Water storage and supply report - 31 July 2008

During the week the following rainfall (approximately) was recorded in the catchments:

Warragamba

Less than 5 mm

Upper Nepean

20 mm

Woronora

40 mm

Shoalhaven

20  mm

Blue Mountains

15 mm

As at 3 pm Thursday, 31 July 2008, the inflow rate to Warragamba Dam including Shoalhaven transfers was 950 megalitres per day and to Tallowa Dam was 490 megalitres per day.

The available storage as at 3 p.m. Thursday, 24 July 2008 was 66.0%.

Date

24 hours to 8 a.m.

As at 3 p.m.

Sydney Max. Temp.

Sydney Rainfall

Bulk Water Supply

Available Storage

% Storage

Fri.

25.7.08

16 °C

9.0 mm

1 150 ML

1 722  000 ML

66.0 %

Sat.

26.7.08

13 °C

16.0 mm

1 179 ML

1 722  000 ML

66.0 %

Sun.

27.7.08

17 °C

Nil

1 322 ML

1 721 500 ML

66.0 %

Mon.

28.7.08

18 °C

4.0 mm

1 413 ML

1 722  000 ML

66.0 %

Tue.

29.7.08

14 °C

33.0 mm

1 112 ML

1 723 000 ML

66.0 %

Wed.

30.7.08

15 °C

0.2 mm

1 120 ML

1 723 500 ML

66.1 %

Thu.

31.7.08

15 °C

0.4 mm

1 246 ML

1 724 500 ML

66.1 %

 

Total supply for the week

8 542 ML

Average daily supply during week

1 220 ML

Volume pumped from Shoalhaven for the week

2 759 ML

Net weekly storage change (megalitres)

+ 1 620 ML

Net weekly storage change (percentage)

+0.1  %

 

Available Water Storage as at 31 July 2008

Storage

Full Operating Storage (ML)

Storage Level (m)

Available Storage (ML)

Available Storage (%)

Net Weekly Change (ML)

Cataract

94 300

- 0.88

86,960

92.2

-320

Cordeaux

93 640

- 0.74

87,990

94.0

-670

Avon

146 700

- 1.89

127,350

86.8

-300

Nepean

69 810

- 4.47

56,350

80.7

-340

Woronora

71 790

- 8.51

44,990

62.7

 -20

Warragamba

2 027 000

- 12.01

1,231,160

60.7

0

Prospect

33 300

- 0.55

30,440

91.4

30

Wingecarribee

24 100

- 1.77

16,660

69.1

60

Fitzroy Falls

10 000

- 0.17

9,200

92.0

730

Tallowa*

35 300*

- 0.57

31,040*

87.9*

 1,790

Blue Mountains

2 790

 

2,210

79.2

-20

Total 

2 608 730 

 

1,724,350

66.1

1,620


*NOTE: The "full operating storage" for Tallowa Dam refers only to the amount of water in the dam that is available to be transferred to Sydney and the Illawarra.  When full, the dam can hold 90,000 ML but only 35,300 ML is available to be transferred.

Other water from Tallowa Dam is provided to Shoalhaven City Council for supply to local communities.  Water is also released from the dam as environmental flows for the Shoalhaven River.

 

 Graph of available storage at 31 July 2008