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River Murray System Annual Operating Plan 2018-19 water year 1 June 2018 31 May 2019 July 2018

MurrayDarling Basin Authority River Murray System Annual Operating Plan ii

Published by the MurrayDarling Basin Authority MDBA publication no: 22/18 ISBN (online): 978-1-925599-91-6

MurrayDarling Basin Authority 2018 Ownership of intellectual property rights

With the exception of the Commonwealth Coat of Arms, the MDBA logo, trademarks and any exempt photographs and graphics (these are identified), this publication is provided under a Creative Commons

Attribution 4.0 licence. (https://creativecommons.org/licenses/by/4.0)

The Australian Government acting through the MurrayDarling Basin Authority has exercised due care and skill in preparing and compiling the information and data in this publication. Notwithstanding, the MurrayDarling Basin Authority, its employees and advisers disclaim all liability, including liability for negligence and for any loss, damage, injury, expense or cost incurred by any person as a result of accessing, using or relying upon any of the information or data in this publication to the maximum extent permitted by law.

The MurrayDarling Basin Authoritys preference is that you attribute this publication (and any MurrayDarling Basin Authority material sourced from it) using the following wording within your work:

Cataloguing data Title: River Murray System Annual Operating Plan, MurrayDarling Basin Authority Canberra, 2018. CC BY 4.0

Accessibility The MurrayDarling Basin Authority makes its documents and information available in accessible formats. On some occasions the highly technical nature of the document means that we cannot make some sections fully accessible. If you encounter accessibility problems or the document is in a format that you cannot access, please contact us.

Acknowledgement of the Traditional Owners of the MurrayDarling Basin The MurrayDarling Basin Authority pays respect to the Traditional Owners and their Nations of the MurrayDarling Basin. We acknowledge their deep cultural, social, environmental, spiritual and economic connection to their lands and waters.

The guidance and support received from the Murray Lower Darling Rivers Indigenous Nations, the Northern Basin Aboriginal Nations and our many Traditional Owner friends and colleagues is very much valued and appreciated.

Aboriginal people should be aware that this publication may contain images, names or quotations of deceased persons.

GPO Box 1801, Canberra ACT 2601 1800 230 067

engagement@mdba.gov.au mdba.gov.au

https://creativecommons.org/licenses/by/4.0https://creativecommons.org/licenses/by/4.0mailto:engagement@mdba.gov.aumailto:engagement@mdba.gov.auhttp://www.mdba.gov.au/http://www.mdba.gov.au/

MurrayDarling Basin Authority River Murray System Annual Operating Plan iii

Contents 1 Introduction ..................................................................................................................................... 1

2 Objectives and constraints .............................................................................................................. 4

2.1 Key objectives .......................................................................................................................... 4

2.2 System attributes .................................................................................................................... 5

3 Water availability ............................................................................................................................ 8

3.1 Review of 2017-18 system inflows and storage levels ............................................................ 8

4 System status as of 1 June 2018 .................................................................................................... 11

4.1 Active storage as of 1 June 2018 ........................................................................................... 11

4.2 Critical human water needs and conveyance reserve .......................................................... 12

5 Annual Operating Plan assumptions for 2018-19 ......................................................................... 13

5.1 Scenario Approach ................................................................................................................ 13

5.2 River Murray system scenarios for 201819 ........................................................................ 14

5.3 Conveyance losses ................................................................................................................. 15

5.4 Storage losses ........................................................................................................................ 17

5.5 South Australias Storage Right (Schedule G) ....................................................................... 18

5.6 Scenario Updates................................................................................................................... 19

5.7 Limitations ............................................................................................................................. 19

6 Summary of water sharing across the scenarios ........................................................................... 20

7 System operations ......................................................................................................................... 22

7.1 Climate outlook ..................................................................................................................... 22

7.2 Significant operations ............................................................................................................ 22

7.3 Expected minimum flow rates .............................................................................................. 25

7.4 Weir pool level manipulation ................................................................................................ 25

7.5 Delivering environmental water ........................................................................................... 28

Release of environmental water from Hume Reservoir................................................ 28

Barmah-Millewa Forest ................................................................................................. 29

Environmental inflows from the Goulburn River .......................................................... 32

Environmental inflows from the Murrumbidgee River ................................................. 32

Gunbower Creek and Gunbower Forest ....................................................................... 32

KoondrookPerricoota Forest ....................................................................................... 33

Watering of Hattah Lakes .............................................................................................. 33

Watering in the Lindsay-Wallpolla-Mulcra icon site ..................................................... 33

Watering of the lower Darling and Great Darling Anabranch ....................................... 34

MurrayDarling Basin Authority River Murray System Annual Operating Plan iv

Environmental water delivered to South Australia ....................................................... 34

Watering via Chowilla works ......................................................................................... 35

7.6 Capacity considerations ........................................................................................................ 35

7.7 Barmah Choke trade restriction ............................................................................................ 37

7.8 Snowy Mountains Scheme .................................................................................................... 37

8 Scenario graphs ............................................................................................................................. 39

8.1 Dartmouth Reservoir ............................................................................................................. 39

8.2 Hume Reservoir and flow at Doctors Point ........................................................................... 41

8.3 Lake Mulwala and the Barmah Choke ................................................................................... 44

Winter and spring .......................................................................................................... 44

Summer and autumn ..................................................................................................... 46

8.4 Euston Weir flow ................................................................................................................... 47

8.5 Lake Victoria .......................................................................................................................... 48

8.6 Menindee Lakes Storage ....................................................................................................... 50

Releases from the Menindee Lakes Storage ................................................................. 51

8.7 Flow to South Australia ......................................................................................................... 53

8.8 Lower Lakes and Barrage operation ...............................................................

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