Melbourne
17.11 Surface water allocation diversion

Supporting Information

The volume presented in the water accounting statements (6,512 ML) represents the volume of water diverted for irrigation under high reliability water shares and low reliability water shares in the Melbourne region during the 2010–11 year.

Diversions during the 2010–11 year were very low in the region, despite the high allocation volume. This was due to the wet conditions experienced during the period compared to the preceding dry years. Rainfall in the region was adequate for irrigators to not have to use their full allocation.

Breakdown of diversions during 2010–11 year

Class

Location

Entitlement volume (ML)

Allocation
(% of entitlement)

Allocation
volume (ML)

Metered
diversion (ML)

Diversion % of allocation

High reliability water shares

Werribee Irrigation District

10,040

100

10,040

5,319

53

Werribee River

907

100

907

247

27

Bacchus Marsh Irrigation District

3,880

100

3,880

945

24

Lake Merrimu direct access

190

100

190

1

.5

Bacchus Marsh other1

521

100

521

0

0

High Reliability Water Shares total

15,538

100

15,538

6,512

42

Low reliability water shares

Werribee Irrigation District

4,777

55

2,627

0

0

Werribee River

435

55

239

0

0

Bacchus Marsh Irrigation District

2,030

55

1,117

0

0

Low reliability water shares total

7,242

55

3,983

0

0

Total all water shares

22,780

86

19,521

6,512

0

1 Represents entitlement holders who are outside the designated irrigation district

 

Quantification Approach

Data Source

Southern Rural Water.

Provided by

Southern Rural Water.

Method

Southern Rural Water meter all high-reliability and low-reliability water shares in the Melbourne region.

Assumptions, Limitations, Caveats and Approximations

Nil.

Uncertainty Information

Uncertainty is +/– 5% due to known errors in meters.

Comparative year

This item corresponds to line item 14.7.2.2 Allocated diversion on regulated flows reported in the 2010 Account. There was no change to the volume reported in the 2010 Account. The comparative year volume is 2,553 ML.