Introduction
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Further detail about the node's configuration is described in their respective links shown above.
Table 1 shows the different objectives that can be achieved using the EDM using a set of flow rules. These rules can be grouped and prioritised to ensure that the required environmental needs are met. The the Commonwealth Environmental Water Holder Framework (shown in Table 1) , which determines environmental watering actions whereby watering options for a specific asset are a function of water availability.
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The following assumptions are made when EDM is configured in Source:
- Water requirements are not additive - A basic assumption used in the EDM is that environmental water is not consumed and, as such, flow rule water requirements for more than one environmental asset can potentially use the same water in accounting for the success of their flow rules being met. For example the minimum flow requirement for fish passage is not necessarily a separate parcel of water from the minimum flow required to prevent an algal bloom;
- Flow rules can be co-dependent: A flow rule can be conditionally contingent on another flow rule also being met;
- Flow rules should only be attempted if their requirements are likely to be met: The EDM determines the daily demand, however before passing the demand for this day, the EDM checks to see if the total water required to complete the rule is available; and
- The highest priority environmental water demand is for environmental flow rules which have commenced but not yet completed. If an environmental flow rule has started to be met, then the continuation of meeting this flow rule requirement has precedence over commencing water ordering to meet a new flow rule.
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- Flood/Fresh - specifies a flood fresh, usually associated with a recruitment event such as to trigger fish movement, water floodplain vegetation;
- Flow pattern - specifies a pattern of flow, used to define multi-peak events;
- Minimum - specifies a minimum flow, usually applied to maintain minimum habitat requirements; and
- Translucency - specifies the flow requirements in terms of some other time series, usually the release from a dam based on the inflow of the dam.
These rules A combination of these rules can be used to meet specific environmental outcomes. They are configured in the environmental demand node's feature editor. For details on what to configure configuring each of these rules in Source, refer to Environmental Demand node.
The EDM has four different types of flow rule, and for eachFor each flow rule in the EDM, you can configure several flow characteristics that can be altered. A common feature across the flow rule types is the concept that they can be applied to a specific time of the year. This is termed the ‘season’ of the rule and is defined by a start and end day and month value.
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