Document ID: chunk:federal_register_of_legislation:F2024C00760:reg:80:p6
Version: federal_register_of_legislation:F2024C00760
Segment Type: reg
Provision Reference: reg 80 (pt 6/9)
Character Range: 593304–596177

recovery volume is maintained.

S6.07 Limits of changes in score or outcomes
The following limits of change in score or outcome will apply in the method under the historic climate conditions:
            (a) for each region of the Basin—no reduction in the benchmark environmental outcome scores, although some reductions in individual elements may be permitted if they are offset by increases in other elements;
            (b) for each reach:
                (i) where the benchmark model run achieves or exceeds the target frequency range for a flow indicator, achievement of the target frequency range must be retained and the frequency result must not vary by more than 10% of the benchmark result; and
                (ii) where the benchmark model run does not achieve the target frequency range for a flow indicator, the frequency result must not vary by more than 10% of the benchmark result, and not fall below the baseline model result; and
                (iii) where the benchmark model run provides little improvement in frequency for a flow indicator (less than 50% progress toward the target range from the baseline model result), the frequency result must not vary by more than 15% of the benchmark result, and not fall below the baseline model result; and
Note: Where a flow indicator exceeds these limits of change, but other indicators at the site are within the limits of change, modelling under the method will redistribute the use of environmental water amongst flow indicators to balance outcomes with respect to subparagraphs (i) to (iii). Consistent with section S6.06(3) redistribution of environmental water will occur to the minimum extent necessary to ensure that the limits of change are met and not to otherwise affect environmental flow outcomes in the benchmark model.
                (iv) where a supply measure or combination of measures can achieve the ecological outcomes sought by the plan as represented by an ecological target or targets, and a flow indicator or indicators and associated benchmark model results, then subparagraphs (i) to (iii) do not apply to that flow indicator or indicators;
            (c) for the Coorong, Lower Lakes, Murray Mouth—maintenance or improvement of the following:
                (i) Lake Alexandrina salinity: less than 1500EC for 100% of the time and less than 1000EC for 95% of days;
                (ii) Barrage flows: greater than 2000 GL per year on a three year rolling average basis with a minimum of 650 GL in any year, to be achieved for 95% of years;
                (iii) Barrage flows: greater than 600 GL over any two year period, to be achieved for 100% of the time;
                (iv) Coorong salinity: South Lagoon average daily salinity less than 100 grams per litre for 96% of days;
                (v) Mouth openness: Mouth open to an average annual depth of 1 metres (‑1.0