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.
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 |
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
Provided by
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.
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 |