Years of legal to-ing and fro-ing over an Otago river has come to an end and is a victory for both farmers and the environment, an Otago regional councillor says.

But at least one group involved has serious issues with the judgement.

Justice Rob Osborne last week released his High Court decision to dismiss Otago Fish and Game’s appeal against a 2019 Environment Court decision to set the minimum flow for the Lindis River at 550 litres per second and a primary allocation of 1640 litres per second.

Otago Fish and Game said there were errors of law in the decision, and wanted the minimum flow left at the higher level of 900 litres per second and a primary allocation of 1200 litres per second.

Water from the river is used by more than 50 Lindis and Ardgour Valley water users for irrigation.

Otago regional councillor Michael Laws said the judgement was “a victory for both local irrigators and the Otago environment”.

The appeal had been “spectacularly ill-considered”, as science had been the centrepiece for the Environment Court’s earlier decision, he said.

He believed both the council and Lindis area irrigators must reclaim legal costs from Otago Fish and Game.

Otago Fish and Game chief executive Ian Hadland said its council was considering the implications of the judgement.

The core of its appeal centred on the way trout were treated in the judgement and concerns the Environment Court had not applied the law correctly, he said.

This had implications both for the final decision in respect of the Lindis River, and also other decisions affecting rivers and freshwater habitats.

However, while the judgement might initially seem negative, there were several positives to be taken from it, Mr Hadland said.

“A good outcome of our High Court appeal is that the place of trout and salmon habitat in the Resource Management Act, and as part of the existing environment and ecosystem, was confirmed.

“That’s extremely helpful as we enter the next phase of water planning in Otago.”

The Lindis was “a seriously depleted river” and an important trout nursery stream for Lake Dunstan and the upper Clutha River.

“We’re not comfortable with the idea that a river is sustainably managed when 70% of its low flow is removed for irrigation, but that’s the decision that has been made. Nonetheless, we will continue to stand up for the restoration of depleted rivers.”

Mr Hadland said the decision was in part a reflection of the poor state of Otago’s water planning framework, which an independent review by former environment court judge Prof Peter Skelton described as not fit for purpose.

Mr Hadland believed that was largely to blame for the ongoing conflict and delays around water allocation and large legal bills for all parties.

“If you ran this whole case again tomorrow from the start, I’d suggest the outcome would be more positive for the river, not because of the local planning framework, but because of the Government’s updated national policy statement on freshwater which clearly prioritises the river’s needs first and recognises sports fish habitat as a value to be protected. That’s exactly what we argued in the first place.”

The judgement requires parties, if unable to reach agreement themselves on costs, to file submissions on costs to the court within 10 working days.

An Otago Regional Council spokeswoman said it would respond this week.