Constraints relaxation in the NSW southern connected Murray Darling Basin
What is a constraint?
Under the Murray Darling Basin Plan, a constraint is a rule or structure which limits the volume and/or timing of the delivery of environmental water. Constraints can include physical structures (e.g. low-lying bridges), river management practices, and operational limits for river heights. Relaxing these constraints will:
- allow better outcomes to be achieved with environmental water, and;
- reduce the volume of water to be recovered to achieve environmental outcomes.
NSW constraints relaxation project
Implementation of constraints relaxation projects, agreed as part of the Constraints Measures Program under the Sustainable Diversion Limit Adjustment Mechanism (SDLAM), will determine impacts of increased flow rates required to deliver environmental water, negotiate preferred risk mitigation options with impacted landholders, and deliver on ground works to mitigate risks and remove constraints. In the southern connected Murray-Darling Basin there are four NSW SDLAM projects that will be the focus of constraints relaxation:
- Hume to Yarrawonga reach of the Murray River (co-proponents with Victoria)
- Yarrawonga to Wakool reach of the Murray River
- Murrumbidgee key focus area
- Lower Darling constraints measure (as part of the Menindee Lakes Water Saving Project)
|Reach||Current max regulated flow (ML/d)||Notified Flow rate ML/d (including buffer)||Potentially impacted properties/entities|
|Hume to Yarrawonga reach of the Murray||25,000ML at Doctor’s point||40,000 at Doctor’s Point|
NSW - 101
Victoria - 106
|Yarrawonga to Wakool reach of the Murray River||15,000-18,000 downstream Yarrawonga||30,000 (50,000) downstream Yarrawonga|
NSW – 1649
Victoria - 118
|Murrumbidgee key focus area||32,000* ML/d at Wagga Wagga||40,000 (45,000) at Wagga Wagga||1140|
|Lower Darling constraints measure||5,000 ML at Menindee Outlet||14,000ML at Menindee Outlet||210|
To ensure all unacceptable impacts are identified prior to implementation, the NSW Government will undertake a substantial community engagement as part of the planning phase for each of the projects. The department is now undertaking early planning towards this engagement process.
Independent Expert Panel
View further information on the Independent review into MDBA constraints modelling.