Weekly water update

Data for week ending 30 July 2015
Last update at 5:00 PM 30 July 2015

Dam storage levels


1259.0 billion litres this week


More than week ending 23 July 2015

Avg. catchment rainfall

29.3 mm

This week


More than week ending 23 July 2015

Flow into dams

13,117 ML

This week


More than week ending 23 July 2015

Water use

146 L

Daily avg. per person this week


Less than week ending 23 July 2015

Rain delivers typical winter storage rise of 0.4%

Above-average rainfall over the major catchments has seen storage levels continue to rise over the past week.

Storage increased by 0.4% of capacity, representing a net gain of 7.5 billion litres – the equivalent of about a week’s water supply to Melbourne.

The result is consistent with what is typically expected over winter when storages rise by an average of 0.4% a week.

The four major catchments received between 16.4 and 38.8mm of rain with an average of 29.3mm. This was almost 16% above the long-term average of 25.2mm.

Despite the good rainfall, stream flow into the major reservoirs (13.1 billion litres) was slightly less than the long term norm (14.7 billion litres).

Water storages are now 69.5% (1,259 billion litres) full, compared with 77.2% (1,400 billion litres) at the same time last year – a difference of 140.8 billion litres.

Melburnians used an average of 146 litres of water per person per day. This is 4 litres less than the previous week.

Permanent water use rules are currently in place. View water use rules and water saving tips or contact your local water retailer for advice.

Dam storage levels

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69.5% full at 30 July 2015

1,258,988 ML
Reservoir Total capacity (ML) Current volume (ML) % Full Rainfall recorded (mm)
Thomson 1,068,000 769,957
+5,104 since last week
72.1% 27.8 (verified)
View hourly unverified
Cardinia 286,911 169,037
+662 since last week
58.9% N/A
View hourly unverified
Upper Yarra 200,579 108,770
-826 since last week
54.2% 32 (verified)
View hourly unverified
Sugarloaf 96,253 63,934
0 since last week
66.4% N/A
View hourly unverified
Silvan 40,445 36,089
+406 since last week
89.2% N/A
View hourly unverified
Tarago 37,580 37,753
+18 since last week
100.0% N/A
View hourly unverified
Yan Yean 30,266 26,029
0 since last week
86.0% N/A
View hourly unverified
Greenvale 26,839 24,368
+427 since last week
90.8% N/A
View hourly unverified
Maroondah 22,179 20,105
+1,552 since last week
90.6% 16.4 (verified)
View hourly unverified
O'Shannassy 3,123 2,946
+175 since last week
94.3% 38.8 (verified)
View hourly unverified
Total 1,812,175 1,258,988
+7,518 since last week
69.5% N/A

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Dam storage levels includes all of Melbourne's water storage areas that receive water from catchments and the desalination plant.


Monthly average storage levels of Melbourne's reservoirs over the years. Data is updated at the end of each month. View our interactive storage graph, displaying data from 1940 - present.

Rainfall at dams

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Catchment This week (mm) This week's long term average (ML) based on mean from previous 30 years Variation
(to the average)
Same time last year
Thomson 27.8 23.0 23.0% 12.2mm
Upper Yarra 32.0 26.0 21.7% 24.0mm
O'Shannassy 38.8 34.0 15.1% 28.0mm
Maroondah 16.4 25.0 -33.3% 14.0mm

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Rainfall data is a weighted average catchment figure that is validated and provided for four major catchments only.

Flow into dams

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Catchment This week (ML) This week's long term average (ML) based on mean from previous 30 years Variation
(to the average)
Same time last year (ML)
Thomson 6,463 6,230 3.7% 6,693
Upper Yarra 3,149 3,870 -18.6% 5,578
O'Shannassy 1,726 2,550 -32.3% 3,700
Maroondah 1,779 2,060 -13.6% 2,951
Total 13,117 14,710 10.8% 18,922

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Flow into dams is a total of water flowing from our four major catchments into reservoirs.

Water use for Melbourne

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Daily water use This week's daily average (L) Last week's daily average (L)
Per Person Water Use 146 150

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Water use shows Melbourne's total usage each day and includes Western Water. The total amount used by all Melbournians -both business and households.

All figures include non-metropolitan supply for Western Water (supplied since March 2000), which are not included in annual Melbourne metropolitan consumption figures.

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