Border Rivers Catchment
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General Purpose Water Accounting Report 2010-2011 Border Rivers Catchment www.water.nsw.gov.au Publisher NSW Department of Primary Industries, Office of Water. Level 18, 227 Elizabeth Street GPO Box 3889 Sydney NSW 2001 T 02 8281 7777 F 02 8281 7799 [email protected] www.water.nsw.gov.au The NSW Office of Water manages the policy and regulatory frameworks for the state’s surface water and groundwater resources, to provide a secure and sustainable water supply for all users. It also supports water utilities in the provision of water and sewerage services throughout New South Wales. General Purpose Water Accounting Report 2010 -2011 – Border Rivers Catchment June 2012 ISBN 978 1 74256 313 8 Acknowledgment Soil data for groundwater methodologies provided by the Natural Resources Data Programs (soils) unit of the former NSW Department of Environment, Climate Change and Water. This report may be cited as: Burrell M., Moss P., Green D., Ali A., Petrovic J., Nguyen K. (2012) General Purpose Water Accounting Report 2010-2011: Border Rivers Catchment, NSW Department of Primary Industries, Sydney Cover photo: Boobera Lagoon - Photo courtesy of MDBA, Arthur Mostead. © State of New South Wales through the NSW Department of Trade and Investment, Regional Infrastructure and Services, 2012 This material may be reproduced in whole or in part for educational and non-commercial use, providing the meaning is unchanged and its source, publisher and authorship are clearly and correctly acknowledged. Disclaimer: While every reasonable effort has been made to ensure that this document is correct at the time of publication, the State of New South Wales, its agents and employees, disclaim any and all liability to any person in respect of anything or the consequences of anything done or omitted to be done in reliance upon the whole or any part of this document. NOW 12_261 i | NSW Office of Water, July 2012 Background Water accounting across Australia is undergoing major reform resulting from agreements reached under the National Water Initiative which recognises the need for a standardised, cohesive and comparable approach for water accounting and reporting. A review undertaken in 2006 found that the then current water reporting was being developed in an ad-hoc fashion and recommended the need for total accounting reform whereby water accounting would be developed as a discipline comparable to that of financial accounting. In line with this recommendation the Water Accounting Standards Board (WASB) was formed with the task of implementing a national standard for water accounting. This process has resulted in the production of the ‘Exposure Draft of Australian Water Accounting Standards 1 (ED AWAS 1)’ which defines the structure for preparing a ‘General Purpose Water Accounting Report’ (GPWAR)’, and following a consultation and review phase will transition to the Australian Water Accounting Standard (AWAS) . This document is a GPWAR for the regulated component of the NSW Border Rivers, prepared by the NSW Office of Water under the ED AWAS 1 framework. It has been prepared for the reporting period of 1 July to 2010 to 30 June 2011 and aims to provide a consolidated and informative summary of the water resource and water management that occurred within the valley for this period. A General Purpose Water Accounting Report prepared in accordance with the ED AWAS 1 contains: A contextual statement detailing the climate and water management in place for the reporting period A statement of Water Assets and Water Liabilities A statement of Change in Water Assets and Water Liabilities A statement of Physical Water Flows Disclosures/Notes – A section of notes referenced to line items within the above statements that explain in detail the source of the data, how the number was derived and the expected uncertainty associated with the number. This section also contains reconciliation statements required by the ED AWAS 1 An assurance statement An accountability statement ii | NSW Office of Water, July 2012 Table of Contents Background...........................................................................................................................................ii Contextual Statement.......................................................................................................................... 1 1.1 Introduction ............................................................................................................................ 2 1.2 Border Rivers catchment........................................................................................................ 2 1.3 Geographic boundaries of the Border Rivers reporting entity................................................ 2 Surface water ......................................................................................................................... 2 Groundwater .......................................................................................................................... 5 1.4 Climate ................................................................................................................................... 5 1.5 Dam inflows............................................................................................................................ 9 1.6 Major flow events ................................................................................................................. 11 1.7 Policy.................................................................................................................................... 12 Surface water ....................................................................................................................... 12 Groundwater ........................................................................................................................ 12 1.8 Surface water management................................................................................................. 13 1.9 Groundwater management .................................................................................................. 14 1.10 Environmental water ............................................................................................................ 14 Held Environmental Water ................................................................................................... 14 Planned Environmental Water ............................................................................................. 14 Water Accounting Statements ......................................................................................................... 16 Water Accounting Statement Descriptions..................................................................................... 17 Other statement descriptions ......................................................................................................... 18 Significant water accounting policies ............................................................................................. 19 Quantification of data ..................................................................................................................... 21 Accountability Statement................................................................................................................ 22 Border Rivers catchment................................................................................................................ 23 Water Assets and Water Liabilities ...................................................................................... 23 Changes in Water Assets and Water Liabilities................................................................... 24 Border Rivers catchment: Physical flows mass balance diagram 2010-11......................... 26 Note disclosures................................................................................................................................ 27 Reconciliation and future prospect descriptions............................................................................. 28 Note 1 - Surface water storage ...................................................................................................... 30 Note 2 - River channel storage....................................................................................................... 32 Note 3 - Allocation accounts........................................................................................................... 34 Note 4 - Storage inflow – Glenlyon and Pindari ............................................................................. 37 Note 5 - Storage evaporation and storage rainfall ......................................................................... 39 Note 6 - River evaporation and river rainfall...................................................................................40 Note 7 - Tributary inflow ................................................................................................................. 41 Note 8 - Ungauged runoff estimate ................................................................................................ 42 Note 9 – Groundwater balance methodologies.............................................................................. 43 Note 10 – Flow leaving system/Replenishments ........................................................................... 48 Note 11 – Extractions (NSW) ......................................................................................................... 50 Note 12 - Basic rights ....................................................................................................................