17.7 Entitled diversion of non-allocated surface water to users
The volumetric value for the line item for the 2011–12 year was 1,614,049 ML. The line item represents entitled diversion of non-allocated surface water, except for to urban water systems, in the Murray–Darling Basin (MDB) region. Non-allocated surface water diversions are made under water access entitlements, for which no present commitment (water liability) to deliver water to users was recognised.
The following two tables provide a summary and breakdown information for the line item in the MDB region.
|Surface water resource plan (WRP) area||State/Terrotory||Volume (ML) for the 2010–11 year|
|SW16||Qld Border Rivers||Qld||123,395|
|SW15||NSW Border Rivers||NSW||85,186|
|SW12||NSW Intersecting Streams||NSW||3,309|
|Sub-total Northern Basin||1,090,894|
|SW7||NSW Murray and Lower Darling||NSW||289,529|
|SW6||Eastern Mount Lofty Ranges||SA||–|
|Sub-total Southern Basin||523,155|
|Total for the region||1,614,049|
|Surface water resource plan (WRP) area||
Sustainable diversion limit (SDL) area
Volume (ML) for the 2011–12 year
|SW16 Qld Border Rivers||SS24||Qld Border Rivers||Qld||Unsupplemented||123,395|
|SW15 NSW Border Rivers||SS23||NSW Border Rivers||NSW||Supplementary||62,186|
|SW11 Barwon–Darling Watercourse||SS19||Barwon–Darling Watercourse||NSW||Unregulated||98,944|
|SW12 NSW Intersecting Streams||SS17||NSW Intersecting Streams||Unregulated||3,309|
|SW8 Murrumbidgee NSW||SS15||Murrumbidgee NSW||NSW||Supplementary||139,785|
|SW7 NSW Murray and Lower Darling||SS18||Lower Darling||NSW||Supplementary||101,822|
|Sub-total New South Wales||1,061,233|
|SW2 Vic. Murray||SS3||Kiewa||Vic.||Unregulated||2,290|
|SW3 Northern Victoria||SS4||Ovens||Vic.||Unregulated||2,350|
|SW2 Vic. Murray||SS2||Vic. Murray||Vic.||Unregulated||15,132|
|SW1 ACT||SS1||ACT||ACT||Unregulated– multi-purpose||740|
|Sub-total Australian Capital Territory||740|
|Total for the region||1,614,049|
Further Information for Queensland
Queensland data includes unsupplemented irrigation water allocation with flow conditions, unsupplemented irrigation allocation without flow conditions and unsupplemented water licences diversions. The overland flow take estimation is shown under line item 17.5 Overbank flood spilling.
Further Information for New South Wales
New South Wales data in the previous table includes supplementary diversions in the regulated system and unregulated diversions in the unregulated systems. Although the line item name refers to non-allocated diversions, supplementary diversions are allocated by an available water determination following an announcement process as with the other allocated diversions.
The volume for unregulated entitlement class for Murrumbidgee NSW includes 338 ML uncontrolled water use in regulated supply area.
New South Wales data includes 4,183 ML of water diverted from the unregulated Fish River within the Macquarie–Castlereagh region to Delta Electricity and Lithgow City Council, (for use outside the MDB region) via the Fish River Water Supply Scheme under a commercial arrangement.
Further Information for Australian Capital Territory
In addition to the Australian Capital Territory volume stated in the above table, Murrumbidgee New South Wales volumes include Australian Capital Territory supplies for which Murrumbidgee New South Wales SDL area is the supply source.
Australian Capital Territory volume provided in this line item includes diversions of unregulated flows under multi-use licences for non-potable water within the Australian Capital Territory. It includes urban use for licensed abstraction within the urban area, and other use for licensed abstraction outside the urban area.
Bureau of Meteorology (the Bureau).
Australian Capital Territory SDL area: Individual licensees submit monthly meter readings to the Australian Capital Territory Environment Protection Authority on an annual basis. Where a licensee has not provided meter data, the EPA estimates usage based on historical usage data.
Other SDL areas: Volumes provided through WAM sources and NSW Office of Water's water accounting section were either measured, modelled or estimated.
Assumptions, limitations, caveats and approximations
Uncertainty reported by NSW Office of Water includes possible errors in the data handling processes.
Estimates of uncertainty of the diversions are indicative of the accuracy of bulk diversions only.
A single metered abstraction point may provide water to a range of users under various types of entitlements (e.g. stock and domestic class). When this happens, the jurisdiction may split the metered abstraction into several classes of entitlements or types of users, according to priority rules governing the entitlements. This split has an inherent uncertainty that is not considered here.
Information provided in this line item may have been based on Cap valleys in the HYDRO database which may not align perfectly with SDL areas.
ACT SDL area: More than 60% of meters are inspected each year to validate the readings supplied by licensees. Estimated uncertainty for meter accuracy is +/–5%. Uncertainty cannot be quantified for estimated usage where meters were not read.
Other SDL areas: The tables below show the WAM uncertainty definitions and the measurement method applied that relates to the reported uncertainty percentage, and the WAM uncertainty percentage for each entitlement class for each State.
|10||Estimate based on user meter readings|
|20||Detailed estimate based on regional surveys|
|40||Estimate based on user returns|
|Jurisdiction||All entitlement classes in following SDL areas||WAM uncertainty (%)|
|NSW||Lower Darling||The uncertainty estimate was not quantified|
|Vic.||Murray||The uncertainty estimate was not quantified|
This line item corresponds to line item 17.7 Non-allocated diversions to users reported in the 2011 Account.