Sydney
17.6 Diversions - other statutory rights

Supporting Information

This line item provides information on water use associated with riparian and cultural basic rights. The estimated volume for the line item is 32,555 ML for 2010–11.

Detailed breakdown of diversions under these rights is given in the following table. More details about riparian right and cultural basic right are available in Water rights, entitlements, allocations and restrictions.


Estimated water use for rivers of the Sydney region

Water source

Estimated water use for 2010–11 (ML/yr)

Riparian right

Cultural basic right

Total

Shoalhaven River

4,840

0

4,840

Illawarra River

1,467

0

1,467

Upper Nepean and Upstream Warragamba rivers

7,676

0

7,676

Hawkesbury and Lower Nepean rivers

9,279

0

9,279

Southern Sydney rivers

4,825

0

4,825

Northern Sydney rivers

4,059

0

4,059

Kangaroo River

382

27

409

Total

32,528

27

32,555

 

The following reservoir releases were made to supplement river flows to meet the above riparian needs.


Reservoir releases to supplement river flows

Reservoir

Releasing authority

Diversion during 2010–11 (ML)

Lake Wallace

Delta Electricity

1,205

Thomson Creek Reservoir

Delta Electricity

263

Lake Burragorang (Warragamba Dam)

Sydney Catchment Authority

9,837

Wingecarribee

Sydney Catchment Authority

365

Total

11,670

 

Quantification Approach

Data Source

New South Wales Government, NSW Office of Water: Water Sharing Plan for the Kangaroo River Water Source and NSW Office of Water: Draft Water Sharing Plan – Greater Metropolitan Unregulated River Water Sources.

Provided by

NSW Office of Water.

Method

The estimated annual water abstraction under riparian right for stock and domestic purposes and for cultural purposes was extracted from Draft Water Sharing Plan — Greater Metropolitan Unregulated River Water Sources and the Water Sharing Plan for the Kangaroo River Water Source.

The estimation of riparian requirements for stock and domestic purposes is based on a variety of inference techniques, professional judgement, and local knowledge on water use, stocking rates, population and property shape.

Assumptions, Limitations, Caveats and Approximations

  • The draft water sharing plan indicates that the estimates of basic landholder requirements may be reviewed following the public exhibition of the draft.
  • No cultural basic rights are estimated to occur in areas other than Kangaroo River system.

Uncertainty Information

The volume was estimated. The uncertainty in this estimate is also estimated to be +/– 30% to 50%based on professional judgment and established practice within the NSW Office of Water.

Comparative year

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 17.6

2011 Account line item

2010 Account line item

Value reported in the 2010 Account (ML)

Value reported in the 2011 Account (ML)

Additional information

17.6 Diversions – other statutory rights

14.5.1 Surface water diversion – riparian right

32,555

32,555

Change in line item name and number