Western Weirs Program

Western Weirs Program

WaterNSW is developing a Strategic Business Case (SBC) to examine the following overarching objectives of the Western Weirs Program:

  • Improve water security for towns in the far west region, including Aboriginal communities supplied by those towns.
  • Investigate infrastructure options that may improve the adaptive management of flows along the system.
  • Investigate weir ownership and future funding arrangements, including consideration of local and state government concerns on the cost of ongoing operations and maintenance of critical river infrastructure.


The NSW Government has committed approximately $4.2 million from Restart NSW Water Security for Regions for the development and submission of a Strategic Business Case (SBC). The Water Security for Regions Program aims to help regional communities improve water security.

There are currently 28 weirs that have been included in the study area under the following principles:

  • Weirs are located on the main stem river of the Barwon Darling or Lower Darling rivers in NSW between Mungindi and Wentworth; and
  • A weir that is on a tributary to the Barwon Darling River and its primary purpose is potable drinking water supply for local towns, or its proximity to Barwon Darling River provides an opportunity to investigate improved system functionality and environmental flows.

The current weir infrastructure is known to have a number of deficiencies from town water supply and security concerns, flow regulation limitations, poor condition, and in some cases unclear ownership and responsibility for maintaining them.

The Strategic Business Case will assess the feasibility of changing the operation of the existing river infrastructure by replacing existing fixed crest weirs with regulated or ‘gated’ weirs, altering the height of some weirs and possible removal of other weirs.

The approach aims to enable the management of flows along the system to support far western town water supplies and provide related socio-economic, environmental and cultural benefits. The project is closely aligned with the Western Regional Water Strategy that is being developed by the Department of Planning, Industry and Environment. The project will also be required to consider interactions with the Menindee Lakes SDLAM Project and projects to protect and enhance native fish outcomes, including fish passage.

Project details and benefits

If fully implemented, the Program is expected to deliver:

  • Protecting Aboriginal People’s rights, interests and access to water
  • Construction of new infrastructure to meet town water security needs, which may include an integrated system of gated weirs to replace the current fixed crest weirs along all or parts of the river, or other cost-effective alternatives.
  • Provision of fish passage on all new or augmented weirs
  • Removal of weirs and river structures that provide no effective water supply security outcomes and impede fish passage
  • Amendments to the Water Sharing Plans, if new infrastructure improves the opportunity for adaptive management of flows
  • Implementation of new ownership, maintenance, operations and cost recovery arrangements for infrastructure and operations along the river.

Contact Details

For more information about the project please contact us.


Friday 18 June
2,480,585 ML
2,581,850 ML
9,256 ML
1,323 ML
-782 ML
Friday 18 June