Table 6 Site-specific ecological targets and associated flow indicators for Lachlan Swamp Without-development and baseline Site-Specific flow indicators event frequencies Event Frequency-proportion of years event Proportion of Proportion of required to achieve target (%) years the event years event Ecological Target occurred under occurred under Flow Duration Low uncertainty High uncertainty Timing modelled modelled required (days) (%) (%) baseline (ML/d) conditions (%) conditions (%) Provide a flow regime which ensures the current 20 (minimum 850 60 50 65 47 extent of native vegetation of the riparian, continuous) floodplain and wetland communities is sustained 70 (total in a healthy, dynamic and resilient condition duration 850 40 33 50 23 Provide a flow regime which supports recruitment above flow opportunities for a range of native aquatic species threshold)a (e.g. fish, frogs, turtles and invertebrates) (June to 60 (minimum Provide a flow regime which supports key November) 1,000 30 20 30 20 continuous) ecosystem functions, particularly those related to connectivity between the river and the floodplain Provide a flow regime which supports the habitat 50 (minimum 2,500 20 20 23 18 requirements of waterbirds and is conducive to continuous) successful breeding of colonial nesting waterbirds a Duration is expressed both as a total and minimum duration, allowing multiple smaller flow events that met the minimum duration criteria to comprise a successful event. Minimum durations are therefore a subset of total duration and should not be read independently. MDBA analysis showed that if a minimum duration is not specified and individual events must meet the total duration criteria, this resulted in a significantly reduced proportion of years. Note: Multiplication of the flow rate by the duration and frequency (proportion of years event required) does not translate into the additional volume of water the site needs to be environmentally sustainable. This is because part of the required flow is already provided under baseline conditions. Additional environmental water required is the amount over and above the baseline flows.
Table 6 Site-specific ecological targets and associated flow indicators for Lachlan Swamp Ecological Target Site-Specific flow indicators Without-development and baseline event frequencies Event Frequency-proportion of years event required to achieve target (%) Proportion of years the event occurred under modelled conditions (%) Proportion of years event occurred under modelled baseline conditions (%) Flow required (ML/d) Duration (days) Timing Low uncertainty (%) High uncertainty (%) Provide a flow regime which ensures the current extent of native vegetation of the riparian, floodplain and wetland communities is sustained in a healthy, dynamic and resilient condition Provide a flow regime which supports recruitment opportunities for a range of native aquatic species (e.g. fish, frogs, turtles and invertebrates) Provide a flow regime which supports key ecosystem functions, particularly those related to connectivity between the river and the floodplain Provide a flow regime which supports the habitat requirements of waterbirds and is conducive to successful breeding of colonial nesting waterbirds 850 20 (minimum continuous) (June to November) 60 50 65 47 850 70 (total duration above flow threshold)a 40 33 50 23 1,000 60 (minimum continuous) 30 20 30 20 2,500 50 (minimum continuous) 20 20 23 18 a Duration is expressed both as a total and minimum duration, allowing multiple smaller flow events that met the minimum duration criteria to comprise a successful event. Minimum durations are therefore a subset of total duration and should not be read independently. MDBA analysis showed that if a minimum duration is not specified and individual events must meet the total duration criteria, this resulted in a significantly reduced proportion of years. Note: Multiplication of the flow rate by the duration and frequency (proportion of years event required) does not translate into the additional volume of water the site needs to be environmentally sustainable. This is because part of the required flow is already provided under baseline conditions. Additional environmental water required is the amount over and above the baseline flows.
EWR-Lachlan-Swamp.docx