Environmental Flows

Macquarie River Valley Update

19th October 2020 – The delivery of Commonwealth and NSW water for the environment from Burrendong Dam has begun, with water making its way through the mid-Macquarie River and into the Marshes. The flows aim to support the Murray cod nesting season in the mid-Macquarie River, help with drought recovery in the Macquarie Marshes, and improve connection with the Barwon River.

2020-21 Macquarie Water Use – Update 1

2020-21 Macquarie Water Use_Update 2_FINAL

Environmental water and conditions in the Gwydir system – 26 October 2020

Natural flows have been occurring along the Gwydir system after heavy rainfall events in late January and
February 2020 resulted in some higher flows and then natural flows continued with smaller events up into
October 2020.

Upcoming considerations for possible environmental water releases in the Gwydir system: Highest priority, Native fish support – low flow releases. If sections of the main rivers and creeks experience extended nil flow periods, then small environmental water releases are likely to be made from Copeton Dam.

Community update Gwydir 26 October 2020

Lower Balonne flow 2020

A collaborative effort between governments, local water licence holders and community representatives will see more water stay in our rivers on the back of recent rains in the area. The increased flows will reach the parched Lower Balonne system, including the internationally significant Narran Lakes, in early March. lower-balonne-flow-update-1 Lower Balonne Flow Update 2 v2

Gwydir Refuge Pool Flow 2019

Water for the environment is flowing through parts of the Gwydir valley to maintain critical river pool habitat for native fish. Very hot and dry conditions and limited water holdings will see water for the environment prioritised to keep large refuge pools in good condition. These low flows will target parts of the Gwydir and Mehi Rivers and the upper Carole Creek.

Gwydir refuge pool flow nov2019 update 1

Gaygay (catfish) started building nests in November after flows from Event #1 reached the Mehi River.

Flows from Event #1 reached Tyreel, Combadello Weirs and Carole Creek near Garah in early November.

Flows for Event #2, which is smaller than Event #1, commenced 9 December to top-up some important river pools in the Gwydir and Mehi systems.

Gwydir refuge pool flow dec2019 update 2

Northern Fish Flow 2018-19

The Barwon River in the northern Murray-Darling Basin has not flowed for over 200 days, drying back to poor quality waterholes, threatening the survival of native fish in the region.

To help native fish survive the drought the Commonwealth Environmental Water Office in partnership with the NSW Office of Environment and Heritage and other NSW agencies is releasing water for the environment from April to June to replenish critical waterholes.

Northern Fish Flow Update # 1

Northern Fish Flow Update # 2

Northern Fish Flow Update # 3

Northern Fish Flow Update # 4

Northern Fish Flow Update # 5

Water for native fish Mehi River flow

CEWH media Release 20190415

2018-19 Macquarie River and Marshes environmental watering

Commonwealth and NSW environmental water holders have agreed to deliver environmental water to the mid-Macquarie River and Marshes between winter and summer 2018-19 to maintain the ecological health and resilience of assets in the catchment. Environmental water will also help to maintain and improve the condition of wetland vegetation, and will provide benefits for native fish and waterbirds.

Update 1 – September 2018

Update 2 – October 2018

Update 3 – December 2018

The Northern Connectivity event from May 2018

Commonwealth and NSW environmental water holders have agreed to release water from storages in the Northern Murray-Darling Basin to support the environmental health of river systems including the Barwon-Darling down to Wilcannia and beyond. Come, learn and share about this important, participate in activities with river scientists and meet with other people who care about the health of these important rivers, and the fish and ecosystems which depend on them.







northern-connectivity-update- 7


Lachlan River Watering Event 2018-2019

Water is being delivered to the Lachlan River below Wyangala Dam in response to recent system inflows (runoff) triggered by rainfall. The event will assist to build on the inflows to mimic seasonal variability that is a natural occurrence in the Lachlan River and connecting wetlands including the Great Cumbung Swamp.

Lachlan_Dec 18

Namoi River 2018-2019

The Commonwealth Environmental Water Holder agreed to deliver environmental water to the lower Namoi River between November and December 2018, to protect the ecological health and resilience of aquatic ecosystems in the catchment. In particular, environmental water will be delivered to reconnect and maintain refuge pools, and to support native fish communities.

Namoi River 18-19 Update 1

Namoi River 18-19 Update 2

Namoi River 18-19 Update 3

Namoi River 18-19 Update 4

Gwydir Wetlands  2018-2019

The Commonwealth and NSW environmental water holders have agreed to deliver up to 60,000 megalitres (ML) of environmental water to the Gingham and Lower Gwydir wetlands in 2018-19. This watering event aims to help maintain the health and resilience of the Gwydir Wetlands during the current dry conditions. The delivery will support habitat and food sources for native fish, frogs, turtles, and waterbirds. Environmental water delivery commenced in mid-July, with the initial delivery pausing in late October to allow for harvest. Once harvest is complete environmental flows will likely resume during summer to build on outcomes from the spring delivery.

Gwydir Wetlands 18-19 Update 1

Gwydir Wetalnds 18-19 Update 2

Gwydir Wetlands 18-19 Update 3

Mallowa Wetlands 2018-2019

Up to 20,000 ML of Commonwealth water for the environment will be delivered into the Mallowa Creek during the 2018–19 water year. This water will improve the health of wetland vegetation along the length of the system. Water for the environment that is currently being delivered will meet the water requirements of more than 2,000 hectares of remaining wetland vegetation and enhance the condition of waterbird feeding habitat. These flows also support native fish populations along the Mehi River upstream of the Mallowa Creek offtake.

Mallowa Wetlands 18-19 Update 1

Mallowa Wetlands 18-19 Update 2

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