Murray–Darling Basin Authority, Media Release, 29 September 2023

Senior Director of River Management Joe Davis said the Murray–Darling Basin Authority (MDBA) had instructed WaterNSW to hold releases from Weir 32 at the current rate of 1,000 megalitres per day while the effects of the forecast rainfall on system flows could be determined. 

“Managing river flows and storages in the Basin is complex and requires us to work adaptively to account for changing demands and conditions,” Mr Davis said.

“Despite warm and dry conditions persisting in September, a potentially significant rainfall event is now forecast for early October across the upper Murray and north-east Victorian catchments, which is why we are adjusting the call on water from Menindee Lakes. 

“Due to the forecast rain, we anticipate being able to meet current demands without further increase in the releases from Menindee. 

“We’re working on the best and latest available data from the Bureau of Meteorology, and while the actual rainfall totals and flow response remains uncertain, there is now a potential for higher flow in the River Murray system.

“The MDBA only calls on water when it is needed and in the short-term the release of 1,000 megalitres per day from Menindee Lakes will support the delivery of River Murray requirements.”

This decision is consistent with the MDBA’s obligations set by joint Governments to operate the River Murray system in an efficient manner to maximise water availability for all River Murray users.

Since Wednesday 27 September, releases increased from the 550 to 1,000 megalitres a day to meet demands.

Releases were planned to increase daily from Weir 32 until they reached 3,000 megalitres per day, however these have been put on hold while the effects of forecast rain are determined.

“The release strategy will continue to be adaptively managed to get the best outcomes for the whole River Murray system. Changes in forecast rainfall will influence the release strategy,” Mr Davis said.

“The MDBA has worked with water quality and environmental experts to take account of the adjusted release on lower Darling environmental conditions.

“Since the Bureau of Meteorology outlook still indicates dry weather for the coming months, we expect that releases will again be increased in the coming weeks and months as needed for River Murray system demands.”

Further updates will be provided as the release strategy evolves.

For information on scheduled events, water quality and operations at Menindee Lakes visit the WaterNSW WaterInsights website.