Sydney
1.1 Storages

Supporting information

The closing storage volume for Sydney region on 30 June 2013 was 2,813,222 ML. The following tables provide a summary and breakdown of information on storages in the region. Storage volumes reported on 30 June 2012 and 30 June 2013 include dead storage volume. Storages in the region increased in volume over the 2012–13 year by 36,685 ML. Above average rainfall was experienced in 2011–12 and average rainfall over the 2012–13 year and most storages were at 100% capacity across the two years. For more information, please refer to Rainfall in the 'Climate overview' in 'Contextual information'.


Volume of water for each storage in the Sydney region at the start and end of the 2012–13 year
Managing Authority Storage Total capacity (ML) Dead storage volume (ML) Volume (ML)
30 June 2013		 Volume (ML)
30 June 2012
Delta Electricity Lake Lyell1 34,192 2,083 34,1922 34,192
Lake Wallace3 4,004 1,798 4,0044 4,004
Thomsons Creek Dam5 27,500 0 27,5006 27,500
subtotal  65,696 3,881 65,696 65,696
Goulburn Mulwaree Council Pejar 9,000 90 9,000 9,000
Sooley 6,250 300 6,250 6,250
subtotal  15,250 390 15,250 15,250
Lithgow City Council Farmers Creek No. 2 450 Not available 450 450
Shoalhaven City Council Bamarang 3,800 100 3,800 3,350
Danjera 7,660 2,300 7,660 7,660
Flat Rock Creek 400 0 400 405
subtotal  11,860 2,400 11,865 11,415
Sydney Catchment Authority Avon 214,360 67,660 202,410 186,560
Blue Mountains7 2,890 0 2,480 2,640
Cataract 97,370 180 86,640 79,620
Cordeaux 93,640 0 78,750 89,640
Fitzroy Falls 22,920 12,970 22,920 21,960
Lake Burragorang (Warragamba Dam) 2,031,000 4,000 2,031,000 2,016,310
Lake Yarrunga (Tallowa Dam) 90,000 0 90,000 90,000
Nepean 68,100 370 68,100 68,100
Prospect 48,200 14,870 41,550 42,450
Wingecarribee 25,880 1,750 25,120 20,480
Woronora 71,790 0 67,780 62,750
subtotal  2,766,150 101,800 2,716,750 2,680,510
Wingecarribee Shire Council Bundanoon 1,170 n/a 1,170
 1,170
Medway 2,046 n/a 2,046 2,046
subtotal  3,216 0 3,216 3,216
Total 2,862,622 108,4718 2,813,222 2,776,537

1–7 Volume is assumed to be 100% of total capacity due to lack of available data.

8 Based on available data.


Shoalhaven City Council pumps its entitled water from the Shoalhaven River (diverted from Lake Yarrunga) at the Burrier pumping station. Bamarang storage receives water pumped from Burrier pumping station. During the 2012–13 year, all water received from the Burrier pumping station was diverted to water treatment plants or commercial customers (in accordance with established service agreements). Therefore, volumes shown in the above table do not include water pumped from Burrier. Water from Danjera storage is diverted to Bamarang via Burrier Pump Station when there is insufficient diversion from Lake Yarrunga (Tallowa Dam) for pumping at Burrier. No diversions were made during the 2012–13 year.

Quantification approach

Goulburn Mulwaree Council

Data source

Level monitoring at the storages and data spreadsheets.

Provided by

Goulburn Mulwaree Council.

Method

Telemetered electronic level sensors record level data that is converted to a volume using a rating table.

Assumptions, limitations, caveats and approximations

Nil.

Uncertainty information

The volume is based on measured data. Uncertainty value based on meter accuracy and professional judgment is +/– 5%.

Lithgow City Council

Data source

Level monitoring at Farmers Creek No. 2 Reservoir and data spreadsheets.

Provided by

Lithgow City Council.

Method

Manual level readings converted to a volume using a rating table in a spreadsheet.

Assumptions, limitations, caveats and approximations

Information on dead storage volume was not available.

Uncertainty information

The volume is based on measured data. The uncertainty estimate was not quantified.

Shoalhaven City Council

Data source

Level monitoring at the storages managed by Shoalhaven City Council.

Provided by

Shoalhaven City Council.

Method

Telemetered level data were converted to a volume using a rating table.

Assumptions, limitations, caveats and approximations

Nil.

Uncertainty information

The volume is based on measured data. Estimated uncertainty based on accuracy of level sensors and other level measuring devices and rating tables is +/– 5%.

Sydney Catchment Authority

Data source

Level monitoring at storages visual and hydrometric sensors, daily returns database and storage tables for reservoirs.

Provided by

Sydney Catchment Authority.

Method

Water level by visual inspection of gauging boards and from hydrometric sensors. Level readings converted to volume using rating tables. Storage tables for storages were developed from bathymetric surveys and other methods.

Assumptions, limitations, caveats and approximations

Nil.

Uncertainty information

The volume is based on measured data. Estimated uncertainty based on accuracy of sensors and other level measuring devices and professional judgment on rating tables is +/– 5%.

Wingecarribee Shire Council

Data source

Level monitoring at the storages with vega-type hydrometric sensors linking to the council's radio telemetry system and data spreadsheets.

Provided by

Wingecarribee Shire Council.

Method

Water levels received from level sensors located in the storages through the council's radio telemetry system were converted to a volume using rating tables. In addition, water levels obtained by operation officers were loaded into a spreadsheet where rating tables produce storage volume.

Assumptions, limitations, caveats and approximations

Information on dead storage volume was not available.

Uncertainty information

The volume is based on measured data. Estimated uncertainty based on sensor accuracy, organisational practice and professional judgment on rating tables is +/– 10%.