Murray–Darling Basin
5.1 Surface water allocation remaining

Supporting information

The volumetric value for the line item for the 2012–13 year was 4,204,314 ML. The line item represents surface water allocation remaining (excluding urban water systems) associated with a number of entitlement classes in the Murray–Darling Basin (MDB) region as at 30 June 2013. Information on surface water allocation remaining for urban water systems is included in line item 5.2 Surface water allocation remaining–urban water system.


Water allocation carry-over

The following two tables provide a summary and breakdown information on surface water allocation carry-over (excluding urban water systems) within the region. 

 

Summary of surface water allocation carry-over (excluding urban water systems) in the MDB region at the start and end of the 2012–13 year
Surface water resource plan area

State/Territory

 Volume on 30 June 2013 (ML)

 Volume on 30 June 2012 (ML)

 Code

Name

SW20 Warrego–Paroo–Nebine Qld

0

0

SW19 Condamine–Balonne Qld

16,915

16,915

SW18 Moonie Qld

n/a

n/a

SW17 Qld Border Rivers Qld

0

0

SW16 NSW Border Rivers NSW

187,753

211,447

SW12 Barwon–Darling Watercourse NSW

n/a

n/a

SW13 NSW Intersecting Streams NSW

n/a

n/a

SW15 Gwydir NSW

552,401

758,824

SW14 Namoi NSW

305,620

450,982

SW11 Macquarie–Castlereagh NSW

305,633

654,501

Sub-total Northern Basin

1,368,322

2,092,669

SW10 Lachlan NSW

501,365

853,786

SW9 Murrumbidgee NSW NSW

357,642

600,396

SW8 NSW Murray and Lower Darling NSW

226,948

811,097

SW3 Northern Victoria Vic.

581,740

1,153,512

SW2 Vic. Murray Vic.

985,663

1,635,861

SW4 Wimmera–Mallee  Vic.

182,634

150,131

SW7 Eastern Mount Lofty Ranges SA

SW5 SA Murray Region SA

SW6 SA River Murray SA

SW1 ACT  ACT

n/a

n/a

Sub-total Southern Basin

2,835,992

5,204,783

Total for the region

4,204,314

7,297,452

  – = Data not available

 

Details of surface water allocation carry-over (excluding urban water systems) in the MDB region at the start and end of the 2012–13 year
Water resource plan area

Sustainable diversion limit area

State

Entitlement class

 Volume on 30 June 2013 (ML)

 Volume on 30 June 2012 (ML)

Code

Name

SW20 Warrego–Paroo–Nebine SS28 Warrego Qld Supplemented 0 0
SW19 Condamine–Balonne SS26  Condamine–Balonne  Qld Supplemented 16,915 16,915
SW17 Qld Border Rivers SS24 Qld Border Rivers Qld Supplemented 0 0
 Sub-total Queensland 16,915 16,915
SW16 NSW Border Rivers SS23 NSW Border Rivers  NSW High security 0 0
General security 187,753 211,447
Stock and domestic 0 0
Sub-total 187,753 211,447
SW15 Gwydir SS22 Gwydir  NSW High security 0 0
General security 552,404 758,824
Stock and domestic (3) 0
High security– research 0 0
Sub-total  552,401 758,824
SW14 Namoi SS21 Namoi  NSW High security 0 0
General security 305,620 450,982
Stock and domestic 0 0
High security– research 0 0
Sub-total  305,620 450,982
SW11 Macquarie–Castlereagh SS20 Macquarie–Castlereagh  NSW High security (32) 0
General security 305,665 654,501
Stock and domestic 0 0
High security– research 0 0
Sub-total  305,633 654,501
SW10 Lachlan SS16 Lachlan NSW High security 84 0
General security 501,289 835,883
Stock and domestic (8) (8)
Conveyance 0 17,911
Sub-total  501,365 853,786
SW9 Murrumbidgee NSW SS15 Murrumbidgee NSW NSW High security (21) 36
General security 340,276 510,945
Stock and domestic 0 0
Conveyance 17,387 89,415
High security– research 0 0
High security– Aboriginal cultural 0 0
Sub-total  357,642 600,396
SW8 NSW Murray and Lower Darling SS18 Lower Darling NSW High security 0 0
General security 18,210 56,543
Stock and domestic 0 0
Sub-total  18,210 56,543
SS14 NSW Murray NSW High security (267) (141)
General security 209,010 759,831
Stock and domestic (5) (35)
Conveyance 0 (5,101)
High security– research 0 0
High security– Aboriginal cultural 0 0
High security– community & education 0 0
Sub-total  208,738 754,554
 Sub-total New South Wales 2,437,362 4,341,033
SW3 Northern Victoria SS4 Ovens Vic. High reliability water share 50 0
SS5 Broken Vic. Combined high and low reliability 8,668 9,753
SS6 Goulburn Vic. Combined high and low reliability 418,840 758,538
SS7 Campaspe Vic. Combined high and low reliability 88,717 198,977
SS8 Loddon Vic. Combined high and low reliability 65,465 186,244
SW2 Vic. Murray SS2 Vic. Murray Vic. Combined high and low reliability 985,663 1,635,861
SW4 Wimmera–Mallee SS9 Wimmera–Mallee Vic. High reliability water share 182,634 150,131
 Sub-total Victoria 1,750,037 2,939,504
SW7 Eastern Mount Lofty Ranges SS13 Eastern Mount Lofty Ranges SA Regulated

unregulated

Sub-total 0 0
SS12 Marne Saunders SA Regulated

unregulated

Sub-total  

SW5 SA Murray Region SS10 SA Non-prescribed areas SA Regulated

unregulated

Sub-total  

SW6 SA River Murray SS11 SA Murray SA Class 1–Stock and domestic 0 0
Class 3–Irrigation and holding  0 0
Class 4– Recreation 0 0
Class 5–Industrial 0 0
Class 7– Environment 0 0
Class 8– Environmental land management 0 0
Combined classes metered 0 0
Combined classes unmetered 0 0
Sub-total  0 0
 Sub-total South Australia 0 0
Total for the region 4,204,314 7,297,452

 – = Data not available

Surface water allocation remaining volumes provided in the above tables include environmental water carry-over volumes. New South Wales and Victoria reported 387,760 ML and 304,348 ML respectively at end of the 2012–13 as environmental water carry-over volumes.

Queensland

In Queensland, the resource operation plans (ROPs) distinguish between 'high and medium priority of supplemented water allocation'. The water audit monitoring (WAM) data are the data source for the 2013 Account and only distinguishes between 'supplemented' and 'unsupplemented' entitlements. Both urban and non-urban entitlements are included within the supplemented entitlement class. Supplemented urban and supplemented non-urban volumes on allocations, diversions and other attributes were received together and it was not possible to separate out these two types of entitlements. Therefore, this line item includes remaining allocation volumes for both urban (if any, normally forfeited) and non-urban supplemented entitlements.    

Carry-over did not apply in the water resources planning (WRP) areas within Queensland in the 2012–13 except in St George (Condamine–Balonne sustainable diversion limit [SDL] area), Border Rivers and Macintyre Brook (Queensland Border Rivers SDL area) water supply schemes which are continuous share schemes.

The water supply system associated with Beardmore storage in Condamine–Balonne SDL area is predominantly a capacity share scheme and doesn't have an annual announced allocation. Announced allocation is calculated on use plus available water remaining at the end of the water year. Therefore, carry-over in this system does not relate to bringing forward unused allocation.  Rather, it provides for the resource cap to be increased in the current year dependent on water use in the previous year.

For the Queensland Border Rivers SDL area, allocation announcement includes both the allocation announcement during the year and the remaining water available at the end of the previous year. No information was available to separate the water available at the end of the previous year from the allocation announced during the year. 

 

New South Wales

Allocations remaining for several stock and domestic entitlements in Macquarie–Castlereagh, Lachlan, and New South Wales Murray SDL areas, and conveyance entitlements in New South Wales Murray SDL area were negative volumes. This could be due to:

  • overdraft of surface water allocation (advance drawing)
  • overuse breach of licence condition
  • an accounting/licensing anomalies arising as a result of (a) some entitlement holders' licence accounts were not updated to accommodate late transactions at the time of collecting data for this line item; and  (b) the entitlement holder holds many licences but the accounting was on one licence only (the anomalies continue until consolidating licences and fixing in the database occurs).

New South Wales carry-over volumes provided in this line item include environmental water allocation remaining volumes.

 

Victoria

All the allocation remaining as at 30 June 2013 was eligible for carry-over. In the Goulburn, Murray, and Campaspe systems if the total volume of carry-over is greater than the sum of the high- and low-reliability water shares, then this excess is placed in a spillable water account (SWA). From the start of the 2011–12 year, the SWA water only becomes available when the resource manager declares there is a low risk of spilling.  All other carry-over is available for use immediately.

In Victoria, once an allocation is made to an allocation account it no longer has the characteristic of being either high or low reliability. Therefore, all allocation remaining volumes were reported as combined high and low reliability water share.

Victorian carry-over volumes provided in this line item include environmental water allocation remaining volumes.

Victorian carry-over volumes provided in this line item also include any carry-over volumes for urban systems.  Reliable information distinguishing urban carry-over volumes was not available.


South Australia

No carry-over was permitted for South Australian Murray at the end of the 2012–13 year.

Quantification approach

Data source

(1) New South Wales Office of Water's Water Accounting section: New South Wales data; and (2) Murray–Darling Basin Authority: WAM data received from Queensland (5 February 2014), South Australia (17 March 2014), and Victoria (14 February 2014). WAM data are stored in the Murray–Darling Basin Authority HYDRO database.

Provided by

Bureau of Meteorology (the Bureau).

Method

Water sharing plans, water resource plans and the water legislation of each state specify:

  • the classes of licences that are permitted to carry forward any unused volumes
  • rules attached to the volume that may be carried forward.
Allocation remaining (carry-over) volumes and allocation diversion (overdraw) of surface water allocation remaining were as calculated by the States.

Assumptions, limitations, caveats and approximations

  • Uncertainty reported by New South Wales Office of Water accounts for possible errors in quantification of diversions and data handling processes.
  • Only New South Wales and Queensland carry-over data is shown by a specific security class. This reflects the carry-over rules in the water resource plans.
  • The line item value was an over-estimation as a result of including Victorian urban carry-over volumes.
  • Information provided in this line item may have been based on Cap valleys in the HYDRO database which may not align perfectly with SDL areas.

Uncertainty information

  • The uncertainty value for the New South Wales data provided in this line item is +/–10%.
  • For the other data provided in this line item, the uncertainty estimate was not quantified.

 

Comparative year

Prior period errors and availability of updated information resulted in the restatement of the 2011–12 year volume. The respective volumes associated with the change are detailed in the following table.

 

Restatement of comparative year information made for the line item 5.1 Surface water allocation remaining
Segment

Volume at 30 June 2012 reported in the 2013 Account (ML)

Volume at 30 June 2012 reported in the 2012 Account (ML)

Difference due to prior period errors and availability of updated information (ML)

Northern Basin 2,092,669 2,090,549 2,120
Southern Basin 5,204,783 4,909,329 295,454
Whole region 7,297,452 6,999,878 297,574


Values reported in the 2012 Account were updated due to the following reasons:

  • Values for several entitlement classes were updated for New South Wales and Victorian SDL areas. These updates were based on reconciling accounting/licensing anomalies, and errors in entitlement holder licence accounts.