Adelaide
17.11 Entitled diversion of allocated surface water to users

Supporting information

The volume reported (1,010 ML) represents the volume of water diverted under surface water licences (watercourse) held in the Barossa Prescribed Water Resources Area (PWRA) during the 2012–13 year. Data were not available for the Little Para River Prescribed Watercourse (PWC). The volume reported includes metered and non-metered diversion data as shown in the following table.

Metered and non-metered surface water diversions in the Barossa PWRA during the 2012–13 year
Item Volume (ML)
metered diversions 888
estimated stock and domestic surface water diversions 1
estimated diversion of surface water carry-over allocations 121
Total 1,010


Quantification approach

Data source

South Australian Department of Environment Water and Natural Resources (DEWNR): Water Information and Licence Management Administration (WILMA) database; Bureau of Meteorology: calculations of non-metered surface water diversions.

Provided by

DEWNR; Bureau of Meteorology.

Method

Metered extractions

Metered extraction data were obtained from the WILMA licensing database.

Non–metered extractions
Non-metered diversions for stock and domestic licences were estimated at 100% of the stock and domestic allocation for the Barossa PWRA, reported at line item 21.1 Surface water allocation announcements.

Non-metered diversions for surface water carry-over allocations were calculated by estimating the percentage of allocated surface water diverted in the Barossa PWRA, then applying this percentage to the volume of surface water carry-over allocations at 1 July 2012, reported at line item '5.1 Surface water allocation remaining'. This calculation is summarised in the following table.

Calculation of diversion of surface water carryover allocations in the Barossa PWRA during the 2012–13 year
Calculation Item Volume (ML)
  metered diversions in the Barossa PWRA 888
add estimated stock and domestic diversions
 1
Subtotal usage 889
divided by 21.1 Surface water allocation announcements (for the Barossa PWRA only) 2,779
equals percentage of allocated surface water diverted in the Barossa PWRA 32%
multiply by surface water carry-over allocation for Barossa PWRA at 1 July 2012 (reported at line item 5.1 Surface water allocation remaining) 377
equals estimated diversion of surface water carry-over allocations for the Barossa PWRA 121

Assumptions, limitations, caveats and approximations

  • The assumptions made to calculate non-metered diversions were validated by DEWNR water-licensing staff members.
  • Metered diversion data were not available for the Little Para PWC.

Uncertainty information

The uncertainty estimate was not quantified.