Adelaide
18.11 Entitled extraction of allocated groundwater to users

Supporting information

The volume reported (27,528 ML) represents the volume of groundwater extracted under water licences in the Adelaide region during the 2012–13 year. The table below details the groundwater extractions by management area and measurement type.

Licenced groundwater extractions in the Adelaide region during the 2012–13 year
Management area Item Volume (ML)
Barossa Prescribed Water Resources Area (PWRA) metered extractions1 3,381
non-metered—estimated stock and domestic extractions2 29
non-metered—estimated other extractions3 1,441
Subtotal 4,851
McLaren Vale Prescribed Wells Area (PWA) metered extractions 4,376
non-metered—estimated stock and domestic extractions4 8
non-metered—estimated recharged groundwater credits extraction5 6
non-metered—estimated extraction of groundwater allocation carry-over6 1,110
Subtotal 5,500
Northern Adelaide Plains PWA metered extractions 12,502
non-metered—estimated stock and domestic extractions7 174
non-metered—estimated recharged groundwater credits extraction8 4,501
Subtotal 17,177
Dry Creek PWA no data available
Subtotal
Total 27,528

1 This volume includes metered extractions of rollover groundwater allocations.

2, 4, 7 Assume 100% of groundwater allocated for stock and domestic purposes was extracted, reported at line item 22.1 Groundwater allocation announcements.

3 Refer to quantification approach for estimated other non-metered extractions in the Barossa PWRA

5, 8 Assume 100% of recharged groundwater credits allocated were extracted, reported at line item 22.1 Groundwater allocation announcements.

6 Assume 66.3% of rollover groundwater allocations at 1 July 2012 was extracted in the McLaren Vale PWA, reported at line item 6.1 Groundwater allocation remaining. Refer to quantification approach for percentage applied.

Quantification approach

Data source

South Australian Department of Environment, Water and Natural Resources (DEWNR): Water Information and Licence Management Administration System (WILMA) database; Bureau of Meteorology: calculations of non-metered groundwater extractions.

Provided by

DEWNR; Bureau of Meteorology.

Method

Metered extractions

Metered extraction data were obtained from the WILMA licensing database.

Non–metered extractions
Non-metered extractions for stock and domestic licences were estimated at 100% of the stock and domestic allocation for all management areas, reported at line item 22.1 Groundwater allocation announcements.

Non-metered extractions for recharged water were estimated at 100% extraction of the recharged water credits allocation for the McLaren Valen PWA and Northern Adelaide Plains PWA, reported at line item 22.1 Groundwater allocation announcements.

Non-metered other groundwater extractions in the Barossa PWRA were calculated by estimating the percentage of allocated groundwater extracted, then applying this percentage to the groundwater exceptions as reported in the WILMA database. This calculation is summarised in the following table.

Calculation of non-metered other groundwater extractions in the Barossa PWRA during the 2012–13 year
Calculation Item Volume (ML)
  metered diversions in the Barossa PWRA 3,381
add estimated stock and domestic extractions 29
Subtotal extractions 3,410
divided by 22.1 Groundwater allocation announcements (for the Barossa PWRA only) 7,828
equals percentage usage in the Barossa PWRA 43.56%
multiply groundwater exceptions in the Barossa PWRA 3,308
equals non-metered—estimated other extractions 1,441


Non-metered extraction of groundwater allocation carryover in the McLaren Vale PWA was calculated by estimating the percentage extraction of allocated groundwater, then applying this percentage to the groundwater allocation carryover reported at line item '6.1 Groundwater allocation remaining' at 1 July 2012.  This calculation is summarised in the following table.

Calculation of non-metered extractions of groundwater allocation carryover in the McLaren Vale PWA during the 2012–13 year
Calculation Item Volume (ML)
  metered diversions in the McLaren Vale PWA 4,376
add estimated stock and domestic extractions 8
add estimated recharged water credits extraction 6
Subtotal extractions 4,390
divided by 22.1 Groundwater allocation announcements (for the McLaren Vale PWA only) 6,617
equals percentage usage in the McLaren Vale PWA 66.34%
multiply groundwater allocation carry-over for McLaren Vale PWA at 1 July 2012 (reported at line item 6.1 Groundwater allocation remaining) 1,673
equals non-metered—estimated extraction of groundwater allocation carryover 1,110

Assumptions, limitations, caveats and approximations

The assumptions made to calculate non-metered extractions were validated by DEWNR. The calculation of non-metered diversions was made by the Bureau.

Uncertainty information

The uncertainty estimate was not quantified.