Weekly water update

Data for week ending 21 May 2015
Last update at 3:00 PM 21 May 2015

Dam storage levels


1261.3 billion litres this week


More than week ending 14 May 2015

Avg. catchment rainfall

10.3 mm

This week


Less than week ending 14 May 2015

Flow into dams

9,646 ML

This week


More than week ending 14 May 2015

Water use

147 L

Daily avg. per person this week


More than week ending 14 May 2015

Storages gain from previous rain

Melbourne’s water storages continued to rise this week, increasing by 0.2% of capacity.

The 3-billion litre gain was due largely to the legacy of high rainfall in the previous week.

The four major catchments received between 3.0 and 23.2 mm of rain, the average being 10.3 mm. This was about half of the long-term average for the period (20.2 mm).

The key to the weekly rise was the high rate of streamflow - essentially last week’s rainfall continuing to make its way through the catchments.

The 9.6 billion litres of stream flow was almost double the 30-year average for the period (5.0 billion litres).

The weekly result also accounts for the release of 2.3 billion litres of environmental flows into the Yarra River.

Storages are now 69.6% (1,261.3 billion litres) full, compared with 71.4% (1,294.3 billion litres) at the same time last year – a difference of 33 billion litres.

Residential water use increased slightly, partly due to lower rainfall. Melburnians used an average of 147 litres of water per person per day. This is 5 litres a day more 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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69.6% full at 21 May 2015

1,261,263 ML
Reservoir Total capacity (ML) Current volume (ML) % Full Rainfall recorded (mm)
Thomson 1,068,000 777,789
+4,062 since last week
72.8% 3 (verified)
View hourly unverified
Cardinia 286,911 175,151
+822 since last week
61.0% N/A
View hourly unverified
Upper Yarra 200,579 103,470
-5,207 since last week
51.6% 14.2 (verified)
View hourly unverified
Sugarloaf 96,253 72,402
+1,054 since last week
75.2% N/A
View hourly unverified
Silvan 40,445 35,621
+31 since last week
88.1% N/A
View hourly unverified
Tarago 37,580 37,359
+544 since last week
99.4% N/A
View hourly unverified
Yan Yean 30,266 25,636
+76 since last week
84.7% N/A
View hourly unverified
Greenvale 26,839 20,375
+437 since last week
75.9% N/A
View hourly unverified
Maroondah 22,179 10,652
+1,438 since last week
48.0% 23.2 (verified)
View hourly unverified
O'Shannassy 3,123 2,808
-286 since last week
89.9% 17.8 (verified)
View hourly unverified
Total 1,812,175 1,261,263
+2,971 since last week
69.6% 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 3.0 19.0 -83.8% 4.6mm
Upper Yarra 14.2 21.0 -31.4% 4.8mm
O'Shannassy 17.8 25.0 -29.1% 10.0mm
Maroondah 23.2 21.0 11.5% 9.0mm

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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 4,697 1,980 137.2% 1,235
Upper Yarra 1,610 990 62.6% 126
O'Shannassy 1,560 1,040 50.0% 449
Maroondah 1,779 970 83.4% 572
Total 9,646 4,980 93.7% 2,382

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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 147 142

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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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