Murray-Darling Basin
37.1 Surface water allocation trade within region

The line item includes information on water allocation trade within the Murray–Darling Basin (MDB) region.  The volumetric values for the line item for the 2010–11 year were 2,728,197 ML purchased and 2,707,561 ML sold for the whole MDB region. 

Purchase volumes include water purchased internally and from outside sources for a reporting unit. Sold volumes include water sold internally and to outside areas from a reporting unit. Both allocation trade volumes and transferred volumes due to tagging of entitlements are included in the values provided in this note.

Although no allocation trade occurred between the region and external areas, purchased and sold volumes for the whole region were not equal. This could have occurred for the following reasons:

• State reporting mechanisms for trades can differ, for example when a trade is approved and then cancelled, or timing differences such as when a trade was actually approved by the state and sustainable diversion limit (SDL) area of origin and by the state or SDL area of destination.

• There may be a difference in recording the volume of water traded and approved between the originating SDL area and the destination SDL area of the water trade. For example an exchange rate or a transmission loss may be applied against the original volume of water traded in the originating state versus the state of destination.

The following two tables provide a summary and breakdown information on allocation trade within the region.

 

Summary of water allocation trade in the MDB region during the 2010–11 year

Surface water resource plan area		State	Volume (ML)
Code	Name		Purchased to the water resource plan area	Sold from the water resource plan area
SW19	Warrego – Paroo – Nebine	Qld	10	10
SW18	Condamine–Balonne	Qld	2,881	2,881
SW17	Moonie	Qld	0	0
SW16	Qld Border Rivers	Qld	68,921	49,237
SW15	NSW Border Rivers	NSW	24,380	47,680
SW11	Barwon Darling watercourse	NSW	0	0
SW12	NSW Intersecting Streams	NSW	0	0
SW14	Gwydir	NSW	60,034	60,034
SW13	Namoi	NSW	18,586	18,586
SW10	Macquarie–Castlereagh	NSW	106,708	106,708
Sub-total Northern Basin			281,520	285,136
SW9	Lachlan	NSW	69,072	69,072
SW8	Murrumbidgee NSW	NSW	528,123	577,225
SW7	NSW Murray and Lower Darling	NSW	398,018	594,267
SW3	Northern Victoria	Vic	384,190	363,870
SW2	Vic Murray	Vic	663,080	483,042
SW4	Wimmera–Mallee	Vic	0	0
SW6	Eastern Mount Lofty Ranges	SA	na	na
SW5	SA Murray	SA	404,194	334,949
SW1	ACT	ACT	na	na
Sub-total Southern Basin			2,446,677	2,422,425
Total for the region			2,728,197	2,707,561

na = Not applicable

 

Details of water allocation trade in the MDB region during the 2010–11 year

Water resource plan area	SDL area		State	Entitlement class	Volume (ML) for the 2010–11 year
	Code	Name			Purchased to the SDL area	Sold from the SDL area
Warrego – Paroo – Nebine	SS28	Warrego	Qld	Supplemented	10	10
Condamine–Balonne	SS26	Condamine–Balonne	Qld	Supplemented	2,881	2,881
Qld Border Rivers	SS24	Qld Border Rivers	Qld	Unsupplemented	6,082	9,750
				Supplemented	62,839	39,487
				Sub-total	68,921	49,237
Sub-total Queensland					71,812	52,128
NSW Border Rivers	SS23	NSW Border Rivers	NSW	High security	0	1,225
				General security	7,502	29,577
				Supplementary	16,878	16,878
				Sub-total	24,380	47,680
Gwydir	SS22	Gwydir	NSW	High security	495	7,856
				General security	31,943	24,582
				Supplementary	27,596	27,596
				Sub-total	60,034	60,034
Namoi	SS21	Namoi	NSW	High security	0	3,091
				General security	17,716	14,625
				Supplementary	870	870
				Sub-total	18,586	18,586
Macquarie–Castlereagh	SS20	Macquarie–Castlereagh	NSW	High security	33	7,865
				General security	94,777	86,945
				Supplementary	11,898	11,898
				Sub-total	106,708	106,708
Lachlan	SS16	Lachlan	NSW	High security	32,059	15,860
				General security	37,013	53,212
				Sub-total	69,072	69,072
Murrumbidgee NSW	SS15	Murrumbidgee NSW	NSW	High security	13,814	159,123
				General security	468,698	319,477
				Supplementary	45,611	45,611
				Conveyance	0	53,014
				Sub-total	528,123	577,225
Lower Darling	SS18	Lower Darling	NSW	High security	67	2,197
				General security	86,407	95,480
				Sub-total	86,474	97,677
NSW Murray	SS14	NSW Murray	NSW	High security	42,281	94,062
				Local water utility	0	695
				General security	245,848	370,683
				Supplementary	1,042	1,042
				Conveyance	22,373	30,108
				Sub-total	311,544	496,590
Sub-total New South Wales					1,204,921	1,473,572
Northern Victoria	SS5	Broken	Vic	Combined high and low reliability	30	30
	SS6	Goulburn	Vic	Combined high and low reliability	313,738	285,518
	SS7	Campaspe	Vic	Combined high and low reliability	44,737	34,730
	SS8	Loddon	Vic	Combined high and low reliability	25,685	43,592
Vic Murray	SS2	Vic Murray	Vic	Combined high and low reliability	663,080	483,042
Sub-total Victoria					1,047,270	846,912
SA Murray	SS11	SA Murray	SA	Class 2 - other urban (country town) water supply	2,300	0
				Combined classes metered	401,894	334,949
Sub-total South Australia					404,194	334,949
Total for the region					2,728,197	2,707,561

(1) New South Wales: NSW Office of Water's Water Accounting section, and (2) water audit monitoring (WAM) data received from Queensland (22 December 2011), South Australia (07 February 2012) and Victoria (31 January 2012). WAM data are stored in the Murray–Darling Basin Authority HYDRO database.

Murray–Darling Basin Authority.

WAM data were obtained from water trade registers.

The Warrego SDL area in Queensland is predominantly unsupplemented but contains the supplemented Cunnamulla Water Supply Scheme. All the allocation trade within the Warrego region is assumed to be within Cunnamulla Water Supply Scheme.

For New South Wales data, the New South Wales Government does not guarantee that water information data are current nor does it guarantee that the data or the data capturing processes are free from corruption or error. Data provided at this site are preliminary and the department's quality assurance procedures may be incomplete. The department cannot warrant and does not represent that the material that appears on its website or any linked websites is complete, current, reliable and/or free from error.

WAM sourced data do not have any uncertainty information on allocation trade.

This line item corresponds to line items T3.1.1 Within and into MDB region allocation trade regulated flows – within Basin Plan regions and T3.1.1 Within and out of MDB region allocation trade regulated flows – within Basin Plan regions, reported in the 2010 Account. In the 2011 Account, the following change was made that caused the 2009–10 year value to be restated:

• Improved data sets were made available after the publication of the 2010 Account. Restatement of the value published in the 2010 Account was made as the difference was material and increased the accuracy of the information provided to the users of the National Water Account.

The changes and their respective values are detailed in the following tables.

 

Restatement of comparative year information made for the line item 37.1 Surface water allocation trade within region – volumes purchased

2010 Account line items	Segment	Volume for the 2009–10 year reported in 2010 Account (ML)	Difference due to availability of improved data sets (ML)	Volume for the 2009–10 year reported in 2011 Account (ML)
T3.1.1 Within and into MDB region allocation trade regulated flows – within Basin Plan regions	Northern Basin	143,697	–466	143,231
	Southern Basin	1,566,862	–3,296	1,563,566
	Whole region	1,710,559	–3,762	1,706,797

  

Restatement of comparative year information made for the line item 37.1 Surface water allocation trade within region – volumes sold

2010 Account line items	Segment	Volume for the 2009–10 year reported in 2010 Account (ML)	Difference due to availability of improved data sets (ML)	Volume for the 2009–10 year reported in 2011 Account (ML)
T3.1.1 Within and out of MDB region allocation trade regulated flows – within Basin Plan regions	Northern Basin	143,697	2	143,699
	Southern Basin	1,566,804	–25,564	1,541,240
	Whole region	1,710,501	–25,562	1,684,939