General Purpose Water Accounting Report 2012–2013 ... · General Purpose Water Accounting Report...

General Purpose Water Accounting Report 2012–2013

Murrumbidgee Catchment

General Purpose Water Accounting Report 2012-2013 – Murrumbidgee catchment

ii | NSW Office of Water, September 2014

Publisher: NSW Department of Primary Industries, Office of Water

Level 18, 227 Elizabeth Street GPO Box 3889 Sydney NSW 2001

[email protected]

General Purpose Water Accounting Report 2012 -2013 – Murrumbidgee Catchment

First published: April 2014, Revised September 2014

ISBN: 978 1 74256 615 3

This report may be cited as: Burrell M., Moss P., Petrovic J., Ali A., (2014) General Purpose Water Accounting Report 2012-2013: Murrumbidgee Catchment, NSW Department of Primary Industries, Sydney

www.water.nsw.gov.au

Cover image: Murrumbidgee River at upstream Gobarralong Bridge, courtesy of the NSW Office of Water Hydrometric Gauging Team

Jobtrack number: 13175

© State of New South Wales through the Department of Trade and Investment, Regional Infrastructure and Services 2014. You may copy, distribute and otherwise freely deal with this publication for any purpose, provided that you attribute the NSW Department of Primary Industries as the owner.

Disclaimer: The information contained in this publication is based on knowledge and understanding at the time of writing (April 2014). However, because of advances in knowledge, users are reminded of the need to ensure that information upon which they rely is up to date and to check currency of the information with the appropriate officer of the Department of Primary Industries or the user’s independent adviser.

mailto:[email protected]

http://www.water.nsw.gov.au/


i | NSW Office of Water, September 2014

Table of Contents Abbreviations ............................................................................................................................................v Glossary................................................................................................................................................... vi Introduction .............................................................................................................................................. 1 Contextual statement ............................................................................................................................... 2

Accounting extent ................................................................................................................................ 2 Climate ............................................................................................................................................. 5 Dam inflows and storage volumes .................................................................................................. 7 Major high flow events ..................................................................................................................... 9 Surface water resources and management .................................................................................... 9 Trading........................................................................................................................................... 11 Environmental water ...................................................................................................................... 13

Water Accounting Statements ............................................................................................................... 17 Physical Flows Mass Balance Diagram (2012-2013) .................................................................... 19 Water Assets and Water Liabilities ................................................................................................ 20 Changes in Water Assets and Water Liabilities ............................................................................ 21

Note disclosures .................................................................................................................................... 24 Reconciliation and future prospect descriptions ................................................................................ 25 Note 1 – Allocation accounts ............................................................................................................. 27 Note 2 - Available Water Determination (AWD) (allocation announcement) .................................... 30 Note 3 – Allocation account usage .................................................................................................... 35 Note 4 - Uncontrolled flow usage ...................................................................................................... 37 Note 5 - Supplementary account usage ............................................................................................ 39 Note 6 - Allocation assignments (temporary trading) ........................................................................ 45 Note 7 - Intervalley Trade Account (IVT) ........................................................................................... 47 Note 8 - Held environmental water .................................................................................................... 50 Note 9 - Environmental provisions .................................................................................................... 54 Note 10 - Snowy required annual release ......................................................................................... 59 Note 11 - Prior year account adjustment ........................................................................................... 62 Note 12 - Surface water storage ....................................................................................................... 63 Note 13 - River channel storage ........................................................................................................ 64 Note 14 - Storage inflow .................................................................................................................... 66 Note 15 - Storage evaporation and storage rainfall .......................................................................... 68 Note 16 - Gauged tributary inflow ...................................................................................................... 69 Note 17 - Ungauged runoff estimate ................................................................................................. 70 Note 18 - River evaporation and river rainfall .................................................................................... 71 Note 19 - Return flows (including re-credit) ....................................................................................... 72 Note 20 - Dam releases, river inflow from dam releases .................................................................. 74 Note 21 - End of system flow............................................................................................................. 76

General Purpose Water Accounting Report 2012-2013 – Murrumbidgee Catchment

ii | NSW Office of Water, September 2014

Note 22 - Diversions to Lowbidgee ................................................................................................... 79 Note 23 - Extractions from river ......................................................................................................... 81 Note 24 - Basic rights extractions ...................................................................................................... 82 Note 25 - Unaccounted volume ......................................................................................................... 83 Note 26 – River and groundwater interaction .................................................................................... 84

Appendix 1 - Groundwater..................................................................................................................... 85 Groundwater management ................................................................................................................ 86 Groundwater availability .................................................................................................................... 88 Groundwater account summaries ..................................................................................................... 91 Groundwater flows ............................................................................................................................. 95

Tables Table 1: 2012-13 monthly rainfall and historical monthly statistics at Tumbarumba and

Hay .....................................................................................................................................5 Table 2: Water account data accuracy estimates key .................................................................. 18 Table 3: Explanatory information for allocation account summary ............................................... 28 Table 4: Allocation account balance summary 2012-13 ............................................................... 29 Table 5: Priority of access licence categories ............................................................................... 31 Table 6: Allocation summary report descriptions .......................................................................... 32 Table 7: Murrumbidgee Regulated River Available Water Determination announcements

2012-13 ........................................................................................................................... 33 Table 8: Licence category metered usage apportionment table ................................................... 36 Table 9: Account usage summary 2012-13 .................................................................................. 36 Table 10: Uncontrolled flow usage .................................................................................................. 38 Table 11: Total allocation assignments in the Murrumbidgee Regulated River Water

Source 2012-13............................................................................................................... 46 Table 12: Murrumbidgee intervalley trade account summary ......................................................... 49 Table 13: Explanatory information for environmental account summary ........................................ 51 Table 14: Environmental Regulated River account summary 2012-13 .......................................... 52 Table 15: Annual change summary for environmental licences and environmental holding

adjustments ..................................................................................................................... 52 Table 16: Environmental trade report summary 2012-13 ............................................................... 53 Table 17: Burrinjuck Dam translucent/transparent release summary 2004-05 to 2012-13 ............ 55 Table 18: Environmental water accounts (EWA) summaries 2004-05 to 2012-13 ........................ 56 Table 19: Provisional storage volume account summaries 2004-05 to 2012-13 ............................ 57 Table 20: Water delivered - planned environmental water held in Burrinjuck Dam 2004-05

to 2012-13 ....................................................................................................................... 58 Table 21: End of year balances for total EWA, DRB and translucency/transparency under

release 2004 -05 to 2012-13 ........................................................................................... 58 Table 22: Snowy Tumut RAR summary table ................................................................................. 60 Table 23: Prior year account adjustments summary ...................................................................... 62 Table 24: Capacity and dead storage summary table 2012-13 ...................................................... 63 Table 25: Summary of river volume calculation components ......................................................... 64


iii | NSW Office of Water, September 2014

Table 26: Break down of river volume calculation on 30 June 2013 .............................................. 65 Table 27: Components for backcalculation of inflow ...................................................................... 66 Table 28: Pan Factors utilised for evaporation calculation ............................................................. 68 Table 29: Summary of gauged inflow, 1 July 2012 to 30 June 2013 .............................................. 69 Table 30: Return flow summary table ............................................................................................. 73 Table 31: Summary of releases, 1 July 2012 to 30 June 2013 (ML) .............................................. 74 Table 32: Lowbidgee diversion measurement sites and methods of assessment ......................... 79 Table 33: Reconciliation of physical extraction to account usage .................................................. 81 Table 34: Murrumbidgee groundwater Water Sharing Plan summary ........................................... 86 Table 35: Murrumbidgee surface water catchment groundwater sources summary table:

page 1 of 2 ...................................................................................................................... 89 Table 36: Murrumbidgee surface water catchment groundwater sources summary table:

page 2 of 2 ...................................................................................................................... 90 Table 37: Explanatory information for groundwater allocation account summary .......................... 91 Table 38: Lower Murrumbidgee shallow groundwater source account summary 2012-13 ............ 92 Table 39: Lower Murrumbidgee deep groundwater source account summary 2012-13 ................ 92 Table 40: Lower Murrumbidgee groundwater sources allocation assignment (trading)

summary 2012-13 ........................................................................................................... 93

Figures Figure 1: Surface water geographical extent of the accounts ...........................................................4 Figure 2: 2012-13 monthly rainfall compared to mean and 2012-13 deviations from

historical median rainfall at Tumbarumba and Hay ...........................................................5 Figure 3: Annual rainfall for 2012-13 .................................................................................................6 Figure 4: Average annual rainfall (1961 – 1990) ...............................................................................6 Figure 5: Long-term inflows to Burrinjuck Dam against mean and reporting year inflow .................7 Figure 6: Daily inflows to Burrinjuck Dam and rainfall 2012-13 ........................................................7 Figure 7: Daily inflows to Blowering Dam 2012-13 ...........................................................................8 Figure 8: Blowering Dam storage volume and percentage full for the period 1 July 2012 to

30 June 2013 .....................................................................................................................8 Figure 9: Burrinjuck Dam storage volume and percentage full for the period 1 July 2012 to

30 June 2013 .....................................................................................................................9 Figure 10: Murrumbidgee water availability (carryover plus available water determinations) ......... 10 Figure 11: Murrumbidgee total share component and usage since the commencement of

the water sharing plan [] [] ................................................................................................ 10 Figure 12: Murrumbidgee supplementary and uncontrolled flow usage .......................................... 11 Figure 13: Total account and moving average usage relative to the long term annual

extraction limit ................................................................................................................. 11 Figure 14: Allocation assignments and net trade out of the Murrumbidgee 2012-13 ...................... 12 Figure 15: Net assignment out of the Murrumbidgee by water source location............................... 12 Figure 16: Total assignments of share component by licence category .......................................... 12 Figure 17: Share assignments purchases to environmental holders and non-environmental

holders ............................................................................................................................ 13 Figure 18: Held environmental water share component in the Murrumbidgee ................................ 14


iv | NSW Office of Water, September 2014

Figure 19: Held environmental water account usage in the Murrumbidgee .................................... 14 Figure 20: Total planned environmental water deliveries from Burrinjuck Dam 2004-05 to

2012-13 ........................................................................................................................... 15 Figure 21: Transparent/translucent releases from Burrinjuck Dam 2004-05 to 2012-13 ................. 16 Figure 22: Required environmental releases at Burrunjuck Dam vs actual releases 2012-

13 .................................................................................................................................... 16 Figure 23: Supplementary usage by river section ............................................................................ 40 Figure 24: Supplementary flow periods for 2012-13. ....................................................................... 41 Figure 25: Conceptual diagram for Coleambally Irrigation re-credits .............................................. 73 Figure 26: Daily releases from Burrinjuck and Blowering storages 2012-13 ................................... 75 Figure 27: Daily releases from Tombullen storage 2012-13 ............................................................ 75 Figure 28: Billabong Creek at Darlot flow and target ....................................................................... 77 Figure 29: Billabong Creek at Darlot flow and target (truncated at 500 ML/d) ................................. 77 Figure 30: Murrumbidgee River at Balranald flow and target .......................................................... 77 Figure 31: Murrumbidgee River at Balranald flow and target (truncated at 6,000 ML/d) ................. 78 Figure 32: Total diversions to the Lowbidgee 2012-131 ................................................................... 80 Figure 33: Murrumbidgee surface water catchment – groundwater Water Sharing Plans .............. 87 Figure 34: Lower Murrumbidgee groundwater sources water availability summary 2012-13 ......... 93 Figure 35: Lower Murrumbidgee Shallow Groundwater Source usage ........................................... 94 Figure 36: Lower Murrumbidgee Deep Groundwater Source usage ............................................... 94 Figure 37: NSW Office of Water groundwater methodologies implemented to prepare

physical groundwater data .............................................................................................. 95 Figure 38: 2012-13 Lower Murrumbidgee physical flow budget ...................................................... 96 Figure 39: Lower Murrumbidgee groundwater management area, upper aquifer and

change in groundwater levels 2012-13 (based on monitoring bore data) ...................... 96 Figure 40: Lower Murrumbidgee groundwater management area, lower aquifer and

change in groundwater levels 2012-13 (based on monitoring bore data) ...................... 97 Figure 41: 2012-13 Mid Murrumbidgee Zone 2 physical flow budget .............................................. 97 Figure 42: 2012-13 Mid Murrumbidgee Zone 3 physical flow budget .............................................. 98 Figure 43: Mid Murrumbidgee groundwater management area, upper aquifer and change

in groundwater levels 2012-13 (based on monitoring bore data) ................................... 98 Figure 44: Mid Murrumbidgee groundwater management area, lower aquifer and change in

groundwater levels 2012-13 (based on monitoring bore data) ....................................... 99 Figure 45: Potential recharge 2012-13 deviation from the long term mean, non-modelled

areas ............................................................................................................................... 99 Figure 46: Murrumbidgee catchment, non-modelled areas annual potential recharge

(1971-72 to 2012-13) .................................................................................................... 100


v | NSW Office of Water, September 2014

Abbreviations Acronym Description

ACT Australian Capital Territory

AWAS 1 Australian Water Accounting Standard

AWD Available Water Determination

CAIRO Computer Aided Improvements to River Operations

Ck Creek

DECCW NSW Department of Environment, Climate Change and Water

DISV Dry Inflow Sequence Volume

D/S Downstream

GIS Geographic Information System

GL Gigalitres (1,000,000,000 litres)

GMA Groundwater Management Area

GMU Groundwater Management Unit

GPWAR General Purpose Water Accounting Report

IQQM Integrated Quantity and Quality Model

LAS Licencing Administration System

MDBA Murray-Darling Basin Authority

ML Megalitres (1,000,000 litres)

MODFLOW Modular Three Dimensional Finite-Difference Groundwater Flow Model

NSW New South Wales

OEH Office of Environment and Heritage

QLD Queensland

RAR Required Annual Release

U/S Upstream

WASB Water Accounting Standards Board


vi | NSW Office of Water, September 2014

Glossary Term Definition

Allocation The specific volume of water allocated to water allocation accounts in a given season, defined according to rules established in the relevant water plan.

Allocation assignments The transfer of water between licence holder allocation accounts as a result of a trade agreement. The assignment becomes part of the receiver’s current year allocation account water.

Allocation Account Water account attached to an access licence used to track the balance of account water.

Aquifer Soil or rock below the land surface that is saturated with water. A confined aquifer has layers of impermeable material above and below it and is under pressure. When the aquifer is penetrated by a well, the water rises above the top of the aquifer. In an unconfined aquifer, the upper water surface (water table) is at atmospheric pressure and thus is able to rise and fall.

Available Water Determination (AWD)

The process by which water is made available for use and shared amongst water users who hold a water access licence. It determines the volume of water that is to be added to an individuals licence allocation account.

Australian Water Accounting Standard (AWAS)

A national standard that prescribes the basis for preparing and presenting a General Purpose Water Accounting Report (GPWAR). It sets out requirements for the recognition, quantification, presentation and disclosure of items in a GPWAR.

Back-calculation A calculation approach using a mass balance to determine an unknown variable (used to calculate storage inflows based on balancing the change in storage volume where inflow is the only unknown).

Basic rights The non-licensed right to extract water to meet basic requirements for household purposes (non-commercial uses in and around the house and garden) and for watering of stock. It is available for anyone who has access to river frontage on their property.

Computer Aided Improvements to River Operations (CAIRO)

A spreadsheet-based water balance model used for optimising river operations (orders and releases)

Carryover The volume or share component that may be reserved by a licence holder for use in the proceeding year.

Catchment The areas of land which collect rainfall and contribute to surface water (streams, rivers, wetlands) or to ground-water. A catchment is a natural drainage area, bounded by sloping ground, hills or mountains, from which water flows to a low point.

Conveyance licence Defined licence category that provides an allowance for losses in the delivery of water.

Dead storage The volume in storage that is generally considered unavailable for use (e.g water level below release valves) due to access and often poor water quality.

Dealings A water dealing refers to a change that can be made to a licence, in particular, those arising from trading including the sale of all or part of an access licence or account water. May also include a change in location, licence category or consolidation/subdivision of licences.

Double entry accounting Double-entry accounting is a method of record-keeping that records both where money (or in this case water) comes from and where it goes. Using double-entry means that water is never gained or lost - it is always transferred from somewhere (a source account) to somewhere else (a destination account).

Effective storage The total volume of storage minus the dead storage component – the volume generally considered as useable.

Effluent Flow leaving a place or process. Sewage effluent refers to the flow leaving a sewage treatment plant. An effluent stream is one which leaves the main river and does not return.


vii | NSW Office of Water, September 2014

Entity A defined geographical area or zone within the accounting region. Transactions and reports are produced for each entity.

End of system The last defined point in a catchment where water information can be measured and/or reported.

Environmental water Water allocated to support environmental outcomes and other public benefits. Environmental water provisions recognise the environmental water requirements and are based on environmental, social and economic considerations, including existing user rights.

Equity Total assets minus total liabilities

Evaporation The process by which water or another liquid becomes a gas. Water from land areas, bodies of water, and all other moist surfaces is absorbed into the atmosphere as a vapour.

Evapotranspiration The process by which water is transmitted as a vapour to the atmosphere as the result of evaporation from any surface and transpiration from plants.

Extraction The pumping or diverting of water from a river or aquifer by licensed users for a specific purpose (irrigation, stock, domestic, towns, etc). The volume is measured at the point of extraction or diversion (river pump, diversion works etc).

General Purpose Water Accounting Report (GPWAR)

A report prepared according to the Australian Water Accounting Standard. It is comprised of a number of components including a contextual statement, a Statement of Water Assets and Water Liabilities, a Statement of Change in Water Assets and Water Liabilities, a Statement of Physical Water Flows, Notes and Disclosures, and an assurance and accountability statement

General security licence A category of water access licence implemented under the Water Management Act 2000. Forms the bulk of the water access licence entitlement volume in NSW and is a low priority entitlement i.e. only receives water once essential and high security entitlements are met in the available water determination process.

Groundwater Water location beneath the ground in soil pore spaces and in the fractures of rock formations.

High security licence A category of licence water access licence implemented under the Water Management Act 2000. Receives a higher priority than general security licences but less priority than essential requirements in the available water determination process.

HYDSTRA database A database used by NSW Office of Water to store continuous time series data such as river flow, river height, and water quality.

Inflows Surface water runoff and deep drainage to groundwater (groundwater recharge) and transfers into the water system (both surface and groundwater) for a defined area.

Inter-valley trade Trade of licence holder allocation account water, via allocation assignment, from one catchment to another catchment (or state).

Intra-valley trade Trade of licence holder allocation account water, via allocation assignment, within the same catchment.

Licence Administration System (LAS)

The system used by NSW Office of Water to manage water access licence information and transaction.

Liability A legally binding obligation to settle a debt.

Median The middle point of a distribution, separating the highest half of a sample from the lowest half.

Non-physical transaction An accounting transaction representing a process that is not a component of the water cycle (e.g. an available water determination).

Physical transaction An accounting transaction representing a process of the water cycle (e.g. a extraction)

Recharge Groundwater recharge is a hydrologic process where water drains downward from surface water to groundwater. Groundwater is recharged naturally by rain, floods and snow melt and to a smaller extent by drainage directly from surface water (such as rivers and lakes).

http://en.wikipedia.org/wiki/Hydrology

http://en.wikipedia.org/wiki/Water

http://en.wikipedia.org/wiki/Surface_water

http://en.wikipedia.org/wiki/Groundwater

http://en.wikipedia.org/wiki/Rain

http://en.wikipedia.org/wiki/Snow


viii | NSW Office of Water, September 2014

Regulated river A river system where flow is controlled via one or more major man-made structures e.g. dams and weirs. For the purposes of the Water Management Act 2000 a regulated river is one that is declared by the Minister to be a regulated river. Within a regulated river system licence holders can order water against a held entitlement.

Replenishment flows Flows provided along effluent systems downstream of a water source to supply water for household, town use and stock.

Return inflows Water that has been diverted from a river by a water user and is then returned to the river after use (e.g. can include non-consumptive uses, such as hydropower, cooling water for industry or water for aquaculture). This water is included as an inflow to the basin because the water is available to be diverted downstream or will pass the basin outlet.

Share component An entitlement to water specified on the access licence, expressed as a unit share or in the case of specific purpose licences (eg. local water utility, major water utility and domestic and stock) a volume in megalitres. The amount of water a licence holder is allocated as a result of an available water determination and the amount they can take in any year is based on their share component.

Snowpack Volume of water stored in packed snow that upon melting will result in a system inflow.

Steady State A condition in a physical groundwater system where the volume does not change over time, or in which any one change in volume is continually balanced by another.

Storage A state-owned dam, weir or other structure which is used to regulate and manage river flows in the catchment and the water bodies impounded by these structures.

Storage discharge The volume of water released from storage in a specified time frame.

Storage reserve Proportion of water in a storage reserved in the resource assessment process for future essential or high security requirements (e.g. town water).

Storage volume The total volume of water held in storage at a specified time.

Supplementary water Unregulated river flow available for extraction under a supplementary licence.

Surface water All water that occurs naturally above ground including rivers, lakes, reservoirs, creeks, wetlands and estuaries.

Translucent flow The release of an agreed percentage of an incoming flow event from a dam for environmental purposes immediately downstream of the dam.

Transparent flow The release of all or part of an incoming flow event from a dam for environmental purposes at one or more sites downstream of the dam.

Tributary A smaller river or stream that flows into a larger river or stream. Usually a number of smaller tributaries merge to form a river.

Uncontrolled flow Water permitted to be extracted without debt under a general security access licence during a supplementary flow event. The extracted water may be progressively debited to the general security account if water availability exceeds predefined levels.

Ungauged catchment A catchment without a flow gauge to accurately record stream flows. Modelled estimates must be used to approximate the contribution of ungauged catchments to the main river.

Water accounting The systematic process of identifying, recognising, quantifying, reporting, assuring and publishing information about water, the rights or other claims to that water, and the obligations against that water

Water assets The physical water held in storage, as well as any claims to water that are expected to increase the future water resource (e.g. external water entering the system through intervalley trading).

Water liabilities Claims on the water assets of the water report entity including water that has been allocated to licence holder accounts or environmental accounts but yet to be taken at the end of the reporting period.

Water sharing plan A water management plan that defines the rules for sharing of water within a region under the Water Management Act 2000.


1 | NSW Office of Water, September 2014

Introduction This document is a General Purpose Water Accounting Report (GPWAR) for the regulated component of the Murrumbidgee River prepared by the NSW Office of Water under the Australian Water Accounting Standard 1 framework (WASB, 2012).

It has been prepared for the reporting period of 1 July to 2012 to 30 June 2013 and aims to provide a consolidated and informative annual summary of the available water resources and the water resource management that occurred for this period.

During the period the water source was managed and operated using the rules set out in the Water Sharing Plan for the Water Sharing Plan for the Murrumbidgee Regulated River Water Source 2003.

While groundwater has not been directly included in the GPWAR (aside from those processes that directly affect the regulated river), annual summary information pertaining to physical groundwater flows, and the management of groundwater resources in the Murrumbidgee is provided in Appendix 1 of the GPWAR.

As Deputy Commissioner of the NSW Office of Water, I hereby declare:

• the information presented in these accounts as a faithful representation of the management and operation applied in the 2012-13 water year for the Murrumbidgee Regulated River Water Source

• all data presented in this report is based on the best available information at the time of publication

• the NSW Office of Water has to the best of its ability prepared this GPWAR in accordance with the Australian Water Accounting Standard 1.

Bruce Cooper Deputy Commissioner, NSW Office of Water Date 2 April 2014



Contextual statement The Murrumbidgee catchment covers 84,000 km2 of southern New South Wales. It is bordered by the Great Dividing Range to the east, the Lachlan catchment to the north and the Murray catchment to the south.

The Murrumbidgee River spans almost 1,600 km, rising in the Monaro Plains near Cooma and flowing westward towards its junction with the Murray River near Balranald. The climate is extremely diverse ranging from alpine conditions in the Snowy Mountains where elevations are over 2,200 metres to semi-arid conditions on the Riverina plains where elevations are less than 50 metres.

The Murrumbidgee River is regulated by Burrinjuck Dam located near Yass at the junction of the Yass and Goodradigbee Rivers. The valley also receives water from the Snowy Mountains Scheme which is stored in Blowering Dam on the Tumut River. Downstream of Narrandera the major effluent of Yanco Creek leaves the river, feeding a series of regulated creeks that flow southwest to eventually join the Murray River. The lower end of the Murrumbidgee River is known as the Lowbidgee, a broad floodplain where the river degrades into a complex area of effluent channels and swamps.

The Murrumbidgee River flows through lands previously occupied by the Wiradjuri people, the largest Aboriginal nation in NSW. Today the Murrumbidgee catchment supports a population of approximately 520,000 people. It includes the Australian Capital Territory and national capital Canberra (314,000 people) and Wagga Wagga, the largest inland city in NSW (57,000 people). The catchment also supports numerous regional cities and towns including Cooma, Tumut, Narrandera, Griffith, Leeton, Hay and Balranald.

Major irrigation districts have developed around Griffith and Leeton producing fruit, vegetables, wine and rice. Water is delivered to these areas from the river through offtakes at Yanco, Berembed and Gogeldrie Weirs. Outside of these areas the dominant agricultural land uses are grazing and dryland cropping.

Groundwater is also an important source of water for industry and agriculture in the catchment. The groundwater and surface water systems in the catchment have a range of connectivity which varies from being highly connected on a permanent or seasonal basis to being permanently disconnected. The interaction is influenced by surface and groundwater use, climate and flood frequency, significance and duration.

Supporting a complex range of natural ecosystems, the Murrumbidgee catchment contains many significant wetland habitats such as the extensive Lowbidgee wetlands and the Tuckerbill and Fivebough Swamps listed under the international Ramsar Agreement for their ecological importance. Extensive areas of riparian river red gum forest along the middle and lower reaches of the river provide valuable riparian habitat for waterbirds and a variety of threatened fauna species.

More detailed information on the catchment is available in the report ‘Water resources and management overview: Murrumbidgee catchment’ available from the NSW Office of Water website at www.water.nsw.gov.au.

Accounting extent This report covers the extent illustrated in Figure 1 and details the water management associated with that area. It includes; the Tumut River from Blowering Dam to it’s confluence with the Murrumbidgee River, the Murrumbidgee River from Burrinjuck Dam to its confluence with the Murray River (downstream of Balranald), Billabong Creek to its junction with the Edward River downstream of Darlot, Yanco Creek and Colombo Creek. A full list of the water courses considered to be part of the regulated Murrumbidgee River can be obtained in the




Water Sharing Plan for the Murrumbidgee Regulated River Water Source 2003 (see www.water.nsw.gov.au).

While physical groundwater volumes that interact with the regulated river are included where possible in GPWAR statements, interactions that cannot be assessed form part of the unaccounted difference.

Detailed groundwater accounts for the Murrumbidgee for 2012-13, including flows and groundwater management, are excluded from the GPWAR, however supporting information on groundwater in the Murrumbidgee is provided in Appendix 1.




Figure 1: Surface water geographical extent of the accounts



Climate Rainfall in the Murrumbidgee during 2012-13 was generally below average. In the lower (western) catchment around Hay, the season started off in July 2012 with above average rainfall and the highest monthly rainfall total for the year (Figure 2). This was followed by predominately below average rainfall through to early September followed by above average rainfall from February through to the end of June 2013.

At Tumbarumba, in the high south eastern elevations of the catchment, rainfall was highly variable and about 15 per cent below the historic average for the year. January and April, 2013 were particularly dry months in this area, however above the historic lowest monthly rainfall of zero for these months (Table 1).

When viewing a wider spatial interpretation of annual rainfall across the catchment during 2012-13 compared to historic rainfall, it can be seen that rainfall was moderately and generally consistently below average for the year (Figure 3 and Figure 4).

Figure 2: 2012-13 monthly rainfall compared to mean and 2012-13 deviations from historical median rainfall at Tumbarumba and Hay

0

20

40

60

80

100

120

Jul

Aug

Sep

Oct

Nov De

c

Jan

Feb

Mar Ap

r

May Jun

Rain

fall

(mm

/mon

th)

Tumbarumba Median Hay Median

Tumbarumba 2012-13 Hay 2012-13

2012-13 monthly deviation from historical median

-45

-35

-25

-15

-5

5

15

25

35Ju

l

Aug

Sep

Oct

Nov De

c

Jan

Feb

Mar Ap

r

May Jun

mm

Tumbarumba Hay

Table 1: 2012-13 monthly rainfall and historical monthly statistics at Tumbarumba and Hay Tumbarumba Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Annual

2012-13 97.0 115.8 58.2 50.8 97.6 52.6 15.8 73.0 56.0 19.4 103.8 91.4 831.4

Historical statistics

Mean 105.4 106.6 90.6 96.4 75.4 70.6 62.1 55.1 67.1 65.6 82.4 102.5 976.1

Median 93.6 104.1 88.5 92.4 68.4 62.7 55.7 50.9 51.3 58.1 71.3 89.3 969.4

Lowest 14.2 8.6 9.6 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.5 10.6 523.6

Highest 254.6 246.6 225.3 259.7 240.2 212.4 203.2 252.2 260.4 224.6 295.4 322.1 1663.2

Highest Year 1986 1939 1960 1976 2011 1919 1897 2011 1906 1974 1942 1923 1955-1956

Hay Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Annual

2012-13 61.8 22.2 6.6 4.0 24.0 14.6 5.6 47.4 22.5 7.8 36.6 59.8 312.9

Historical statistics

Mean 31.4 32.4 30.7 35.4 26.2 27.4 27.6 29.1 29.0 28.0 35.1 35.9 367.6

Median 28.4 28.9 28.0 26.7 18.8 15.7 14.8 16.5 19.2 19.9 29.0 31.2 348.8

Lowest 1.3 0.0 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.3 142.1

Highest 100.8 107.5 105.9 150.2 152.2 152.4 191.2 203.7 199.7 151.2 133.5 115.6 892.5

Highest Year 1956 1889 1903 1975 1912 1992 1974 1973 1956 1974 1988 1923 1973-1974



Figure 3: Annual rainfall for 2012-13

Figure 4: Average annual rainfall (1961 – 1990)



Dam inflows and storage volumes In line with the reduced rainfall, annual inflows to Burrinjuck Dam were below average, with approximately 967,000 megalitres entering the storage in 2012-13. This was around 23 per cent lower than the long-term average inflow of 1,262,000 megalitres. The majority of the inflow arrived from moderate events throughout winter and spring.

The total annual inflow to the Murrumbidgee’s other major storage, Blowering Dam, was approximately 1,643,000 megalitres (no historical comparison has been provided for Blowering Dam due to the regulating effects of the upstream Snowy Hydro system). The majority of the Blowering Dam inflow water was delivered during the first half of the season with inflow sequences peaking at around 15,000 megalitres per day (total daily volume) (Figure 7).

Figure 5: Long-term inflows to Burrinjuck Dam against mean and reporting year inflow

Burrinjuck Dam Inflows

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

1890

-91

1895

-96

1900

-01

1905

-06

1910

-11

1915

-16

1920

-21

1925

-26

1930

-31

1935

-36

1940

-41

1945

-46

1950

-51

1955

-56

1960

-61

1965

-66

1970

-71

1975

-76

1980

-81

1985

-86

1990

-91

1995

-96

2000

-01

2005

-06

2010

-11

Inflo

w (x

1000

ML)

2012-13 inflow Long term inflow Mean inflow

Figure 6: Daily inflows to Burrinjuck Dam and rainfall 2012-13

0

5,000

10,000

15,000

20,000

1 Ju

l 12

1 Au

g 12

1 Se

p 12

1 O

ct 1

2

1 N

ov 1

2

1 De

c 12

1 Ja

n 13

1 Fe

b 13

1 M

ar 1

3

1 Ap

r 13

1 M

ay 1

3

1 Ju

n 13

1 Ju

l 13

Flow

(ML/

d)

0102030405060708090100

Rain

(mm

)Rainfall Burrinjuck Inflow (ML)



Figure 7: Daily inflows to Blowering Dam 2012-13

0

5,000

10,000

15,000

20,000

1 Ju

l 12

1 Au

g 12

1 Se

p 12

1 O

ct 1

2

1 N

ov 1

2

1 De

c 12

1 Ja

n 13

1 Fe

b 13

1 M

ar 1

3

1 Ap

r 13

1 M

ay 1

3

1 Ju

n 13

1 Ju

l 13

Flow

(ML/

d)Blowering Inflow (ML)

With lower inflows, and higher demands, both storages experienced an overall decline in volumes for the season. Blowering Dam started the year at 95 per cent of capacity, before declining over the summer. Some inflow events at the beginning of winter (2013) then slightly improved the storage resource to end the year at 70 per cent of capacity.

Burrinjuck Dam began the season at 94 per cent of capacity before declining over the late spring and summer. The storage remained relatively constant for the remainder of the year and finished at 42 per of capacity (Figure 9).

Figure 8: Blowering Dam storage volume and percentage full for the period 1 July 2012 to 30 June 2013

100%

80%

60%

40%

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Volu

me

(ML

x 10

00) 1,546,000 ML (95%)

1,145,000 ML (70%)



Figure 9: Burrinjuck Dam storage volume and percentage full for the period 1 July 2012 to 30 June 2013

100%

80%

60%

40%

0

200

400

600

800

1,000

1,200

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Volu

me

(ML

x 10

00)

969,000 ML (94%)

433,000 ML (42%)

Major high flow events

No major high flow events occurred in the regulated Murrumbidgee water source in 2012-13.

Surface water resources and management

At the commencement of the year there was a combined volume of 2,515,000 megalitres held in the major storages of Blowering and Burrinjuck dams. Total combined licenced carryover commitments for General Security and Conveyance licences into 2012-13 were 600,360 megalitres. Further to this there was 15,822 megalitres carried over in the planned environmental water accounts (combined), and an additional 69,325 in the under released translucent/transparent account.

Opening available water determinations were equivalent to 100 per cent of the issued entitlement for domestic and stock, local water utility and supplementary licence holders. The opening announcement for general security and conveyance licences was 0.64 megalitres per share. For general security, combined with the carryover water, this brought the total opening availability to an equivalent of 91 per cent of issued entitlement. There were two further announcements following allowing general security holders to reach 100 per cent of entitlement by 1 December 2012. The 2012-13 season was the third consecutive year of receiving 100 per cent (or greater) across all licence categories (Figure 10).

With the improved water security and confidence to plan large planted areas, 2012-13 also had the highest (combined) account usage since the introduction of the water sharing plan with over 2 million megalitres recorded against regulated licence categories (Figure 11). Further to this approximately 250,000 megalitres was delivered via uncontrolled flow conditions to supplementary licence holders (Figure 12).

While usage has increased significantly over the length of the plan, average usage still remains well below the long term average annual extraction limit (Figure 13).



Figure 10: Murrumbidgee water availability (carryover plus available water determinations)1

0

20

40

60

80

100

120

2004-2005 2005-2006 2006-2007 2007-2008 2008-2009 2009-2010 2010-2011 2011-2012 2012-13

Wat

er A

vaila

bilit

y (%

of E

ntitl

emen

t)Domestic and Stock Local Water Utility General Security High Security Conveyance

Figure 11: Murrumbidgee total share component and usage since the commencement of the water sharing plan [2] [3]

2,680,000

2,700,000

2,720,000

2,740,000

2,760,000

2,780,000

2,800,000

Shar

e Co

mpo

nent

0

500,000

1,000,000

1,500,000

2,000,000

2,500,000

2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Usa

ge (M

L)

D&S LWU GS HS Conveyance

1 Water availability refers to the sum of water that was made available in accounts and does not take into account annual use limits. It is calculated as the total carryover for a licence category plus the total available water determinations for the year. 2 Supplementary licences and uncontrolled flow has been excluded. 3 Includes all access licences issued under the water sharing plan and therefore held environmental water.



Figure 12: Murrumbidgee supplementary and uncontrolled flow usage

0

50,000

100,000

150,000

200,000

250,000

300,000

2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Annu

al U

sage

(ML/

year

)Supplementary Water (Lowbidgee) Uncontrolled flow Supplementary Water

Figure 13: Total account and moving average usage relative to the long term annual extraction limit

0

500,000

1,000,000

1,500,000

2,000,000

2,500,000

2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Usa

ge (M

L)

Total account usage Long term average annual extraction limit Moving average usage

Trading The dominating direction of trading continues to be out of the valley for the Murrumbidgee with a net volume of approximately 54,149 megalitres being trade to external valleys. This amount was relatively consistent with the previous two years and lower than years when water availability was much less (Figure 14). The majority of water moving into the Murrumbidgee (net) in 2012-13 was from Victorian water sources, while a net trade out was dominant for all other trading locations (Figure 15).

Permanent share assignments totalled around 50,000 unit shares in 2012/13. This was the first year since 2006/07 where non-environmental purchases of share component were greater than environmental purchases (Figure 17). In addition to the share assignments traded on the market there were approximately 42,000 shares of licence transfers in 2012-13.



Figure 14: Allocation assignments and net trade out of the Murrumbidgee 2012-134

-100,000

0

100,000

200,000

300,000

400,000

500,000

600,000

700,000

2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Allo

catio

n As

sign

men

ts (M

L)Allocation Assignments In Allocation Assignments Out Net Trade Out

Figure 15: Net assignment out of the Murrumbidgee by water source location

-50,000

0

50,000

100,000

150,000

200,000

2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Net

Allo

catio

n As

sign

men

ts O

ut (M

L)

NSW Murray Lower Darling Victoria South Australia

Figure 16: Total assignments of share component by licence category5

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

2005/06 2006/07 2007/08 2008/09 2009/10 2010/11 2011/12 2012/13

Shar

es a

ssig

ned

COLEAMBALLY IRRIGATION (CONVEYANCE) MURRUMBIDGEE IRRIGATION (CONVEYANCE)REGULATED RIVER (GENERAL SECURITY) REGULATED RIVER (HIGH SECURITY)SUPPLEMENTARY WATER

4 Excludes supplementary trading 5 Share assignment includes only dealings where the purchase price is greater than zero.



Figure 17: Share assignments purchases to environmental holders and non-environmental holders

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

2005/06 2006/07 2007/08 2008/09 2009/10 2010/11 2011/12 2012/13

Shar

es a

ssig

ned

environmental purchases non-environmental purchases

Environmental water Held environmental water represents water that is held as part of a licensed volumetric entitlement. In 2012-13 held environmental water continued to increase significantly (Figure 18). This was predominantly due however to changes in the management of the Lowbidgee floodplain during 2012-13. Water entitlements in this region were converted from a land (area) based entitlement to a volumetric licensed allocation and as a result a new category of licence, Supplementary (Lowbidgee), was introduced under the Water Management Act 2000. Of the total 747,000 unit shares converted to a volumetric entitlement, 155,000 unit shares were allocated as an environmental holding. In other licence categories held environmental increased by 44,097 unit shares, with the majority of this being general security (38,927 unit shares).

Held environmental account usage increased in 2012-13 and was the highest since the introduction of the water sharing plan, with approximately 174,000 megalitres being delivered to meet environmental outcomes (Figure 19).



Figure 18: Held environmental water share component in the Murrumbidgee6

0

100,000

200,000

300,000

400,000

500,000

600,000

700,000

2003-04 2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

General Security Supplementary (Lowbidgee) High SecuritySupplementary Coleambally Conveyance Murrumbidgee ConveyanceRegulated River Conveyance

Figure 19: Held environmental water account usage in the Murrumbidgee

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

160,000

180,000

200,000

2004-05 2005-06 2006-2007 2007-2008 2008-2009 2009-2010 2010-2011 2011-2012 2012-13

General Security High Security Supplementary Water Supplementary Water (Lowbidgee)

A total of 29,345 megalitres of planned environmental water was delivered during 2012-13 (Figure 20). Further details on held environmental account water is available in Note 9 of this document, while detailed information on where the water was used and the benefits achieved is available on the NSW Office of Environment and Heritage webpage (www.environment.nsw.gov.au) and the (Commonwealth) Department of Sustainability, Environment, Water, Population and Communities webpage (www.environment.gov.au).

The total water released from Burrinjuck Dam under the translucent/transparent rules of the water sharing plan were the highest since the introduction of the water sharing plan, with approximately 190,000 megalitres being released from the storage (Figure 21).

The daily release balance (DRB), was introduced at the commencement of the water sharing plan to allow the existing translucent and transparent releases to be adopted while also providing for adaptive water. The DRB increases when transparent water releases are made

6 Figures represent share at the conclusion of the water year. The licence category Supplementary (Lowbidgee) was created in 2012/13 and 155,000 ML of the total entitlement was issued as an environmental holding. Figures represent share at the conclusion of the water year.

http://www.environment.nsw.gov.au/

http://www.environment.gov.au/



triggering credits to the Environmental Water Allowance 2 (EWA2). The DRB balance is then used to reduce future requirements of translucent water releases.

During 2012-13 changes were also required to correct the balances of the DRB calculation and net under-release balances being previously adopted, due to an error discovered in implementation of the translucent and transparent releases. The DRB was zeroed by offsetting it against the historic under releases of translucent and transparent water. The corrected figures for 2012-13 and the updated historical corrections have been presented in this GPWAR (see Note 9).

There was a total of 91 days in 2012-13 where the release from Burrinjuck Dam was below the required translucent or transparent release (includes 37 days prior to correcting of the implementation calculations) (Figure 22). These events were generally within the practical allowances provided for storage operation however, in line with the water sharing plan rules the transparent/translucent under-release account was credited to ensure the missing water will be attributed to future environmental outcomes.

There were also 19 days when the release from Blowering Dam was below the required transparent release calculated. Again the majority of these shortfalls were due to the imprecise nature of operating the storage to constantly varying and precise requirements. Operators will generally adopt a minimalist approach to varying valve release rates, and will not adjust outflow if the current release is within 10 per cent of the required release.

During 2012-13 the end of system flow targets at Balranald and Darlot were considered to be met in accordance with the Water Sharing Plan. For more detail refer to Note 21.

Figure 20: Total planned environmental water deliveries from Burrinjuck Dam 2004-05 to 2012-137

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

90,000

100,000

2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Wat

er D

eliv

ered

(ML)

EWA1 DeliveredEWA2 DeliveredUnder Release Delivered

7 Under release delivered refers to releases made above the minimum required environmental translucent or transparent releases. The water is effectively used to offset any occurrences where the actual release was less than the required release.



Figure 21: Transparent/translucent releases from Burrinjuck Dam 2004-05 to 2012-13

0

50,000

100,000

150,000

200,000

250,000

2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Annu

al R

elea

se (M

L)

Transparent ReleasesTranslucent Releases

Figure 22: Required environmental releases at Burrunjuck Dam vs actual releases 2012-13

0

2,000

4,000

6,000

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Rele

ases

(ML/

d)

Actual Release (Truncated at 6,000 ML/d) Required Release



Water Accounting Statements



Significant water accounting policies The water accounting statements in this GPWAR have been prepared using an accrual basis of accounting. All figures are in megalitres (ML).

The ‘Statement of Physical Flows’ has been excluded for this GPWAR as all transactions have been presented in the statements ‘Water Assets and Liabilities’ and ‘Changes in Water Assets and Water Liabilities’.

A physical flow diagram that represents the physical movements of water has been included in order to provide a clearer picture of this process.

For general information on how to interpret the NSW Office of Water, water accounting statements, refer to the Guide to General Purpose Water Accounting Reports available for download on from the NSW Office of Water website.

Quantification of data Data accuracy It is important to recognise that the data used to account for water movement and management in the reporting entity has been obtained from a variety of sources and systems. The data ranges from observed values where a high accuracy would be anticipated through to modelled results and estimates where accuracy can be highly variable depending on a range of factors. To address the inconsistencies in accuracy and prevent misuse of the data in the accounts, all figures in the water accounting statements will be accompanied by an assessment of accuracy (Table 2).

Table 2: Water account data accuracy estimates key

Accuracy Description

A1

+/- 0% Data is determined rather than estimated or measured. Therefore the number contains no inaccuracies.

A +/- 10%

B +/- 25%

C +/- 50%

D +/- 100%



Physical Flows Mass Balance Diagram (2012-2013)

01/07/2013 51,62230/06/2012 223,921 Change: (172,299)

All figures in megalitres

Weir

Major Storage

Outflow

Inflow

Tombullen

01/07/2013 3,87530/06/2012 504

Change: 3,371

Unaccounted difference

2,019,761

Diversion to Lowbidgee

220,879

Evaporation

35,563

Inflow

27,626

1,643,45

Rainfall

Evaporation: 90,887Total River Extraction: 2,447,769

Net River Outflow to Aquifer: 122,620

River Outflows

River Inflows

Rainfall: 16,998Gauged Inflow: 494,679

Ungauged Inflow: 2,270,000

Gogeldrie Weir

01/07/2013 29430/06/2012 768

Change: (474)

01/07/2013 1,145,00030/06/2012 1,551,000

Change: (406,000)

Blowering Dam

Redbank Weir

01/07/2013 4,26530/06/2012 5,568

Change: (1,303)

162,566

End of System:Billabong Creek @ Darlot

End of System:Murrumbidgee River @ Balranald

1,244,196

Murrumbidgee RiverSystem

Hay Weir

01/07/2013 8,34130/06/2012 2,918

Change: 5,423

Outflow to Murrumbidgee Irrigation

Return2,563

Outflow to Coleambally Irrigation

30,150

2,041,52

Release

Inflow

Evaporation

27,000

36,547

710,903

Rainfall

1,234,637

Release

01/07/2013 433,32430/06/2012 966,605

Change: (533,281)

Burrinjuck Dam

Maude Weir

01/07/2013 7,88630/06/2012 6,292

Change: 1,594

Berembed Weir

01/07/2013 25530/06/2012 1,249

Change: (994)

Yanco Offtake

Return

Net Evaporation

6,448Inflow

59,895Release 50,076



Murrumbidgee catchment Water Assets and Water Liabilities For the year ended 30 June 2013 SURFACE WATER ASSETS

1. Surface Water Storage Accuracy Notes 30 June 2013 30 June 2012 Blowering Dam A 12 1,145,00

1,551,00

Burrinjuck Dam A 12 433,324 966,605 Berembed Weir A 12 255 1,249 Gogeldrie Weir A 12 294 768 Hay Weir A 12 8,341 2,918 Redbank Weir A 12 4,265 5,568 Maude Weir A 12 7,886 6,292 Tom Bullen Storage A 12 3,875 504 River B 13 51,622 223,921

Total Surface Water Storage (ASWS) 1,654,862

2,758,825

Change in Surface Water Storage (1,103,963) 81,678

2. Claims to Water Intervalley Trade Account (IVT) A1 7 (17,148) (5,693) Daily Release Balance (DRB) A1 9 8,024 94,261

Total Claims to Water (ACL)

(9,124) 88,568

Change in Total Claims to Water (97,692) 17,712

SURFACE WATER LIABILITIES

3. Allocation Account Balance Accuracy Notes 30 June 2013 30 June 2012 General Security A1 1 340,276 510,945 High Security A1 1 (21) 0 Coleambally Irrigation Conveyance A1 1 17,140 37,282 Murrumbidgee Irrigation Conveyance A1 1 0 51,990 Conveyance (Main River) A1 1 247 143

Total Allocation Account Balance (LSWS)

357,642 600,360

Change in Allocation Account Balance (242,718) (1,858)

4. Environmental Provisions

EWA1 Account A1 9 50,000 7,317 EWA2 Account A1 9 22,295 8,505 Translucent and Transparent Unmet Releases A1 9 139,648 29,546

Total Environmental Provisions (LEP) 211,943 45,368

Change in Environmental Provisions 166,575 (4,632)

NET SURFACE WATER ASSETS 5. Net Surface Water Assets (ASWS + ACL - LSWS – LEP) 1,076,153 2,201,665

Change in Net Surface Water Assets (1,125,512) 105,880



Murrumbidgee catchment Changes in Water Assets and Water Liabilities For the year ended 30 June 2013 (1 of 3) 1. Changes in Surface Water Storage (Physical Water Balance)

Surface Water Storage Increases Accuracy Notes 2012-2013 2011-2012 Blowering Dam

Inflow A 14 Natural Component A 14 368,459 763,533 Snowy Accountable Component A1 10&14 1,275,000 675,000

Rainfall B 15 27,626 46,371 Burrinjuck Dam

Inflow A 14 710,903 2,242,534 Rainfall B 15 27,000 63,374

Tombullen Off River Storage Inflow A 14 59,895 74,435

River Rainfall B 15 16,998 45,161 Gauged Tributaries8 A 16 494,679 1,321,556 Ungauged Tributaries8 C 17 2,270,000 2,272,553 Return Flows A 19

Coleambally Irrigation 30,150 72,687 Murrumbidgee Irrigation 2,563 5,862

River Inflow from Storage Releases A 20 3,326,235 3,736,595 Total Surface Water Storage Increases (ISWS) 8,609,508 11,319,661

Surface Water Storage Decreases Accuracy Notes 2012-2013 2011-2012 Blowering Dam

Evaporation B 15 35,563 31,858 Storage Release A 20 2,041,522 1,479,046

Burrinjuck Evaporation B 15 36,547 41,911 Storage Release A 20

Other A 20 1,043,919 2,031,588 Translucency A 9&20 127,526 121,550 Transparency A 9&20 63,192 53,335

Tombullen Storage Net Evaporation B 15 6,448 23,765 Storage Release A 20 50,076 51,076

River Evaporation B 18 90,887 90,135 End of System Flow A 21

Balranald8 1,244,196 2,434,553 Darlot 162,566 378,472

Diversions to Lowbidgee A 22 220,879 196,823 Extractions from River A 23 2,443,209 1,724,572 Basic Rights Extraction C 24 4,560 4,560 Net River Outflow to Aquifer D 26 122,620 214,430

Total Surface Water Storage Decreases (DSWS) 7,693,710 8,877,674 Unaccounted Volume (Balancing Item) (USWS) D 25 2,019,761 2,360,309

Net Surface Water Storage Inflow (ISWS - DSWS - USWS) (1,103,963) 81,678

8 Updated September 2014



Murrumbidgee catchment Changes in Water Assets and Water Liabilities For the year ended 30 June 2013 (2 of 3) 2. Changes in Claims to Water

Claims to Water Increases Accuracy Notes 2012-2013 2011-2012 IVT account A1 7

Water provided to Murray via Balranald & Darlot

87,542 12,083 Murrumbidgee RAR provided to Murray via Snowy (39,000) 78,000 Allocation account trade into Murrumbidgee 179,426 85,062

Daily Release Balance Increase A1 9 200 0 Total Claims to Water Increases (ICTW) 238,124 191,045

Claims to Water Decreases Accuracy Notes 2012-2013 2011-2012 IVT account A1 7

Flows provided from Murray (Via Finley Escape) 5,049 965 Allocation Account Trade out of Murrumbidgee 234,574 151,880

Daily Release Balance Decrease A1 9 96,193 20,488 Total Claims to Water Decreases (DCTW) 335,816 173,333

Net Claims to Water Balance Increase (ICTW - DCTW) (97,692) 17,712

3. Changes in Allocation Accounts

Allocation Account Increases Accuracy Notes 2012-2013 2011-2012 Available Water Determinations A1 2

Domestic and Stock 35,943 35,942 General Security 1,380,938 1,400,983 High Security (Aboriginal Culture) 2,150 1,853 High Security 358,511 356,846 High Security (Research) 300 300 High Security (Town Water Supply) 19,769 19,769 Local Water Utility 23,816 24,749 Coleambally Irrigation Conveyance 92,718 91,000 Conveyance (Main River) 2,668 2,968 Murrumbidgee Irrigation Conveyance 191,010 189,671

Internal Trading – Buyers (excl supp) A1 6 369,719 369,069 Return Flow Recredits A1 19 73,792 75,794 Allocation account water trade in from External (excl supp) A1 6 179,426 85,062 Supplementary water demand

Murrumbidgee A 5 157,714 139,786 Lowbidgee A 5 92,546 0

Uncontrolled flow A 4 0 338 Total Allocation Account Increases (IAA) 2,981,019 2,794,130

Allocation Account Decreases Accuracy Notes 2012-2013 2011-2012 Account Forfeiture A1 1

Domestic and Stock 7,333 12,289 General Security 124,149 382,639 High Security (Aboriginal Culture) 1,644 1,489 High Security (High Security) 6,117 10,023 High Security (Research) 0 2 Local Water Utility 13,485 15,319 Murrumbidgee Irrigation Conveyance 20,000 14,000 Conveyance (Main River) 1,000 1,000 Coleambally Irrigation Conveyance 3,500 4,168



Murrumbidgee catchment Changes in Water Assets and Water Liabilities For the year ended 30 June 2013 (3 of 3) 3. Changes in Allocation Accounts (con’t)

Allocation Account Decreases (con’t) Accuracy Notes 2012-2013 2011-2012 Account Usage A 3

Domestic and Stock 28,603 23,653 General Security 1,491,337 1,097,949 High Security (Aboriginal Culture) 506 364 High Security (High Security) 336,106 332,151 High Security (Research) 300 298 High Security (Town Water Supply) 19,769 19,769 Local Water Utility 10,331 7,637 Coleambally Irrigation Conveyance 103,633 88,550 Conveyance (Main River) 1,564 1,715 Murrumbidgee Irrigation Conveyance 200,800 102,010 Supplementary Water A 5

Murrumbidgee 157,714 139,786 Lowbidgee 92,546 0

Uncontrolled flow usage A 4 0 338 Internal Trading of Allocation Account Water – Sellers (excl supp) A1 6 369,719 369,069

Allocation account trade out to External (excl supp) A1 6 233,574 151,880 Licenced cancelled A1 1 8 2,266 Prior Year Account Adjustments A1 11 0 17,623 Total Allocation Decreases (DAA) 3,223,737 2,795,988 Net Allocation Account Balance Increase (IAA - DAA) (242,718) (1,858)

4. Changes in Environmental Provisions Environmental Provisions Increases Accuracy Notes 2012-2013 2011-2012 Environmental Provisions Increases (Iep) A1 9 403,246 437,696 Environmental Provisions Decreases Total Decreases in Environmental Provisions (Dep) A1 9 236,671 442,328 Net Environmental Provision Balance Increase (Iep – Dep) 166,575 (4,632)

5. Changes in Net Surface Water Assets

Change in Net Surface Water Assets (Isws-Dsws-Usws+Icts-Dctw-Iaa+Daa-Iep+Dep) (1,125,512) 105,880



Note disclosures



Reconciliation and future prospect descriptions

This section contains reconcilliation anf future prospect descriptions for the Murrumbidgee regulated river water source.

Reconciliation of change in net water assets to net change in physical water storage

2012-13 2011-12

ML ML

CHANGE IN NET SURFACE WATER ASSETS (1,125,512) 105,880

NON-PHYSICAL ADJUSTMENTS * Net Change in Allocation Accounts (242,718) (1,858) Net Change in Claims to Water: Intervalley 11,455 22,300 Net Change in Claims to Water: DRB 86,237 (4,588) Net Change in Claims to Water: EWA1 42,683 (42,683) Net Change in Claims to Water: EWA2 13,790 8,505 Net Change in Claims to Water: Translucent/Transparent 110,102 29,546

TOTAL NON-PHYSICAL ADJUSTMENTS 21,549 11,222

NET CHANGE IN PHYSICAL SURFACE WATER STORAGE (1,103,963) 117,102

Reconciliation of closing water storage to total surface water assets

30 June 2013 30 June 2012

ML ML

CLOSING WATER STORAGE

Surface Water Storage 1,654,862 2,758,825 Plus:

Other Claims to Water (9,124) 88,568 Less:

Volume in River 51,622 223,921

TOTAL SURFACE WATER ASSETS 1,594,116 2,623,472

Notes:

* Non-physical changes to the water asset added back into the 'Change in Net Water Assets' to reflect the physical volumetric change in the water storage from the previous year.

All figures can be derived from or found directly in the Water Accounting Statements of the General Purpose Water Accounting Report.



Water assets available to settle water liabilities and future commitments within 12 months of reporting date

(ML) Note (ML) Total Water Assets as at 30 June 2011 (WARP) 1,594,116 Plus: Water Assets increases within 12 months of reporting date (WAI) Current Storage Inflow Recession 0 (a) Usable Downstream Inflow Recession 0 (a) Minimal Usable Downstream Inflow 41,000 (b) Snowy RAR 485,000 24 Minimum Storage Inflows 233,000 (c) 759,000

Less: Water assets not available to be accessed and taken or delivered within 12 months of reporting date (WA NA)

Transmission Loss 410,000 (d) Storage Reserve 50,000 (e) Evaporation 60,000 (f) Unusable inflow late arrival 60,000 (g) End of System Target 218,000 21 Dead Storage 29,632 12 827,632 Water assets available to be accessed and taken or delivered within 12 months of reporting date. 1,525,484

Less: Water liabilities and future commitments expected to be settled within 12 months of the reporting date.

Water Liabilities expected to be delivered within 12 months of reporting date (WL E)

Surface Water Carryover 357,642 1 EWA1 Account 50,000 9 EWA2 Account 22,295 9 Translucent and Transparent Unmet Releases 3,655 9 433,592

Future Commitments expected to be delivered within 12 months of reporting date. (FC)

Indicative Allocations and Basic Rights (h) General Security 340,500 1 Towns 44,000 1 Domestic and Stock 36,000 1 High Security 340,000 1 Conveyance 272,000 1 Basic Rights 4,560 24 Environmental Provisions (i) EWA1 0 PSV1 0 1,037,060 1,470,652 Surplus of available water assets over water liabilities and future commitments expected to be settled within 12 months of the reporting date (SWA) SWA = (WARP + WAI - WANA - WL E – FC) (j) 54,832

Notes: (a) Inflow recessions represent the volume remaining in the current storage or downstream inflow recessions in excess of the minimum

long term inflow. The usable portion of that is that part of the inflow that can be used to settle liabilities or future committments. (b) The minimal usable portion of the downstream inflow that can be used to settle liabilities or future committments. (c) The statistical longterm annual minimal inflow sequence to the storages. (d) This is the volume of water set aside to account for the losses encountered in the delivery of the water liabilities and future

committment (e) Water set aside as the minimum storage volumes that Burrinjuck and Blowering Dams will be drawn down to. They are set at 25,000

megalitres for both storages. (f) This is an estimate of the annual impact of the net effect rainfall and evaporation on the storages. (g) This represents an estimate of the post February inflows that are not available resources for early season allocations. (h) Indicative Allocation represents a starting allocation of 18 per cent for General Security (including Regulated River Conveyance), 66%

Murrumbidgee Irrigation Conveyance, 86% Coleambally Conveyance ,100% for Towns (including High Security(Town Water Suply) licences), 100% for Domestic and Stock and 95% for High Security Licences.

(i) When general security allocation plus carry over exceed 60% EWA1 and PSV1 receive 50,000 megalitres and 25,000 megalitres respectively. With general security allocation plus carryover start the year less than 60% both EWA1 and PSV1 do not receive any water.

(j) Uncommitted water that is set aside for future increases to allocations which are delayed due to the uncertainty surrounding unprecidented system losses and uncertainties of future inflows.



Note 1 – Allocation accounts

This note is reference for the volume held in the allocation accounts at the time of reporting but also relevant for the various processes that occur to either increase or decrease an allocation account throughout the water year.

The volume of water that is in the licence allocation accounts at the time of reporting is a net balance for the relevant licence category and represents that water that can be carried forward to the next water year as dictated by the carryover rules in place for that year or required under the water sharing plan.

A negative number for the carryover figure indicates that more usage has occurred than has been allocated to the account, and the deficit must be carried forward to the next season.

Water that is in accounts at the end of a water year but is not permitted to be carried over is forfeited and has been represented as a decrease in water liability. The accounting presented is relevant to licence category and therefore is inclusive of licences held by environmental holders (environmental holdings are specifically detailed in note 8)

Supplementary water was not strictly represented as a water liability in the accounting statements the same way other licence categories were. Details about supplementary usage and events can be found in Note 5.

Data type

Derived from measured data

Policy

Water Sharing Plan for the Murrumbidgee Regulated River Water Source 2003

Available on the NSW Office of Water website at www.water.nsw.gov.au

Data accuracy

A1 – Nil inaccuracy +/- 0%

Providing agency

NSW Office of Water

Data source

State Water Corporation/NSW Office of Water – Water Accounting System (joint ownership)

Methodology

The carryover volume of water in the allocation account for each licence category is determined once all transactions and end of year forfeit rules have been applied. Below is list of typical transactions that can apply to an allocation account:

• Available water determination (detailed in note 2) • Licenced usage (detailed in note 3) • Forfeiture due to:

o Carryover rules

o Account spillage as a result of AWD

o Licence conversions

• Trade of allocation water between accounts (detailed in notes 6 and 7)




• Determined carryover volume Additional information

The tables on the following page provide a balanced summary of the water allocation accounts for each category of access licence. Below is a description of each of the table components.

Table 3: Explanatory information for allocation account summary

Heading Description

Share This is the total volume of entitlement in the specific licence category.

Opening The volume of water that has been carried forward from previous years allocation account.

AWD

The total annual volume of water added to the allocation account as a result of allocation assessments.

Licences New Increased in account water as a result of the issuing of a new licence.

Cancelled Decrease in account water as a result of a licence cancellation.

Assignments In Increase in account water as a result of Temporary Trade in.

Out Decrease in account water as a result of Temporary Trade out.

Snowy Borrow In Increase in account water as a result of a transfer of water in from another reporting

entity e.g. Snowy Borrow.

Out Decrease in account water as a result of a transfer of water out of the reporting entity e.g. Snowy Borrow repayment.

Account Usage

Controlled Volume of water that is debited against the allocation accounts and is accountable against the licence.

Uncontrolled Volume of water that is extracted under high flow conditions that is not accountable against the licence. This differs from Supplementary water in that it becomes accountable once specific allocation levels are exceeded.

Recredit That part of Coleambally Irrigation return flows credited back to their general security account.

Available Balance That part of the remaining account balance that is available to be taken at the conclusion of the water year.

Non Available Balance That part of the remaining account balance that is not available to be taken at the conclusion of the water year.

End of Year Forfeit Account water that is forfeited at the end of the water year as a result of carryover rules that restrict the carry forward volume.

Carry Forward This represents the account water that is permitted to be carried forward into the next water year as determined by the carryover rules.



Table 4: Allocation account balance summary 2012-13

Category Share Opening Balance AWD

Licences Assignments Account Usage Recredit

End of Year Balance End of Year

Forfeit

Carry Forward New Cancelled In Out

Available Balance

Unavailable Balance

Coleambally Irrigation (Conveyance) 130,000 37,282 92,718 0 0 0 5,727 103,633 0 20,640 0 3,500 17,140

Domestic and Stock 22,266 0 22,266 0 0 0 0 16,243 0 6,023 0 6,023 0

Domestic and Stock [Domestic] 267 0 270 0 3 0 0 80 0 187 0 187 0

Domestic and Stock [Stock] 13,403 0 13,407 0 4 0 0 12,280 0 1,122 0 1,122 0

Local Water Utility 23,816 0 23,816 0 0 0 0 10,331 0 13,485 0 13,485 0

Murrumbidgee Irrigation (Conveyance) 243,000 51,990 191,010 0 0 12,400 34,600 200,800 0 20,000 0 20,000 0

Regulated River (Conveyance) 2,968 143 2,668 0 0 0 0 1,564 0 1,247 0 1,000 247

Regulated River (General Security) 1,891,163 510,945 1,380,938 0 1 531,159 541,071 1,491,337 73,792 464,425 0 124,149 340,276

Regulated River (High Security) 358,511 (0.1) 358,511 0 0 5,585 21,895 336,106 0 6,095 0 6,116 (21)

Regulated River (High Security) (Aboriginal Cultural) 2,150 0 2,150 0 0 0 0 506 0 1,644 0 1,644 0

Regulated River (High Security) (Research) 300 0 300 0 0 0 0 300 0 0 0 0 0

Regulated River (High Security) (Town Water Supply) 19,769 0 19,769 0 0 0 0 19,769 0 0 0 0 0

Supplementary Water 198,780 0 198,780 0 0 40,874 41,874 157,714 0 40,066 0 40,066 0

Supplementary Water (Lowbidgee) 747,000 0 747,000 0 0 0 92,546 0 654,454 0 654,454 0



Note 2 - Available Water Determination (AWD) (allocation announcement)

This is the process by which the regulated surface water asset available for use within the regulated system is determined and shared. It determines the volume of water that is to be added to an individuals licence allocation account. Announcements of allocations are made on a seasonal basis - usually corresponding with the financial year and are updated on a regular basis or following significant inflow events. Under the Water Management Act 2000 the announcements are termed available water determinations, while prior to this under the Water Act 1912 this process was known as an allocation announcement.

Data type

Derived from measured data.

Policy

Water Management Act 2000 (NSW).

Chapter 3 – Part 2 Access Licences. o Clause 59 – Available Water Determinations.


Part 8 – Limits to the availability of water o Division 2 – Available Water Determinations.


Data accuracy


Providing agency

NSW Office of Water.

Data source

State Water/NSW Office of Water – Water Accounting System (Joint ownership of system).

Available Water Determination Register - NSW Office of Water website at www.water.nsw.gov.au

Methodology

The AWD procedure itself is generally divided into two sections; the available water asset, and system commitments. Once system commitments have been met the available water asset is then available for distribution to the access licence categories in order of priority (see following table). The volume of the announced allocation is expressed as the percentage of share component of the licence.





Table 5: Priority of access licence categories

Licence Category AWD Priority

General Security Low

High Security High

Conveyance Low

Domestic and Stock* Very High

Local Water Utility Very High

Note: Domestic and Stock is further broken down into three sub categories: Domestic and Stock, Domestic and Stock (Domestic) and

Domestic and Stock (Stock). For the purposes of this report and the general purpose water account they have been aggregated.

Available Water Asset – this is calculated by summing the water currently available in storage, future (minimum) inflows to the system, and additional volumes due to recessions of inflows from the current levels to the minimum inflow levels. Also taken into consideration is the reduction of the total inflows to the system for those that arrive too late in the season to be useful.

System Commitments – this is an assessment of the existing commitments that have to be delivered from the Available Water Asset in either the current or future years. Key components include:

essential supplies include things such as town water supplies, stock and domestic requirements, industrial use and permanent plantings (e.g. orchards, vineyards) and environmental allowances undelivered account water is the water that is already in accounts that is yet to be provided end of system flow requirement is an estimate of the flow that to pass through the system as a result of operation of the system losses which are estimated as the amount of water that will be lost by the system either through evaporation or in the process of delivering the water via transmission losses

It should be noted that the AWD for supplementary licence accounts is a separate process and is not dependent on water asset available. It is made once at the start of the year and unless there is a management change due to the growth in use strategy it is maintained at the maximum value prescribed in the plan generally 100 per cent of share component. Therefore it is not considered to create a liability on the system and is only considered in terms of an extraction that reduces the water asset.



Additional information

The following pages contain the annual allocation summary report. Below is a table containing report notes to help interpret the report.

Table 6: Allocation summary report descriptions

Table Headings Description

Opening Remaining allocation account balances at the conclusion of the previous season that is allowed to be carried forward to this season.

Individual Announcement Actual announcement made to each licence category

Share Component (Entitlement) Sum of the licensed volume of water within the licence category on the announcement date.

Announced Volume Volume of water credited to accounts within a licence category as a result of the announcement made.

Cumulative Volume Cumulative total of the announced volumes for the water year and licence category.

Percent of Share Component (Entitlement)

This is the announced volume expressed as a percentage of the entitlement applicable on the particular date.

Balance Made Available Sum of water available in allocation accounts that has been made available to be taken during the season.

Non Available Balance Water allocated that is not accessible at this point in time.

Supplementary Water Water that is not a stored source of water and is only made available if an uncontrolled flow event occurs.



Page 1 of 2

Table 7: Murrumbidgee Regulated River Available Water Determination announcements 2012-13

Date Individual Announcement

Share component

Allocation Volume

(ML)

Cumulative Volume

(ML)

% of Entitlement

Cumulative %

Balance Available

(ML)

Non Available

(ML)

Total (ML)

Balance Available

(%)

Balance Total (%)

COLEAMBALLY IRRIGATION (CONVEYANCE) 1-Jul-12 Start 130,000 37,282 0 37,282 29 29 1-Jul-12 AWD 0.9326 ML per Share 130,000 121,238 121,238 93 93 158,520 0 158,520 122 122

15-Nov-12 AWD 0.007468 ML per Share 130,000 971 122,209 1 94 159,491 0 159,491 123 123 1-Dec-12 AWD 0.059932 ML per Share 130,000 7,791 130,000 6 100 167,282 0 167,282 129 129

DOMESTIC AND STOCK 1-Jul-12 Start 22,266 0 0 0 0 0 1-Jul-12 AWD 100.0 % 22,266 22,266 22,266 100 100 22,266 0 22,266 100 100

DOMESTIC AND STOCK[DOMESTIC] 1-Jul-12 Start 270 0 0 0 0 0 1-Jul-12 AWD 100.0 % 270 270 270 100 100 270 0 270 100 100

DOMESTIC AND STOCK[STOCK] 1-Jul-12 Start 13,406 0 0 0 0 0 1-Jul-12 AWD 100.0 % 13,406 13,406 13,406 100 100 13,406 0 13,406 100 100

LOCAL WATER UTILITY 1-Jul-12 Start 23,816 0 0 0 0 0 1-Jul-12 AWD 100.0 % 23,816 23,816 23,816 100 100 23,816 0 23,816 100 100

MURRUMBIDGEE IRRIGATION (CONVEYANCE) 1-Jul-12 Start 243,000 51,990 0 51,990 21 21 1-Jul-12 AWD 1.0 ML per Share 243,000 243,000 243,000 100 100 294,990 0 294,990 121 121

REGULATED RIVER (CONVEYANCE) 1-Jul-12 Start 2,968 143 0 143 5 5 1-Jul-12 AWD 0.64 ML per Share 2,968 1,900 1,900 64 64 2,043 0 2,043 69 69

15-Nov-12 AWD 0.04 ML per Share 2,968 119 2,018 4 68 2,162 0 2,162 73 73 1-Dec-12 AWD 0.32 ML per Share 2,968 650 2,668 22 90 2,811 0 2,811 95 95



Page 2 of 2

Table 7: Murrumbidgee Regulated River Available Water Determination announcements 2012-13

Announcement date

Individual Announcement

Share component

Allocation Volume

(ML)

Cumulative Volume

(ML)

% of Entitlement

Cumulative %

Balance Available

(ML)

Non Available

(ML)

Total (ML)

Balance Available

(%)

Balance Total (%)

REGULATED RIVER (GENERAL SECURITY) 1-Jul-12 Start 1,891,920 511,009 0 511,009 27 27 1-Jul-12 AWD 0.64 ML per Share 1,891,920 1,210,878 1,210,878 64 64 1,721,887 0 1,721,887 91 91

15-Nov-12 AWD 0.04 ML per Share 1,891,995 75,682 1,286,560 4 68 1,797,569 0 1,797,569 95 95 1-Dec-12 AWD 0.32 ML per Share 1,891,995 95,046 1,381,606 5 73 1,892,615 0 1,892,615 100 100

REGULATED RIVER (HIGH SECURITY) 1-Jul-12 Start 358,511 36 0 36 0 0 1-Jul-12 AWD 0.95 ML per Share 358,511 340,587 340,587 95 95 340,623 0 340,623 95 95

1-Dec-12 AWD 0.05 ML per Share 358,511 17,924 358,511 5 100 358,547 0 358,547 100 100 REGULATED RIVER (HIGH SECURITY)[ABORIGINAL CULTURAL]

1-Jul-12 Start 2,150 0 0 0 0 0 1-Jul-12 AWD 95.0 % 2,150 2,042 2,042 95 95 2,042 0 2,042 95 95

23-Aug-12 AWD 5.0 % 2,150 108 2,150 5 100 2,150 0 2,150 100 100 REGULATED RIVER (HIGH SECURITY)[RESEARCH]

1-Jul-12 Start 300 0 0 0 0 0 1-Jul-12 AWD 95.0 % 300 285 285 95 95 285 0 285 95 95

23-Aug-12 AWD 5.0 % 300 15 300 5 100 300 0 300 100 100 REGULATED RIVER (HIGH SECURITY)[TOWN WATER SUPPLY]

1-Jul-12 Start 19,769 0 0 0 0 0 1-Jul-12 AWD 95.0 % 19,769 18,780 18,780 95 95 18,780 0 18,780 95 95

23-Aug-12 AWD 5.0 % 19,769 988 19,769 5 100 19,769 0 19,769 100 100 SUPPLEMENTARY WATER

1-Jul-12 Start 198,780 0 0 0 0 0 1-Jul-12 AWD 1.0 ML per Share 198,780 198,780 198,780 100 100 198,780 0 198,780 100 100

SUPPLEMENTARY WATER (LOWBIDGEE) 4-Oct-12 AWD 1.0 ML per Share 747,000 747,000 747,000 100 100 747,000 0 747,000 100 100



Note 3 – Allocation account usage

This is the volume of water that is extracted, diverted or measured as usage and is accountable against an access licence issued under the water sharing plan. This figure excludes that water accounted as uncontrolled flow which is accounted for separately (see Note 4).

Data type

Measured/administration data

Policy



Data accuracy

A – Estimated in the range +/- 10%

Providing agency

NSW Office of Water

Data source


Methodology

Usage information is determined by either on-farm meters that measure extraction, gauges on diversion works or orders/releases when the volume cannot be effectively metered, such as an environmental watering event.

Meter readings are collected for individual licence holders at intervals during the year and converted via a calibration factor to a volume of water extracted. Water diverted from the river is measured by recording the height at either the gauge or weir with the volume diverted being derived by passing these heights through a rating table. With potentially multiple categories of access licences being extracted through the same pumps additional information and methodologies are required to separate use under the various licence categories. Below is a description of these:

• Based on periods of announcement – during periods of supplementary water announcements extractions can be debited against the supplementary water licences

• Usage based on water orders – users place orders for water against an access licence and usages are debited against accounts in proportion to the orders placed.

• Licence category apportionment – if no water orders are available water extracted is apportioned against categories of access licence in order of priority as set out in the table below. The prioritising is based on the nature of and rules around each of the licence categories.

The following table provides the order in which extractions are apportioned to access licence categories in the water accounting system. This is a generic list where not all categories will necessarily appear in this GPWAR. There are also various sub categories of licence associated with some of the categories.




Table 8: Licence category metered usage apportionment table

Priority Surface water

1 Supplementary

2 Uncontrolled Flow

3 Domestic and Stock

4 Regulated River High Security

5 Regulated River General Security

6 Conveyance

7 Local Water Utility

8 Major Water Utility

Table 9: Account usage summary 2012-13

Category Account usage (ML)

Coleambally Irrigation (Conveyance) 103,633

Domestic and Stock 16,243

Domestic and Stock [Domestic] 80

Domestic and Stock [Stock] 12,280

Local Water Utility 10,331

Murrumbidgee Irrigation (Conveyance) 200,800

Regulated River (Conveyance) 1,564

Regulated River (General Security)9 1,491,337

Regulated River (High Security) 336,106

Regulated River (High Security) (Aboriginal Cultural) 506

Regulated River (High Security) (Research) 300

Regulated River (High Security) (Town Water Supply) 19,769

Supplementary Water 157,714

Supplementary Water (Lowbidgee) 92,546

9 Total account usage excluding any re-credits for Coleambally Irrigation



Note 4 - Uncontrolled flow usage

This refers to a specific volume of non debit water, as defined in the water sharing plan, pumped or diverted from the river for consumptive use by general security licence holders during periods when the extraction of supplementary water is permitted. It differs from supplementary water, which is a defined licence category that limits the volume pumped during high flow events, in that based on rules defined in the water sharing plan it can debit the licence holders general security account.

Data type

Measured data

Policy


Part 8 Limits to the availability of water o Division 2 - Available water determinations

Clause 39 Available water determinations for regulated river (general security) access licences (6)

Available on NSW Office of Water website at www.water.nsw.gov.au

Data accuracy

A - Estimated in the range +/- 10%

Providing agency

NSW Office of Water

Data source


Methodology

Uncontrolled flow usage is measured in the same way as general security extractions but is tagged as uncontrolled flow in the accounting system. Under specific rules as outlined in the water sharing plan the uncontrolled usage will be debited against the general security account in a water year. The summary of these rules is given below:

• Uncontrolled flow can be extracted, up to a limit of 0.85 megalitres per share of entitlement, without debit when the annual allocation plus carryover (effective allocation) is below 0.7 megalitres per share of entitlement.

• When uncontrolled extractions plus effective allocation exceed a volume equivalent to 0.85 ml per share of entitlement then the volume of exceedence less any previously debited exceedence water will be debited against the general security allocation account.

• When effective allocation exceeds 0.85 megalitres per share of entitlement then the uncontrolled usage less any previously debited exceedence will be debited against the general security allocation account

As uncontrolled flow is extracted through the same pumps as those extracting water under other categories of access licences additional information is required to identify periods and hence volumes of uncontrolled flow extractions. This is achieved by holders providing notification of intent to pump prior to pumping or diverting water during a declared supplementary event and provide meter readings both at the commencement and conclusion



of pumping. This enables the uncontrolled flow extraction to be assessed independent of the other categories of access licences.

In 2012-13 no water was available as uncontrolled flow.

Additional Information

Table 10: Uncontrolled flow usage

Water year Uncontrolled flow extracted

Uncontrolled flow converted to

general security allocation account

Remains accountable as

uncontrolled flow

2004-05 145,197 0 145,197

2005-06 187,302 0 187,302

2006-07 0 0 0

2007-08 0 0 0

2008-09 0 0 0

2009-10 21,977 0 21,977

2010-11 236,417 236,417 0

2011-12 44,406 44,406 0

2012-13 0 0 0



Note 5 - Supplementary account usage

This is the volume of water extracted, diverted or delivered under supplementary access licences during announced periods of supplementary water. Supplementary flow events are announced periodically during the season when high flow events occur with the period of extraction and volume of water to be extracted determined based on the rules as set out in the water sharing plans. It is important to note that supplementary access licences differ from other categories of access licence in that the volume of water announced in the available water determination refers to an annual upper limit for extractions and its provision is totally reliant on the occurrence of high flow events.

In 2012-13 a new category of licence, Supplementary (Lowbidgee), was introduced under WMA2000 to convert land (area) based rights to a volumetric entitlement. This accounts for a volume of 747,000 megalitres.

For this GPWAR the actual amount of Supplementary water taken during the year has been displayed as both an increase in water liability (demand to take from an announced event) and an equal decrease in water liability (reduction in supplementary holders account for usage), the net effect on system liability being zero. No other processes for supplementary water (available water determinations, trading etc were considered in the accounting process.

Data type

Measured data

Policy


Part 8 Limits to the availability of water

Division 2 - Available water determinations

- Clause 42 Available water determinations for supplementary water access licences

Part 9 Rules for managing access licences

Division 2 - Extraction conditions

- Clause 51 Extraction of water under supplementary water access licences

Refer to applicable Water Sharing Plan on NSW Office of Water Website at www.water.nsw.gov.au

Data accuracy


Providing agency

NSW Office of Water

Data source

State Water/NSW Office of Water – Water Accounting System (Joint ownership of System).

Methodology

Supplementary water extraction and diversion data is collected by either on farm meters that measure extraction or gauges on diversion works. Meter readings are collected for individual

http://www.water.nsw.gov.au/Water-Management/Water-sharing/default.aspx



licence holders at intervals during the year and converted via a calibration factor to a volume of water extracted. Water diverted from the river is measured by recording the height at either the gauge or weir with the volume diverted being derived by passing these heights through a rating table. However, with supplementary water being extracted through the same pumps as those extracting water under other categories of access licences additional information is required to separate out supplementary extraction. Basically licence holders provide notification of their intention to pump prior to pumping or diverting water during the declared supplementary event and provide meter readings both at the commencement and conclusion of pumping. This enables the supplementary flow extraction to be assessed independent of other categories of access licences.

The total volume of supplementary extractions is then calculated by summing the individual extractions and diversions that occurred during declared periods of supplementary flow for the water year.


Figure 23: Supplementary usage by river section

0011325341001041111261321872042882983187737881,0441,2741,3431,4321,4501,8641,9362,3983,3094,2854,741

18,06920,870

25,99630,493

32,07394,194

0 20,000 40,000 60,000 80,000 100,000

Burrinjuck Dam To GundagaiD/S Coly Main Offtake To Gogeldrie Weir

TumutColombo Ck Morundah To Coonong Weir

Gundagai To WaggaD/S Narrandera Gauge To Coly Main

Old Man CreekYanco Ck Morundah To Yanco Bridge

Wagga To CurrawarnaD/S Redbank To Balranald Weir

D/S Currawarna Bridge To Berembed WeirBillabong Ck Wangella to Darlot

Bundidgerry CreekYanco Ck Offtake To Morundah

Sheepwash Ck (Off Billabong Ck)D/S Balranad Weir To Murray

D/S Berembed Weir To NarranderaBillabong Ck Jerilderie to Algudgerie

D/S Gogeldrie Weir To Darlington PointColombo Ck Coonong Weir To Billabong

Billabong Ck Colombo Junction To JerilderieCuddell Creek (Off Yanco Ck)

Yanco Ck Wiraki To PuckawidgeeBillabong Ck Puckawidgee to Wangenella

Forest CreekYanco Ck Yanco Bridge To Wiraki

Billabong Ck Algudgerie To PuckawidgeeUri Creek

Billabong Ck D/S Of Darlot GaugeMI Sturt Canal

D/S Carrathhool To Hay WeirD/S Darlington Pt Gauge To Carrathool

Coly Main Canal OfftakeD/S Hay Weir To Maude Weir

MI Main CanalD/S Maude Weir To Redbank Weir *

Usage (ML)Total Usage = 250,257 ML Notes * Includes Supplementary (Lowbidgee) diversions of 92,543 ML

All figures in megalitres



Figure 24: Supplementary flow periods for 2012-13. Event Period: 01-Jul-2012 to 31-Oct-2012 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 1-Jul-12 Catchment Section Start Date End Date BILLABONG CREEK Billabong Ck Colombo Junction To Jerilderie 1-Jul-12 2-Oct-12 BILLABONG CREEK Billabong Ck Jerilderie to Algudgerie 1-Jul-12 2-Oct-12 BILLABONG CREEK Billabong Ck Algudgerie To Puckawidgee 1-Jul-12 2-Oct-12 BILLABONG CREEK Billabong Ck Puckawidgee to Wangenella 1-Jul-12 2-Oct-12 FOREST CREEK Forest Creek 1-Jul-12 2-Oct-12 BILLABONG CREEK Billabong Ck Wangella to Darlot 1-Jul-12 5-Oct-12 SHEEPWASH CREEK Sheepwash Ck (Off Billabong Ck) 1-Jul-12 2-Oct-12 BILLABONG CREEK Billabong Ck D/S Of Darlot Gauge 1-Jul-12 8-Oct-12 WASHPEN CREEK Washpen Creek (Off Yanco Ck) 1-Jul-12 2-Oct-12 CUDDELL CREEK Cuddell Creek (Off Yanco Ck) 1-Jul-12 2-Oct-12 COLOMBO CREEK Colombo Ck Morundah To Coonong Weir 1-Jul-12 2-Oct-12 MURRUMBIDGEE RIVER Burrinjuck Dam To Gundagai 1-Jul-12 2-Oct-12 MURRUMBIDGEE RIVER Gundagai To Wagga 1-Jul-12 2-Oct-12 COLOMBO CREEK Colombo Ck Coonong Weir To Billabong Junction 1-Jul-12 2-Oct-12 MURRUMBIDGEE RIVER Wagga To Currawarna 1-Jul-12 6-Oct-12 OLD MAN CREEK Old Man Creek 1-Jul-12 2-Oct-12 YANCO CREEK Yanco Ck Offtake To Morundah 1-Jul-12 2-Oct-12 MURRUMBIDGEE RIVER D/S Currawarna Bridge To Berembed Weir 1-Jul-12 6-Oct-12 YANCO CREEK Yanco Ck Morundah To Yanco Bridge 1-Jul-12 2-Oct-12 BUNDIDGERRY CREEK Bundidgerry Creek 1-Jul-12 7-Oct-12 BUNDIDGERRY CREEK MI Main Canal 1-Jul-12 7-Oct-12 YANCO CREEK Yanco Ck Yanco Bridge To Wiraki 1-Jul-12 2-Oct-12 MURRUMBIDGEE RIVER D/S Berembed Weir To Narrandera 1-Jul-12 8-Oct-12 YANCO CREEK Yanco Ck Wiraki To Puckawidgee 1-Jul-12 2-Oct-12 MURRUMBIDGEE RIVER D/S Narrandera Gauge To Coly Main Offtake 1-Jul-12 8-Oct-12 MURRUMBIDGEE RIVER Coly Main Canal Offtake 1-Jul-12 8-Oct-12 COONONCOOCABIL LAGOON MI Sturt Canal 1-Jul-12 8-Oct-12 MURRUMBIDGEE RIVER D/S Coly Main Offtake To Gogeldrie Weir 1-Jul-12 8-Oct-12 MURRUMBIDGEE RIVER D/S Gogeldrie Weir To Darlington Point 1-Jul-12 10-Oct-12 MURRUMBIDGEE RIVER D/S Darlington Pt Gauge To Carrathool 1-Jul-12 15-Oct-12 URI CREEK Uri Creek 1-Jul-12 17-Oct-12 MURRUMBIDGEE RIVER D/S Carrathhool To Hay Weir 1-Jul-12 17-Oct-12 MURRUMBIDGEE RIVER D/S Hay Weir To Maude Weir 1-Jul-12 18-Oct-12 MURRUMBIDGEE RIVER D/S Maude Weir To Redbank Weir 1-Jul-12 20-Oct-12 MURRUMBIDGEE RIVER D/S Redbank To Balranald Weir 1-Jul-12 24-Oct-12 MURRUMBIDGEE RIVER D/S Balranad Weir To Murray 1-Jul-12 27-Oct-12



Event Period: 01-Jul-2012 to 31-Oct-2012 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 28-Jun-12 Catchment Section Start Date End Date ISLAND CREEK Island Creek (Via Nangus) 1-Jul-12 2-Oct-12 TUMUT RIVER Tumut 1-Jul-12 2-Oct-12 NIMBO CREEK Nimbo Creek 1-Jul-12 2-Oct-12 UNNAMED WATERCOURSE Unnamed Water Course 1-Jul-12 15-Oct-12 ISLAND LAGOON Island Lagoon 1-Jul-12 2-Oct-12 BEAVERS CREEK Beavers Creek 1-Jul-12 2-Oct-12 COWABBIE CREEK Cowabbie Creek 1-Jul-12 2-Oct-12 WILSON ANABRANCH Wilson Anadranch (Off Yanco Ck) 1-Jul-12 2-Oct-12 UNNAMED WATERCOURSE D/S Narrandera Gauge To Gogeldrie Weir 1-Jul-12 8-Oct-12 BUDGEE CREEK Budgee Creek 1-Jul-12 15-Oct-12 Event Period: 09-Nov-2012 to 15-Dec-2012 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 9-Nov-12 Catchment Section Start Date End Date BILLABONG CREEK Billabong Ck Colombo Junction To Jerilderie 9-Nov-12 22-Nov-12 BILLABONG CREEK Billabong Ck Jerilderie to Algudgerie 16-Nov-12 24-Nov-12 BILLABONG CREEK Billabong Ck Algudgerie To Puckawidgee 16-Nov-12 27-Nov-12 BILLABONG CREEK Billabong Ck Puckawidgee to Wangenella 17-Nov-12 1-Dec-12 FOREST CREEK Forest Creek 16-Nov-12 24-Nov-12 BILLABONG CREEK Billabong Ck Wangella to Darlot 17-Nov-12 4-Dec-12 WASHPEN CREEK Washpen Creek (Off Yanco Ck) 9-Nov-12 15-Nov-12 SHEEPWASH CREEK Sheepwash Ck (Off Billabong Ck) 17-Nov-12 4-Dec-12 BILLABONG CREEK Billabong Ck D/S Of Darlot Gauge 17-Nov-12 8-Dec-12 COLOMBO CREEK Colombo Ck Morundah To Coonong Weir 9-Nov-12 20-Nov-12 CUDDELL CREEK Cuddell Creek (Off Yanco Ck) 9-Nov-12 15-Nov-12 COLOMBO CREEK Colombo Ck Coonong Weir To Billabong Junction 9-Nov-12 21-Nov-12 UNNAMED WATERCOURSE Unnamed Water Course 9-Nov-12 19-Nov-12 MURRUMBIDGEE RIVER Wagga To Currawarna 9-Nov-12 12-Nov-12 ISLAND LAGOON Island Lagoon 9-Nov-12 12-Nov-12 OLD MAN CREEK Old Man Creek 9-Nov-12 12-Nov-12 YANCO CREEK Yanco Ck Offtake To Morundah 9-Nov-12 15-Nov-12 BEAVERS CREEK Beavers Creek 9-Nov-12 13-Nov-12 MURRUMBIDGEE RIVER D/S Currawarna Bridge To Berembed Weir 9-Nov-12 12-Nov-12 COWABBIE CREEK Cowabbie Creek 9-Nov-12 12-Nov-12 YANCO CREEK Yanco Ck Morundah To Yanco Bridge 9-Nov-12 16-Nov-12 BUNDIDGERRY CREEK Bundidgerry Creek 9-Nov-12 13-Nov-12 BUNDIDGERRY CREEK MI Main Canal 9-Nov-12 13-Nov-12 MURRUMBIDGEE RIVER D/S Berembed Weir To Narrandera 9-Nov-12 13-Nov-12 YANCO CREEK Yanco Ck Yanco Bridge To Wiraki 17-Nov-12 18-Nov-12 WILSON ANABRANCH Wilson Anadranch (Off Yanco Ck) 17-Nov-12 27-Nov-12 YANCO CREEK Yanco Ck Wiraki To Puckawidgee 17-Nov-12 27-Nov-12 UNNAMED WATERCOURSE D/S Narrandera Gauge To Gogeldrie Weir 9-Nov-12 13-Nov-12 MURRUMBIDGEE RIVER D/S Narrandera Gauge To Coly Main Offtake 9-Nov-12 13-Nov-12 COONONCOOCABIL LAGOON MI Sturt Canal 9-Nov-12 13-Nov-12 MURRUMBIDGEE RIVER Coly Main Canal Offtake 9-Nov-12 13-Nov-12 MURRUMBIDGEE RIVER D/S Coly Main Offtake To Gogeldrie Weir 9-Nov-12 13-Nov-12 MURRUMBIDGEE RIVER D/S Gogeldrie Weir To Darlington Point 9-Nov-12 14-Nov-12 MIRROOL CREEK Mirrool Creek 9-Nov-12 13-Nov-12 MURRUMBIDGEE RIVER D/S Darlington Pt Gauge To Carrathool 9-Nov-12 17-Nov-12 URI CREEK Uri Creek 9-Nov-12 17-Nov-12 MURRUMBIDGEE RIVER D/S Carrathhool To Hay Weir 9-Nov-12 19-Nov-12 BUDGEE CREEK Budgee Creek 13-Nov-12 20-Nov-12 MURRUMBIDGEE RIVER D/S Hay Weir To Maude Weir 13-Nov-12 20-Nov-12 MURRUMBIDGEE RIVER D/S Maude Weir To Redbank Weir 15-Nov-12 22-Nov-12



MURRUMBIDGEE RIVER D/S Redbank To Balranald Weir 19-Nov-12 25-Nov-12 MURRUMBIDGEE RIVER D/S Balranad Weir To Murray 19-Nov-12 28-Nov-12 Event Period: 05-Dec-2012 to 31-Dec-2012 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 05-Dec-2012 Catchment Section Start Date End Date MURRUMBIDGEE RIVER D/S Gogeldrie Weir To Darlington Point 6-Dec-12 8-Dec-12 MURRUMBIDGEE RIVER D/S Darlington Pt Gauge To Carrathool 6-Dec-12 9-Dec-12 URI CREEK Uri Creek 6-Dec-12 11-Dec-12 MURRUMBIDGEE RIVER D/S Carrathhool To Hay Weir 6-Dec-12 11-Dec-12 MURRUMBIDGEE RIVER D/S Hay Weir To Maude Weir 9-Dec-12 12-Dec-12 MURRUMBIDGEE RIVER D/S Maude Weir To Redbank Weir 10-Dec-12 12-Dec-12 Event Period: 09-Dec-2012 to 31-Dec-2012 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 09-Dec-2012 Catchment Section Start Date End Date BUDGEE CREEK Budgee Creek 9-Dec-12 12-Dec-12 Event Period: 04-Dec-2012 to 04-Dec-2012 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 04-Dec-12 Catchment Section Start Date End Date BILLABONG CREEK Billabong Ck Algudgerie To Puckawidgee 4-Dec-12 4-Dec-12 Event Period: 15-Dec-2012 to 20-Dec-2012 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 13-Dec-12 Catchment Section Start Date End Date MURRUMBIDGEE RIVER D/S Redbank To Balranald Weir 15-Dec-12 16-Dec-12 Event Period: 01-Mar-2013 to 31-Mar-2013 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 28-Feb-13 Catchment Section Start Date End Date UNNAMED WATERCOURSE Unnamed Water Course 1-Mar-13 8-Mar-13 MURRUMBIDGEE RIVER D/S Gogeldrie Weir To Darlington Point 1-Mar-13 6-Mar-13 MURRUMBIDGEE RIVER D/S Darlington Pt Gauge To Carrathool 1-Mar-13 7-Mar-13 URI CREEK Uri Creek 1-Mar-13 7-Mar-13 MURRUMBIDGEE RIVER D/S Carrathhool To Hay Weir 1-Mar-13 8-Mar-13 BUDGEE CREEK Budgee Creek 4-Mar-13 9-Mar-13 MURRUMBIDGEE RIVER D/S Hay Weir To Maude Weir 4-Mar-13 9-Mar-13 Event Period: 11-Mar-2013 to 31-Mar-2013 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 10-Mar-13 Catchment Section Start Date End Date MURRUMBIDGEE RIVER D/S Maude Weir To Redbank Weir 11-Mar-13 14-Mar-13



Event Period: 16-Mar-2013 to 31-Mar-2013 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 14-Mar-13 Catchment Section Start Date End Date MURRUMBIDGEE RIVER D/S Redbank To Balranald Weir 16-Mar-13 19-Mar-13 MURRUMBIDGEE RIVER D/S Balranad Weir To Murray 17-Mar-13 20-Mar-13 Event Period: 05-Jun-2013 to 30-Jun-2013 Event Limit: 100.00% or 1.0000 megalitres per Share Announcement Date: 4-Jun-13 Catchment Section Start Date End Date BILLABONG CREEK Billabong Ck Colombo Junction To Jerilderie 5-Jun-13 29-Jun-13 BILLABONG CREEK Billabong Ck Jerilderie to Algudgerie 5-Jun-13 29-Jun-13 BILLABONG CREEK Billabong Ck Algudgerie To Puckawidgee 5-Jun-13 29-Jun-13 BILLABONG CREEK Billabong Ck Puckawidgee to Wangenella 5-Jun-13 29-Jun-13 BILLABONG CREEK Billabong Ck Wangella to Darlot 5-Jun-13 29-Jun-13 FOREST CREEK Forest Creek 5-Jun-13 29-Jun-13 SHEEPWASH CREEK Sheepwash Ck (Off Billabong Ck) 5-Jun-13 29-Jun-13 WASHPEN CREEK Washpen Creek (Off Yanco Ck) 5-Jun-13 11-Jun-13 BILLABONG CREEK Billabong Ck D/S Of Darlot Gauge 5-Jun-13 29-Jun-13 ISLAND CREEK Island Creek (Via Nangus) 5-Jun-13 29-Jun-13 CUDDELL CREEK Cuddell Creek (Off Yanco Ck) 5-Jun-13 11-Jun-13 NIMBO CREEK Nimbo Creek 5-Jun-13 29-Jun-13 TUMUT RIVER Tumut 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER Burrinjuck Dam To Gundagai 5-Jun-13 29-Jun-13 COLOMBO CREEK Colombo Ck Morundah To Coonong Weir 5-Jun-13 14-Jun-13 UNNAMED WATERCOURSE Unnamed Water Course 5-Jun-13 29-Jun-13 COLOMBO CREEK Colombo Ck Coonong Weir To Billabong Junction 5-Jun-13 14-Jun-13 MURRUMBIDGEE RIVER Gundagai To Wagga 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER Wagga To Currawarna 5-Jun-13 29-Jun-13 UNNAMED WATERCOURSE Unnamed Watercourse (Off Colombo Ck) 5-Jun-13 14-Jun-13 ISLAND LAGOON Island Lagoon 5-Jun-13 29-Jun-13 OLD MAN CREEK Old Man Creek 5-Jun-13 28-Jun-13 BEAVERS CREEK Beavers Creek 5-Jun-13 29-Jun-13 YANCO CREEK Yanco Ck Offtake To Morundah 5-Jun-13 12-Jun-13 MURRUMBIDGEE RIVER D/S Currawarna Bridge To Berembed Weir 5-Jun-13 29-Jun-13 COWABBIE CREEK Cowabbie Creek 5-Jun-13 29-Jun-13 YANCO CREEK Yanco Ck Morundah To Yanco Bridge 5-Jun-13 12-Jun-13 BUNDIDGERRY CREEK Bundidgerry Creek 5-Jun-13 29-Jun-13 BUNDIDGERRY CREEK MI Main Canal 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Berembed Weir To Narrandera 5-Jun-13 29-Jun-13 YANCO CREEK Yanco Ck Yanco Bridge To Wiraki 5-Jun-13 12-Jun-13 WILSON ANABRANCH Wilson Anadranch (Off Yanco Ck) 5-Jun-13 14-Jun-13 YANCO CREEK Yanco Ck Wiraki To Puckawidgee 5-Jun-13 14-Jun-13 MURRUMBIDGEE RIVER D/S Narrandera Gauge To Coly Main Offtake 5-Jun-13 29-Jun-13 UNNAMED WATERCOURSE D/S Narrandera Gauge To Gogeldrie Weir 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER Coly Main Canal Offtake 5-Jun-13 29-Jun-13 COONONCOOCABIL LAGOON MI Sturt Canal 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Coly Main Offtake To Gogeldrie Weir 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Gogeldrie Weir To Darlington Point 5-Jun-13 29-Jun-13 MIRROOL CREEK Mirrool Creek 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Darlington Pt Gauge To Carrathool 5-Jun-13 29-Jun-13 URI CREEK Uri Creek 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Carrathhool To Hay Weir 5-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Hay Weir To Maude Weir 8-Jun-13 29-Jun-13 BUDGEE CREEK Budgee Creek 8-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Maude Weir To Redbank Weir 12-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Redbank To Balranald Weir 14-Jun-13 29-Jun-13 MURRUMBIDGEE RIVER D/S Balranad Weir To Murray 15-Jun-13 29-Jun-13



Note 6 - Allocation assignments (temporary trading)

This represents the temporary trading (allocation assignments) of water between allocation accounts within the regulated Murrumbidgee River, or between different water sources.

Data type

Administration

Policy

Water Act 1912


Part 10 Access licence dealing rules o Clause 50 rules relating to constraints within a water source o Available on the NSW Office of Water Website at www.water.nsw.gov.au

Data accuracy


Providing agency

NSW Office of Water

Data source


Water Ordering and Usage database

Methodology

Trading is permitted between certain categories of access licences and between certain water sources. This is detailed in the water sharing plan or stipulated under the licence holder’s conditions.

The net effect of internal trading on committed water is zero for a water year, however these trades are still stipulated in the accounting statements to provide details on the volumes of water being traded.

Trade between water sources will either increase the committed liability for the year (trade into the Murrumbidgee) or decrease the committed liability for the year (trade out of the Murrumbidgee). The imbalance created from trading between water sources is monitored and managed with the intervalley trade account (see note 7).


The following table shows the internal trading figures between licence categories. All figures represent a volume in megalitres.




Table 11: Total allocation assignments in the Murrumbidgee Regulated River Water Source 2012-13

Murrumbidgee 2012-13 allocation assignment summary

BUYER

Murrumbidgee Lower Darling NSW Murray South Australia Victoria Total

General Security

High Security Supplementary MI

(Conveyance) General Security

General Security

High Security Supplementary River

(Conveyance) Interstate transfer

Interstate transfer

SELL

ER

Murrumbidgee

General Security 303,344.6 2,463.4 12,400.0 14,218.7 108,516.6 23,818.1 64,530.0 11,779.5 541,070.9

High Security 11,071.5 112.0 4,652.6 267.1 3,844.6 1,524.8 365.0 57.0 21,894.6

Supplementary 40,874.1 1,000.0 41,874.1

CI (Conveyance) 5,727.0 5,727.0

MI (Conveyance) 34,600.0 34,600.0

Lower Darling General Security 15,612.0 15,612.0

NSW Murray

General Security 75,023.9 75,023.9

High Security 28,475.3 3,010.0 31,485.3

River (Conveyance) 4,500.0 4,500.0

South Australia Interstate transfer 7,240.0 7,240.0

Victoria Interstate transfer 45,564.5 45,564.5

Total 531,158.8 5,585.4 40,874.1 12,400.0 18,871.3 108,783.7 27,662.7 1,000.0 1,524.8 64,895.0 11,836.5 824,592.3

Internal Trading = 410,593 Total Trade out of Murrumbidgee = 234,574

Total trade into Murrumbidgee = 179,426



Note 7 - Intervalley Trade Account (IVT)

The intervalley trade account provides ongoing tracking of valley debts and claims for water due to the temporary trading of account water between the southern connected valleys of the Murray Darling Basin.

For the Murrumbidgee this is presented in the accounting statements as an asset account whereby a positive balance is indicative of a claim to water (Murrumbidgee owed water), and a negative balance indicative of a future obligation (Murrumbidgee owes water).

Data type


Policy

Water Act 2007 (Federal)

The Murray Darling Basin Agreement (Schedule 1) – Transferring Water Entitlements and Allocations (Schedule D)

Water Management Act 2000 (NSW)

Dealings with access licences (Division 4)

- 71G Assignment of water allocations between access licences

- 71I Interstate assignment of water allocations


Part 10 Access licence dealing rules

- Clause 57 Rules for water allocation assignment between water sources

- Clause 58 Rules for interstate assignment of water allocations

Available on NSW Office of Water website at www.water.nsw.gov.au

Data accuracy


Providing agency

Murray Darling Basin Authority, NSW Office of Water

Data Sources

Murray Darling Basin Authority provided spreadsheet

State Water Corporation – Provided spreadsheet – CAIRO

NSW Office of Water – Water Accounting System – HYDSTRA

Methodology:

The balance of the IVT account is calculated by adjusting the carried forward balance of the IVT account from the previous year and applying a series of transactions to the account as outlined below. A positive balance indicates that the Murray System owes water to the Murrumbidgee System while a negative balance indicates that Murrumbidgee System owes water to the Murray System.



1. The volume of water traded into the Murrumbidgee Valley from the NSW Murray, NSW Lower Darling, Victoria or South Australia will result in the IVT being increased.

2. The volume of water traded out of the Murrumbidgee Valley to the NSW Murray, NSW Lower Darling, Victoria or South Australia will result in the IVT being decreased.

3. The Murray Darling Basin Authority (MDBA) requests that NSW deliver a proportion of the water that was traded to users outside of the Murrumbidgee. NSW supplies the requested volume and accounts for it by calculating the resulting addition volume of water passing the Murrumbidgee River at Balranald. The accounted volume supplied is agreed between State Water Corporation and MDBA and the IVT account is increased accordingly.

4. On occasion Snowy Hydro Limited may be requested to transfer a portion of either the Murrumbidgee or Murray Required Annual Release (RAR) to assist with the settlement of the IVT account when it gets too far out of balance (although there is no legal obligation on them to perform such releases). These are often referred to as "notional" releases. The following points illustrate this process:

a) Excessive Trade from Murrumbidgee to Murray creates a need to transfer Murrumbidgee RAR via the Murray development thus increasing the IVT account (reducing Murrumbidgee debt to Murray).

b) Excessive trade from Murray to Murrumbidgee creates a need to transfer Murray RAR via the Murrumbidgee development thus decreasing the IVT account (reducing Murray debt to Murrumbidgee).

5. Tagged trading is a dealing that occurs when a licence holder within a valley nominates to extract their allocation for that licence from a different water source. Any water delivered to a point of extraction within the Murrumbidgee to meet allocation associated with another water source therefore results in an increase to the IVT.

6. During periods of high summer demand transfers of water can occur from the Murray to the Murrumbidgee via Murray Irrigation Limited (MIL) infrastructure to bypass delivery constraints in either the Murray (caused by the Murray choke) or the Yanco Creek System and the Coleambally Irrigation channel network. Water passed into the Murrumbidgee via MIL, subject to MIL ability to deliver via their channel system, can help to meet the demands in Billabong Creek. The net change in the IVT as a result is calculated by assessing the difference between the flow diverted from MIL to Billabong Creek (via Finley escape) and the water that leaves the Murrumbidgee via the Billabong Creek at Darlot for the corresponding period (i.e. estimating volume extracted by users on Billabong Creek). This figure is presented as ‘Finley Borrow’ in Table 12.


The IVT Trade Balance Summary table provides information compiled from the best information available at the time of publication. These figures may change in the future as updated information becomes available. All figures in the table are in megalitres.

The note references in the table refer to the numbers associated with the text in the methodology above.



Table 12: Murrumbidgee intervalley trade account summary

Water Year Ending 30 June

Starting Balance

Inter-valley Trading

Murrumbidgee IVT Account Adjustments

Closing Balance

Increases Decreases

Into (1) Murrumbidgee

Out of (2) Murrumbidgee Net Into

Via Snowy

(4)

Via Balranald

(3)

Net Tagged Trade

(5)

Finley Borrow (6)

2004-05 0 11,805 3,779 8,026 0 4,185 0 (12,211) 0

2005-06 0 16,646 21,748 (5,102) 0 20,282 0 (10,162) 5,018

2006-07 5,018 1,209 97,195 (95,986) 20,000 70,968 0 0 0

2007-08 0 2,729 141,825 (139,096) 0 63,500 0 (728) (76,324)

2008-09 (76,324) 17,223 406,976 (389,753) 200,000 44,981 0 (6,245) (227,341)

2009-10 (227,341) 55,659 166,443 (110,784) 200,000 119,567 0 (5,318) (23,876)

2010-11 (23,876) 130,929 180,031 (49,102) 0 57,751 0 (12,766) (27,993)

2011-12 (27,993) 85,062 151,880 (66,818) 78,000 12,083 0 (965) (5,693)

2012-13 (5,693) 179,426 234,574 (55,148) (39,000) 87,542 200 (5,049) (17,148)



Note 8 - Held environmental water

This represents that environmental water that is held as part of a licensed volumetric entitlement. These licences are held within the same licence categories as all other water access licences hence are subject to the same operating rules. Therefore they are subject to the following key rules:

• Available Water Determinations (AWD) for their share of the entitlement to be added to accounts.

• Carryover rules hence the forfeiting of unused water that cannot be carried over. • Provide water orders prior to use.

These licences are used to provide environmental benefit and outcomes to the catchment by either providing water to, or supplementing water requirements of, a specific environmental events or incidents. On occasion the environmental benefit is achieved by trading the water as opposed to ordering and recording the subsequent usage against the licence.

Data type

Measured

Policy

Water Management Act 2000

• Dealings with access licences (Division 4) o 71G Assignment of water allocations between access licences


Available on the NSW Office of Water Website at www.water.nsw.gov.au

Data accuracy


Providing agency

NSW Office of Water

Data source

State Water/NSW Office of Water – Water Accounting System (Joint ownership of System).

Available Water Determination Register - NSW Office of Water website at www.water.nsw.gov.au

Methodology

The water held for the environment represents a volume of water in corresponding allocation accounts. This allocation account represents the sum of the remaining volume of held environmental water at the conclusion of the water year once all transactions and forfeit rules have been applied to the accounts. These environmental balances are at the licence category level and represent the water that can be carried forward for use in the next year. Below is list of typical transactions that can apply to an environmental allocation account:

• AWD (including pro rata of AWD for new licences) • Licensed extractions • Forfeiture due to:

− Carryover rules





− Account spillage as a result of AWD − Licence conversions − Excess orders (where water order debiting is in place)

• Trade of allocation water between accounts

In addition the trade and purchase of environmental water is tracked to capture the movement of environmental entitlement both in number of entitlements, and volume.


The table on the following page provides a summary of held environmental water for 2012-13.

Table 13: Explanatory information for environmental account summary

Heading Description

No. Licences This is the number of environmental licences held.

Share This is the total volume of share component (entitlement) in the specific licence category.


AWD The total annual volume of water added to the allocation account as a result of allocation assessments.



Snowy Borrow In Increase in account water as a result of a transfer of water in from another reporting entity e.g. Snowy Borrow

Out Increase in account water as a result of a transfer of water in from another reporting entity e.g. Snowy Borrow repayment

Account Usage Volume of water that is debit against the allocation account and is accountable against the licence.

Available Balance Account balance that is available to be taken at the conclusion of the water year.

Non Available Balance Account balance that is currently not available for use (e.g. restricted due to drought conditions or annual use limit restrictions)





Table 14: Environmental Regulated River account summary 2012-1310

Category Share Opening Balance AWD

Licences Assignments Account

usage

During Year

Forfeit

End of Year Balance End of Year

Forfeit

Carry Forward New Cancelled In Out Available

Balance Unavailable

Balance Coleambally Irrigation (Conveyance) 10,556 1,050 8,178 0 0 0 5,727 0 0 3,500 0 2,450 1,050 Murrumbidgee Irrigation (Conveyance) 21,800 6,000 14,600 0 0 0 600 0 0 20,000 0 14,000 6,000 Regulated River (Conveyance) 1,000 300 700 0 0 0 0 0 0 1,000 0 700 300 Regulated River (General Security) Excl Group11 386,153 74,003 275,443 0 0 163,443 215,009 173,379 0 124,502 0 52,953 71,550 Regulated River (General Security) Group12 1,944 583 1,361 0 0 0 0 0 0 1,944 0 1,361 583 Regulated River (High Security) 6,131 0 3,502 0 0 0 1,525 0 0 1,977 0 1,977 0 Supplementary Water - Excl Group 26,773 0 26,773 0 0 23,268 27,868 825 0 21,348 0 21,348 0 Supplementary Water-Group 642 0 642 0 0 0 0 0 0 642 0 642 0 Supplementary Water (Lowbidgee) 155,000 0 155,000 0 0 0 0 0 0 155,000 0 155,000 0

Table 15: Annual change summary for environmental licences and environmental holding adjustments

Category

30-June-12 30-June-13 Annual change (in adjusted

share component)

No. Licences Share component

Adjusted share component13

No. Licences Share component

Adjusted share component

Coleambally Irrigation (Conveyance) 2 9,227 9,227 2 10,556 10,556 1,329 Murrumbidgee Irrigation (Conveyance) 2 20,600 20,600 2 21,800 21,800 1,200 Regulated River (Conveyance) 1 1,000 1,000 1 1,000 1,000 0 Regulated River (General Security) 20 358,962 349,170 12 397,889 388,097 38,927 Regulated River (High Security) 6 3,490 3,490 6 6,131 6,131 2,641 Supplementary Water 8 33,237 27,415 8 33,237 27,415 0 Supplementary Water (Lowbidgee) 0 0 0 1 155,000 155,000 155,000

10 The account balance summary includes all licences where the registered holder or part holder is a Government department and the held component is wholly managed for environmental benefit. Water that has been purchased from consumptive users, but yet to me moved out to a government holding is not identified in this summary. Generally in the situation the water is temporarily trade out to an environmental licence until the settlement has been finalised. 11 Group holdings can occur whereby a range of holders operate under the one access licence. In some instances part of the entitlement in these licences is purchased as an environmental holding and as a result the water access licence has a proportion of its share for consumptive use and a portion of its share allocated to an environmental holding. This line of data excludes all group licences. 12 This line of data is the estimated environmental balances and transactions of the environmental component that is held within group licences (i.e. excluding consumptive components). 13 The adjusted share component column removes the consumptive share in these licences to provide a more accurate statement of the environmental holding.



Table 16: Environmental trade report summary 2012-1314

Buyer (To)

Enviro Non-enviro Total

Murrumbidgee Murray SA Vic Murrumbidgee Lower Darling NSW Murray SA Vic

GS Supp GS Convey - - GS Supp GS GS HS Supp - -

Selle

r (fr

om) Enviro

Murrumbidgee

GS 108,916 29,955 63,750 6,916 5,122 350 215,009

HS 1,525 1,525

Supp 23,268 4,600 27,868

CI (Convey) 5,727 5,727

MI (Convey) 600 600

Murray General Security 50,000 50,000

Convey 4,500 4,500

Vic Interstate transfer 1,000 1,000

Non-enviro Murrumbidgee

General Security 14,219 78,562 23,468 780 4,864 121,892

High Security 4,653 267 3,845 365 57 9,186

Supplementary 1,000 1,000

Total 165,243 23,268 29,955 1,525 63,750 6,916 10,622 4,600 18,871 78,829 27,663 1,000 1,145 4,921 438,307

14 Environmental trading report includes all trading for environmental purposes including trades moved to consumptive licence holders for environmental delivery. This summary does include water that has been purchased from consumptive users, but yet to me moved out to a government holding. The summary does also not include trading from environmental holdings within a group licence (combined consumptive and environmental entitlements). Licence category abbreviations are: GS = General Security, HS = High Security, Convey = Regulated River (Conveyance), CI Convey = Coleambally Conveyance, MI Convey = Murrumbidgee Irrigation (Conveyance), Supp = Supplementary. Location abbreviations are: SA = South Australia, Vic = Victoria, Murray = NSW Murray.



Note 9 - Environmental provisions

These were introduced as part of the water sharing plans with the aim of enhancing environmental benefits. They consist of a series of rules established around the concept of dam translucency and transparency releases, environmental water allowances (EWA), provisional storages and balancing storages and end of system flows. Below is a brief description of these:

Dam transparency - protects low flows immediately downstream of Burrinjuck and Blowering Dams by passing all inflows up to a defined limit.

Dam translucency - ensures that some degree of natural flow variability is restored downstream of Burrinjuck Dam by releasing a proportion of inflows based on the time of year and the catchment conditions.

End of system flows - maintain a flow of water to the end of the Murrumbidgee River and Billabong Creek ensuring its connectivity with the Murray River.

Environmental water allowances - three water allowances were created to provide direct benefits to the environment. The water is for discretionary environmental management such as wetland inundation, flushes to improve water quality, or providing habitat for waterbird breeding.

Provisional storage volumes – two provisional storage volumes are provided with the intent to increase the size and frequency of spill events for environmental benefits.

Daily release balance - this account maintains a record of the net difference between the minimum transparent dam release and the water credited to environmental water allowance (EWA2 allowance). The daily release balance (DRB), was introduced at the commencement of the water sharing plan to allow the existing translucent and transparent releases to be adopted while also providing for adaptive water. The DRB increases when transparent water releases are made triggering credits to the Environmental Water Allowance 2 (EWA2). The DRB balance is then used to reduce future requirements of translucent water releases.

For additional details on this refer to the environmental rules in the water sharing plan.

Data type

Derived from Measured Data

Policy


Part 3 Environmental water provisions

- Clause 13 Environmental water provisions

- Clause 14 and 15 Planned environmental water

Available from the NSW Office of Water website at www.water.nsw.gov.au

Data accuracy


Providing agency

State Water Corporation




Data source

EWA accounting spreadsheet – State Water Corporation

Methodology

Methods for evaluating the environmental provisions can be found in the water sharing plan.

At the time that water sharing plans were suspended (2006) the volumes in the EWA accounts stopped accumulating and were effectively borrowed to support the essential supplies of the river during the drought and hence not required to be paid back (although some was) until after the plans were reinstated. On 1 June 2010 the Department of Environment Climate Change and Water and NSW Office of Water agreed that EWA water would start to accrue as per water sharing plan rules even though the plan remains suspended. In addition under-releases of Burrinjuck Dam translucent/transparent flow would start to accumulate in a separate account to be used on request.

The unpaid debt of from the EWA water borrow (113,910 megalitres) made after the suspension of the water sharing plan has now been cleared with the significant improvement in resources.

Translucency releases from Blowering Dam could not be implemented as data Blowering Dam natural inflows on a daily basis are unavailable. As such it has been treated as a minimum storage release figure of 560 megalitres per day and hence not accounted for separately within this GPWAR.

The Daily Release Balance has been accumulating since the commencement of the plan. The intent of use for the volume of water accumulated in this account is still unknown and to date the balance continues to be carried forward.

The following tables show account summaries, water deliveries and balances for those accounts established as a result of the environmental provisions as set out in the water sharing plan as at 30 June 2013.


The following group of tables provides a comprehensive summary of the Planned Environmental Water since the commencement of the water sharing plan. It should be noted that variations to numbers published in previous years may exist resulting from a review of the accounting process at the conclusion of the drought.

Table 17: Burrinjuck Dam translucent/transparent release summary 2004-05 to 2012-13

Year Translucent Release Transparent Release

Other Releases

Total Releases Required Translucent

Releases Required Transparent

Releases

2004-05 2,454 3,401 105,192 121,447 394,130 518,978

2005-06 68,748 25,704 73,511 72,961 522,043 620,708

2006-07 25,476 6,462 76,739 71,770 132,647 210,879

2007-08 35,310 6,198 65,140 48,214 172,207 226,619

2008-09 7,609 3,281 110,130 80,769 174,983 259,033

2009-10 28,488 9,101 27,168 18,763 394,372 422,236

2010-11 92,707 24,636 103,785 99,968 1,631,538 1,756,142

2011-12 195,310 121,550 48,900 53,335 2,031,588 2,206,473

2012-13 148,099 127,526 62,780 63,192 1,043,919 1,234,637



Table 18: Environmental water accounts (EWA) summaries 2004-05 to 2012-13 15

Water Year

EWA1 16 EWA2 EWA3

Accrued Delivered Spill Balance End of Year Forfeit

Carry Forward

Accrued Delivered Balance End of Year Forfeit

Carry Forward

Accrued Delivered Credited to PSV2

Balance End of Year Forfeit

Carry Forward

2004-05 0 0 0 0 0 0 42,497 0 42,497 0 42,497 0 0 0 0 0 0

2005-06 50,000 0 0 50,000 0 50,000 46,607 19,050 46,607 23,447 46,607 0 0 0 0 0 0

2006-07 17 0 0 0 50,000 0 50,000 17,303 0 63,910 0 63,910 0 0 0 0 0 0

2007-08 0 0 0 50,000 0 50,000 0 8,822 55,088 0 55,088 0 0 0 0 0 0

2008-09 0 0 0 50,000 0 50,000 0 22,714 32,374 0 32,374 0 0 0 0 0 0

2009-10 0 0 0 50,000 0 50,000 16,560 35,008 13,926 0 13,926 0 0 0 0 0 0

2010-11 50,000 38,319 0 61,681 11,681 50,000 51,975 65,901 0 0 0 27,084 0 27,084 0 0 0

2011-12 50,000 67,683 25,000 7,317 0 7,317 32,760 24,255 8,505 0 8,505 0 0 0 0 0 0

2012-13 50,000 0 7,317 50,000 0 50,000 40,301 26,511 22,295 0 22,295 0 0 0 0 0 0

15 For specific details about the rules around PSV please refer to the water sharing plan. 16 50,000 megalitres was borrowed from the EWA accounts and made available for consumptive use as part of the AWDs. 17 The Water Sharing Plan was suspended on 9 November 2006 and was not reinstated until 16 September 2011.



Table 19: Provisional storage volume account summaries 2004-05 to 2012-1318

Water Year

PSV1 PSV2

Credit 19 End of Year Forfeit

Carry Forward

Credit up to previous years forfeit20

Credit Not Alloc'd

EWA3 Prev. Year 21

Credit Nov-Dec EWA3

Forgone Trans 22

Credit 1 Nov 50% Unused

EWA3 23

Credit 1 Jan Remaining

EWA3 23

Balance End of Year Forfeit

Carry Forward

2004-05 0 0 0 0 0 0 0 0 0 0 0

2005-06 0 0 0 0 0 0 0 0 0 0 0

2006-07 0 0 0 0 0 0 0 0 0 0 0

2007-08 0 0 0 0 0 0 0 0 0 0 0

2008-09 0 0 0 0 0 0 0 0 0 0 0

2009-10 0 0 0 0 0 0 0 0 0 0 0

2010-11 200,000 200,000 0 0 0 27,084 0 27,084 54,168 54,168 0

2011-12 200,000 200,000 0 54,168 27,084 0 0 0 81,252 81,252 0

2012-13 200,000 200,000 0 0 0 0 0 0 0 0 0

18 For specific details about the rules around PSV please refer to the water sharing plan. 19 When general security AWD plus carryover volume exceeds 0.6 megalitres/share PSV1 receive 50,000 megalitres plus an additional 8,750 megalitres for every additional 0.01 megalitres/Share of AWD plus carryover volume in excess of 0.8 megalitres/share. 20 When general security AWD plus carryover volume exceeds 0.8 megalitres/share and requirements for EWA3 and PSV1 have been met any additional excess volume can be credited to PSV2 up to a limit of that water that was forfeited the previous year. 21 From 1 November when general security AWD plus carryover volume exceeds 0.8 megalitres/share the PSV2 account is credited up to a maximum limit of the sum of water not credited to EWA3 in the current year and any water that was not credited in the previous year. 22 Between 1 November and 31 December EWA3 is credited with 50% of forgone translucent releases when AWD plus carryover volume exceeds 0.8 megalitres/share. The PSV2 account is credited with the other 50%. 23 Water is moved from the EWA3 account to the PSV2 account 2 times each year. On the 1st November 50% of remaining account water is moved with any remaining account water moving on 1st January.



Table 20: Water delivered - planned environmental water held in Burrinjuck Dam 2004-05 to 2012-13

Water Year EWA1 Delivered EWA2 Delivered

Under Release Delivered 24

Planned Environmental Water Delivered 25

2004-05 0 0 0 0

2005-06 0 19,050 0 19,050

2006-07 26 0 0 0 0

2007-08 0 8,822 0 8,822

2008-09 0 22,714 0 22,714

2009-10 0 35,008 0 35,008

2010-11 38,319 65,901 89,798 194,018

2011-12 67,683 24,255 40,065 132,003

2012-13 0 26,511 2,843 29,354

Table 21: End of year balances for total EWA, DRB and translucency/transparency under release 2004 -05 to 2012-13

Year

Total EWA Carry Forward Balance

DRB Under Release 27

Increase Decrease End of Year Balance

Below Target

(Credit)

Above Target

(Debit) 24

Payed back from DRB28

Net Under Releases

End of Year Balance

2004-05 42,497 22,232 238 21,994 0 0 0 0

2005-06 96,607 15,091 8,879 28,206 26,328 0 26,328 26,328

2006-07 26 113,910 12,654 1,271 39,589 -26,328 0 0 0

2007-08 105,088 10,163 2,853 46,899 0 0 0 0

2008-09 82,374 25,479 911 71,466 0 0 0 0

2009-10 63,926 8,688 3,208 76,946 17,108 0 17,108 17,108

2010-11 50,000 33,000 11,097 98,849 72,690 89,798 0 0

2011-12 15,822 15,900 20,488 94,260 69,611 40,065 29,546 69,325

2012-13 72,295 9,956 96,193 7,875 25,059 2,843 87,886 3,655

24 Under Release water delivered to meet environmental requirements. 25 Total volume of water delivered for environmental purposes from planned environmental water provisions set aside in Burrinjuck Dam. It is the sum of EWA1 delivered, EWA2 delivered and Under Release delivered (does not include translucency/transparency releases). 26 The Water Sharing Plan was suspended on 9 November 2006 and was not reinstated until 16 September 2011. 27 Under Release is that water that was not delivered under the Translucent/transparent release rules in the Plan that will be paid back at a later date. The Under Release balance was zeroed once water sharing plan suspended. 28 DRB balance was zeroed on 4 August 2012 to balance the borrowed volume accumulated since 1 July 2004. The figure used to zero accounts was 87,886 and was calculated based on corrected historical calculations of under release. These historical corrections have been retrospectively applied in the table.



Note 10 - Snowy required annual release

Snowy Hydro Limited operates under a May to April accounting year which is different to the water accounting period being considered in this report. Hence this note will cover both the Snowy RAR and those adjusted to represent the reporting period.

Snowy Hydro Limited provides an annual fixed minimal accountable release, known as the Required Annual Release (RAR) to the Murrumbidgee (1,026,000 megalitres per year). However, in years of severe drought when the current inflow sequence is worse (drier) than the historical dry sequence, Snowy Hydro delivery of the RAR could put the Snowy Scheme at risk of running out of water. In those years the RAR may be reduced by the Dry Inflow Sequence Volume (DISV) being the measure of the cumulative difference between the historic dry sequence and the current inflow sequence. Any shortfall in the delivery of the DISV will be repaid in the future when annual inflows improve.

Further adjustments to the RAR can also be made each year as a result of pre-releases made in the previous year or for water savings in the Murrumbidgee that have been dedicated to Snowy River environmental flows. The RAR and those items that adjust it are monitored continually and updated whenever changes in the catchment dictate it.

The RAR delivered is assessed as Accountable Net Jounama Releases being the sum of:

• Actual Releases from Tumut 1 Power Station • Total Montane Release • Increase in storages at Talbingo and Jounama

Montane release is environmental water to support the high altitude streams that have been impacted by the Snowy Mountains Scheme. It is diverted to Burrinjuck Dam catchment with the majority lost before reaching the Dam (hence not separated out in statements for the Burrinjuck Dam inflows). Hence the figure used for the accountable portion of Blowering Dam inflows in the accounting statements excludes Montane releases.

Policy

Snowy Water Licence 2010

Data type


Data accuracy


Providing agency

NSW Office of Water

Data sources

Snowy Mountains Authority Water Operations Report

Methodology

Snowy Accounting Year (May – April)

RAR deliverable for Snowy–Tumut Development is calculated as being:

• Annual Fixed RAR • plus DISV as at 1 March (previous water year) • less Water savings Allocated to Snowy Tumut



• less Pre Release (previous water year)

The Adjusted RAR for Snowy–Tumut Development is calculated as being:

• RAR Deliverable • less DISV on 1 March (water year) • less Murrumbidgee Water Deal Paybacks • less RAR Permitted shortfalls and relaxations • less Snowy-Tumut Intervalley Transfer Settlement

Total RAR Delivered = Adjusted RAR plus Pre Release (next water year)

Reporting Period (July – June)

Delivered RAR = Sum Accountable Net Jounama Releases (July – June)

RAR Inflow to Blowering = Delivered RAR Less Montane release


The following tables provide detail into the calculation of the Snowy-Tumut RAR as well as the water delivered under RAR for the July-June water year.

Table 22: Snowy Tumut RAR summary table

Snowy-Tumut RAR 2012-13 Summary 1 May 2012 to 30 April 2013

Components Volume (ML) Annual Fixed RAR 1,026,000 Annual Allocation Water Savings 2011-12 (127,000) DISV 1 March 2012 0 Pre Releases for 2012-13 (55,000)

Total RAR 2012-13 844,000 Within Year Adjustments DISV 1 March 2013 0 Intervalley Transfer to Murray 0 Relaxation Volume Call Out from 2011-12 100,000 Snowy licence Shortfall Payback 39,000

Adjusted RAR Target Delivered 2012-13 983,000 Pre Release for 2013-14 200,000 Above Target Release 74,000

Total Snowy Volume Delivered 2012-13 1,257,000 Snowy-Tumut RAR Accounting to 1 July 2013

Components Volume (ML) Annual Fixed RAR 1,026,000 Annual Allocation Water Savings 2012-13 (137,000) DISV 1 March 2013 0 Pre Release for 2013-14 (200,000) Relaxation Volume 2013-14 0 Snowy licence Shortfall Payback 0

Total RAR 2013-14 (as at 1 May 2013) 689,000 DISV 1 July 2013 0

Estimate 2013-14 RAR (as at 1 July 2013) 689,000 RAR Delivered 1 May 2013 to 30 June 2013 (204,000)

Outstanding RAR to be Delivered (as at 1 July 2013) 485,000



Annual Snowy-Tumut RAR Delivery Summary 1 July 2011 to 30 June 2013

Component Volume (ML) 1 July 2011 to 30 June 2012 RAR Delivered 734,000 Montane release (59,000)

RAR Inflow to Blowering 675,000 1 July 2012 to 30 June 2013 RAR Delivered 1,313,000 Montane release (38,000)

RAR Inflow to Blowering 1,275,000



Note 11 - Prior year account adjustment

This is a line item that is used to correct balances in the accounts. The double entry accounting being applied is a continuous process whereby the closing balance of one year is the opening balance for the proceeding year. Occasionally corrections will be required for a variety of reasons including when an error is identified in prior year reporting or when a process that had previously been reported is unable to be supplied and the associated asset or liability must be removed to maintain the integrity of the statements. This is different to the unaccounted difference component which is a physical volume required to achieve mass balance after all the known processes have been accounted.

Data type

Calculated

Accuracy


Providing agency

NSW Office of Water.

Data source

Not applicable

Methodology

Adjustments were required to be applied to the closing allocation account balances on 30 June 2012, to ensure the balances presented in the 2011-12 GPWAR provide for the correct opening balances for the 2012-13 accounting. Required adjustments are due to account balances being modified or corrected in the water accounting system after the publication of the 2011-12 GPWAR.


Table 23: Prior year account adjustments summary

General Security Murrumbidgee

Irrigation (Conveyance)

Coleambally Irrigation

(Conveyance)

Domestic and Stock (Domestic) Total

Increase 0.1 0.1 0.2

Decrease 0.20 17,623.20 17623.4



Note 12 - Surface water storage

This is the actual volume of water stored in the individual surface water storages at the date of reporting. The volumes provided represent the total volume of water in the storage, including dead storage which is the volume of water which can’t be accessed under normal operating conditions e.g. volume below low level outlet. It is assumed that the dead storage can be accessed if required via alternative access methods e.g. syphons.

Data type


Policy

Not applicable

Data accuracy


Providing agency

NSW Office of Water

Data source

NSW Office of Water – HYDSTRA

Methodology

Storage volumes are calculated by processing a gauged storage elevation through a rating table that converts it to a volume.


The following table provides a breakdown of the storage capacities and dead storages.

Table 24: Capacity and dead storage summary table 2012-13

Name Capacity (ML) Dead storage (ML) 2012-13

% change (relative to total capacity)

Burrinjuck Dam 1,026,330 3,250 52▼

Blowering Dam 1,631,410 23,990 25▼

Berembed Weir 3,380 120 29▼

Gogeldrie Weir 7,400 200 6▼

Hay Weir 14,300 1,000 38▲

Maude Weir 4,920 300 32▲

Redbank Weir 5,500 400 24▼

Tombullen Storage 11,230 372 1▼

Total 2,704,470 29,632



Note 13 - River channel storage

The volume of water stored in the river channel on the day of reporting.

Policy

Not applicable

Data type


Data accuracy

B – Estimated in the range +/- 25%

Providing agency

NSW Office of Water

Data sources

NSW Office of Water: HYDSTRA, CAIRO

Methodology

For each river section S(n):

V = Q x T

The river channel storage will be equal to the sum of all river section volumes.

River channel storage = ∑ S(n) V

Table 25: Summary of river volume calculation components

Symbol Variable Data Source Unit

Q Average flow in the river section. Calculated by averaging the daily flows at the upstream and downstream river gauges.

HYDSTRA ML/d

V Volume in each river section. Calculated ML

T Average travel time for a parcel of water to travel through the river section. CAIRO days

Assumptions and approximations:

Travel times are estimated to the nearest day. Daily flow change between gauging sites assumed to be linear.




Table 26: Break down of river volume calculation on 30 June 2013

UPSTREAM DOWNSTREAM Average Flow (ML/D)

Travel Time (days)

Volume (ML) Site Flow (ML/d) Site Flow

(ML/d)

Tumut

Blowering Release + LacMalac

923 Brungle Bridge 1,203 1,063 1 1,063

Main River

Burrinjuck Release 1,906 Gundagai 3,397 2,652 2 5,303

Gundagai 3,397 Wagga 2,676 3,037 2 6,073

Wagga 2,676 U/S Berembed 2,140 2,408 2 4,816

Berembed Release 2,136 Narrandera 2,718 2,427 1 2,427

Narrandera 2,718 U/S Gogeldrie Weir 2,635 2,677 1 2,677

Gogeldrie Release 2,636 Darlington Point 2,050 2,343 1 2,343

Darlington Point 2,050 Carrathool 2,522 2,286 3 6,858

Carrathool 2,522 U/S Hay Weir 1,905 2,214 2 4,427

Hay Release 1,739 U/S Maude Weir 1,467 1,603 1 1,603

Maude Release 641 U/S Redbank 1,180 911 2 1,821

Redbank Release 1,491 Balranald 1,058 1,275 3 3,824

Yanco System

Yanco Offtake 337 Morundah 112 225 2 449

Morundah 112 Yanco Bridge 114 113 8 904

Yanco Bridge 114 Wirali 34 74 6 444

Wirali 34 Puckawidgee 273 154 2 307

Puckawidgee 273 Wanganella 296 285 3 854

Wanganella 296 Darlot 301 299 3 896

Darlot 301 U/S Moulamein 368 335 3 1,004

Columbo Creek

Columbo Ck Offtake 155 Coonong Weir 124 140 4 558

Coonong Weir 124 D/S Innes Bridge 217 171 3 512

D/S Innes Bridge 217 Jerilderie 291 254 3 762

Jerilderie 291 Hartwood Weir 273 282 6 1,692

Forest Creek

Forest Ck Offatke 4 Wariston Weir 0 2 4 8

Total Volume 51,622



Note 14 - Storage inflow

Storage inflow refers to the volume of water flowing into the major headwater storages - Burrinjuck and Blowering Dams or the off-river, reregulating storage of Tombullen. The storage inflow for Blowering Dam has been sub-categorised Snowy Accountable, Snowy Pre-release and Other/Natural.

Snowy accountable is inflow accredited against the Required Annual Release (RAR) from Snowy Hydro and pre-release is water that has been released on top of those requirements and will be accredited to the required annual release in the next season. Other/Natural includes natural runoff from the surrounding Blowering catchment, and any water released from Snowy that was not allowed to be accredited as RAR water. Further information on RAR is available in Note 10.

Policy

Not applicable

Data type


Data accuracy


Providing agency

NSW Office of Water

Data sources

NSW Office of Water: HYDSTRA, Integrated Quantity and Quality Model (IQQM), CAIRO

Methodology

For Blowering and Burrinjuck storages there is no direct measurement of inflows. However, it is possible to calculate inflows by using a mass balance approach (based on balancing the change in storage volume) where inflow is the only unknown. This is referred to a backcalculation of inflows. The backcalculation figures were derived using a one day time step with the inflow calculated according to the equation below. The daily inflows are then summed to provide an annual inflow figure.

I = ΔS + O + Se + ((E *Kp*A)-(R*A))/100

Table 27: Components for backcalculation of inflow Symbol Variable Unit

I Inflow ML/day ΔS Change in storage volume ML O Outflow ML/day Se Seepage ML/day R Rainfall mm/day E Evaporation mm/day

Kp Pan evaporation factor A Surface area - derived from height to surface areas lookup curve ha

Assumptions and approximations: • Constant storage specific pan evaporation factors are applied (one annual factor). • Seepage was assumed to be zero



For Tombullen storage, where inflows are regulated by diverting flow from the main river inflow is measured. The flows are obtained by measuring river heights at gauging stations along the river, and then passing these heights through a rating table that converts them to a daily flow volume. Inflow reported in this GPWAR was obtained directly from the river operations spreadsheet (CAIRO).



Note 15 - Storage evaporation and storage rainfall

For the major storages of Burrinjuck and Blowering, this refers to the water that is either lost as a result of evaporation, or gained as a result of rainfall. For Tombullen storage, only a net evaporation is presented which is an estimate of the combined effects of rainfall and evaporation on the storage.

Data type


Policy

Not applicable

Data accuracy

B – Estimated in the range +/- 25%

Providing agency

NSW Office of Water

Data source

NSW Office of Water – IQQM backcalculation, HYDSTRA, CAIRO

Methodology

Burrinjuck and Blowering storages

While the backcalculation methodology requires the effect of evaporation and rainfall on the storage to be calculated, it is currently output as a net evaporation figure. The ED AWAS 1 specifies that off-setting should be avoided and as such, a further calculation was required to split the net evaporation figure to rainfall and evaporation. This is achieved by first, outputting daily time-series of storage surface area from the backcalculation (which uses a height to area lookup curve as defined in HYDSTRA). Daily rainfall and evaporation data is then applied to the area time-series to achieve a volume in megalitres which is then aggregated to an annual figure. The rainfall and evaporation data utilised is equivalent to the data used in the storage inflow backcalculation, with the same pan factor applied to the evaporation data.

Rainfall: Volume (ML) = Rainfall (mm) x Area (m2) x 10-6

Evaporation: Volume (ML) = Pan Evaporation (mm) x Pan Factor x Area (m2) x 10-6

Table 28: Pan Factors utilised for evaporation calculation

Storage Pan factor applied

Burrinjuck 0.80

Blowering 0.85

Tombullen storage

For Tombullen a simple, annual mass balance was calculated for the storage, whereby the known components are inflow, volume, and outflow (measured data obtained from CAIRO). The volume required to achieve mass balance is therefore assumed to be the volume of net evaporation from the storage.

Net Evaporation = storage change (ML) + storage release (ML) – storage inflow (ML)



Note 16 - Gauged tributary inflow

The inflow into the regulated river that occurs downstream of the headwater storages that is measured at known gauging stations.

Policy

Not applicable

Data type

Measured data

Data accuracy


Providing agency

NSW Office of Water

Data sources

NSW Office of Water: HYDSTRA

Methodology

The flows are obtained by measuring river heights at gauging stations along the river, and then passing these heights through a rating table that converts them to a daily flow volume.


The total gauged inflow for 2012-13 is the sum of the inflows for the gauged tributaries defined in the table below.

Table 29: Summary of gauged inflow, 1 July 2012 to 30 June 201329

Station Station Name Area (km2) Volume (ML)

410057 Goobarragandra River at Lacmalac 673 218,670

410025 Jugiong Creek at Jugiong (Inverlockie) 2,120 41,501

410044 Muttama Creek at Coolac 1,025 13,859

410038 Adjungbilly Creek at Darbalara 391 40,632

410061 Adelong Creek at Batlow Road 144 20,010

410047 Tarcutta Creek at Old Borambola 1,660 78,159

410103 Houlaghans Creeks at downside 1,130 170

410048 Kyeamba Creek at Ladysmith 530 10,877

410043 Hillas Creek at Mount Adrah 568 10,160

410114 Killimicat Creek at Wyangle 23 1,156

410012 Billabong Creek at Cocketgedong 4,660 42,309

- Finley Escape (Murrumbidgee Irrigation Limited) N/A 17,176

TOTAL 494,679

29 Figures corrected September 2014



Note 17 - Ungauged runoff estimate

The inflow into the river that occurs downstream of the headwater storages that is not measured.

Policy

Not applicable

Data type

Estimated

Data accuracy

C – Estimated in the range +/- 50%

Providing agency

NSW Office of Water

Data sources

NSW Office of Water, State Water: CAIRO

Methodology

Ungauged inflow is a very difficult component to estimate with such large volumes of water flowing through the catchment in 2012-13. To derive an estimate a simple mass balance approach was adopted whereby known inflows and outflows were combined with an assumed loss factor. No estimate was made for the area below Narrandera or the Yanco Creek system and aquifer interaction has been excluded from the calculation.

UInflow = GNarrandera - RBurrinjuck - RBlowering – GInflow + UNarrandera + Lestimate

Where:

UInflow = Ungauged Inflow to Narrandera (excluding Yanco Creek system)

GNarrandera = Gauged flow at Murrumbidgee River at Narrandera 1 July 2012 to 30 June 2013

RBurrinjuck = Total release from Burrinjuck Storage 1 July 2012 to 30 June 2013

RBlowering = Total release from Blowering Storage 1 July 2012 to 30 June 2013

GInflow = Total gauged inflow to Narrandera 1 July 2012 to 30 June 2013 (excluding Yanco system)

UNarrandera = Total extractions to Narrandera 1 July 2012 to 30 June 2013 (excluding Yanco system extractions)

Lestimate = Estimate of losses in target reach. Assumed to be 10 per cent of water all water entering.



Note 18 - River evaporation and river rainfall

This refers to the volume of water effective on the accounted river reach that is either lost as a result of evaporation, or gained as a result of rainfall.

Data type


Policy

NA

Data accuracy

B - Estimated in the range +/- 25%

Providing agency

NSW Office of Water

Data source

NSW Office of Water: HYDSTRA, ARCGIS

QLD Department of Natural Resources: SILO

Methodology

The volume applied for evaporation and rainfall on the regulated river is achieved by first calculating a daily time-series of river area. This is achieved by breaking the river up into reaches and utilising the cross sections recorded at river gauging locations to determine the average width of the river with a given daily flow. River length is then determined between two gauging locations using ARCGIS and as such an area for each reach can be defined.

Area (m2) = Average W (m) x L (m)

Where W is the daily width determined from the gauging cross sections and L is the length as determined through ARCGIS analysis.

With daily area determined, various climate stations are then selected based on their proximity to each river reach. Rainfall and evaporation data is then extracted from SILO and applied to the area time-series to achieve a volume in megalitres which is then aggregated to an annual figure.

Rainfall

Volume (ML) = Rainfall (mm) x Area (m2) x 10-6

Evaporation

Volume (ML) = ET0 (mm) x Kc x Area (m2) x 10-6

Where:

ET0 = reference evapotranspiration from SILO

Kc = crop factor for open water (1.05)



Note 19 - Return flows (including re-credit)

Return flow is that flow that has left the river and return back further downstream. The returning flow is less than what leaves the river. It can also include return flows from catchment drains within the irrigation corporation areas.

In certain circumstances in the Murrumbidgee water is delivered through Coleambally Irrigation catchment drains in order to meet demand in Yanco Creek system during peak flow periods. In these circumstances the return flow provided through Coleambally Irrigation will be accountable and is credited back to the appropriate allocation account. All other return from drainage is non accountable.

Re-credits are also given to Coleambally Irrigation for any flow diverted to Tombullen storage, a re-regulating storage beside the Murrumbidgee River, whereby water is diverted to the storage via the Coleambally main canal.

Data type

Measured

Policy

NA

Data accuracy

Return flow - A - Estimated in the range +/- 10%

Recredit – A1 – Nil accuracy

Providing agency

NSW Office of Water

Data sources

Murrumbidgee Irrigation Licence Compliance Report

Coleambally Irrigation Annual Compliance Report

Methodology

The return flows are measured in the same way as the gauged inflows, that is by measuring river heights at gauging stations along the river, passing these heights through a rating table that converts them to a flow. The gauges in question are owned by the irrigation corporations and hence flow data is derived and assessed by them. The total return flow is the sum of the flows for all the return flow gauges.




Table 30: Return flow summary table Coleambally Irrigation Murrumbidgee Irrigation

Year Accountable Non Accountable Total Non Accountable 2004-05 1,415 28,385 29,800 5,663 2005-06 11,339 33,148 44,487 8,570 2006-07 0 10,487 10,487 945 2007-08 1,777 12,936 14,713 337 2008-09 0 9,277 9,277 197 2009-10 619 12,802 13,421 598 2010-11 400 41,307 41,707 5,905 2011-12 75,794 71,328 147,12230 5,85231 2012-13 73,792 16,253 90,092 2,563

Figure 25: Conceptual diagram for Coleambally Irrigation re-credits

30 Tombullen storage has been represented differently in this GPWAR to previous reports whereby it is now accounted as an independent storage with inflows and outflows. Tombullen is a re-regulating storage and the inflow is achieved by diverting water initially down the Coleambally main canal. All water going down the main canal is firstly registered as usage against the Coleambally licence and a result all water diverted for Tombullen is recredited back to Coleambally Irrigation. This table has been updated to reflect the Tombullen recredit for 2012-13 and the comparative year 2011-12. In other years, whereby the storage was being accounted as a simple change in storage volume, the recredits for Tombullen are excluded. 31 The return flow was incorrectly reported as 28,376 in the Murrumbidgee 2011-12 GPWAR. This figure has been corrected in the statements, which also meant an adjustment to the unaccounted difference for 2011-12 was also required.



Note 20 - Dam releases, river inflow from dam releases

The volume of water released from Burrinjuck and Blowering Dams, and Tombullen off River Storage to meet downstream requirements. Releases for Burrinjuck have been sub-classified into Translucent, Transparent or other (the remaining) releases. In the accounting process releases have been represented as both a decrease in asset (of the dams) and an equal increase in asset (the river).

Policy

Not applicable

Data type

Measured data

Data accuracy


Providing agency

NSW Office of Water

Data sources

NSW Office of Water - HYDSTRA

State Water – Daily Environmental Operational Spreadsheet

Methodology

The flows are obtained by measuring river heights at a gauging station downstream of the dam wall, and then passing these heights through a rating table that converts them to a daily flow volume. The gauges used were 410102 (Tumut River at Blowering Dam) and 410008 Murrumbidgee River at D/S Burrinjuck Dam. The total Burrinjuck release was disaggregated using daily operational spreadsheet tags of transparent and translucent releases.


Table 31: Summary of releases, 1 July 2012 to 30 June 2013 (ML)

Storage Type Release (ML) Total Release (ML) Total increase to river (ML)

Burrinjuck Dam Translucent 127,526

1,234,637

3,326,235

Transparent 63,192

Other 1,043,919

Blowering Dam Total release 2,041,522 2,041,522

Tombullen Total release 50,076 50,076



Figure 26: Daily releases from Burrinjuck and Blowering storages 2012-13

0

5,000

10,000

15,000

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Rele

ase

(ML/

d)

Burrinjuck Releases Blowering Releases

Figure 27: Daily releases from Tombullen storage 2012-13

0

300

600

900

1,200

1,500

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Rele

ase

(ML/

d)



Note 21 - End of system flow

This refers to flow that leaves the entity and does not return.

Data type


Policy

Not applicable

Data accuracy


Providing agency

NSW Office of Water

Data source


Methodology

Summation of flows at gauging station/s measuring the volume of water that leaves the entity. For the Murrumbidgee reporting entity this is represented by the following gauges:

• 410134 Billabong Creek at Darlot • 410003 Murrumbidgee River at Balranald

These gauges record the time series of heights which are converted to a volume of water based on a derived ‘height to flow’ relationship (rating table).

Under the water sharing plan minimum flow targets also exist at these end of system gauges


The minimum flow target flows at both Balranald (varies throughout the year) and Darlot (50 megalitres per day) were considered to be achieved throughout 2012-13. There was a period during January 2013 where the flow at Darlot dropped below the minimum requirement for approximately 5 days, however this was considered to be within allowances for the practicality of operating a constantly varying river system against fixed flow limits.

The following graphs provide details of the daily flows in comparisons to both the minimum flow targets and the required flow targets. The required flow targets are made up of the minimum targets plus any other downstream requirements such as demand, environmental water requirements or inter-valley trade delivery requirements.



Figure 28: Billabong Creek at Darlot flow and target

0

200

400

600

800

1,000

1,200

1,400

1,600

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Flow

(ML/

d)

Required flow targetObserved flowMinimum flow target

Figure 29: Billabong Creek at Darlot flow and target (truncated at 500 ML/d)

0

100

200

300

400

500

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Flow

(ML/

d)

Required flow target Observed flow Minimum flow target

Figure 30: Murrumbidgee River at Balranald flow and target

0

5,000

10,000

15,000

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Flow

(ML/

d)

Required Flow Target Observed Flow Minimum Flow Target



Figure 31: Murrumbidgee River at Balranald flow and target (truncated at 6,000 ML/d)

0

1,000

2,000

3,000

4,000

5,000

6,000

1-Ju

l-12

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Flow

(ML/

d)

Required Flow Target Observed Flow Minimum Flow Target



Note 22 - Diversions to Lowbidgee

The Lowbidgee is the largest area of floodplain wetland remaining in the Murrumbidgee catchment. It is located between Maude and Balranald and covers an area over 2,000 square kilometres. The Lowbidgee includes the second largest red gum forest in Australia and significant black box, lignum and reed-bed communities. The lower Murrumbidgee floodplain wetlands have a strategic role in the health of the Murray-Darling river system, and are significant at a national and international level.

Data type

Measured

Policy


Part 12 System operation rules

- Clause 69 Flows in the Lowbidgee Flood Control and Irrigation District

Available from NSW Office of Water website at www.water.nsw.gov.au

Data accuracy


Providing agency

NSW Office of Water

Data source


State Water Corporation – CAIRO

Methodology

The total diversion to Lowbidgee is calculated by summing the flows diverted down three canals off Maude Weir and four Regulators off Redbank Weir. The table below provides a description of these and the method for assessing the flow at each site.

Table 32: Lowbidgee diversion measurement sites and methods of assessment

Site No. Site name Method Diversions (ML)

Maude Weir Diversion

410060 Nimmie Canal Measuring river heights then passing these heights through a rating table that converts them to a flow. 63,652

410175 North Caira Canal

Measuring river heights then passing these heights through a rating table that converts them to a flow. 62,597

410173 South Caira Canal

Measuring river heights then passing these heights through a rating table that converts them to a flow. 61,743

Redbank Weir Diversion

- Glen Dee Estimated by from Operator 33,198

- Juanbung Estimated by from Operator

41000246 Yanga Gauge closed – No data for 2012-13 NA

41000240 Waugorah Gauge closed – No data for 2012-13 NA





Figure 32: Total diversions to the Lowbidgee 2012-131

0

300

600

900

1,200

1,500

1,800

2,100

2,400

2,700

3,0001-

Jul-1

2

1-Au

g-12

1-Se

p-12

1-O

ct-1

2

1-N

ov-1

2

1-De

c-12

1-Ja

n-13

1-Fe

b-13

1-M

ar-1

3

1-Ap

r-13

1-M

ay-1

3

1-Ju

n-13

1-Ju

l-13

Rele

ase

(ML/

d)



Note 23 - Extractions from river

For surface water this refers to the actual volume of water directly pumped or diverted from the regulated river by licence holders. Occasionally (generally in the case of environmental water) volumes are ordered against a licence account for in-stream benefits or for end of system flow events. As such the volume reported to be physically extracted from the river will not always be equal to the amount of water debited to accounts for usage, which has been reported in detail in Note 3. The figure also excludes basic rights extractions, which is reported as a separate line item and detailed in Note 24.

Data type

Measured data

Policy

Not applicable

Data accuracy


Providing agency

NSW Office of Water

Data source


NSW Office of Water – Water Ordering and Usage database

Methodology

For the purposes of this GPWAR extraction from the river is considered to be the total volume metered and debited to the allocation accounts minus any water that can be identified as being used within the system, or ordered to be passed through the system. These volumes are generally associated with environmental water orders and have already been accounted for in other line items. Extractions from river included that diverted to an irrigation corporation for distribution.


Table 33: Reconciliation of physical extraction to account usage Volume (ML) Licenced Extractions from River 32 2,176,459

plus Licenced Flow Leaving System 33 92,546 plus In stream licenced usage 34 168,000

plus minus licenced enviro water leaving accounting

6,204

equals Total Account usage 35 2,443,209

32 Estimate of direct licenced extractions from the river including uncontrolled flow extractions but excluding basic rights usage. 33 Licenced water ordered to leave the accounted Murrumbidgee extent (licenced water to Lowbidgee). 34 Water ordered and used within the system (not extracted from the river. 35 The total amount of water accounted for usage against the allocation accounts.



Note 24 - Basic rights extractions

This is the non-licensed right to extract water to meet basic requirements for household purposes (non-commercial uses in and around the house and garden) and for watering of stock. It is available for anyone who has access to river frontage on their property.

This water cannot be used for irrigating crops or garden produce that will be sold or bartered, for washing down machinery sheds or for intensive livestock operations.

In times of limited supply, there may be restrictions on taking water for domestic and stock use.

Data Type

Estimated

Policy


Part 4 Basic Landholder Rights o Clause 18 Domestic and stock rights


Data accuracy

C – Estimated in the range +/- 50%

Providing agency

NSW Office of Water

Data source


Methodology

The estimation of domestic and stock rights uses a series of estimates for water usage, stocking rates, population and property shape based on local knowledge to calculate riparian (stock and domestic) requirements in megalitres per year. The annual extraction for Domestic and Stock rights in the water accounts is assumed to be the estimated figure stated in the Water Sharing Plan for the Murrumbidgee Regulated River Water Source 2003 (4,560 megalitres).




Note 25 - Unaccounted volume

In theory, if all the processes of a water balance were accurately accounted for the unaccounted difference would be zero. In reality due to the large accuracy uncertainties in many of the volumes presented in the accounts, the various sources and methods from which the data has been obtained and the fact that not all processes of the water cycle have been accounted for in detail, the statements are not balanced at the end of the accounting process. In order to balance the accounts a final balancing entry is required, and this is termed the unaccounted difference. As technology progresses and accuracy improves in the account estimates, it is anticipated that relatively, this figure should reduce in future accounts.

Data type

Not applicable

Policy

Not applicable

Data accuracy

D – Estimated in the range +/- 100% (this refers to the fact the unaccounted volume is a result of a range of processes estimated using different methodologies and accuracies. The accuracy around the number itself, that is required to achieve mass balances is A1 – Nil accuracy).

Providing agency

Not applicable

Data source

Not applicable

Methodology

The unaccounted difference is equal to the amount required to obtain the correct physical volume in river at the end of the reporting period, after all the known physical inflows and outflows have been accounted. The accounting process of this GPWAR attempted to represent the physical movement of water by creating a river asset. The opening and closing balance of the river volume was estimated according to Note 13.

Surface Water Unaccounted difference

UVSW = Rs – Rc + Ri - Ro

Where:

UVSW = Unaccounted difference for Surface Water

Rs = Opening river volume estimate

Rc = Closing river volume estimate

Ro = Physical outflows from the river (e.g. extractions)

Ri = Physical inflows to the river (e.g. runoff, return flows, dam releases)



Note 26 – River and groundwater interaction

This note refers to the net effect of water that has been identified as either flowing from the connected alluvium to the accounted river extent (increase in water asset), and from the accounted river extent to the alluvium aquifer (decrease in water asset).

Data type

Modelled

Policy

Not applicable

Data accuracy

D – Estimated in the range +/- 100%

Providing agency

NSW Office of Water

Data source

NSW Office of Water MODFLOW (Mid Murrumbidgee), Water Table Fluctuation Model (Lower Murrumbidgee). Data inputs to the models are obtained from HYDSTRA, GDS

Methodology

The river interaction methods used to produce estimates in this GPWAR are documented in the report, General Purpose Water Accounting Reports: Groundwater methodologies. This document is available for download from the NSW Office of Water webpage.

Method A (Modflow) was used to assess the annual physical groundwater budget in the Mid Murrumbidgee Groundwater Management Area, while Method B (a groundwater fluctuation method) was selected to determine interactions for the Lower Murrumbidgee groundwater management area (previous GPWAR’s have used a MODFLOW for this area, however the verification of the results since publication, against monitoring bore data indicated the model is not suitable for providing short-term/annual estimates, and as such was replaced with the water table fluctuation method). Due to the limitations in the data and methods applied for determining river interactions, only a net figure (river outflow to aquifer) has been presented.

No estimate is included in the statements for any river interactions outside the areas covered by these methods. The spatial extent of each area applied can be viewed in Figure 37 of Appendix 1.



Appendix 1 - Groundwater



Groundwater management Groundwater management for the area bounded by the Murrumbidgee surface water catchment is covered by 7 Water Sharing Plans and all or part of 15 of the groundwater sources within these plans that are detailed in Table 34 below. The Water Sharing Plans provide long term average annual extraction limits for each water source within the plans which determine the maximum volume of water that may be extracted under access licences and pursuant to domestic and stock rights and native title rights from each groundwater source on a long-term average annual basis.

Groundwater sources often cross multiple surface water catchment areas and hence only part of them reside in the Murrumbidgee. The percentage within can be seen in Table 35.

Table 34: Murrumbidgee groundwater Water Sharing Plan summary

Water Sharing Plan Water Sources applicable for the Murrumbidgee Catchment Date Commenced Date applicable to

Water Sharing Plan for the Lower Murrumbidgee Groundwater Sources

2003

Lower Murrumbidgee Shallow 1 October 2006 30 June 2017

Lower Murrumbidgee Deep

Water Sharing Plan for the Murrumbidgee Unregulated and

Alluvial Sources 2012

Billabong Creek Alluvial 4 October 2012 1 July 2023

Gundagai Alluvial

Kyeamba Alluvial

Wagga Wagga Alluvial

Water Sharing Plan for the New South Wales Murray Darling Fractured Rock

Groundwater Sources 2011

Lachlan Fold Belt 16 January 2012 1 July 2022

Yass Catchment

Young Granite

Water Sharing Plan for the New South Wales Murray Darling Basin Porous

Rock 2011

Western Murray Porous Rock 16 January 2012 1 July 2022

Oaklands Basin

Water Sharing Plan for the Murray Unregulated and Alluvial Groundwater

Sources 2011

Upper Murray 30 January 2012 1 July 2022

Water Sharing Plan for the Lower Murray Shallow Groundwater Source

2012

Lower Murray Shallow 1 April 2012 1 July 2022

Water Sharing Plan for the Lower Murray Groundwater Source

Lower Murray 1 November 2006 30 June 2017

A geographical representation of the areas covered by each of the water sharing plans can be seen in Figure 33 below. This shows that a number of groundwater water sharing plans overlay the same surface area due to the varying depths of the aquifers within the catchment.



Figure 33: Murrumbidgee surface water catchment – groundwater Water Sharing Plans



Groundwater availability All groundwater licences in the Murrumbidgee were granted an equivalent allocation of 1 megalitres per share, with the exception of Supplementary access licence in the Lower Murrumbidgee Deep Groundwater Source which received an available water determination of 0.3 megalitres per share and the Lower Murray Groundwater Source which received 0.6 megalitres per share. Under the terms set out in the Water Sharing Plan for the Lower Murrumbidgee Groundwater Sources and the Water Sharing Plan for the Lower Murray Groundwater Source the available water determination for supplementary licences is reduced each year by 0.1 megalitres, and 0.2 megalitres per share respectively, with the announcements for both set to be zero from the 2015-16 season onwards. The purpose of this licence category was to reduce entitlements to a sustainable level over time allowing affected users to adapt to these changes.



Table 35: Murrumbidgee surface water catchment groundwater sources summary table: page 1 of 2

Groundwater Source Long Term Annual

Extraction Limit (ML/Year)

Licence Category36 Share % of Share Component Announced

Water Source % within

Murrumbidgee Surface Water Catchment

Metered Usage 2012-13

(total water source)

Water Sharing Plan for the Murrumbidgee Unregulated and Alluvial Sources

Billabong Creek Alluvial 7,500

Domestic and Stock Rights 635 NA

100 1,333 Local Water Utility 1,505 100 Aquifer 3,867 100 Salinity and Water Table Management 1,500 100

Gundagai Alluvial 1,926


100 377 Local Water Utility 100 100 Aquifer 1,957 100 Aquifer (High Security) 1,955 100

Kyeamba Alluvial 723 Domestic and Stock Rights 12 NA

100 181 Aquifer 2,070 100

Wagga Wagga Alluvial 20,648 Domestic and Stock Rights 135 NA

100 15,560 (Detailed flow

budget diagram provided in this document)

Local Water Utility 20,200 100 Aquifer 8,384 100

Mid Murrumbidgee Zone 3 30,176


100 Domestic and Stock 120 100 Local Water Utility 4,912 100 Aquifer 43,351 100

Water Sharing Plan for the New South Wales Murray Darling Fractured Rock Groundwater Sources

Lachlan Fold Belt 821,250

Domestic and Stock Rights 74,311 NA

21

5,088 Local Water Utility 5,101 100 Aquifer 68,498 100 Salinity and Water Table Management 236 100

Yass Catchment 26,163 Domestic and Stock Rights 1,153 NA

100 0 Local Water Utility 279 100 Aquifer 2,925 100

Young Granite 9,529 Domestic and Stock Rights 759 NA

33 1,145 Local Water Utility 38 100 Aquifer 6,316 100

36 Domestic and Stock Rights are not a licenced entitlement and therefore do not have an allocation announcement associated with them. The value in the table is that specified in the water sharing

plans for each of the water sources.



Table 36: Murrumbidgee surface water catchment groundwater sources summary table: page 2 of 2

Groundwater Source Long Term Annual

Extraction Limit (ML/Year)

Licence Category37 Share % of Share

Component Announced

Water Source % within

Murrumbidgee Surface Water

Catchment

Metered Usage 2012-13

(total water source)

Water Sharing Plan for the New South Wales Lower Murray Groundwater Sources

Lower Murray 83,700


22 54,650 Local Water Utility 79 100 Aquifer 83,580 100 Supplementary Water 48,480 80

Water Sharing Plan for the New South Wales Lower Murray Shallow Groundwater Sources

Lower Murray Shallow 81,893


22 1,275 Local Water Utility 0 100 Aquifer 60,905 100 Salinity and Water Table Management 20,000 100

Water Sharing Plan for the New South Wales Murray Unregulated and Alluvial Sources

Upper Murray 14,109 Domestic and Stock Rights 402 100

23 11,889 Local Water Utility 151 100 Aquifer 41,125 100

Water Sharing Plan for the New South Wales Murray Darling Porous Rock Groundwater Sources Oaklands Basin 0 Domestic and Stock Rights 0 NA 100 NA

Western Murray Porous Rock 530,486 Domestic and Stock Rights 26,747 NA

<1%

8,238 Aquifer 21,780 100 Salinity and Water Table Management 14,582 100

Water Sharing Plan for the Lower Murrumbidgee Groundwater Sources 2003

Lower Murrumbidgee Shallow 10,000 Domestic and Stock Rights 3,000 NA

80

180,836 (Detailed flow

budget diagram provided in this

document)

Aquifer 5,201 100

Lower Murrumbidgee Deep 270,000


80

Domestic and Stock (Stock) 324 100 Local Water Utility 2,210 100 Aquifer 267,777 100 Aquifer (Community and Education) 3 100 Aquifer (Town Water Supply) 20 100 Supplementary 41,196 40

37 Domestic and Stock Rights are not a licenced entitlement and therefore do not have an allocation announcement associated with them. The value in the table is that specified in the water sharing

plans for each of the water sources.



Groundwater account summaries Table 38 and Table 39 below refer to the volume held in the groundwater allocation accounts at the time of reporting for those groundwater sources where sufficient accounting information is available. They also provide detail of the various processes that occur to either increase or decrease an allocation account throughout the water year.

The volume of water that is in the licence allocation accounts at the time of reporting is a net balance for the relevant licence category and represents that water that can be carried forward to the next water year as dictated by the carryover rules in place for that year or required under the water sharing plan.

A negative number for the carryover figure indicates that more usage has occurred than has been allocated to the account, and the deficit must be carried forward to the next season.

Table 37: Explanatory information for groundwater allocation account summary

Heading Description

Share This is the total volume of entitlement in the specific licence category.


AWD

The total annual volume of water added to the allocation account as a result of allocation assessments.

Licences New Increased in account water as a result of the issuing of a new licence.

Cancelled Decrease in account water as a result of a licence cancellation.



Account Usage Volume of water that is debited against the allocation accounts and is accountable against the licence.

Available Balance That part of the remaining account balance that is available to be taken at the conclusion of the water year.

Non Available Balance That part of the remaining account balance that is not available to be taken at the conclusion of the water year.





Table 38: Lower Murrumbidgee shallow groundwater source account summary 2012-13

Licence Category Share 30 June 2013

Opening Balance AWD Licences

cancelled

Assignments Account

usage

During Year

Forfeit

End of Year Balance End of year

forfeit

Carry Forward In Out Available Non

Available

Aquifer 5,201 9,589 5,201 0 0 0 2,252 0 8,100 4,436 2,785 9,752

Table 39: Lower Murrumbidgee deep groundwater source account summary 2012-13

Licence Category Share 30 June 2012

Opening Balance AWD Licences

cancelled

Assignments Account Usage

During Year

Forfeit

End of Year Balance End of year

forfeit

Carry Forward In Out Available Non

Available

Aquifer 267,777 429,081 267,777 0 32,957 32,957 166,917 0 352,833 177,108 96,475 433,466

Aquifer [Community and Education] 23 0 8 0 0 0 3 0 5 0 0 5

Aquifer [Town Water Supply] 20 0 20 0 0 0 3 0 18 0 18 0

Domestic and Stock [Stock] 324 0 324 0 0 0 0 0 324 0 324 0

Local Water Utility 2,210 0 2,210 0 0 0 822 0 1,388 0 1,393 -5

Supplementary Water 41,196 0 12,359 0 0 0 10,839 0 1,520 0 1,520 0



Table 40: Lower Murrumbidgee groundwater sources allocation assignment (trading) summary 2012-13

License Category

TRADE TO

Total Trade From Deep Groundwater Source

Aquifer

TRAD

E FR

OM

Deep Groundwater Source Aquifer 32,957 32,957

Total Trade To 32,957 32,957

Figure 34: Lower Murrumbidgee groundwater sources water availability summary 2012-1338

0

50

100

150

200

250

300

2006-2007 2007-2008 2008-2009 2009-2010 2010-2011 2011-2012 2012-13

Wat

er A

vaila

bilit

y (%

of E

ntitl

emen

t)

Aquifer Aquifer [Community and Education] Domestic and Stock [Stock]Local Water utility Supplementary Water Aquifer [Town Water Supply]

38 Water availability % of entitlement data was combined for the Shallow and Deep Lower Murrumbidgee Groundwater Sources.

The share component for Aquifer (Town Water Supply) did not exist prior to 2009-10. The share component for Aquifer

(Community and Education) did not exist prior to 2010-11. Water held in accounts prior to the commencement of the water

sharing plan was allowed to be carried forward in 2006-07 to aquifer licences.



Figure 35: Lower Murrumbidgee Shallow Groundwater Source usage

0

500

1,000

1,500

2,000

2,500

3,000

3,500

4,000

4,500

2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Usa

ge (M

L)

Figure 36: Lower Murrumbidgee Deep Groundwater Source usage

0

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

2006-07 2007-08 2008-09 2009-10 2010-11 2011-12 2012-13

Usa

ge (M

L)



Groundwater flows

The following section provides information on physical groundwater flows. For the Lower Murrumbidgee Groundwater Management Area and Mid Murrumbidgee Alluvial detailed water budgets are provided, produced by the NSW Office of Water groundwater accounting methods. Change in groundwater levels for 2012-13, estimated from the contouring of monitoring bore data are also available for these areas.

For the remaining areas, where no planning model is available, and there is insufficient monitoring bore data to estimate a complete budget, the NSW Office of Water’s used the soil water budget accounting method (Method C) to estimate a potential recharge for 2012-13. This method uses daily grided physical and climatic information to estimate a recharge via a basic book keeping technique that tracks the balance between the inflow of water from precipitation and the outflow of water by evapotranspiration, stream flow and drainage (potential groundwater recharge). This method was also used to provide a historic estimate for relative comparisons (see Figure 46). This indicates that potential recharge was relatively low in 2012-13, and the second consecutive season of below average recharge.

A detailed description of this method is available in ‘General Purpose Water Accounting Reports - Groundwater methodologies’ (referred to as method C) and can be accessed via the NSW Office of Water website, while the methodology used for a particular area can be viewed in Figure 37.

It is important to note that the data presented is modelled data and hence its quality can not be guaranteed. Care should be taken if using this data outside the context of this report.

Figure 37: NSW Office of Water groundwater methodologies implemented to prepare physical groundwater data



Figure 38: 2012-13 Lower Murrumbidgee physical flow budget

Figure 39: Lower Murrumbidgee groundwater management area, upper aquifer and change in groundwater levels 2012-13 (based on monitoring bore data)



Figure 40: Lower Murrumbidgee groundwater management area, lower aquifer and change in groundwater levels 2012-13 (based on monitoring bore data)

Figure 41: 2012-13 Mid Murrumbidgee Zone 2 physical flow budget



Figure 42: 2012-13 Mid Murrumbidgee Zone 3 physical flow budget

Figure 43: Mid Murrumbidgee groundwater management area, upper aquifer and change in groundwater levels 2012-13 (based on monitoring bore data)



Figure 44: Mid Murrumbidgee groundwater management area, lower aquifer and change in groundwater levels 2012-13 (based on monitoring bore data)

Figure 45: Potential recharge 2012-13 deviation from the long term mean, non-modelled areas

Refer to Physical Flow Diagrams



Figure 46: Murrumbidgee catchment, non-modelled areas annual potential recharge (1971-72 to 2012-13)

0

1,000,000

2,000,000

3,000,000

4,000,000

5,000,000

1971

-197

2

1973

-197

4

1975

-197

6

1977

-197

8

1979

-198

0

1981

-198

2

1983

-198

4

1985

-198

6

1987

-198

8

1989

-199

0

1991

-199

2

1993

-199

4

1995

-199

6

1997

-199

8

1999

-200

0

2001

-200

2

2003

-200

4

2005

-200

6

2007

-200

8

2009

-201

0

2011

-201

2

1971/72-2011/12 Potential Recharge 2012-13 Potential Recharge Mean

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