South East Queensland
19.17 Decrease of urban claim on surface water

Supporting Information

a. Overall

This line item represents the adjustment and forfeiture of supplemented surface water allocations held by urban utilities and the SEQ Water Grid Manager. The following table details the calculation of the adjustment and forfeiture.

Volume of adjustment and forfeiture of surface water allocations - urban water system
Calculation Line item Gold Coast Water Resource Plan (WRP) area
(ML)
Logan Basin WRP area
(ML)
Moreton WRP area
(ML)
Total SEQ region
(ML)
 

3.7 / 5.2 (remaining as at 1 July 2010)

0 0 0 0
add

11.18 / 21.2 Surface water allocation announcements – urban water system

83,995 8,910 349,921 442,826
less

11.12 / 17.12 (diversion)

55,313 1,067 140,948 197,328
less

3.7 / 5.2 (remaining as at 30 June 2011)

0 0 0 0
equals 13.2 / 19.17 Adjustment and forfeiture of surface water allocation – urban water system 28,682 7,843 208,973 245,498

This line item includes forfeiture, and adjustments on allocations. In some water supply schemes (WSSs), allocation announcements were made for distribution loss entitlements. These allocations cover conveyance losses from delivering water for other allocations. All distribution loss allocation usage has been included as adjustments in this line item as use is within stream and can not be considered a diversion.

This line item includes an adjustment term of 5,706 ML to account for the transfer of water to Toowoomba. This transfer was undertaken by Toowoomba Regional Council, the Cressbrook Creek WSS operator and resource operation licence (ROL) holder. This transfer is also shown in line item 17.21 Other surface water decrease.

b. Urban surface water allocation remaining – reconciliation

The following table shows the urban surface water allocation reconciliation. Due to the very wet year, demand was lower than in previous years and combined with the 100% allocation announcements, this has resulted in a higher forfeiture of urban surface water allocation (around 58%).

Urban surface water entitlements have a component included within them to allow for some future population growth. A component of the forfeiture may be attributed to this reason.

Urban surface water allocation reconciliation table
Water resource plan (WRP) area Water supply scheme (WSS)

Line item 5.2

Line item 21.2

Line item 17.12

Line item 13.2

Line item 5.2

Opening balance
(ML)
Announcement (ML) Allocation diversion
(ML)
Adjustment and forfeiture (ML) Closing balance (ML)
Gold Coast Nerang 0 83,995 55,313 28,682 0
Total Gold Coast WRP area 0 83,995 55,313 28,682 0
Logan Basin Logan River 0 8,910 1,067 7,843 0
Total Logan Basin WRP area 0 8,910 1,067 7,843 0
Moreton Central Brisbane River and Stanley River 0 278,725 115,752 162,973 0
Central Lockyer 0 0 0 0 0
Cressbrook Creek 0 10,000 208 9,792 0
Lower Lockyer Valley 0 0 0 0 0
Pine Valleys 0 59,000 24,571 34,429 0
Warrill Valley 0 2,196 417 1,779 0
Total Moreton WRP area 0 349,921 140,948 208,973 0
Total SEQ region 0 442,826 197,328 245,498 0

c. Urban entitlements

For the purpose of the 2011 Account, urban claim on surface water only includes the SEQ Water Grid Manager and Toowoomba Regional Council entitlement allocations, as they have been identified as the urban holders of entitlements in the resource operation plans (ROPs).

Other organisations may hold supplemented entitlements for some form of urban use, but, as urban use is not identified on entitlements, these could not readily be identified. For this reason, a small number of entitlements that may fall into this category are included in line item 21.1 Surface water allocation announcements.

In Queensland, entitlements and allocations do not have intended use as an attribute, and all metered abstractions do not have entitlement priority or use as attributes. Urban holders of entitlements were individually determined by obtaining all entitlement volumes from the Gold Coast, Logan Basin and Moreton ROPs schedule of water allocations listed for the SEQ Water Grid Manager and Toowoomba Regional Council.

Quantification Approach

Data Source

Queensland Department of Environment and Resource Management (DERM), resource operation plans (ROPs) and announced allocations. WSS operators and resource operation licence (ROL) / Inteiim ROL holders. DERM, Water Entitlement Register Database and Water Management System

Provided by

Bureau of Meteorology and DERM.

Method

The adjustment and forfeiture of surface water allocation was derived using the calculation in the folowing table.

Calculation method for adjustment and forfeiture of surface water allocation

Calculation

Line item

 

5.2 Surface water allocation remaining – urban water system ( as at 1 June 2010)

add

21.2 Surface water allocation announcements – urban water system

less

17.12 Surface water allocation diversion – urban water system

less

5.2 Surface water allocation remaining – urban water system ( as at 30 June 2011)

equals

13.2 Adjustment and forfeiture of surface water allocation (as at 30 June 2011)

Please refer to the specific line item components used in the calculation for the individual assumptions.



Assumptions, Limitations, Caveats and Approximations

Please refer to the specific line items used in the calculation of this line item for specific assumptions, approximations, caveats/limitations.

Uncertainty Information

There was no uncertainty associated with this value.

Comparative year

This line item corresponds to line item 26.1.2.4 Adjustment and forfeiture of allocation on regulated flows – high security, urban holder reported in the 2010 Account. In the 2010 Account this did not include a component for Cressbrook Creek WSS adjustment and forfeiture. In the 2011 Account Cressbrook Creek has been included in this line item as Cressbrook Creek is used to provide the town of Toowoomba with urban water.

The following table compares the value at 30 June 2010 reported in the 2011 Account with the corresponding value reported in the 2010 Account.

Comparative year information – line item 13.2 Adjustment and forfeiture of surface water allocation  – urban water system
2011 Account line item 2010 Account line item Volume reported in the 2010 Account
(ML)
Prior period error correction
(ML)
Volume difference due to scope change
(ML)
Restated volume reported in the 2011 Account
(ML)
Additional information
13.2 Adjustment and forfeiture of surface water allocation – urban water system 26.1.2.4 Adjustment and forfeiture of allocation on regulated flows – high security, urban holder
247,203 0 12,196 259,399 Impact of relocating Cressbrook Creek entitlements from 'Other' to 'Urban'