Rodriguez & Sons Pty Ltd v Queensland Bulk Water Supply Authority trading as Seqwater (No 9)

The plaintiffs, Rodriguez & Sons Pty Ltd, sought to amend their statement of claim against the Queensland Bulk Water Supply Authority trading as Seqwater. They aimed to incorporate further expert reports into their case, specifically focusing on the operation of dams during flood events. The dispute was heard in the Supreme Court of Queensland. The core issue was whether the plaintiffs could rely on additional simulations contained in a further expert report, and if so, under what conditions. The court had to determine if the plaintiffs could amend their statement of claim to include this new evidence and whether such amendments would unduly prejudice the defendants.

The court considered whether the plaintiffs' attempt to reserve the right to rely on any future simulations arising from the Court's judgment was appropriate. The plaintiffs argued that the amendments were necessary to strengthen their case, particularly in light of the importance of the additional simulations to their primary case. However, the defendants raised concerns that allowing such amendments would lead to significant delays, as responding to the new evidence would likely take months. The court had to balance the plaintiffs' right to amend their pleadings with the need to avoid unnecessary delays in the proceedings.

In its decision, the court allowed the plaintiffs to amend their statement of claim to include the additional simulations from the further expert report. The court recognised the importance of these simulations to the plaintiffs' case but emphasised the need to ensure that the defendants were not unduly prejudiced by the late introduction of new evidence. The court disallowed the plaintiffs' attempt to reserve the right to rely on any future simulations, as this would have created an open-ended and potentially indefinite extension to the proceedings. However, the court permitted the plaintiffs to rely on the additional simulations as part of their primary case, subject to the defendants being given a reasonable opportunity to respond.

The court ordered that the plaintiffs could amend their statement of claim to include the additional simulations from the further expert report. The plaintiffs were allowed to rely on this new evidence in their case. However, the court emphasised the need for the defendants to be given a reasonable opportunity to respond to the new evidence, to avoid undue prejudice and delay in the proceedings. The court set a timeline for the defendants to respond to the amended statement of claim, ensuring that the case could progress in a timely manner.