Risk of Spill Information for the Goulburn system

Monday 10 September, 2018

The risk of spill in the Goulburn system at 10 September 2018: 9.8%

This value represents the percentage of years that spills occur from Lake Eildon taking into account the current storage volume, storage releases, inflows and evaporation from the storage using the historic data available.

Note: 10% or lower is the threshold for a declaration that would return water quarantined in spillable water accounts to allocation bank accounts.

Volume needed to fill Lake Eildon at the time of the assessment: 1,208,286 ML

Click here to find the current volumes in Goulburn system spillable water accounts.

 Ranked historic inflow to Lake Eildon

Inflow for the June - August 2018 period is indicated by the red line: 508,516 ML

 Ranked historic inflow to Lake Eildon

The volume difference at Lake Eildon between full supply and the storage volume at the time of the assessment is indicated by the green line: 1,208,286 ML

Notes for charts:

There are 126 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 1June to 31 August in each of those 126 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 (2018).

The second chart displays the volume of inflow to Lake Eildon for the period 1 September to 31 December in each of the 126 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 August 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. For example, in the first chart above, the probability that inflows to Lake Eildon from 1 June to 31 August will be greater than 400,000 ML in any given year is 70%.

Additional notes:

• Current year inflows are based on operational data.