The resource manager for northern Victoria recently updated the 2021/22 seasonal determinations.
The Murray system moves from 93 per cent of high-reliability water shares (HRWS) to 100pc HRWS.
The Broken system increases from 100pc HRWS and 85pc of low-reliability water shares (LRWS) to the maximum available 100pc HRWS and 100pc LRWS.
Seasonal determinations in the Bullarook system stay at 100pc HRWS and 100pc LRWS.
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Resource manager Mark Bailey said the Murray system reached 100pc HRWS as strong flows into all major storages continued with recent rainfall.
"The sustained flows into the Murray system have provided enough resource to repay all of the borrowed Barmah-Millewa Forest Environmental Water Allocation and announce the 100pc allocation," Dr Bailey said.
"There are also further deductions from Murray spillable water accounts.
"About 165 gigalitres, or 61pc of the current spillable account volume, will be deducted with today's announcement.
"Further deductions should be expected while the Murray-Darling Basin Authority maintains pre-releases to keep Lake Hume close to its full supply level."
With all northern Victorian systems reaching at least 100pc HRWS, Dr Bailey noted interest in the availability of seasonal determination against low-reliability water shares is expected to increase.
"We will confirm the volume of additional resources needed to make a low-reliability water shares seasonal determination in the Murray system at the next seasonal determination update," Dr Bailey said.
"At present, the Goulburn system needs another 600GL for a low-reliability water shares allocation.
"This volume is needed in addition to the inflows we expect in 99 years in every 100 for the remainder of 2021/22 and into 2022/23."
Dr Bailey also reminded entitlement holders that as seasonal determinations in all systems were 100pc HRWS, future 2021/22 seasonal determination updates will be released on a monthly basis.
"In accordance with our policy, the next update of seasonal determinations will be released on Monday, November 15," Dr Bailey said.
The latest Bureau of Meteorology seasonal outlook favours above-average rainfall across the northern Victoria for the November to January period.
The Bureau has issued a La Nia alert, meaning the chance of a La Nia event forming is around 70pc.
A weak negative Indian Ocean Dipole event continues and is expected to return to neutral levels in late spring.
A negative Indian Ocean Dipole and a La Nia event each increase the likelihood of above-average rainfall totals in south-east Australia.
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