The information presented in the Adelaide region report is based on agreements between the South Australian Department for Water, SA Water and the Bureau of Meteorology (the Bureau).
The report has been prepared using an accrual basis of water accounting, with the exception of the physical water flow information. The water attribute being quantified is volume and the unit of account is megalitres (ML).
Only water that is held or managed by the state licensing authority or the urban utilities and part of the entitlement system is defined as a water asset. Provided its volume can be quantified with representational faithfulness, the volume of the water asset or water liability is recognised in the Statement of Water Assets and Water Liabilities. Where a water asset or water liability does not meet the recognition criteria, it is reported in the Statement of Water Assets and Water Liabilities with a dash (–). Water held in storages that has already been abstracted from the entitlement system is deemed not to be part of the water report entity (no matter their size or connection to the system). This is because the attendant water right has already been exercised.
While water within 1.2 Unregulated channel and 1.3 Regulated channel are vital water assets for the conveyance of water within the water report entity, it cannot be quantified with representational faithfulness.
2.3 Aquifers—other lumped have been quantified only for groundwater assets that are in a groundwater prescribed area. If a groundwater resource is not in a groundwater prescribed area, the resource is not able to be quantified with representational faithfulness. The quantification in the prescribed areas is 100% of the allowable entitlement portion from the aquifers during the reporting period. The estimated non-extractable portion is classified as a contingent water asset as this water is not legally extractable and as such has only been reported in the Notes.
The increases and decreases to the water assets and water liabilities reported consist only of changes that can be quantified with representational faithfulness. Where a change to a water asset or water liability does not meet the recognition criteria, it is reported in the Statement of Changes in Water Assets and Water Liabilities and the Statement of Physical Water Flows with a dash (-). These increases and decreases form part of 30 Unaccounted-for difference and are explained in the Notes.
Precipitation and evaporation are recognised only in relation to the storage surfaces (13.1 Precipitation on connected surface water & 14.1 Evaporation from connected surface water). It does not represent all precipitation, evaporation and evapotranspiration within the physical region of the water report entity (notably, these processes occurring from the landscape are not captured).
That portion of runoff that flows into the storages is quantified and recognised. This runoff includes precipitation captured in the catchment less evaporation and seepage and recorded as 13.4.1 Runoff to connected surface water.
The definition of regulated or unregulated for the purpose of the National Water Account 2010 may be different to the meaning applied by the jurisdiction.
Several community waste management systems (CWMS) in the Adelaide region produce recycled water for irrigation and industrial use. This volume cannot be quantified with representational faithfulness and so has not been recognised in the water accounting statements.
Groundwater resources in the Western Mount Lofty Ranges Prescribed Water Resources Area and the Central Adelaide Prescribed Wells Area are prescribed but managed under a notice of prohibition. A notice of prohibition controls water-use development until water-access entitlements are granted and while a water allocation plan is under development. The relevant water-allocation plan and groundwater allocations had not been finalised during 2009–10; therefore, the volume cannot be quantified with representational faithfulness.
The volume of groundwater resources in prescribed areas servicing activities covered by a gazetted notice of authorisation under Section 128 of the NRM Act (2004), or any other extractions not requiring an allocation, is not recognised as a water asset. These activities include:
The volume of groundwater servicing such activities is likely to be small but cannot be quantified with representational faithfulness.
The Adelaide Region contains some groundwater resources that are not declared as prescribed. The volume of these groundwater resources cannot be quantified with representational faithfulness due to the lack of data and suitable quantification methods. Therefore, these groundwater resources have not been recognised as a water asset in the water-accounting statements.
Most unregulated rivers in the Adelaide Region are ephemeral. Streamflow typically occurs in winter and spring months. Therefore, some water is expected to be in river channels at the start and end of the reporting period. This volume cannot be quantified with representational faithfulness due to the lack of data and suitable quantification methods. Consequently, water in river channels has not been recognised as a water asset in the water-accounting statements.
The section of the rivers in the Adelaide Region classified as regulated is restricted to sections of river between the SA Waters reservoirs and water treatment plants. This volume cannot be quantified with representational faithfulness due to the lack of data and a suitable quantification method.
Individual irrigators in the Adelaide Region can hold other River Murray licences, such as River Murray Class 3a (formerly irrigation) licences. It was not possible to determine which River Murray Class 3a licence holders were located within the Adelaide Region. Consequently the portion of River Murray Class 3a licence relevant to the Adelaide Region was not recognised as a nonphysical water asset. The total volume for the River Murray Class 3a (irrigation) licence is 544 GL/year, but the volume relevant to the Adelaide Region is likely to be relatively small.
As at 30 Jun 2010, there were no water liabilities for the Adelaide Region that failed the recognition criteria.