South East Queensland
17.12 Entitled diversion of allocated surface water to urban water system

Supporting information

a. Overall

The volumetric value for the line item at the end of the 2011–12 year was 212,352 ML.

This line item consists of diversions from surface water based on supplemented entitlements held by urban utilities and Department of Energy and Water Supply (DEWS). These diversions may be to water treatment plants (WTPs) that supply the South East Queensland water grid or off-grid WTPs.

 

A breakdown of diversions by water supply scheme (WSS) can be seen in the table below .

Allocation diversion of surface water to urban water system by water supply scheme
Water resource plan (WRP) area

Water supply scheme (WSS)

Volume 

(ML)

Gold Coast Nerang

62,763

Total Gold Coast WRP area

62,763

Logan Basin Logan River

1,456

Total Logan Basin WRP area

1,456

Moreton Central Brisbane River and Stanley River

110,815

Central Lockyer


Cressbrook Creek


Lower Lockyer Valley


Pine Valleys

36,894

Warrill Valley

424

Total Moreton WRP area

148,133

Total SEQ region

212,352

            –  = data not available

Notes:

  • There wouldn't be any flow from Toowoomba regional council to SEQ region as the pipeline is designed to pump the other direction, i.e. from Wivenhoe, within SEQ region, to Toowoomba to supplement their storages during times of need.

 

b. Urban surface water allocation remaining – reconciliation

The following table shows the urban surface water allocation reconciliation. Demand was lower in 2012 than in the previous year and combined with the 100% allocation announcements, this has resulted in higher forfeiture of urban surface water allocation (around 52%) than that reported for the 2011 Account.

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

Announcement (ML)

Allocation diversion

Adjustment and forfeiture (ML)

Closing balance (ML)

(ML)

(ML)
Gold Coast Nerang

0

83,995

62,763

21,232

0

Total Gold Coast WRP area

0

83,995

62,763

21,232

0

Logan Basin Logan River

0

8,910

1,456

7,454

0

Total Logan Basin WRP area

0

8,910

1,456

7,454

0

Moreton Central Brisbane River and Stanley River

0

278,725

110,815

167,910

0

Central Lockyer

0

0

0

0

0

Cressbrook Creek

0

10,000

0

10,000

0

Lower Lockyer Valley

0

0

0

0

0

Pine Valleys

0

59,000

36,894

22,106

0

Warrill Valley

0

2,196

424

1,772

0

Total Moreton WRP area

0

349,921

148,133

201,788

0

Total SEQ region

0

442,826

212,352

230,474

0

There is no carryover in the SEQ region and urban surface water allocation remaining (line item 5.2) will be always zero.

c. Urban entitlements

For the purpose of the 2012 Account, the 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 operations plans (ROPs).

Other organisations may hold supplemented entitlements for some form of urban use. 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 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

Seqwater WaterHub database WTP outflow data.

Seqwater supplemented / unsupplemented WTP list.

Provided by

Bureau of Meteorology.

Method

Metered diversion to WTP or output from WTP data was obtained from Department of Energy and Water Supply (DEWS). Wherever possible, available diversion data was used in preference to WTP output data. WTP were selected where the source was surface water and the entitlement was unsupplemented. WTPs were then separated in to the water resource plan (WRP) areas and on-grid (form part of the SEQ water grid) and off-grid.

Assumptions, limitations, caveats and approximations

DEWS has accepted metered data provided by WSS operators in good faith. The volume calculated excludes distribution loss, which was included in line item 13.2 Adjustment and forfeiture of surface water allocation – urban water system.

Uncertainty information

Derived from measured data. DNRM reliability and accuracy rating is about +/– 20%.

Comparative year

This line item corresponds to line item '11.12 Allocation diversion of surface water to urban water system' reported in the 2011 Account.