South East Queensland
13.1 Adjustment and forfeiture of surface water allocation

Supporting Information

a. Overall

The following table details the calculation of the adjustment and forfeiture of surface water allocation, where the allocation is not held by urban utilities.

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

5.1 Surface water allocation remaining (as at 1 July 2010)

11,676 0 0 11,676
add

21.1 Surface water allocation announcements

58,799 14,500 5 73,304
less

17.11 Surface water allocation diversion

4,012 1,888 5 5,905
less

5.1 Surface water allocation remaining (as at 30 June 2011)

12,234 0 0 12,234
equals 13.1 Adjustment and forfeiture of surface water allocation 54,229 12,612 0 66,841

Lower Lockyer Water Supply Scheme (WSS) water year is from 1 April to 31 March. All unused Lower Lockyer WSS allocations at 30 June 2011 were not regarded as forfeiture but rather as allocation remaining at the end of the National Water Account 2010–11 year (1 July 2010 to 30 June 2011). The volume reported represents the unused water allocation that remains available for use until 31 March 2012. Further information can be found in line item 5.1 Surface water allocation remaining.

This line item includes forfeiture, and adjustments on allocations. In some WSSs, allocation announcements were made for distribution loss entitlements (Central Lockyer WSS, Lower Lockyer WSS and Warrill Valley WSS). 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.

b. Non-urban surface water allocation remaining – reconciliation

The following table shows the  non-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 surface water allocation.

Non-urban surface water allocation reconciliation table
Water resource plan (WRP) area Water supply scheme (WSS)

Line item 5.1

Line item 21.1

Line item 17.11

Line item 13.1

Line item 5.1

Opening balance
(ML)
Announcement (ML) Allocation diversion
(ML)
Adjustment and forfeiture (ML) Closing balance (ML)
Gold Coast Nerang 0 5 5 0 0
Total Gold Coast WRP area 0 5 5 0 0
Logan Basin Logan River 0 14,500 1,888 12,612 0
Total Logan Basin WRP area 0 14,500 1,888 12,612 0
Moreton Central Brisbane River and Stanley River 0 7,316 NA 7,316 0
Central Lockyer 0 7,201 433 6,768 0
Cressbrook Creek 0 0 0 0 0
Lower Lockyer Valley 11,676 12,778 916 11,304 12,234
Pine Valleys 0 0 0 0 0
Warrill Valley 0 31,504 2,663 28,841 0
Total Moreton WRP area 11,676 58,799 4,012 54,229 12,234
Total SEQ region 11,676 73,304 5,905 66,841 12,234


Quantification Approach

Data Source

Queensland Department of Environment and Resource Management (DERM), resource operation plans (ROPs) and announced allocations WSS operators and licence holders: Seqwater and Toowoomba Regional Council DERM ROP and interim resource operation licence (IROL) DERM, Water Entitlement Register Database and Water Management System.

Provided by

DERM and Bureau of Meteorology.

Method

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

Calculation method for adjustment and forfeiture of surface water allocation

Calculation

Line item

 

5.1 Surface water allocation remaining (as at 1 June 2010)

add

21.1 Surface water allocation announcements

less

17.11 Surface water allocation diversion

less

5.1 Surface water allocation remaining (as at 30 June 2011)

equals

13.1 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 26.1.9.7 Adjustment and forfeiture of allocation on regulated flows – other lumped holder reported in the 2010 Account. In the 2010 Account this included a component for Cressbrook Creek WSS adjustment and forfeiture. In the 2011 Account Cressbrook Creek has been transferred to line item 13.2 Adjustment and forfeiture of surface water allocations – urban water system 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 13.1 Adjustment and forfeiture of surface water allocations
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
13.1 Adjustment and forfeiture of surface water allocation 26.1.9.7 Adjustment and forfeiture of allocation on regulated flows – other lumped holder 64,682 0 –12,199 52,483 Impact on adjustment of line item 21.1 Surface water allocation announcements