Table 9 Site-specific ecological targets and associated flow indicators for In-channel flows: Lower Namoi River Without-development and baseline event Site-Specific Flow Indicators frequencies Proportion of years Frequency -proportion of Minimum Flow event occurred Proportion of years years event required Site-Specific Ecological Targets rate required in under modelled event occurred under the Namoi River Duration Timing modelled baseline Low High up-stream of conditions (%) uncertainty uncertainty Bugilbone (ML/d) conditions (%) (%) (%) 45 days total Provide a flow regime which ensures 4,000 (with 7 day 25% 22% 32% 16% the current extent of native vegetation minimum) of the anabranch communities is sustained in a healthy, dynamic and 60 days total resilient condition 1,800 (with 6 day 39% 29% 49% 30% Events preferably minimum) clustered in late Provide a flow regime which supports spring/summer as recruitment opportunities for a range well as winter but of native aquatic species (e.g. fish, timing not frogs, turtles, invertebrates) 75 days total constrained Provide a flow regime which supports 500 with a 25 day 55% 41% 69% 33% key ecosystem functions, particularly minimum) those related to longitudinal connectivity and transport of sediment, nutrients and carbon a Duration is expressed both as a total and minimum, allowing multiple smaller flow events that meet the minimum the minimum duration criteria to comprise a successful event. Minimum durations are therefore a subset of total duration and should not be read independently. 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 9 Site-specific ecological targets and associated flow indicators for In-channel flows: Lower Namoi River Site-Specific Ecological Targets Site-Specific Flow Indicators Without-development and baseline event frequencies Minimum Flow rate required in the Namoi River up-stream of Bugilbone (ML/d) Duration Timing Frequency -proportion of years event required Proportion of years event occurred under modelled conditions (%) Proportion of years event occurred under modelled baseline conditions (%) Low uncertainty (%) High uncertainty (%) Provide a flow regime which ensures the current extent of native vegetation of the anabranch 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, invertebrates) Provide a flow regime which supports key ecosystem functions, particularly those related to longitudinal connectivity and transport of sediment, nutrients and carbon 4,000 45 days total (with 7 day minimum) Events preferably clustered in late spring/summer as well as winter but timing not constrained 25% 22% 32% 16% 1,800 60 days total (with 6 day minimum) 39% 29% 49% 30% 500 75 days total with a 25 day minimum) 55% 41% 69% 33% a Duration is expressed both as a total and minimum, allowing multiple smaller flow events that meet the minimum the minimum duration criteria to comprise a successful event. Minimum durations are therefore a subset of total duration and should not be read independently. 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.