2.5 Other groundwater assets
The volumetric value for the line item for the 2010–11 year was 1,327,718 ML for the Murray–Darling Basin (MDB) region. The line item represents sustainable diversion limits that include long term estimates of volumes for extraction, basic land holder rights or unlicensed stock and domestic rights (where these are not included in the long term extraction estimates in the water resource plan) and for New South Wales the volume of supplementary access licence that was available for use in the 2010–11 year.
Following two tables provide a summary and a breakdown of volumetric details of the line item. More details about the groundwater asset volumes and other data within the region are available in the Groundwater note.
|Groundwater resource plan area||State||Groundwater Asset Volume1 (ML)|
|GW23||Warrego – Paroo – Nebine||Qld||–|
|GW20||Qld Border Rivers||Qld||–|
|GW19||NSW Border Rivers Alluvium||NSW||–|
|GW18||New England Fractured Rock and Northern Basalts||NSW||–|
|GW17||Eastern Porous Rock||NSW||–|
|GW14||NSW Alluvium above GAB||NSW||–|
|GW13||NSW Sediments above GAB||NSW||–|
|GW11||Lachlan and South Western Fractured Rock||NSW||–|
|Sub-total Northern Basin||440,923|
|GW11||Lachlan and South Western Fractured Rock||NSW||–|
|GW6||Western Porous Rock||NSW||–|
|GW5||Eastern Mount Lofty Ranges||SA||11,156|
|Sub-total Southern Basin||886,795|
|Total for the region||1,327,718|
– = Data not available
1 Water table, underlying or combined aquifers
|Groundwater resource plan area||
Groundwater sustainable diversion limit area
Groundwater asset volume (ML)
|Gwydir Alluvium||GS29||Lower Gwydir Alluvium||Water Sharing Plan for the Lower Gwydir Groundwater Source 2003||NSW||43,139|
|Namoi Alluvium||GS34||Lower Namoi Alluvium||Water Sharing Plan for Upper and Lower Namoi Groundwater Sources 2003||NSW||99,741|
|GS45||Peel Valley Alluvium||Water Sharing Plan for Peel Valley Regulated, Unregulated, Alluvium and Fractured Rock||NSW||80,562|
|GS51||Upper Namoi Alluvium||Water Sharing Plan for Upper and Lower Namoi Groundwater Sources 2003||NSW||145,258|
|Macquarie–Castlereagh Alluvium||GS31||Lower Macquarie Alluvium||Water Sharing Plan for Lower Macquarie Groundwater Sources 2003||NSW||72,223|
|Lachlan Alluvium||GS30||Lower Lachlan Alluvium||Water Sharing Plan for Lower Lachlan Groundwater Source 2003||NSW||126,876|
|Murrumbidgee Alluvium||GS33||Lower Murrumbidgee Alluvium (deep: Calivil Formation and Renmark Group)||Water Sharing Plan for Lower Murrumbidgee Groundwater Source 2003||NSW||291,598|
|GS33||Lower Murrumbidgee Alluvium (shallow: Shepparton Formation)||Water Sharing Plan for Lower Murrumbidgee Groundwater Source 2003||NSW||13,000|
|Murray Alluvium||GS32||Lower Murray Alluvium (deep: Renmark Group and Calivil Formation)||Water Sharing Plan for Lower Murray Groundwater Source||NSW||133,137|
|Sub-total New South Wales||1,005,534|
|Goulburn–Murray||GS08||Goulburn–Murray||Alexandra Groundwater Management Area||Vic||1,937|
|GS08||Goulburn–Murray||Barnawatha Groundwater Management Area||Vic||2,100|
|GS08||Goulburn–Murray||Katunga Water Supply Protection Area||Vic||59,780|
|GS08||Goulburn–Murray||Kinglake Groundwater Management Area||Vic||2,015|
|GS08||Goulburn–Murray||Loddon Highlands Water Supply Protection Area||Vic||20,521|
|GS08||Goulburn–Murray||Lower Campaspe Valley Water Supply Protection Area||Vic||56,381|
|GS08||Goulburn–Murray||Lower Ovens Groundwater Management Area||Vic||25,200|
|GS08||Goulburn–Murray||Mid Goulburn Groundwater Management Area||Vic||14,900|
|GS08||Goulburn–Murray||Mid Loddon Groundwater Management Area||Vic||37,200|
|GS08||Goulburn–Murray||Mullindolingong Groundwater Management Area||Vic||6,980|
|GS08||Goulburn–Murray||Upper Ovens River Water Supply Protection Area||Vic||4,010|
|Wimmera–Mallee (groundwater)||GS09||Wimmera–Mallee||Goroke Groundwater Management Area||Vic||2,200|
|GS09||Wimmera–Mallee||Kaniva TCSA Groundwater Management Area||Vic||1,100|
|GS09||Wimmera–Mallee||Murrayville Water Supply Protection Area||Vic||10,883|
|GS09||Wimmera–Mallee||Nhill Groundwater Management Area||Vic||1,200|
|Eastern Mount Lofty Ranges||GS01||Angas Bremer (Quaternary Sediments and Murray Group Limestone)||Angas-Bremer Prescribed Wells Area||SA||6,500|
|GS04||Marne Saunders (Fractured Rock, Murray Group Limestone and Renmark Group)||Marne Saunders Prescribed Water Resources Area||SA||4,656|
|SA Murray||GS03||Mallee (Pliocene Sands, Murray Group Limestone and Renmark Group)||Noora Prescribed Wells area||SA||5,138|
|GS03||Mallee (Pliocene Sands, Murray Group Limestone and Renmark Group)||Mallee Prescribed Wells Area Water Allocation Plan 2000||SA||53,500|
|GS05||Peake – Roby – Sherlock (unconfined and confined)||Peake, Roby and Sherlock Prescribed Wells Area||SA||5,983|
|Sub-total South Australia||75,777|
Sustainable diversion limit (SDL) areas other than included in the above tables do exist and may be relevant to the line item, however, relevant information was not available for the 2011 Account. For example, SDL areas for which groundwater plans are not available (i.e. the annual extraction limit has not been set by a water resource plan) are not included for the line item.
No information on groundwater asset volumes was available for Queensland and the Australian Capital Territory areas within the MDB region.
More information on Basic rights within the MDB region is included in line item 18.7 Extraction: other statutory rights.
The extractable volume of groundwater has been estimated as the sum of the following attributes as stated in the relevant groundwater plan, if there was such plan in place during the 2010–11 year:
- long term estimates of volumes for extraction
- basic land holder rights or unlicensed stock and domestic rights (where these are not included in the long term extraction estimates in the water resource plan)
- for New South Wales the volume of supplementary access licence that was available for use in the 2010–11 year.
If a plan commenced after 30 June 2011, it was excluded from the account. Where a plan was abolished after 30 June 2010, the value of the plan in effect for the 2010–11 year was included in the 2011 Account.
Basic landowner rights are added to the long term annual extraction limits for those plans that do not include this extractable volume in the plan extraction limit to get an estimate of what is legally extractable from the aquifers. In addition, for New South Wales the volume of supplementary access licences for the 2010–11 year was included to better reflect the total volume of water that can be extracted from the aquifer for the 2010–11 year.
Assumptions, Limitations, Caveats and Approximations
The basic landowner rights were considered as those at the commencement of the groundwater plan.
The uncertainty estimate was not quantified.
This line item corresponds to line item 2.3 Aquifers – other lumped, reported in the 2010 Account. In the 2011 Account, the following changes were made that caused the 2009–10 year value to be restated:
- An error correction was made in the values reported in the 2010 Account.
- The scope of the line item was changed.
The changes and their respective values are detailed in the following table.
|2010 Account line items||
Volume at 30 June 2010 reported in the 2010 Account (ML)
Difference due to prior period error correction and scope change (ML)
Volume at 30 June 2010 reported in the 2011 Account (ML)
|Line item 2.3 Aquifers – other lumped||Northern Basin||318,264||50,477||368,741|
Scope change was due to the following reason:
- Upward flow volumes from the Great Artesian Basin in the Lower Namoi Alluvium was available for the 2010 Account (line item 15.1.3 Other lumped groundwater inflow from outside region) but not for the 2011 Account. Therefore, when calculating the restated value for the comparative year, the volume reported for the 2010 Account was reduced to reflect the scope change.
- NSW supplementary access licences were not included in the 2010 Account. While these volumes are set to decrease each year until they disappear completely, they represent a temporary arrangement, giving time for the licensees to adapt the activities to the long-term extractable limits. Because these supplementary access licences were available for extraction in the 2009–10 year they have been restated for the asset volume.
Prior period error correction was due to the following reason:
- For the 2010 Account, the volume of long term average annual extraction for Lower Macquarie groundwater sources in New South Wales was overstated by 5 ML.
- In Victoria, the Spring Hill Water Supply Protection Area (5,062 ML), Upper Loddon Water Supply Area (13,648 ML) and Southern Campaspe Plains Groundwater Management Area (8,850 ML) permissible consumptive volumes were not included in the 2010 Account. Orders were gazetted in July and August 2010 that revoked these areas; however, they were applicable as at 30 June 2010.