Sydney
17.16 Other delivery of allocated surface water

The volume for this line item is 7,532 ML.

The Sydney Catchment Authority (SCA) manages banked environmental flow in the Sydney region.

SCA released a volume of 28 ML/day of the banked environmental flow from Warragamba Dam from 5 October 2010 to 30 June 2011. This event used 7,532 ML.

Reconciliation of this line item is shown in the following table.

Calculation of other surface water liability for 2010-11 year

Calculation	Line item	Volume (ML)
	5.6 Other surface water liability – opening balance	9,795
add	21.6 Other surface water liability increases	3,100
less	17.16 Other delivery of allocated surface water	7,532
less	13.6 Other surface water liability decreases	0
equals	Closing balance (as at 30 June 2011)	5,363

SCA and NSW Office of Water agreement; Daily Return System (DRS) database; SCA compliance reporting to the NSW Office of Water.

SCA.

For 2010–11, the released banked environmental flow volume was derived from orifice-rating tables and stream gauging downstream of environmental flow release from Warragamba Dam. The banked environmental flow was reduced by the released volume.

Nil.

The volume is based on measured data. Estimated uncertainty based on accuracy of stream gauging is +/– 10%.

The following table compares the value at 30 June 2010 reported in this account with the corresponding value reported in the 2010 Account.

 

Comparative information from the 2010 Account for line item 17.11

2011 Account line item	2010 Account line item	Value reported in the 2010 Account (ML)	Value reported in the 2011 Account (ML)	Additional information
17.16 Other delivery of allocated surface water	14.7.9.7 Allocation diversion of regulated flows – other lumped holders	2,450	2,450	Change in line item name and number