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In 2019, the MDBA undertook a detailed survey of the River Murray channel through the Barmah–Millewa Reach. This revealed the presence of a very large quantity of sand on the bed of the river, something that was not expected. Since then, several further studies have been undertaken to investigate the extent and source of the sand, the rate that it is moving at and options to manage it. Reports of these studies are provided below.

Over recent years there have been significant changes on the River Murray, including expansion of permanent horticulture, recovery of water for the environment, increased trade and reduced channel capacity through the Barmah–Millewa forest. These changes have resulted in concerns that the river system will not be able to deliver water allocation to users when they need it.