Murrumbidgee Groundwater Preservation Association Inc v Minister for Natural Resources

The Murrumbidgee Groundwater Preservation Association Inc (the Association) appealed to the Court of Appeal of New South Wales against a decision of the Supreme Court of New South Wales concerning the validity of a water management plan prepared by the Minister for Natural Resources. The dispute centred on the lawfulness of certain provisions within the Minister's plan, which the Association contended were invalid.

The primary legal issues before the Court of Appeal were whether the Minister's water management plan was invalid on grounds of being made for an extraneous purpose, or because it contemplated a right not supported by the governing statute, even if such a right could be created through a series of executive acts. Further, the court considered whether the plan was invalid due to irrationality, or because a formula within it was mathematically impossible or created difficulties due to its commencement date. The court also had to determine if amendments to the relevant Act could save the impugned provisions.

The Court of Appeal, comprising Spigelman CJ, Beazley and Tobias JJA, dismissed the appeal. The court found that the Minister's plan was not invalid for extraneous purpose, nor was it invalid for contemplating a right not supported by statute, as the statutory framework permitted the creation of such rights through executive action. The court also rejected arguments of irrationality and mathematical impossibility, finding that any difficulties arising from the commencement date did not render the plan invalid. The court further held that amendments to the Act did not retrospectively validate the provisions in a way that would cure the alleged defects.

The appeal was dismissed with costs.