Bulk water storage and supply report - 26 July 2007

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

  • Warragamba –                Negligible
  • Upper Nepean –              Negligible
  • Woronora –                     Negligible
  • Shoalhaven –                  Less than 5mm 
  • Blue Mountains –            Negligible.

As at 3 p.m. Thursday, 26 July 2007, the inflow rate to Warragamba Dam including Shoalhaven transfers was 1,490 megalitres per day and to Tallowa Dam was 1,070 megalitres per day.

 

Date

24 hours to 8 a.m.

As at 3 p.m.

Sydney Max. Temp.

Sydney Rainfall

Bulk Water Supply

Available Storage

% Storage

Fri.

20.7.07

15°C

Nil

1 225 ML

1 479 500 ML

57.2%

Sat.

21.7.07

15°C

0.4 mm

1 152 ML

1 481 500 ML

57.3%

Sun.

22.7.07

16°C

2.0 mm

1 425 ML

1 482 500 ML

57.4%

Mon.

23.7.07

15°C

0.2 mm

1 254 ML

1 483 500 ML

57.4%

Tue.

24.7.07

17°C

Nil

1 331 ML

1 484 500 ML

57.4%

Wed.

25.7.07

18°C

Nil

1 299 ML

1 485 500 ML

57.5%

Thu.

26.7.07

21°C

Nil

1 377 ML

1 486 500 ML

57.5%

 

Total supply for the week

      9 063 ML

Average daily supply during week

      1 295 ML

Volume pumped from Shoalhaven for the week

      3 023 ML

Net weekly storage change (megalitres)

  + 7 740 ML

Net weekly storage change (percentage)

       + 0.3 %

 

Available Water Storage as at 26 July 2007

Storage

Full Operating Storage (ML)

Storage Level (m)

Available Storage (ML)

Available Storage (%)

Net Weekly Change (ML)

Cataract

94,300

- 1.70

80,530

85.4

610

Cordeaux

93,640

- 4.41

63,650

68.0

350

Avon

146,700

- 4.19

105,380

71.8

0

Nepean

69,810

- 1.34

65,580

93.9

-1,560

Woronora

71,790

- 11.09

38,630

53.8

-70

Warragamba

2,027,000

- 15.22

1,060,630

52.3

5,550

Prospect

8,870

- 0.44

6,640

74.9

0

Wingecarribee

24,100

- 1.16

19,160

79.5

-120

Fitzroy Falls

10,000

- 0.25

8,790

87.9

3,080

Tallowa*

35,300*

- 0.01

35,270*

99.9*

-30

Blue Mountains

2,790

 

2,480

88.9

-70

Total

2,584,300

 

1,486,740

57.5

7,740


*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 26 July 2007