As I understand her evidence, she does not claim that the water flowing down her drive has ever surmounted the step at her back entrance and flowed into the house; I take it that any water that she has seen in the house near the back door has been driven under the door during heavy rain.
27 There is a drainage easement in favour of the Council through her property to take excess water from Ross Street to the street below, namely, Ponsonby Street. It would seem that the pipe in this easement is inadequate to drain water quickly enough, at least in severe rain events. Unfortunately, the precise terms of the easement were not before me by reason of lack of clarity of the microfiche copy available in Sydney of the transfer in which it is recorded. I gather that the original is held in an archive, but it was not available to the Court. This illegibility of the microfiche should sound a warning against the destruction of archived material which may contain the only record of current rights (quite apart from their historical value).
28 The evidence before me in this case has been something of a moveable feast. The plaintiffs originally put forward a proposal for drainage by a pipe which travelled its whole length from the rear allotment of their property to Ross Street within the child care centre and required an easement through the child care centre for its whole length. That proposal has been changed during the course of the hearing in favour of a scheme where the drainage pipe travels for only a short distance through the child care centre in its north eastern corner and then crosses into the road reserve. The plaintiffs have applied to the defendant under the Roads Act 1993 during the course of the hearing, as noted in [2] above, for permission to discharge water through the road reserve to the street.
29 Another aspect in which the evidence in the case has been a moveable feast is the expert evidence that has been led as to the effect of the discharge of storm water from the plaintiffs' proposed rear allotment to Ross Street on the water problem that undoubtedly exists in that street. Probably already most of that water reaches Ross Street by percolating through the child care centre. However, there is little doubt that the flow would be concentrated and the situation potentially exacerbated by the construction of a dwelling with the consequent creation of hard surfaces on the rear allotment and the concentration of the water in a pipe. There has been great disagreement between the plaintiffs' and the defendant's experts over the effect of this. Their evidence has been given in fits and starts and none of it has in my view been very clear or satisfactory. They have not even been able to agree as to the formula according to which the consequences of the flow should be calculated (the ILSAX method as against the rational method). In the end, it seems clear that the retention tank on the property to delay the discharge of the water to the street below as originally proposed by Mr Staniland, the plaintiffs' expert, was too small. On the other hand, it appears to be conceded by the defendant and the expert on whom it ultimately most heavily relied, Mr Lau, that if a larger retention tank were provided and if the water were discharged not into the gutter, but into an under road drainage pit, then at least in relation to a rain event of up to one in 20 years there would be no addition to the ponding in Ross Street or the overflow into the properties of Smiles or others on the southern side of that street. However, in respect of rain events of less than one in 20 year frequency, there would still be a discharge of water into Ross Street which could cause overflowing into those properties. I do not, on the evidence led, feel any great confidence that this would not occur more frequently. On 31 March 2003, after I had initially reserved judgment, the plaintiffs applied to reopen their case to read yet a further affidavit by Mr Staniland. The evidence sought to be led did not substantially clarify or demystify the expert evidence. It would not have made any difference to the decision of the case. It may have further delayed matters to give the defendant a chance to answer it. I therefore refused the application.
30 The alternative proposed by the Council is for a pump out system westwards to Panorama Parade, probably with a requirement for discharge through an under street pipe into a drainage pit on the western side of that street. The reason for that is that, if the discharge were into the gutter on the eastern side of Panorama Parade, the water would in any event run in the gutter around the corner into Ross Street and join the waters that constitute the problem in that street. The defendant suggests that its proposal would in fact have a beneficial effect on the ponding and overflow in Ross Street, because it would mean that the waters which at present percolate from the rear of the plaintiffs' property to Ross Street would no longer do so, but would be redirected to Panorama Parade and drained away underground in that street.
31 There has been agreement between the parties, at least as to the range within which the costs of these various proposals would fall. I should say at once that I should regard the discharge of the waters to the gutter either in Ross Street or in Panorama Parade as unsatisfactory, so that the two alternatives to be compared are the discharge of gravity drained water to an underground pit in Ross Street or the discharge of pumped water to a drainage pit on the western side of Panorama Parade. The plaintiffs put the estimated costs of these proposals respectively at $27,700 and $54,200 and the defendant respectively at $35,000 and $40,000. The plaintiffs' figure of $27,700 for the Ross Street proposal is probably low, as it does not on the evidence allow for an additional pit for which the Council has allowed for (and on the evidence it seems to me that the Council's is the preferable proposal). The maximum difference between the gravity and the pump out proposals on these figures is some $26,000 on the plaintiffs' figures and some $5,000 on the defendant's figures. As to the true figure for the difference, it would be fair to take it as probably between $10,000 and $20,000.
32 In addition to their complaint about the additional cost, the plaintiffs' objection to a pump out system is the greater risk of malfunction. Obviously complete failure of the pump out system would leave the storm water from the rear allotment of the plaintiffs' property to overflow in that property and to drain to Ross Street through the child care centre which the defendant is developing. However, pump out systems, when allowed, require double pumps to be installed. The pumps are electric. The worst risk of complete failure is through electrical blackout in a heavy storm. However, the witnesses who have had experience, albeit in a comparatively limited way, with pump out systems that have been installed knew of no instance of complete failure. And, on the other hand, there must remain at least the remote possibility of unintended discharge from a gravity system through overflow of the retention tank in extreme conditions or blockage of the pipe. In my view the plaintiffs have not established in this case preferability and certainly not substantial preferability of the development with the easement over the development without the easement. The defendant does allow the use of pump out systems in appropriate circumstances. So far as it matters, that distinguishes this case from the decision of Foster AJ in King v Carr-Gregg supra, where the relevant council had an absolute prohibition against the use of such systems.
33 The plaintiffs have not been speedy in bringing their claim before the Court to trial. The defendant in the meantime has steadily proceeded towards the execution of its project for a child care centre. Development consent for that centre has now been granted. It is apparent from the plans that some awkwardness and difficulty would be created by provision for the plaintiffs' proposed pipe through the north eastern corner of the relevant allotment. I am not suggesting that the difficulties are insurmountable, but they are not without substance.
CONCLUSIONS
34 In deciding whether under s 88K(1) of the CA the plaintiffs, on whom the onus rests, have established that the grant of an easement is reasonably necessary for the development of the property, the Court is faced with the following situation. The plaintiffs say that it is reasonably necessary that they have the easement to permit the gravity discharge of water to Ross Street. The defendant says that the grant of the easement is not reasonably necessary for the development of the plaintiffs' land because an alternative exists which is viable and not, in the order of things, inordinately expensive, namely, the installation of a pump out system to Panorama Parade, which it would seek to impose as a condition on renewal of the plaintiffs' application for development consent. In considering the impact on the plaintiffs of the additional expense, I bear in mind that the subdivision is clearly to the plaintiffs' advantage by providing them with a separately saleable suburban block of land, which is obviously of considerable value. I do not think it weighs heavily against the plaintiffs' proposal that the land over which the easement is asked is owned by a public authority, namely, the defendant. It is said that this is an improper compromise of public land. However, in reality, although a function of public utility will be conducted on the land, in my view it is more appropriate in this instance simply to regard the defendant as another landowner whose rights will be interfered with. That interference, however, is not contemptible.
35 Remembering the confiscatory nature of the statute; the fact that there is a degree of real difficulty which would be caused by the easement and the pipe traversing the defendant's land; the existence of some problem arising from ponding of water in Ross Street; the possibility that that would be added to at least in greater than one in 20 year rain events; and, most importantly, the existence of a viable alternative by the pump out of water to Panorama Parade, it is my view that the plaintiffs have not in the requisite way established that it is reasonably necessary that they should have the easement sought.
36 I should say that, if it were material, I should find that it has not been established that the dominant tenement will not be inconsistent with the public interest. That is by reason of the fact that it is not established that the water problem in Ross Street would not be aggravated by the discharge of water from the proposed rear allotment. I should find that all reasonable attempts have been made by the plaintiffs to obtain the easement or an easement having the same effect but have been unsuccessful. If I am wrong in my conclusions that the easement is reasonably required and concerning the public interest, I should exercise my discretion against the grant of the easement on the grounds set out in [35].
37 The result is that the plaintiffs' summons must be dismissed.