1.1 Storages

Supporting information

The volume presented in the water accounting statements (686,630 ML) represents the volume of water held in surface water storages in the Melbourne region at the end of the 2011–12 year.

The volume presented is the sum of the volume held in water storages that have a total storage capacity over 1,000 ML, including the volume of dead storage. The following table presents a breakdown of individual storages in the Melbourne Region.

Water storages
Storage operator Storage Total storage capacity (ML) Dead storage (ML) Storage volume at 30 June 2011 (ML)
Storage volume at 30 June 2012 (ML)
Melbourne Water Cardinia Reservoir 288,964 2,053 206,406 219,792
Greenvale Reservoir 27,501 662 21,382 21,618
Maroondah Reservoir 28,233 6,054 28,393 28,474
O'Shannassy Reservoir 3,123 n/a 3,235 3,208
Silvan Reservoir 40,581 136 34,674 36,447
Sugarloaf Reservoir 99,222 2,969 98,552 96,835
Tarago Reservoir 37,580 n/a 24,000 22,434
Upper Yarra Reservoir 204,985 4,406 142,602 14,8319
Yan Yean Reservoir 33,125 2,859 30,229 30,307
Southern Rural Water Melton Reservoir 14,360 140 13,577 13,992
Merrimu Reservoir 32,215 335 23,889 25,158
Pykes Creek Reservoir 22,119 1,770 28,092 21,637
Rosslynne Reservoir 25,400 150 16,716 18,409
Total 857,408 21,534 671,747 686,630

Thomson Reservoir is not included in the storages as it is located outside of the Melbourne region boundary.

Quantification approach

Data source

Australian Water Resources Information System (AWRIS)—Water storages.

Provided by

Bureau of Meteorology.


Storage volume was measured at the start and end of the reporting period by using gauged water level height(s) in metres, Australian height datum (mAHD) for individual storages. The height measurement was converted to a volume using the storage-volume curve(s) provided by the managing authority.

Storage capacity was calculated using the full supply level (FSL), and converting it to a volume using the storage volume curve(s) provided by the managing authority.

Assumptions, limitations, caveats and approximations

  • Storage-volume curves represent specifically surveyed parts of the water storage, and may not reflect the storage-volume relationship across the entire storage.

  • Water storages are subject to sedimentation and other physical changes over time, which in turn affect the accuracy of the storage-volume curves.

  • Storage capacity may differ from those published on the Water storages page of the Southern Rural Water website due to rounding and uncertainty in the true values.

Uncertainty information

The volume was estimated from measured data.

Comparative year

In the 2011 Account, the volume of water in surface water storages was compiled from two data sources:

  • The storage volumes for Melbourne Water managed storages were obtained from the water storages product (see Quantification approach).
  • The storage volumes for Southern Rural Water managed storages were obtained directly from Southern Rural Water.

Following publication of the 2011 Account, Southern Rural Water provided storage data to the water storages product for the 2011 year and these volumes have been retrospectively updated in the 2012 Account. The difference in the values published in the 2011 account compared to the 2012 Account may be due to the updated values sent by Southern Rural Water.

Consequently, the volume has been restated from 669,642 ML (as published in the 2011 Account) to 671,747 ML as shown in the following table.

Comparative year information for line item 1.1 Storages
Storage operator Storage 2012 Account volume
at 30 June 2011 (ML)
2011 Account volume 
at 30 June 2011 (ML)
Melbourne Water Cardinia Reservoir 206,406 206,406
Greenvale Reservoir 21,382 21,382
Maroondah Reservoir 28,393 28,393
O'Shannassy Reservoir 3,235 3,235
Silvan Reservoir 34,674 34,674
Sugarloaf Reservoir 98,552 98,552
Tarago Reservoir 24,000 24,000
Upper Yarra Reservoir 142,602 142,602
Yan Yean Reservoir 30,229 30,229
Southern Rural Water Melton Reservoir 13,577 13,577
Merrimu Reservoir               23,889 27,757
Pykes Creek Reservoir                 28,092 22,119
Rosslynne Reservoir 16,716 16,716
Total 671,747 669,642