Current determination

Seasonal determination increases for the Murray, Goulburn, Loddon and Broken systems

The Resource Manager for northern Victoria today announced an update of 2025/26 seasonal determinations.

The Murray system seasonal determination increases from 60 per cent of high-reliability water shares (HRWS) to 73 per cent HRWS. The Goulburn and Loddon systems increase from 44 per cent HRWS to 47 per cent HRWS.

The Broken system increases from 12 per cent HRWS to 17 per cent HRWS.

The Campaspe system remains at 100 per cent HRWS. The Bullarook system is unchanged at 0 per cent HRWS.

Resource Manager Mark Bailey said flows into the major storages had driven the increases.

“The flows into the storages were higher than our forecasts,” Dr Bailey said.

“The rain and showers since the last update have kept waterways flowing.

“The Murray system received the largest increase after improvements in the Murray storages and flows from the Ovens River.

“There was a small improvement in the Bullarook system but not enough to secure the operating requirements. More rainfall and flows are needed to close the gap to a seasonal determination.”

The seasonal determinations for northern Victorian water systems on Monday 15 September are:

Trading opportunities

Allocation trade from New South Wales to Victoria is limited to the lesser of a net annual volume of 200 GL or a volume that keeps the risk of spill in Victoria’s share of both Hume and Dartmouth reservoirs below 50 per cent. The current risk of spill from Victoria’s share of Hume and Dartmouth allows 200 GL of allocation trade from New South Wales to Victoria. The volume available for trade is updated monthly with each risk of spill announcement. 

Upcoming Resource Manager announcements

• The next 2025/26 seasonal determination announcement will be released on Wednesday, 1 October 2025.
• The risk of spill in the Murray and Campaspe systems will be updated on Friday, 10 October 2025.