Murray–Darling Basin
5.1 Surface water allocation remaining

Supporting information

The volumetric value for the line item for the 2011–12 year was 6,999,878 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 2012. 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 2011–12 year
Surface water resource plan area

State/Territory

 Volume on 30 June 2012 (ML)

 Volume on 30 June 2011 (ML)

 Code

Name

SW19 Warrego–Paroo–Nebine Qld 0 0
SW18 Condamine–Balonne Qld 15,212 14,667
SW17 Moonie Qld n/a n/a
SW16 Qld Border Rivers Qld 0 0
SW15 NSW Border Rivers NSW 211,257 209,506
SW11 Barwon–Darling Watercourse NSW n/a n/a
SW12 NSW Intersecting Streams NSW n/a n/a
SW14 Gwydir NSW 758,824 342,553
SW13 Namoi NSW 450,972 255,402
SW10 Macquarie–Castlereagh NSW 654,284 519,557
Sub-total Northern Basin 2,090,549 1,341,685
SW9 Lachlan NSW 856,355 697,722
SW8 Murrumbidgee NSW NSW 617,984 602,218
SW7 NSW Murray and Lower Darling NSW 811,121 1,274,639
SW3 Northern Victoria Vic. 1,156,234 1,238,956
SW2 Vic. Murray Vic. 1,467,636 1,625,117
SW4 Wimmera–Mallee Vic. 0
0
SW6 Eastern Mount Lofty Ranges SA
SW5 SA Murray SA
SW1 ACT ACT n/a n/a
Sub-total Southern Basin 4,909,329 5,438,652
Total for the region 6,999,878 6,780,337

– = 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 2011–12 year
Water resource plan area

Sustainable diversion limit area

State

Entitlement class

 Volume on 30 June 2012 (ML)

 Volume on 30 June 2011 (ML)

Code

Name

SW19 Warrego–Paroo–Nebine SS28 Warrego Qld Supplemented 0 0
SW18 Condamine–Balonne SS26  Condamine–Balonne  Qld Supplemented 15,212 14,667
SW16 Qld Border Rivers SS24 Qld Border Rivers Qld Supplemented 0 0
 Sub-total Queensland 15,212 14,667
SW15 NSW Border Rivers SS23 NSW Border Rivers  NSW High security 0 0
General security 211,257 209,506
Stock and domestic 0 0
Sub-total 211,257 209,506
SW14 Gwydir SS22 Gwydir  NSW High security 0 0
General security 758,824 342,553
Stock and domestic 0 0
High security– research 0 0
Sub-total  758,824 342,553
SW13 Namoi SS21 Namoi  NSW High security 0 0
General security 450,972 255,402
Stock and domestic 0 0
High security– research 0 0
Sub-total  450,972 255,402
SW10 Macquarie–Castlereagh SS20 Macquarie–Castlereagh  NSW High security 0 0
General security 654,514 519,830
Stock and domestic –231 –273
High security– research 0 0
Sub-total  654,284 519,557
SW9 Lachlan SS16 Lachlan NSW High security 0 0
General security 838,451 684,158
Stock and domestic –7 0
Conveyance 17,911 13,564
Sub-total  856,355 697,722
SW8 Murrumbidgee NSW SS15 Murrumbidgee NSW NSW High security 0 –16
General security 528,569 509,015
Stock and domestic 0 0
Conveyance 89,415 93,219
High security– research 0  
High security– Aboriginal cultural 0  
Sub-total  617,984 602,218
SW7 NSW Murray and Lower Darling SS18 Lower Darling NSW High security 0 0
General security 56,643 50,831
Stock and domestic 0 0
Sub-total  56,643 50,831
SS14 NSW Murray NSW High security –141 86,385
General security 759,755 1,136,667
Stock and domestic –35 –119
Conveyance –5,101 41
High security– research 0 800
High security– Aboriginal cultural 0 0
High security– community & education 0 35
Sub-total  754,478 1,223,808
 Sub-total New South Wales
4,360,796 3,901,597
SW3 Northern Victoria SS4 Ovens Vic. High reliability water share 0 0
SS5 Broken Vic. Combined high and low reliability 9,753 10,067
SS6 Goulburn Vic. Combined high and low reliability 759,258 836,107
SS7 Campaspe Vic. Combined high and low reliability 198,978 212,682
SS8 Loddon Vic. Combined high and low reliability 188,245 180,100
SW2 Vic. Murray SS2 Vic. Murray Vic. Combined high and low reliability 1,467,636 1,625,117
SW4 Wimmera–Mallee SS9 Wimmera–Mallee Vic. High reliability water share 0
0
 Sub-total Victoria 2,623,870 2,864,073
SW6 Eastern Mount Lofty Ranges SS13 Eastern Mount Lofty Ranges SA Regulated
unregulated
Sub-total 0
SW5 SA 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
Class 9–Wetland Management

 0

0
Combined classes metered

 0

0
Combined classes unmetered

 0

0
Sub-total  0 0
SS10 SA Non-prescribed areas SA Regulated
unregulated
Sub-total  
SW6 Eastern Mount Lofty Ranges SS12 Marne Saunders SA Regulated
unregulated
Sub-total  
 Sub-total South Australia
0 0
Total for the region 6,999,878 6,780,337

– = Data not available


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 2012 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 2011–12 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 2012 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 (see the following table).

 

Surface water allocation remaining details – Victoria

 

Surface water allocation remaining details – Victoria
Sustainable diversion limit area

Carry-over from the 2010–11 year (ML)

Environmental carry-over volume included in the carry-over from the 2010–11 year (ML)

Estimated carry-over to the 2012–13 year

Environmental carry-over volume included in the estimated carry-over to the 2012–13 year

Ovens 0 0 0 0
Broken 10,067 0 9,753 0
Goulburn 836,107 94,437 759,258 43,747
Campaspe 212,682 7,448 198,978 0
Loddon 180,100 0 188,245 2,000
Vic. Murray 1,625,117 237,924 1,467,636 50,244
Wimmera–Mallee 0 0 0
0
All 2,864,073 339,809 2,623,870 95,991


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 2011–12 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 (4 February 2013), South Australia (15 March 2013) and Victoria (21 March 2013). 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

Availability of updated information resulted in the restatement of the 2010–11 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 2011 reported in the 2012 Account (ML)

Volume at 30 June 2011 reported in the 2011 Account (ML)

Difference due to availability of updated information (ML)

Northern Basin 1,341,685 1,341,311 374
Southern Basin 5,438,652 5,168,727 269,925
Whole region 6,780,337 6,510,038 270,299


Values reported in the 2011 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 in entitlement holder licence accounts.