Murray–Darling Basin
21.2 Surface water allocation announcements – urban system

Supporting information

The volumetric value for the line item for the 2011–12 year was 582,020 ML for the Murray–Darling Basin (MDB) region. The line item represents surface water allocation announcements for urban water systems associated with a number of entitlement classes (596,160 ML) less net allocation trade outward (14,140 ML) in the MDB region.

The following two tables provide a summary and breakdown information on surface water allocation announcements for urban water systems within the region. 

 

Summary of surface water allocation announcements for urban water syatems in the MDB region
Water resource plan (WRP) area State/Territory  Volume (ML) for the 2011–12 year 

 Code

Name

SW19 Warrego–Paroo–Nebine Qld 0
SW18 Condamine–Balonne Qld 0
SW17 Moonie Qld n/a
SW16 Qld Border Rivers Qld 0
SW15 NSW Border Rivers NSW 620
SW11 Barwon–Darling Watercourse NSW 0
SW12 NSW Intersecting Streams NSW n/a
SW14 Gwydir NSW 3,836
SW13 Namoi NSW 19,186
SW10 Macquarie–Castlereagh NSW 18,845
Sub-total Northern Basin 42,487
SW9 Lachlan NSW 15,545
SW8 Murrumbidgee NSW NSW 42,725
SW7 NSW Murray and Lower Darling NSW 46,802
SW3 Northern Victoria Vic. 99,507
SW2 Vic. Murray Vic. 51,784
SW4 Wimmera–Mallee Vic. 47,310
SW6 Eastern Mount Lofty Ranges SA n/a
SW5 SA Murray SA 180,000
SW1 ACT ACT 70,000
Sub-total Southern Basin 553,673
Total for the region 596,160


Details of surface water allocation annoucemenrs for urban water systems in the MDB region
WRP area

Sustainable diversion limit (SDL) area

State/Territory

Entitlement class

 Volume (ML) for the 2011–12 year 

Code

Name

SW15 NSW Border Rivers  SS23 NSW Border Rivers  NSW Local water utility 620
SW14 Gwydir  SS22 Gwydir  NSW Local water utility 3,836
SW13 Namoi  SS21 Namoi  NSW Local water utility 19,186
SW10 Macquarie–Castlereagh  SS20 Macquarie–Castlereagh  NSW Local water utility 18,805
NSW High security – town water supply 40
NSW Sub-total  18,845
SW9 Lachlan SS16 Lachlan NSW Local water utility 15,545
SW8 Murrumbidgee NSW SS15 Murrumbidgee NSW NSW Local water utility 22,956
High security – town water supply 19,769
Sub-total  42,725
SW7 NSW Murray and Lower Darling SS18 Lower Darling NSW Local water utility 10,135
SS14 NSW Murray NSW Local water utility 33,497
High security – town water supply 3,170
Sub-total  36,667
Sub-total New South Wales 147,559
SW3 Northern Victoria SS4 Ovens Vic. Urban–regulated 7,832
SS5 Broken Vic. Urban–regulated 2,263
SS6 Goulburn Vic. Urban–regulated 35,895
SS7 Campaspe Vic. Urban–regulated 50,824
SS8 Loddon Vic. Urban–regulated 2,693
SW2 Vic. Murray SS2 Vic. Murray Vic. Urban–regulated 51,784
Wimmera–Mallee SS9 Wimmera–Mallee Vic. Urban–regulated 47,310
Sub-total Victoria 198,601
SW6 Eastern Mount Lofty Ranges SS13 Eastern Mount Lofty Ranges SA Urban
SW5 SA Murray SS11 SA Murray SA Class 2 – Other urban (country town) water supply 50,000
Class 6 – Metro-Adelaide water supply scheme 130,000
Combined classes urban  
Sub-total  180,000
SS10 SA Non-prescribed areas SA Urban
SW6 Eastern Mount Lofty Ranges SS12 Marne Saunders SA Urban
Sub-total South Australia 180,000
ACT SS1 ACT ACT Urban–regulated  70,000
Total for the region 596,160

– = no data available


Allocation reconciliation

The following table reconciles carry-over, allocation announcements, allocation diversion, allocation trade and allocation forfeiture for the jurisdictions within the MDB region for the 2011–12 year. All allocation related non-urban and urban line items have been considered in the reconciliation.

Reconciliation of volumes for the allocation related line items for the 2011–12 year

Jurisdiction

A = Line items 5.1 and 5.2 opening volume (allocation carry-over, ML)

B = Line items 21.1 and 21.2 (allocation announcements, ML)

C = Line items 17.11 and 17.12 (allocation diversion, ML)

D = Line items 13.1 and 13.2 (forfeiture, ML)

E = Line item 37.1 (temporary water trade inward, ML)

F = Line item 37.1 (temporary water trade outward, ML)

G = Line items 5.1 and 5.2 closing volume (allocation carry-over, ML)

A+B+E-C-D-F-G (ML)

Queensland

14,667

219,551

164,760

80,358

81,858

55,746

15,212

0

New South Wales

3,901,622

5,718,371

3,876,430

1,310,530

2,158,729

2,230,966

4,360,796

0

Victoria

2,864,073

2,762,779

2,404,884

366,418

1,141,030

1,372,711

2,623,870

0

South Australia

0

822,980

424,531

676,254

722,737

444,932

0

0

Australian Capitol Territory

0

70,000

41,790

28,210

0

0

0

0

All

6,780,362

9,593,682

6,912,395

2,461,770

4,104,354

4,104,354

6,999,878

0


The table shows allocations for all the jurisdictions were reconciled with no unaccounted volumes when allocation–related both non-urban and urban line items had been considered and allocation trades had been taken into account.

When only urban line items were considered, it was not possible to consider allocation trade in the reconciliation process because:

  • allocation trade has not yet been included as input variable in the current accounting process
  • details of allocation trade between non-urban and urban entitlement l classes were not available.

Reconciliation of urban line items (5.2, 13.2, 17.12 and 21.2) excluding allocation trades shows unaccounted volume of 14,140 ML. This unaccounted volume has been due to exclusion of allocation trade in the reconciliation.  Reconciliation of urban line items (5.1, 13.1, 17.11 and 21.1) has resulted in the same unaccounted volume. Therefore, allocation announcements (line items 21.1 and 21.2) have been revised as shown in the following table to accommodate change in water availability as a result of net allocation trade.

 

Accounting water availability resulting from net allocation trade in allocation announcements
Segment

Line item 21.1 

Line item 21.2

Both line items 21.1 and 21.2

Estimated from received data (ML)

Revised volume accommodating temporary water trade to reconcile allocation–related line items (ML)

Difference between estimated and revised volumes (ML)

Estimated from received data (ML)

Revised to reconcile allocation–related line items (ML)

Difference between estimated and revised volumes (ML)

Estimated from received data (ML)

Revised to reconcile allocation–related line items (ML)

Difference between estimated and revised volumes (ML)

Northern Basin

1,599,486

1,599,474

12

42,487

42,499

–12

1,641,973

1,641,973

0

Southern Basin

7,398,035

7,412,187

–14,152

553,673

539,521

14,152

7,951,709

7,951,709

0

Whole region

8,997,521

9,011,661

–14,140

596,160

582,020

14,140

9,593,682

9,593,682

0


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 distinguish between supplemented and unsupplemented entitlements. Both urban and non-urban supplemented entitlements are included within supplemented entitlement class. Supplemented urban and supplemented non-urban volumes on allocations, diversions and other attributes were received together and it was not possible for these to be separated out for two purposes. Therefore, surface water allocation announcements for both urban and non-urban supplemented entitlements are included in line item 21.1 Surface water allocation announcements.

New South Wales

New South Wales volumes reported in this line item contain the allocation announcements made under major and local water utility classes as well as the high security town water supply class. Water use for cultural, industrial, research, community and education activities have been categorised as non-urban.  Therefore, related allocation announcements are included in line item 21.1 Surface water allocation announcements.

In calculating allocation announcements, impacts of implementing new water sharing plans and abolishing existing plans have been taken into account. In addition, water availability related to allocation announcements took into account impact of reservoir spilling.

Victoria

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

Transfers to Melbourne via the North–South pipeline occur under a commercial arrangement and not under an entitlement. Therefore, no separate allocation volumes are available.

Australian Capital Territory

In the Australian Capital Territory, no formal allocation announcement is made to extract water from storages. The allocation announcement for the year is assumed to be equal to the total entitlement volume.

Quantification approach

Data source

(1) New South Wales Office of Water: water accounting section; and (2) water audit monitoring (WAM) data received from Australian Capital Territory (10 January 2013), Queensland (4 February 2013), South Australia (21 March 2013) and Victoria (31 January 2012). WAM data are stored in the Murray–Darling Basin Authority HYDRO database.

 

Provided by

Bureau of Meteorology (the Bureau).

Method

  • Allocation announcements are usually the entitlements on issue multiplied by the percentage allocation announced.
  • Allocation announcement is as calculated by the States and Australian Capital Territory.
  • WAM–supplied data are either measured, modelled or estimated.
  • The data supplied by New South Wales Office are prepared on a water balance approach. It implies that the movement of values during the year will balance the opening and closing balances. The forfeitures and adjustments have been checked to ensure that the closing balance reconciles.

 

Assumptions, limitations, caveats and approximations

Uncertainty estimates reported by New South Wales  Office of Water include possible errors 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

Uncertainty of allocation announcements may in part be due to existing entitlements being converted into a different class, new entitlements issued, or entitlements cancelled following commissioning of a water saving infrastructure project.

The table below shows the WAM uncertainty percentages and the measurement method applied that relates to the reported percentage. 

 

WAM uncertainty percentages
Percentage (%)

Accuracy description

5

Metered diversions

10

Estimate based on user meter readings

20

Detailed estimate based on regional surveys

40

Estimate based on user returns

 

The following table below outlines the WAM uncertainty percentage for each entitlement class for each jurisdiction.

 

Uncertainty percentages from jurisdictions
State Entitlement class  Uncertainty (%)
Qld Condamine Balonne 5
Qld Border Rivers 5
Qld Moonie System

n/a

Qld Nebine

n/a

Qld Warrego 5
Qld Paroo

n/a

NSW Combined NSW regulated data reliability 10
Vic. Broken 5–10
Vic. Goulburn 5
Vic. Campaspe 5
Vic. Loddon 5
Vic. Ovens 5
Vic. Murray 5–10
Vic. Wimmera–Mallee 5
SA Class 2 and Class 6 5

Comparative year

This line item corresponds to line item 21.2 'Surface water allocation announcements – urban system' reported in the 2011 Account. Availability of updated information resulted in the restatement of the 2010–11 year volume. 

In the 2011 Account, 163,300 ML was included in the line item for entitlement classes 2 and 6 in the South Australian Murray SDL area for the 2010–11 year. The volume was revised as 181,000 ML in the 2012 Account after receiving updated information. The respective volumes associated with the change are detailed in the following table.


 

Restatement of comparative year information made for the line item 21.1 Surface water allocation announcements–urban water system
2011 Account line item Segment 2012 Account volume for the 2010–11 year (ML) 2011 Account volume for the 2010–11 year (ML) Difference due to updated information (ML)
21.2 Surface water allocation announcements –urban water system Northern Basin 42,150 42,150 0
Southern Basin 514,394 496,694 17,700
Whole region 556,544 538,844 17,700