6.1 Groundwater allocation remaining

Supporting information

The groundwater allocation remaining corresponds to the unused volume of allocated groundwater that is carried forward to the following year, called a 'rollover allocation', and recharged groundwater credits carried forward to the following year. Recharged groundwater credits refer to water actively injected to groundwater (managed aquifer recharge), stored for a period of time (recharge period) and for which a portion of the stored water is subsequently made available for reuse (recharged water credit).

At 30 June 2013, the volume of groundwater carried over for groundwater licences and recharged groundwater credits was 3,941 ML and is itemised by prescribed area in the following table.

Groundwater allocation remaining at 30 June 2013 in the Adelaide region
Category Management area Volume at 30 June 2013 (ML)
Volume at 1 July 2012 (ML)
Groundwater allocation carry-over  Barossa Prescribed Water Resources Area (PWRA) 678 466
McLaren Vale Prescribed Wells Area (PWA) 1,602 1,673
Northern Adelaide Plains PWA1 0 0
Dry Creek PWA2 0 0
Subtotal 2,280 2,139
Recharged water credits carry-over Barossa PWRA3 n/a n/a
McLaren Vale PWA4 0 1
Northern Adelaide Plains PWA 1,661 4,501
Dry Creek PWA5 n/a n/a
Subtotal 1,661 4,502
Total 3,941 6,641

1, 2 Carry-over of groundwater allocations is not permitted for this groundwater resource.

3, 5 There is no managed aquifer recharge scheme for this prescribed groundwater resource.

4 A very small volume (38 KL) was reported for the McLaren Vale PWA; however this rounds to zero.

The groundwater allocation remaining at 30 June 2013 was calculated as shown in the following table.

Volume of groundwater allocation remaining at the start and end of the 2012–13 year
Account Volume (ML)
Opening balance (at 1 July 2012)
22.1 Groundwater allocation announcements 48,339
14.1 Adjustment and forfeiture of groundwater allocation (23,512)
18.11 Entitled extraction of allocated groundwater to users (27,527)
Closing balance (at 30 June 2013)

Extractions from groundwater resources in the Adelaide region, not listed in the previous table, were are managed by authorisations under sections 128,132 and 164N of South Australia's Natural Resources Management Act 2004 during the 2012–13 year. In these instances, carry-over arrangements do not exist.

Quantification approach

Data source

Water Information and Licence Management Administration (WILMA) database and database detailing managed aquifer recharge credit calculations.

Provided by

South Australian Department of Environment, Water and Natural Resources (DEWNR).


Groundwater allocation

Carry-over of groundwater allocations was extracted from the WILMA licensing database.

Recharged water credits

The DEWNR database detailing managed aquifer recharge credit calculations was used to differentiate new recharged water credits from previously applied but not used or not expired recharged water credits carried over at the end of the 2012–13 year.

Assumptions, limitations, caveats and approximations

In some situations the operating rules applicable to managed aquifer recharge schemes were created under Environment Protection Authority guidance and may differ from the content of the relevant water allocation plan.

Uncertainty information

The uncertainty estimate was not quantified.