South East Queensland
11.5 Delivery of water from outside region to urban water system

Supporting Information

This line item consists of water transferred into the urban water supply system (including potable and non-potable water), wastewater collection system and recycled water supply system from outside the region.

There were no wastewater, recycled water or non-potable water transfers into the South East Queensland (SEQ) region, only potable water transfers.

The following table shows the potable water imports to the SEQ region during the 2010–11 year.

Potable water imports into the South East Queensland region
Import Volume
(ML)
Sunshine Coast via Northern Pipeline Interconnector        9,688
Sunshine Coast via local reticulation system        6,255
North Stradbroke Island        8,693
Total SEQ region       24,636

Quantification Approach

a. Quantification approach: Northern Pipeline Interconnector

Data Source

SEQ Water Grid Manager WaterHub Database metered data for the Northern Pipeline Interconnector (NPI) (meter M-096-BT and meter M-097-BT) provided by LinkWater.

Provided by

SEQ Water Grid Manager.

Method

Import from the Sunshine Coast via the NPI was measured by the NPI master meter at:

  • stage 1 – main to NPI at Old Gympie Road (meter M-096-BT)
  • stage 2 – main to NPI at Nobels Road (meter M-097-BT).

The meter readings, recorded by LinkWater, are daily time steps summed to provide an annual total.

Assumptions, Limitations, Caveats and Approximations

None.

Uncertainty Information

Derived from metered data. The uncertainty estimate was not quantified.

b. Quantification approach: Sunshine Coast via local reticulation system

Data Source

Queensland Water Commission (QWC) WaterHub database, suburb consumption data.

Provided by

Bureau of Meteorology.

Method

Import from the Sunshine Coast via the local reticulation system was calculated from the consumption data obtained from the QWC WaterHub database multiplied by a leakage percentage. Landers Shute Water Treatment Plant (WTP) supplies southerly flow to the Narangba–Morayfield area and North Pine (postcodes 4551, 4550, 4517, 4518 and 4519).

Imported potable water consumption of 5,635 ML was obtained from the QWC WaterHub database for these areas for the 2010–11 year.

The leakage percentage for the Sunshine Coast Regional Council was determined using the total consumption of 30,654 ML and a leakage estimate of 3,384 ML, giving a leakage rate of 11%.

Assumptions, Limitations, Caveats and Approximations

Area-based weighting of consumption per postcode assumes that the consumption occurs equally throughout each postcode.

It was assumed that the average leakage rate throughout the Sunshine Coast Regional Council area occurred within these postcodes.

More or less leakage may have occurred due to various factors, including pipe age, pipe material, pressure and local geology.

Uncertainty Information

Derived from metered data. The uncertainty estimate was not quantified.

c. Quantification approach: import from North Stradbroke Island

Data Source

QWC WaterHub database, suburb consumption data.

Provided by

Bureau of Meteorology.

Method

Import from North Stradbroke Island was equal to the production from the North Stradbroke Island WTP less the consumption from postcode 4184 (islands of Macleay, Russell, Karragarra, Lamb and Coochiemudlo).

The outflow through the North Stradbroke Island outlet meter M-013-BS was obtained from the SEQ Water Grid Manager WaterHub database.

The consumption from postcode 4184 was extracted from the QWC WaterHub database.

Potable water import from North Stradbroke Island
Description Calculation Volume
(ML)
North Stradbroke Island Water Treatment Plant production        9,130
Consumption of postcode 4184 less         437
  equals      8,693

Assumptions, Limitations, Caveats and Approximations

Based on metered data in WaterHub provided by QWC. The North Stradbroke Island production figure was only the production of the North Stradbroke Island WTP. As this production was only based on one meter, this can not be broken down into the volume transferred to the SEQ region and the volume used locally to service communities on North Stradbroke Island. A slight overestimate of the volume transferred into the SEQ region will have occurred, although this volume is expected to be minor.

Uncertainty Information

Derived from metered data. The uncertainty estimate was not quantified.

Comparative year

This line item corresponds to line item 19.5.6 Other lumped delivery of water transferred into water distribution system reported in the 2010 Account, which had a value of 25,084 ML.