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This is a review of the hydrological models that underpin the Barwon-Darling Watercourse water resource plan that was submitted to the Murray–Darling Basin Authority in June 2020. The 2 most important of these models were the Baseline Diversion Limit model and the Annual Permitted Take model. This review was prepared to assist the Murray–Darling Basin Authority in their appraisal of the Barwon-Darling Watercourse water resource plan prior to its accreditation and implementation under the Basin Plan.

The River Murray Water Quality Monitoring Program has captured physical and chemical data from 28 River Murray and tributary sites since 1978. This report examines long-term trends in water quality and drivers of change.

The Barmah Choke has a default trade restriction in place. This is necessary to protect water delivery to existing water entitlement holders and maintain the river environment in the Choke.

The Barmah Choke is a naturally occurring narrow stretch of the River Murray. A default trade restriction is in place at the Choke to protect water delivery to existing entitlement holders and for environmental reasons.

Along with our river management partners, we use a variety of models to support the planning and running of the Murray–Darling Basin’s rivers.

A large number of water access rights are traded throughout the Basin. These rights all have different characteristics including priority, reliability and form of take.

To continue to support the efficient functioning of water markets in the River Murray system, the Murray–Darling Basin Authority and water agencies and authorities from New South Wales, Victoria and South Australia have been investigating better ways to make trade adjustments.

The Murray–Darling Basin Authority (MDBA) operates the River Murray to share water between New South Wales, Victoria and South Australia, as required under the Murray–Darling Basin Agreement. To undertake this work the MDBA has built, maintained and operated a hydrological model of the River Murray.

The operation of the Barmah Choke trade restriction is specified in the Permissible Transfers between Trading Zones Protocol 2010. The opening balance for the Choke water account on 1 July is based on the Snowy water savings that were realised downstream of the Choke in the previous water year and reflected in allocations against the Entitlement Record.

Water trade allows water holders to decide whether they need to buy or sell water at a particular time.