Sydney
42.5 Releases from storages

Supporting Information

The total releases from storages were 939,755 ML. The volume accounted for in this line item includes releases made to supplement river flows to meet riparian rights (line item 17.6), rules-based environmental flow releases and releases to supply customers (line item 17.2).


Releases from storages during the 2011 Account

Storage/weir

Releases to supply during the 2010–11 year (ML)

Other releases during the 2010–11 year (ML)

Riparian releases during the 2010–11 year (ML)

Environmental releases during the 2010–11 year (ML)

Total (ML)

Cataract

38,069

–

 –

17,896

55,965

Cordeaux

5,266

–

 –

8,624

13,890

Avon

28,976

 –

 –

10,490

39,466

Nepean

38,017

10,978

 –

17,495

66,490

Woronora

15,778

 –

 –

7,126

22,904

Lake Burragorang (Warragamba Dam)

281,795

2,907

9,837

3,197

297,736

Prospect

4,368

5,419

 –

0

9,787

Wingecarribee

3,477

26,285

365

1,095

31,222

Fitzroy Falls

–

 –

 –

9,726

9,726

Lake Yarrunga (Tallowa Dam)

6,574

16,419

 –

219,245

242,238

Blue Mountains

4,552

224

 –

–

4,776

Pheasants Nest Weir

 –

 –

 –

38,877

38,877

Broughton Pass Weir

80,561

–

–

24,649

105,680

Lake Wallace

 –

 –

1,205

–

1,205

Thomson Creek Reservoir

–

–

263

 –

263

Total

507,433

62,232

11,670

358,420

939,755

Quantification Approach

Data Source

Daily Return System (DRS) database.

Provided by

Sydney Catchment Authority.

Method

Known release rates from flow meters, orifice plates, valves with rating tables or measured outlets were used to derive the volume.

Assumptions, Limitations, Caveats and Approximations

Nil.

Uncertainty Information

The volume is based on measured data. Estimated uncertainty based on meter accuracy, and professional judgment on rating tables and site configuration issues is +/– 10%.