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The National Water Account: an overview
Grace Mitchell Water Accounting Manager
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• Set of 8 region reports
• Amount of water available, traded, accessed and used
• Information that has previously been difficult to access
–in a single location
–consistently presented
What is it?
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• By the Bureau of Meteorology
• In partnership with some 30 water agencies across Australia
• Contributions by a further 7 organisations
How was it prepared?
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• ACTEW Corporation • Adelaide and Mount Lofty Ranges NRM Board • Allconnex Water • Barossa Infrastructure Limited • City West Water • Delta Electricity • Department for Water (SA) • Department of Sustainability and Environment (VIC)• Department of the Environment, Climate Change, Energy and Water
(ACT) • Department of Water (WA) • Goulburn Mulwaree Council • Harvey Water • LinkWater
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• Lithgow City Council • Melbourne Water Corporation • Murray-Darling Basin Authority • NSW Office of Water • Ord Irrigation Cooperative Limited • Palerang Council • Queensland Water Directorate• Queensland Urban Utilities • Queensland Water Commission • SA Water Corporation • SEQ Water Grid Manager • Shoalhaven City Council • South East Water • Southern Rural Water
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• Sydney Catchment Authority • Sydney Water Corporation • Unitywater• Water Corporation (WA) • WaterSecure• Western Region Water Corporation• Wingecarribee Shire Council • Yarra Valley Water
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• New style of reporting
• Financial accounting analogy
• Comprehensive
• Standardised
• Best available data
• 1 July to 30 June
• Annual series
How is it different?
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Walking Through the National Water Account 2010
Grace MitchellWater Accounting Manager
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Comprehensive region information
Who does what?
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Comprehensive region information
What changed?
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Comparing regions
Melbourne Sydney
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Digging into the detail
Richness of the notes
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Wealth of linked information
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Regional Spotlight – Sydney
Wijedasa Alankarage Sub-account Manager
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Sydney Region
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Water assets
•Include– Surface water supply systems
– Urban water distribution systems
•Exclude– Eastern Hawkesbury-Nepean
sub-catchments starting from Mangrove Creek
– Fish river water supply scheme
– Farm dams and private commercial water storages
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The region in context
• Below average rainfall
• Highest on record temperatures for some areas
• Above average evaporation
• Sydney’s desalination plant commenced water delivery
• 2010 Metropolitan Water Plan was completed
Annual rainfall deciles for the Sydney region during 2009–10
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Water accounting statement
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Connected surface water inflows
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Urban recycled water discharge to connected surface water
Supporting information
Sydney Water Corporation released 1,980 ML of recycled water from St Marys Water Recycling Plant to Boundary Creek (a tributary of the Nepean River).
Quantification approaches
Data source
Metered data reported in Sydney Water Corporation’s Water Conservation and Recycling Implementation Report 2009–10
Data provider
Sydney Water Corporation
Method
The volume was extracted from measured data used in Sydney Water Corporation’s Water Conservation and Recycling Implementation Report 2009–10.
Uncertainty
The volume is based on measured data. Estimated uncertainty based on meter accuracy is +/–2%.
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Urban Water System – Sydney, Illawarra and Blue Mountains
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Regional Spotlight – Murray–Darling Basin
Wijedasa Alankarage Sub-account Manager
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Murray–Darling Basin Region
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Water assets
•Include– Water storages, rivers and
streams
– Groundwater aquifers
•Exclude– Snowy Mountain reservoirs
– Great Artesian Basin
– Farm dams and private commercial water storages
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The region in context
• Above average rainfall
• Highest on record temperatures for some areas
• Average evaporation
• Severe flooding and record flows in the northern basin
• The water sharing plan for the NSW Border Rivers Regulated River Water Source commenced
Annual rainfall deciles for the MDB region during 2009–10
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Water accounting statement
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Connected surface water store assets
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Storage reservoirs
• 49 reservoirs
• Total capacity: 23,069,000 ML
• Total volume on 30 June 2010: 7,346,000 ML (32% full)
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Thank you…
www.bom.gov.au/water
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www.bom.gov.au/water/nwa/2010
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Thank you…
www.bom.gov.au/water