Weekly water update

Data for week ending 21 July 2016
Last update at 5:00 PM 21 July 2016

Dam storage levels


1112.2 billion litres this week


More than week ending 14 July 2016

Avg. catchment rainfall

0.8 mm

This week


Less than week ending 14 July 2016

Flow into dams

13,769 ML

This week


Less than week ending 14 July 2016

Water use

144 L

Daily avg. per person this week


More than week ending 14 July 2016

Storages climb despite low rainfall


Melbourne’s water storage levels have increased by 0.5% of capacity over the past week.

The 8.2 billion litre gain, which is fairly typical for winter, occurred despite almost no rain falling across the major catchments.

The Thomson, Upper Yarra, O’Shannassy and Maroondah Reservoirs received between 0 to 2 mm of rain, the average being 0.8 mm.

This was 96.8% below the long-term average for the period of 24.7 mm.

The rise in storage levels can be attributed to healthy rainfalls from previous weeks making its way through catchments into the reservoirs.

The 13.8 billion litres of stream flow was 3.2% below the 30-year average for the period (14.2 billion litres).

Water storages are now 61.4% (1,112.2 billion litres) full, compared with 69.0% (1,250.1 billion litres) at the
same time last year - a difference of 137.9 billion litres.

Melbournians used an average of 144 litres of water per person per day, 4 litres more than the previous week. 

Permanent water use rules are currently in place and Target 155 has been launched to encourage Melburnians to reduce water consumption.

Information on Target 155 is available on the Department of Environment, Land, Water and Planning’s website or by contacting your local water retailer.

Dam storage levels

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61.4% full at 21 July 2016

1,112,195 ML
Reservoir Total capacity (ML) Current volume (ML) % Full Rainfall recorded (mm)
Thomson 1,068,000 619,098
+6,305 since last week
58.0% 0.8 (verified)
View hourly unverified
Cardinia 286,911 182,946
-517 since last week
63.8% N/A
View hourly unverified
Upper Yarra 200,579 105,931
+49 since last week
52.8% 0 (verified)
View hourly unverified
Sugarloaf 96,253 73,368
+1,769 since last week
76.2% N/A
View hourly unverified
Silvan 40,445 34,181
-82 since last week
84.5% N/A
View hourly unverified
Tarago 37,580 35,120
+113 since last week
93.5% N/A
View hourly unverified
Yan Yean 30,266 24,363
+50 since last week
80.5% N/A
View hourly unverified
Greenvale 26,839 22,037
+321 since last week
82.1% N/A
View hourly unverified
Maroondah 22,179 12,317
+236 since last week
55.5% 2 (verified)
View hourly unverified
O'Shannassy 3,123 2,834
-10 since last week
90.8% 2 (verified)
View hourly unverified
Total 1,812,175 1,112,195
+8,234 since last week
61.4% 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 0.8 24.2 -96.7% 18.8mm
Upper Yarra 0.0 23.4 -100.0% 35.4mm
O'Shannassy 2.0 32.8 -93.9% 52.8mm
Maroondah 2.0 21.9 90.0% 30.4mm

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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 6,708 5,980 12.2% 9,583
Upper Yarra 3,311 3,810 -13.1% 8,612
O'Shannassy 2,104 2,410 -12.7% 4,760
Maroondah 1,646 2,030 -18.9% 4,197
Total 13,769 14,230 3.2% 27,152

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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 144 140

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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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