Seasonal Determination 3 December 2018

Monday 3 December, 2018

2018/19 seasonal determinations update

The northern Victoria Resource Manager today updated 2018/19 seasonal determinations.

The Murray system moves from 90 per cent of high-reliability water shares (HRWS) to 94 per cent HRWS.

The Goulburn system and the Loddon system increase from 85 per cent HRWS to 88 per cent HRWS.

The seasonal determination in the Broken system increases from 20 per cent HRWS to 24 per cent HRWS.

The Campaspe system remains at 100 per cent HRWS and the Bullarook system remains at 100 per cent HRWS and 100 per cent of low‑reliability water shares (LRWS).

Resource Manager Mark Bailey said recent rain helped to improve water availability.

“Much of northern Victoria received average rainfall during November,” Dr Bailey said.

“Rain briefly increased flows into several of the major storages during the past fortnight,” Dr Bailey said.

“The flows were higher than our conservative estimates and provided additional resource to allocate.

“However, the flows into the storages remained well below the long-term average.”

Dr Bailey noted the climate outlooks for summer rainfall did not favour wetter or drier conditions.

“The latest Bureau of Meteorology seasonal outlook indicates there is an even chance of receiving above average rainfall during the December to February period,” Dr Bailey said.

“The Bureau has issued an El Niño Alert, meaning the chance of an El Niño forming in 2018 is around 70 per cent. The positive Indian Ocean Dipole continues, but its influence on rainfall is likely to reduce in December.”

Dr Bailey urged water users to continue planning their water needs carefully. “Websites such as the Resource Manager (, the Victorian Water Register ( and the Murray-Darling Basin Authority ( provide information about water trends and availability, which can help users plan their use.”

Water System High-Reliability Water Share Low-Reliability Water Share
The seasonal determinations for northern Victorian water systems on Monday, December 3.
Murray 94% 0%
Broken 24% 0%
Goulburn 88% 0%
Campaspe 100% 0%
Loddon 88% 0%
Bullarook 100% 100%

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 the Murray system below 50 per cent.

The current risk of spill limit allows 200 GL of net trade from New South Wales to Victoria.

The Goulburn system’s inter-valley trade (IVT) account owes about 202 GL to the Murray system. The Goulburn, Campaspe and Loddon systems can trade to the Victorian Murray system, New South Wales and South Australia while the total volume owed to the Murray system is less than 200 GL.

Deliveries of Goulburn system IVT to support Murray system operations are planned to continue in December and January. Information on IVT deliveries is available on the Goulburn-Murray Water website, Goulburn-Murray Water website.

The Goulburn, Campaspe and Loddon systems can trade from the Victorian Murray system, New South Wales and South Australia while the total volume owed to the Murray system is greater than zero.

Customers participating in the water trading market can monitor trade availability on the Water Register website. Additional information about how trade opportunities are calculated is available on the allocation trading page.

The Murray-Darling Basin Authority (MDBA) is restricting trade of water allocations from above the Barmah Choke to downstream of the Choke to protect the delivery of downstream water entitlements. Customers can monitor trading opportunities across the Barmah Choke on the MDBA website.

Upcoming Resource Manager announcements

  • The next 2018/19 seasonal determination announcement including an update will be released on Monday December 17, 2018.