Releases from Lake Eildon continue to trigger spills from spillable water accounts in the Goulburn system. An update to the deductions from spillable water accounts will be made as part of the September 15 seasonal determination assessment.
Volume needed to fill Lake Eildon at 1 September 2022: 164,158 ML
Click here to find the current volumes in Goulburn system spillable water accounts.
Ranked historic inflow to Lake Eildon: June to August
Ranked historic inflow to Lake Eildon: August to December. The volume difference at Lake Eildon between full supply and the storage volume on 1 August is indicated by the green line: 547,948 ML.
Description and Tabulation of the graphical content inflow to Lake Eildon: June – August
A bar graph titled Ranked historic inflow to Lake Eildon: June – August is on the page above. X axis label “% Probability of Exceedance” which spans 99% on the left to 1% on the right. Y axis label is “3 month inflow – units megalitres (ML)”. Significant highlighted data in the graph is the inflow for the June – August 2022 period is indicated by the red line: 736,921 ML.
Each % probability of exceedance is reported from 99% to 1%. The general nature of the information presented is low inflow values of less than 300,000 megalitres have a high probability of occurrence. Less than 10% probability of inflows above 1,149,270 megalitres.
Tabulation of data from the image above of the graph
| 99% |
58,190 |
| 90% |
184,903 |
| 80% |
306,277 |
| 70% |
389,759 |
| 60% |
470,204 |
| 50% |
594,154 |
| 40% |
678,660 |
| 2022 |
736,921 |
| 30% |
742,834 |
| 20% |
890,767 |
| 10% |
1,149,270 |
| 1% |
1,917,160 |
Ranked historic inflow to Lake Eildon: September to December
Ranked historic inflow to Lake Eildon: August to December. The volume difference at Lake Eildon between full supply and the storage volume on 1 August is indicated by the green line: 547,948 ML.
Description and Tabulation of the graphical content inflow to Lake Eildon: September – December
A bar graph titled Ranked historic inflow to Lake Eildon: October – December is on the page above. X axis label “% Probability of Exceedance” which spans 99% on the left to 1% on the right. Y axis label is “3 month inflow – units megalitres (ML)”. Significant highlighted data in the graph is the difference between the full supply volume of Lake Eildon and the volume at 1 September 2022 is indicated by the green line: 164,158 ML.
Each % probability of exceedance is reported from 99% to 1%. The general nature of the information presented is low inflow values of less than 200,000 megalitres have a high probability of occurrence. Less than 10% probability of inflows above 1,101,959 megalitres.
Tabulation of data from the image above of the graph
Tabulation of data from the image above of the graph
| 99% |
49,663 |
| Current airspace |
164,158 |
| 90% |
240,512 |
| 80% |
360,691 |
| 70% |
474,496 |
| 60% |
512,717 |
| 50% |
589,828 |
| 40% |
674,834 |
| 30% |
796,833 |
| 20% |
919,484 |
| 10% |
1,101,959 |
| 1% |
1,951,560 |
Notes for charts:
There are 129 years of historic inflow data available for Lake Eildon (inflow data for the period before the construction of the dam are based on modeled inflows). The first chart displays the volume of inflow to Lake Eildon for the period 1 June to 31 August in each of those 129 years. The volumes of inflow shown are ranked in order from lowest to highest with the red line representing the volume of inflow recorded for the period in the current year (2022).
The second chart displays the volume of inflow to Lake Eildon for the period 1 September to 31 December in each of the 129 years of historic data. The volumes of inflow shown are ranked in order from lowest to highest. The volume difference at Lake Eildon between full supply and the storage volume on 1 September is indicated by the green line.
Probability of exceedance: Probability that the volume of inflow will be equal to or greater than a specified volume in any given year.
Additional notes:
- The volumes in spillable water accounts can change due to seasonal determination increases, provided there has been no low risk of spill declaration made
- Operation to target filling arrangements at Lake Eildon could see reductions to spillable water accounts prior to the storage reaching the full supply level.
- Current year inflows are based on operational data.