Border Rivers catchment

In 2022–23, water managers will focus their efforts on supporting native fish populations in the Severn, Dumaresq, Macintyre and upper Barwon rivers.

View from Mole River bridge of kayakers paddling upstream with grassy banks and trees in the backgroundThe NSW Border Rivers catchment covers an area of 24,000 square kilometres. The catchment hugs the Queensland border and is influenced by the management of water on both sides of the border.

Pindari Dam, on the Severn River (NSW), and Glenylon Dam, on Pike Creek (Queensland), are 2 of the major water storages influencing the catchment. Morella Watercourse, Boobera Lagoon and Pungbougal Lagoon located on the Macintyre River floodplain are important cultural sites for Aboriginal people. These wetlands are also listed as a site of national importance in the Directory of Important Wetlands in Australia. The Traditional Owners of the Border Rivers are the Bigambul, Euahlayi, Githabul, Kambuwal, Gomeroi/Kamilaroi, Kwiambul, and Ngarabal.

Water for rivers and wetlands

In 2022–23, water managers will focus their efforts on supporting native fish populations in the Severn, Dumaresq, Macintyre and upper Barwon rivers.

In the catchment, the volume of water for the environment is limited. The Department of Planning and Environment (the department) works in partnership with the Commonwealth Environmental Water Holder to manage available resources.

The Pindari Stimulus Flow is a small volume of planned water available for use if triggered by inflows into Pindari Dam. If made available, it may be used to target native fish outcomes downstream.

Not all environmental demands can be met by water for the environment. Some demands may be met by regulated water deliveries for consumptive purposes, while others may be met by unregulated (natural flow) events. In any given year, environmental demands may not be met.

Generally, the maximum peak delivery of water for the environment in the NSW Border Rivers is limited to a large fresh event.

Weather and water forecast

The El Niño–Southern Oscillation (ENSO1) outlook remains at La Nina, with a return to neutral ENSO during winter. However, atmospheric indicators remain above La Nina threshold, meaning the La Nina influence continues.

The short-term rainfall outlook is likely to be above median for the Border Rivers which will maintain the current soil moisture and run-off efficiency in the catchment.

Water managers have prepared watering plans that consider a range of weather and water availability scenarios. This is known as resource availability scenario planning. As dam levels remain high, the Border Rivers catchment outlook is rated as ‘wet to very wet’ for the 2022–23 water year.

1 ENSO: The interaction between the sea surface and atmosphere over the Pacific Ocean which results in dryer or wetter conditions (El Nino or La Nina).

Resource availability scenario

 Dry river reaches in lower Mehi near Collarenebri gauge 2

Very dry

Main aim: Protect

Avoid critical loss
Maintain key refuges
Avoid catastrophic events

 Red Gum, "Hells Gate", now called "Black Rocks", Darling River

Dry

Main aim: Maintain

Maintain river functioning
Maintain key functions of high priority wetlands

 Macquarie River Trail, Dubbo

Moderate

Main aim: Recover

Improve ecological health and resilience
Improve opportunities for plants and animals to breed, move and thrive

 Lower Murray

Wet to very wet

Main aim: Enhance

Restore key floodplain and wetland linkages
Enhance opportunities for plants and animals to breed, move and thrive

Key planned actions for 2022–23

 

Waterbird icon

Waterbirds

Waterbirds will benefit from any actions taken under the connectivity and native fish actions listed below if delivered.

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Native fish

Water managers may use water for the environment to support native fish movement, breeding and recruitment outcomes in the Dumaresq River downstream of Glenlyon Dam and in the Severn and Macintyre rivers downstream of Pindari Dam.

Native fish will also benefit from any delivery events targeting connectivity.

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Vegetation

Riparian and aquatic vegetation will benefit from any events under the connectivity and native fish actions if delivered.

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Connectivity

Water managers may use available held water for the environment to provide a low connection flow along the Dumaresq and Macintyre–Barwon system to replenish and refresh pools if more water becomes available in the storages.

If moderate sized natural events occur, water managers may add water to extend the duration of the event and/or increase the distance this water will reach downstream. If practical, they may release held water for the environment to increase the peak flow to inundate higher benches and low anabranches and their connected wetlands.

If larger natural events occur, the use of NSW supplementary and Queensland unsupplemented licences can retain a further proportion of these flows instream.

Figure 1 Map of proposed annual priority targets in the Border Rivers Water Resource Plan area 2022–23

Map of the Border Rivers Water Resource Plan area 2022–23

The Department of Planning and Environment (the department) is supporting the health and resilience of rivers and wetlands by delivering water for the environment where and when it is needed. We use the best available science, management expertise and experience to manage water across the landscape. This statement of annual priorities identifies the waterways and wetlands that are likely to receive water.

Our decision-making process considers:

  • expected availability of water in the coming year
  • conditions of the previous year
  • current health of the plants and animals in these ecosystems.

The NSW Government works with the Commonwealth Environmental Water Holder to manage water in the catchment.

In other catchments, we utilise Environmental Water Advisory Groups (EWAG) to help make decisions on the use of water for the environment. While the Border Rivers catchment doesn’t currently have an EWAG, the intention is to establish one soon.

First Nation objectives in the catchment are outlined in the Aboriginal Environmental Water Priorities.


Water for the environment is a share of the water in dams and rivers that is set aside to support the long-term health of local rivers, creeks and wetlands. Healthy rivers carry water to homes, farms, schools and businesses. Rivers and wetlands are important cultural and spiritual sites for Aboriginal people, as well as the broader community.

Source

Maximum volume available
(gigalitres – GL)

Volume expected 1 July under current conditions (gigalitres – GL)

Planned environmental water

 

Discretionary Planned Environmental –
Pindari Stimulus Flow

8.0 GL 

8.0 GL

Water licenced to the Commonwealth

General security

2.806 GL

2.806 GL (TBC)

Supplementary

1.437 GL

Event-dependent

Medium (Qld)

15.54 GL

15.54 GL             

Unsupplemented (Qld)

19.986 GL

Event-dependent

Note: This is an indicative summary of expected volumes to be available. For further detail and information on available volumes, please contact the region via Department of Planning and Environment enquiries on 1300 361 967.
1 gigalitre = 1000 megalitres; 2.5 megalitre = 1 Olympic swimming pool.