Sydney

                                                                                                   

24.12 Non-physical water distribution system decreases—other lumped

                             

Supporting information   


The volume for the line item is 2,224 ML.

This line item reflects the unused portion of the allocation/claim associated with the water distribution system store for industrial and commercial entitlement holders, and forfeiture of carryover volumes from the Fish River Water Supply Scheme (FRWSS) as detailed below:

  • 2,179 ML of Delta Electricity’s annual allocation/claim from the Coxs River water source
  • 35 ML for Delta Electricity and 10 ML for Lithgow City Council from their carryover volumes from the FRWSS.

Delta Electricity used 22,821 ML (Line item 19.8.8) of water from its calculated volumetric allocation of 25,000 ML (Line item 23.12) from the Coxs River water source resulting in 2,179 ML forfeiture.

Delta Electricity and Lithgow City Council did not use their carryover volumes from the FRWSS during 2009–10 as detailed in Line item 7.15 Nonphysical water distribution system asset—other lumped.

 

Quantification approach   


  • Forfeiture of carryover volumes from the FRWSS for Delta Electricity and Lithgow City Council: see Line item Line item 7.15 Nonphysical water distribution system asset—other lumped for details on the adjustment and forfeiture of carryover volumes from FRWSS.
  • Forfeiture of a part of Delta Electricity’s annual allocation/claim from the Coxs River water source: see information provided below.

 

Data source

Entitlement information from:

Metered data for diversions are from reservoirs from Delta Electricity data spreadsheets.

 

Data provider

  • The Bureau of Meteorology: calculated adjustment and forfeiture of allocation/claim.
  • The NSW Office of Water: entitlement information.
  • Delta Electricity: metered data for diversions from reservoirs.

 

Method

Forfeiture of allocation for the regulated entitlement category is the difference between announced allocation and measured diversions from the reservoirs.

Line item 23.12 provides the calculation method for volumetric value for the announced allocation/claim from regulated flows for the industrial and commercial holder category.

Ultrasonic flow meters were used to measure diversions from Lake Lyell, Lake Wallace and Thomsons Creek Reservoir to the Mt Piper and Wallerawang power stations.

 

Uncertainty

Adjustment and forfeiture of allocation/claim was estimated. Uncertainty is ungraded.

 

Approximations, assumptions, caveats/limitations

For volumetric value for the announced allocation/claim: see ‘Approximations, assumptions, caveats/limitations’ in Line item 23.8.

For measured diversions: nil.