Webster v Mosman Municipal Council

The case of *Webster v Mosman Municipal Council* involved an appeal to the High Court of Australia from the Supreme Court of New South Wales. The appellant, Ms. Webster, sought an injunction against the Mosman Municipal Council, alleging that the Council had wrongfully and negligently constructed roads and drains that diverted and concentrated more water onto her land than would naturally flow there. She also claimed the Council had trespassed on her land by constructing a drain. The Council contended that it had acted under the authority of section 241 of the *Local Government Act 1919* (NSW) to drain public roads and that no damage had been caused to the appellant's land.

The central legal issues before the High Court were whether the Council's actions in constructing and maintaining the drain constituted a trespass or an actionable nuisance, and whether section 241 of the *Local Government Act 1919* provided a defence for the Council's conduct. Specifically, the Court had to determine if the Council had exceeded its statutory powers by causing an increased flow of water onto the appellant's land, and if the absence of actual damage to the land precluded the appellant from obtaining injunctive relief.

A majority of the High Court, comprising Knox C.J. and Starke J., dismissed the appeal. They reasoned that the appellant, or her predecessors in title, had altered the natural watercourse on her land by filling it to create a defined channel with banks. The Council, acting under section 241, had then constructed a concrete invert along the bottom of this channel. The majority held that so long as the appellant's banks remained in place, the Council was entitled to treat this channel as the substitute for the natural watercourse and the proper outlet for drainage from the area. They concluded that the Council had made reasonable provision for the discharge of both natural and increased water flow, and that its actions, in the circumstances, did not infringe any of the appellant's rights. Isaacs and Rich JJ. dissented, arguing that the Council's actions constituted an unlawful imposition of a burden on the appellant's land, and that "damage" for the purposes of injunctive relief was not limited to actual pecuniary loss. Higgins J. also dismissed the appeal, finding that while the Council had no right to send more water than naturally flowed, the appellant suffered no actual damage and would only do so if she removed the filling she herself had placed, which was not alleged.

The High Court, by a majority, affirmed the decision of the Supreme Court of New South Wales and dismissed the appeal with costs.