Murray–Darling Basin
13.1 Adjustment and forfeiture of surface water allocation

Supporting information

The volumetric value for the line item for the 2011–12 year was 2,176,027 ML. The line item does not include details for urban water systems. They are included in line item 13.2 'Adjustment and forfeiture of surface water allocation – urban water system'.


Adjustment and forfeiture of surface water allocation

The following two tables provide a summary and breakdown information on adjustment and forfeiture of surface water allocation (excluding urban water systems) within the region. 


Summary of adjustment and forfeiture of surface water allocation (excluding urban water systems) in the Murray–Darling Basin (MDB) region
Surface water resource plan area State/Territory  Volume (ML) for the 2011–12 year 
 Code

Name

SW19 Warrego–Paroo–Nebine Qld 1039
SW18 Condamine–Balonne Qld 4,673
SW17 Moonie Qld n/a
SW16 Qld Border Rivers Qld 74646
SW15 NSW Border Rivers NSW 8,787
SW11 Barwon–Darling Watercourse NSW n/a
SW12 NSW Intersecting Streams NSW n/a
SW14 Gwydir NSW 14,846
SW13 Namoi NSW 37,895
SW10 Macquarie–Castlereagh NSW 23,258
Sub-total Northern Basin 165,143
SW9 Lachlan NSW 511,306
SW8 Murrumbidgee NSW NSW 425,610
SW7 NSW Murray and Lower Darling NSW 206,304
SW3 Northern Victoria Vic. 278,569
SW2 Vic. Murray Vic. (65,469)
SW4 Wimmera–Mallee Vic. 49,553
SW6 Eastern Mount Lofty Ranges SA
SW5 SA Murray SA 605,011
SW1 ACT ACT n/a
Sub-total Southern Basin 2,010,884
Total for the region 2,176,027


– = Data not available

Details of adjustment and forfeiture of surface water allocation (excluding urban water systems) in the MDB region
Water resource plan area

Sustainable diversion limit (SDL) area

State

Entitlement class

 Volume (ML) for the 2011–12 year 

Code

Name

SW19 Warrego–Paroo–Nebine SS28 Warrego Qld Supplemented 1,039
SW18 Condamine–Balonne SS26  Condamine–Balonne  Qld Supplemented 4,673
SW16 Qld Border Rivers SS24 Qld Border Rivers Qld Supplemented 74,646
 Sub-total Queensland 80,358
SW15 NSW Border Rivers SS23 NSW Border Rivers  NSW High security 427
General security 7,783
Stock and domestic 577
Sub-total 8,787
SW14 Gwydir SS22 Gwydir  NSW High security 8,918
General security 3,604
Stock and domestic 2,264
High security – research 60
Sub-total  14,846
SW13 Namoi SS21 Namoi  NSW High security 804
General security 35,340
Stock and domestic 1,748
High security – research 3
Sub-total  37,895
SW10 Macquarie–Castlereagh SS20 Macquarie–Castlereagh  NSW High security 6,929
General security 8,667
Stock and domestic 4,273
High security – research 3,389
Sub-total  23,258
SW9 Lachlan SS16 Lachlan NSW High security 12,107
General security 486,618
Stock and domestic 11,567
Conveyance 1,014
Sub-total  511,306
SW8 Murrumbidgee NSW SS15 Murrumbidgee NSW NSW High security 10,023
General security 382,639
Stock and domestic 12,289
Conveyance 19,168
High security – research 2
High security – Aboriginal cultural 1,489
 Sub-total  425,610
SW7 NSW Murray and Lower Darling SS18 Lower Darling NSW High security 1,351
General security 27,462
Stock and domestic 811
 Sub-total  29,624
SS14 NSW Murray NSW High security 56,590
General security 111,764
Stock and domestic 7,505
Conveyance 0
High security – research 800
High security – Aboriginal cultural 0
High security – Community & education 22
Sub-total  176,681
 Sub-total New South Wales 1,228,005
SW3 Northern Victoria SS4 Ovens Vic. High reliability water share 19,595
SS5 Broken Vic. Combined high and low reliability 5,708
SS6 Goulburn Vic. Combined high and low reliability 182,032
SS7 Campaspe Vic. Combined high and low reliability 63,440
SS8 Loddon Vic. Combined high and low reliability 7,794
SW2 Vic Murray SS2 Vic. Murray Vic. Combined high and low reliability –65,469
SW4 Wimmera–Mallee SS9 Wimmera–Mallee Vic. High reliability water share 49,553
 Sub-total Victoria 262,653
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

Class 3 – Irrigation and holding 

Class 4 – Recreation

Class 5 – Industrial

Class 7 – Environment

Class 8 – Environmental land management

Combined classes metered 605,011
Combined classes unmetered

Sub-total  605,011
SS10 SA Non-prescribed areas SA Regulated

unregulated

Sub-total   0
SW6 Eastern Mount Lofty Ranges SS12 Marne Saunders SA Regulated

unregulated

Sub-total   0
 Sub-total South Australia
605,011
Total for the region 2,176,027

– = Data not available

Adjustment and forfeiture volumes provided in this line item include environmental water adjustment and forfeiture 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 which are the data source for the 2012 Account only distinguishes between 'supplemented' and 'unsupplemented' entitlements. Both urban and non-urban supplemented 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 not possible to be separated out for the two purposes. Therefore, this line item includes adjustment and forfeiture volumes for both urban and non-urban supplemented entitlements.

For continuous accounting systems in Condamine–Balonne and Border Rivers, it was not possible to calculate the adjustment and forfeiture volumes due to lack of information.

 New South Wales

Usually unused allocation balances are forfeited for entitlement classes: stock and domestic, community and education, and research and Aboriginal culture. In some cases, the allocation may be overdrawn and the balance is shown in line item 5.1 'Surface water allocation remaining'.

In the Murrumbidgee WRP area, irrigators may 'borrow' water from the Snowy Scheme. This borrow is made under a contractual agreement between the irrigator and the Snowy Scheme. The volume contracted is then credited by New South Wales Office of Water (NOW) to the individual account of the irrigator, allowing the irrigator to order water from the water assets administered by NOW. In parallel, the Snowy Scheme transfers the physical water into Blowering Reservoir in the Murrumbidgee WRP area. When the irrigator is able in subsequent years to repay the debt, they notify NOW, which debits the account from the volume previously borrowed, thus reducing the allocation announced earlier in the year. Line item 1.5 'Inter-region claim on water' provides details of the inter-region transfers from Snowy Hydro.


Victoria

Victorian allocation adjustment and forfeiture are shown in the source valley, even though the water was taken in a different destination valley. Therefore all entitlements in the Goulburn SDL area have their allocation adjustments and forfeiture shown in that area, rather than the destination valleys of the Loddon or the Campaspe.

In Victoria, once an allocation has been made, regardless of its class, it goes into a single allocation account. Therefore, adjustment and forfeiture volumes are not specified as high reliability water share or a low reliability water share and are reported as combined high and low reliability water share.

More details on Victorian adjustment and forfeiture volumes are provided in the following table.


Surface water allocation forfeiture details – Victoria
Sustainable diversion limit (SDL) area

Total forfeiture at end of the 2011–12 year (ML)

Environmental forfeiture volume included in the total forfeiture volume (ML)

Ovens 19,595 0
Broken 5,708 0
Goulburn 182,032 199,829
Campaspe 63,440 10,678
Loddon 7,794 0
Vic. Murray (65,469) 147,179
Wimmera–Mallee 49,553 23,863
All 262,653 381,549

South Australia

No carry-over was permitted for South Australian Murray at the end of the 2011–12 year. In this line item for South Australia, adjustment and forfeiture volumes include the classes 3, 4, 7 and 9 as a 'combined class'. Carry-over is not allowed for classes 1, 5 and 8, and therefore all unused water within these classes is forfeited.

 

Quantification approach

Data source

(1) New South Wales Office of Water: water accounting section; and (2) Murray–Darling Basin Authority: water audit monitoring (WAM) data received from Queensland (4 February 2013), South Australia (15 March 2013) and Victoria (21 March 2013), and stored in the HYDRO database.

Provided by

Bureau of Meteorology (the Bureau).

Method

  • The New South Wales Office of Water supplied data prepared on a water balance approach. The forfeitures and adjustments have been checked to ensure that the closing balance reconciles.
  • Adjustment and forfeiture for Queensland was calculated using WAM data on a water balance approach. The forfeitures and adjustments have been checked to ensure that the closing balance reconciles. Adjustment and forfeiture does not apply in the St George (Condamine–Balonne SDL area), Border Rivers and Macintyre Brook (Queensland Border Rivers SDL area) water supply schemes which are continuous share schemes
  • Adjustment and forfeiture for South Australia was calculated using WAM data on a water balance approach. The forfeitures and adjustments have been checked to ensure that the closing balance reconciles.
  • Victorian adjustment and forfeiture was calculated applying a water balance approach to WAM data..

Assumptions, limitations, caveats and approximations

  • Uncertainty reported by New South Wales Office of Water accounts for possible errors in the quantification of diversion and in the data handling processes.
  • 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

WAM supplied data are either measured, modelled or estimated. The uncertainty value for the New South Wales data provided in this line item is +/– 10%. The uncertainty estimate was not quantified for all other adjustment and forfeiture volumes reported in this line item.

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 13.1 Adjustment and forfeiture of surface water allocation
Segment 2012 Account volume for the 2010–11 year (ML) 2011 Account volume for the 2010–11 year (ML) Difference due to availability of updated information (ML)
Northern Basin 187,573 187,947 –374
Southern Basin 1,136,827 1,406,752 –269,925
Whole region 1,324,400 1,594,699 –270,299


Values reported in the 2011 Account were updated due to the following reasons:

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