Flows in the River Murray System for December 2023

Flows in the River Murray System vary widely depending on a range of factors, including rainfall, inflows, evaporation, and demands for water from all users.

Published: 15 January 2024

At any given time, water flowing through the river is destined for various uses, including irrigation, industry, communities, the environment, and meeting South Australia’s flow entitlement.

The exact mix of these flow components is determined by a number of factors including demand and water availability.

Each month we provide an update showing flows in the River Murray System including the total volume of water flowing for consumptive use and to care for the environment. The update also outlines the intended environmental outcomes.

Information in the figure above is for the month of December 2023 and may not include recent rainfall or delivery of water for the environment in the River Murray system. Information in this figure is an average estimate over the past month and formal accounts from Basin state governments may vary. Water for the environment in the figure above represents water that is held by environmental water holders, through entitlements. Other water that flows through the river can also achieve environmental outcomes.

River flow information

The December flow to South Australia included water for South Australia’s entitlement, traded volumes and water for the environment. Water for the environment at the South Australian border comes primarily from return flows from upstream environmental water use.
For the latest information on water for the environment see the River Murray weekly report.

Intended environmental outcomes

Water for the environment takes time to move through the system. Water from past watering events is still moving through the River Murray as return flows. Environmental water holders can also use water for the environment by extracting allocations directly from the river. These allocations are often used for small-scale watering events rather than having water delivered from a storage.

Location Return flows used at site Intended environmental outcomes
River Murray delivery N/A
  • Maintain connection between the River Murray and its forests, wetlands and creeks
Barmah–Millewa Forest Yes
  • Enable carbon and nutrient cycling between the floodplain and river through connectivity
  • Enhance the health of river red gums and aquatic vegetation
  • Promote growth of floodplain marsh communities
Murrumbidgee N/A
  • Support Murray cod nesting and aid dispersal of golden and silver perch
Edward/Kolety–Wakool River system Yes
  • Maintain and improve large-bodied native fish populations (such as Murray cod)
Great Darling Anabranch N/A
  • Maintain native fish populations, with particular focus on the dispersal of golden perch from Lake Cawndilla to the Murray
Lower Darling–Baaka River No
  • Improve dissolved oxygen levels and water quality
  • Improve habitat for native fish including stable flows to support Murray cod nesting
Gunbower Creek No
  • Maintain habitat and food resources for native fish and support breeding and larval survival
Lower Broken Creek N/A
  • Provide native fish passage through fish ladders
  • Reduce stagnation in weir pools
  • Provide habitat for platypus, fish and turtles
Loddon River N/A
  • Increase small and large bodied fish populations
  • Maintain the condition of streamside and instream vegetation
  • Maintain water quality to support aquatic animals
Lower Murray Yes
  • Improve hydraulic conditions in the Lower Murray to support riverine function and breeding by large-bodied native fish
Lock 6 weir pool lowering Yes
  • Dry and consolidate sediments that are inundated at normal pool-level
  • Promote cycling of carbon and nutrients and improve productivity within the river littoral zone, anabranches, floodplain and wetlands
  • Support riverine ecological processes in the main channel through increased flow velocity, turbulence and matter transport
Lower Lakes, Coorong and Murray Mouth Yes
  • Provide cues for movement and recruitment of diadromous fishes, such as lamprey and congolli
  • Salt export via the Murray Mouth
  • Improve water quality in the Coorong to support native fish, plants, invertebrates and waterbirds
  • Maintain water levels in the Coorong in spring to support ruppia (and other associated macrophytes) growth
  • Recruitment of estuarine fish such as black bream