr Davies concluded that based upon the useage figures published by the Water Authority in relation to Perth properties, a combination of rainwater and water supplied from underground the subject land via bores would be sufficient to meet the needs of the 244 lots. Mr Passmore, a hydrologist called for the defendant, disagreed. However, Mr Passmore did agree that 60,000 cubic metres of water could be drawn annually from bores. This amounts to 60 million litres which could be supplied to the sites to supplement rainwater supplies. There were issues raised, for example, whether the Perth useage figures were appropriate for the lot sizes in question, but in my view it is not necessary to become bogged down into that kind of detail. The issue is whether or not a hypothetical purchaser would have concluded that the WAPC was likely to have granted subdivisional approval in relation to the hypothetical application. It seems clear that a hypothetical purchaser would have noted that planning legislation for small rural holdings without reticulated water, subject to a condition that residents install a 92,000 litre rainwater tank, would permit such development. In my view, it is likely that if all else favoured subdivisional approval, then in relation to water the only condition which would be imposed in relation to the hypothetical subdivision would be a condition requiring that owners install a 92,000 litre rainwater tank to supplement the reticulated bore water to be supplied by the developers.