• to cancel the approval the subject of the determination (s174(1)).
35 The tribunal's decision is appealable to the LEC (s174(4)). The appeal is a Class 3 appeal (Land and Environment Court Act 1979, s19(h)) and the LEC's powers on appeal include the power to exercise the functions of the proscribed tribunal (id, s39(2)). The court is required to have regard to any relevant Act, the circumstances of the case and the public interest (id, s39(4)).
36 Section 171(3) (in relation to determinations by the Corporation) and s174(2) (in relation to decisions of the prescribed tribunal on referred determinations) correspond in their operation. Each subsection qualifies subsection (1). The subsections limit the power to impose conditions by denying such power "except where it [ie the Corporation/tribunal] is satisfied that, unless the controlled work complies with that condition, the controlled work has the proscribed effect (ss171(3)(a), 174(2)(a)).
37 The subsections also limit the Corporation's power to refuse to grant an approval and the tribunal's power to cancel an approval except where the decision-maker is satisfied that the controlled work does not have the proscribed effect (ss171(3)(b), 174(2)(b)).
38 Bignold J held that these corresponding subsections also limit in a similar way the Corporation's power to grant an approval (s171(1)(a)) and the tribunal's power to confirm the Corporation's determination (s174(1)(a)). On this construction, his Honour held that the Board had erred because its Report disclosed that it had confirmed the determination in Engsta's favour notwithstanding that it ought to have been satisfied that the levee was likely to have the proscribed effect.
39 The major premise in his Honour's reasoning was that the Board lacked the power to confirm a determination approving a controlled work if it was satisfied that it had the proscribed effect, at least without imposing conditions designed to remove that effect. The minor premise was that the Engsta levee had that effect, in the sense that the only conclusion reasonably open to the Board was that it should have been so satisfied.
40 I do not propose to address the minor premise. Its correctness may not raise a question of law. It was not fully debated in this Court. And there is the possibility that fresh evidence may be adduced in the further appeal in the LEC if proceedings are remitted to that Court. I would not wish this to be interpreted as agreement with his Honour's assessment that the Board went beyond the task which it had set itself: the contrary is arguable, for the reasons set out at pars 24-5. There is a further reason why it is unnecessary to consider the correctness of his Honour's minor premise. That is because, on the interpretation which I favour, both the Board and the LEC were entitled to receive and act upon material going beyond the issue of the proscribed effect of the levee. Just as the Corporation was entitled to grant unconditional approval having regard to wider considerations, so long as consonant with the statutory scheme as a whole and procedural fairness, the tribunal (and, on appeal the LEC) had a corresponding power to confirm an unconditional determination of approval.
41 In my view the major premise misconstrues the statutory scheme. My reasons follow.
42 Section 171(3)(a) and s174(2)(a) preclude the imposition of any condition upon an approval except where the decision-maker is satisfied that, unless the controlled work complies with that condition, the controlled work is likely to have the proscribed effect. It follows that the sole permissible trigger for the imposition of conditions is such satisfaction. In my view it also follows, by necessary implication, that the conditions which may be imposed are confined to those which, unless complied with, are reasonably capable of being related to the purpose for which the power to impose conditions is exercised (Allen Commercial Constructions Pty Ltd v North Sydney Municipal Council (1970) 123 CLR 490 at 499-500, Bathurst City Council v PWC Properties Pty Ltd (1998) 195 CLR 566 at 577).
43 Prima facie, the Corporation's undoubted power to grant unconditional approval (cf s171(1)(a)) and the tribunal's power to confirm such a determination (cf 174(1)(a)) or to render a conditional approval unconditional (cf s174(1)(b)(i)) are at large. At large, in the sense that the discretion is unconfined except in so far as "the subject matter and the scope and purpose" of the Act may enable a Court to identify reasons "definitely extraneous to any objects the legislature could have had in view" (Water and Irrigation Commission (NSW) v Browning (1947) 74 CLR 492 at 505. For recent endorsements of this approach, see Oshlack v Richmond River Council (1998) 193 CLR 72 at 81, 84, Chakravarti v Advertiser Newspapers (1998) 193 CLR 519 at 555 n91).
44 These powers of unconditional approval are not limited substantively by any express provision in the Act. Subsection (3) of s171 and subsection (2) of s174 only limit in terms the power to "impose any condition" or to "refuse to grant" (Corporation) or "cancel an approval" (tribunal). To press s171(3) and s174(2) into wider service in the field of unconditional approvals finds no support in the plain words of the sections. Furthermore, it overlooks the distinctions within the respective sections that are drawn between impose/refuse to grant/cancel an approval on the one hand and grant/confirm/remove any condition on the other. The distinction is found within the very terms of s174(1)(b).
45 There is ample work for s171(3) and s174(2) to do without treating their terms as going beyond their express remit. In those circumstances, one is reminded of Stephen J's admonition that "to read words into any statute is a strong thing and, in the absence of clear necessity, a wrong thing" (Western Australia v The Commonwealth (1975) 134 CLR 201 at 251). There are exceptions, where omission would lead to an incongruous result or would defeat the objects of the Act or be "capricious" or "irrational" (Cooper Brookes (Wollongong) Pty Ltd v Federal Commissioner of Taxation (1981) 147 CLR 297 at 305, 311, 321). But the present case does not call for such legislative surgery, especially when it is recognised that statutorily extraneous considerations would vitiate the decision in any event and where there is an appeal by way of rehearing to the LEC.
46 I acknowledge that the contrary proposition is arguable, on the basis that one could question what is the point of imposing conditions confined to removing the proscribed effect if the whole issue can be sidestepped by unconditional approval.
47 The answers I would give are:
(a) I refer to the textual arguments set out above;
(b) The real work of s171(3) and s174(2) is to confine the powers to refuse, cancel or to impose conditions to situations where the moving consideration is the proscribed effect. In other words, one is not dealing with a general town-planning power (see further my remarks below about the limited range of permissible conditions);
(c) No one can compel the issuance of unconditional approval;