39 This was said in the context of the construction of a right of carriageway whose terms were fully described (at [11]). The Court of Appeal did not hold that the extrinsic circumstances in that case could not be considered because, even in the case of construing a contract, extrinsic circumstances cannot be relied on to render ambiguous what is otherwise clear (Optus Vision Pty Limited v Australian Rugby Football League Ltd [2004] NSWCA 61 at [25]-[32] and [33]).
40 It is, with respect, doubtful whether Westfield Management Ltd v Perpetual Trustee Co Ltd justifies the statement in the terms described in paras [15] and [16]; a fortiori if applied to the construction of the type of grant considered in Powell v Langdon and in this case. However, the statement of law is unequivocal and formed the ratio of the Court's decision. The statement of law was not confined to the construction of instruments which set out in detail the terms of rights granted.
41 I conclude that the statement of principle is binding on me, and accordingly, that the only matters to which it is legitimate to have regard in construing the instrument are the folio identifiers, the registered instrument, the deposited plans and the physical characteristics of the tenements. As I have said, in this case there was no evidence as to the physical characteristics of the tenements at the time of the grant of easement which assists in that process.
42 Although the issue of the licence by the Environment Protection Authority is as much a matter of objective fact as the physical characteristics of the land, and would be as readily ascertainable by a purchaser of the land as the physical characteristics of the land at the time of the grant (or more so), I do not consider that I am entitled to have regard to the licence in construing the instrument.
43 When regard is had only to the registered s 88B instrument itself and the deposited plan 843153, I would infer that what could be piped and irrigated onto the defendant's land within the area of the easement includes water; whether potable water, or waste water being effluent from a sewage system which might be constructed on the dominant tenement.
44 Counsel for the defendant submitted that the easement did not extend to the irrigation of noxious waste which would include sewage. Counsel correctly pointed out that the draftsman did not use the common expression "easement of drainage of sewage" found in s 181A and which was given a defined meaning by schedule 8 of the Conveyancing Act. However, and understandably, counsel could point to no plausible purpose for the grant of an easement for pipeline and irrigation which authorised the owner of the dominant tenement to irrigate approximately 4,924 square metres of the defendant's land, unless the easement authorised the irrigation with waste water which the occupier of the dominant tenement wished to dispose of. In other words, and having regard only to the registered instrument and plan, one can see that there could be no benefit to the dominant tenement in irrigating the servient tenement, unless it were to be irrigated with fluids the owner of the dominant tenement wished to dispose of. No doubt the owner of the dominant tenement would be required to comply with the environmental laws relating to the disposal of fluids and to use the easement reasonably. However, I see no basis for construing the instrument as being limited to irrigation with pure or potable water, as distinct from waste water. The physical boundaries of the easement showing the large irrigation area hundreds of metres away from the dominant tenement suggests the contrary.
45 Counsel also submitted that the spraying or other irrigation of waste water would constitute a nuisance. Counsel submitted that the easement on its proper construction would not authorise the commission of a nuisance. Counsel relied on Pwllbach Colliery Company Ltd v Woodman [1915] AC 634 where the House of Lords held that a grant of a lease authorising use of premises as a miner did not authorise a colliery company's operating a screening apparatus for coal in such a way as to create a nuisance through the depositing of coal dust on an adjoining butcher's meat and sausages. It was essential to that conclusion that the creation of a nuisance was not a necessary incident of the exercise of the right granted, and that the use of the coal screen which created coal dust was not within the contemplation of the parties when the lease was granted (at 639, 641, 646, 648, 649 and 652).
46 The evidence in this case does not establish that use of the easement to irrigate waste water on the defendant's land creates, or would create, a nuisance. The land in question is bushland. In any event, given that the easement, in my view, extends to the irrigation of waste water, if a nuisance were created as a necessary incident to the use of the easement, that use would nonetheless be authorised. If there were an unreasonable use of the easement, for example, a use which consistently and substantially breached licence requirements, then that may well constitute a nuisance, but that is a different question. Such a possibility does not affect the construction of the instrument.
47 I infer that the reason the draftsman did not use the expression "easement for drainage of sewage" is that the parties did not intend that "sewage" in the sense of untreated waste matter which would pass into a sewer if the area were sewered, should be piped and irrigated onto the defendant's land. But it does not follow from that conclusion that the parties should be taken to have intended that waste water, being the by-product of the treatment of sewage, could not be irrigated onto the defendant's land. No other possible purpose of the easement was identified. This conclusion is reinforced by the registration four days later of DP 285220 as a neighbourhood plan. It does no violence to the principles underlying the Torrens system to have regard to that instrument. It is the lots in that plan which are entitled to the benefit of the easement.
48 It would be appropriate to declare pursuant to s 75 of the Supreme Court Act 1970 (NSW), or in the Court's inherent jurisdiction, that the plaintiff is entitled to use the easement to pipe and irrigate waste water, that is to say, effluent which is the product of the sewage treatment system on the plaintiff's land. The easement also carries with it by implication all ancillary rights necessary for its exercise and enjoyment. These include the right of the plaintiff through its licensees to enter the site of the easement to repair or to improve or replace the spray irrigation system previously installed.
49 There was expert evidence that a subsurface drip irrigation system would be a preferable mode of irrigation of effluent. That would need Council approval. It suffices to say that such a system, as well as a system of spray irrigation, would be authorised by the easement. I did not understand the defendant to contend to the contrary if it were held that the easement extends to the irrigation of effluent.
50 Such declarations, unless set aside, would bind the present parties. Counsel for the plaintiff submitted that an order could and should be made under s 89(1)(c) of the Conveyancing Act modifying the existing easement so as expressly to provide that it authorised the piping and irrigation of effluent onto the site of the easement and authorised the owners of the land benefited to do anything reasonably necessary for that purpose, including entering the lot burdened, using existing lines of pipe and equipment, carrying out works such as constructing, replacing, repairing or maintaining pipes and equipment, and further providing for the manner of exercise of those powers.
51 Section 89 of the Conveyancing Act provides:
" 89 Power of Court to modify or extinguish easements, profits à prendre and certain covenants
(1) Where land is subject to an easement or a profit à prendre or to a restriction or an obligation arising under covenant or otherwise as to the user thereof, the Court may from time to time, on the application of any person interested in the land, by order modify or wholly or partially extinguish the easement, profit à prendre, restriction or obligation upon being satisfied:
(a) that by reason of change in the user of any land having the benefit of the easement, profit à prendre, restriction or obligation, or in the character of the neighbourhood or other circumstances of the case which the Court may deem material, the easement, profit à prendre, restriction or obligation ought to be deemed obsolete, or that the continued existence thereof would impede the reasonable user of the land subject to the easement, profit à prendre, restriction or obligation without securing practical benefit to the persons entitled to the easement or profit à prendre or to the benefit of the restriction or obligation, or would, unless modified, so impede such user, or
(b) that the persons of the age of eighteen years or upwards and of full capacity for the time being or from time to time entitled to the easement or profit à prendre or to the benefit of the restriction, whether in respect of estates in fee simple or any lesser estates or interests in the land to which the easement, the profit à prendre or the benefit of the restriction is annexed, have agreed to the easement, profit à prendre, restriction or obligation being modified or wholly or partially extinguished, or by their acts or omissions may reasonably be considered to have abandoned the easement or profit à prendre wholly or in part or waived the benefit of the restriction wholly or in part,
(b1) in the case of an obligation:
(i) that the prescribed authority entitled to the benefit of the obligation has agreed to the obligation's being modified or wholly or partially extinguished or by its acts or omissions may reasonably be considered to have waived the benefit of the obligation wholly or in part, or
(ii) that the obligation has become unreasonably expensive or unreasonably onerous to perform when compared with the benefit of its performance to the authority, or
(c) that the proposed modification or extinguishment will not substantially injure the persons entitled to the easement or profit à prendre, or to the benefit of the restriction or obligation.
(2) Where any proceedings are instituted to enforce an easement, profit à prendre, restriction or obligation, or to enforce any rights arising out of a breach of any restriction or obligation, any person against whom the proceedings are instituted may in such proceedings apply to the Court for an order under this section.
(3) The Court may on the application of any person interested make an order declaring whether or not in any particular case any land is affected by an easement, profit à prendre, restriction or obligation, and the nature and extent thereof, and whether the same is enforceable, and if so by whom.
(4) Notice of any application made under this section shall, if the Court so directs, be given to the council of the area (within the meaning of the Local Government Act 1993) in which the land is situated, and to such other persons and in such manner, whether by advertisement or otherwise, as may be prescribed by rules of Court or as the Court may order.
(5) An order under this section shall, when registered as in this section provided, be binding on all persons, whether of full age or capacity or not, then entitled or thereafter becoming entitled to the easement or profit à prendre, or interested in enforcing the restriction or obligation and whether such persons are parties to the proceedings or have been served with notice or not.
(6) This section applies to easements, profits à prendre and restrictions existing at the commencement of the Conveyancing (Amendment) Act 1930, or coming into existence after such commencement.
(7) An order under this section affecting land not under the provisions of the Real Property Act 1900 may be registered in the General Register of Deeds. No such order shall release or bind any land until it is so registered.
(8) This section applies to land under the provisions of the Real Property Act 1900, and the Registrar-General shall, on application made in the form approved under that Act, make all necessary recordings in the Register kept under that Act for giving effect to the order.
For the purposes of this subsection, a grant, certificate of title or duplicate registered dealing that is not in the possession of the Registrar-General shall be deemed to be wrongfully retained within the meaning of section 136 of the Real Property Act 1900.