Scenario input sets allow you to easily keep model structure, while switching between groups of input data and parameters. These may be used to represent changeable physical attributes, such as climate, land use decisions or even proposed infrastructure characteristics. You can switch between different scenario input sets to compare the effects on a model. For example, you can have one scenario input set consisting of rainfall, inflow and evapotranspiration data for natural conditions, another for wet conditions and a third set for dry conditions.
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Figure 2. Scenario input sets, parameter entry
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Child scenario input sets allow you to further refine model scenarios. A child scenario input set inherits all parameters and data sources specified in its parents. If changes are made to the parent scenario input set, existing and new children will inherit those changes. You can then set additional parameters, or alter existing ones, overwriting the inherited parameters. When you run a model with a child scenario input set, for any parameters that differ between the parent and child, the parameters from the child will take precedence.
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- You can create 'grandchildren', thus creating nested scenario input sets. Every child scenario input set inherits all parameters above it in its branch, and ignores any parameters set in its children.
- Deleting a parent will delete all of its children.
- Within both the Configure dialog (Figure 1) and Results Manager (LINK to naming), child scenario input sets are referred to be their full path, eg. Dry Weather.Water Restriction Level 1.New Dam.
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Nodes.Wheat Fields.Inactive Demand Models.Irrigator #0.Crops.Wheat Crop.Planting Decision.Plant Date.Use Expression=False
Nodes.Wheat Fields.Inactive Demand Models.Irrigator #0.Crops.Wheat Crop.Planting Decision.Plant Date.Day=20
Nodes.Wheat Fields.Inactive Demand Models.Irrigator #0.Crops.Wheat Crop.Planting Decision.Plant Date.Month=12
You can also use scenario input sets to change the active demand model at a water user node, for example:
Nodes.Water User 3.Demand Model=MyInactiveDemandModel
If you wish to change some parameters in an inactive demand model, and also make it the active model, then you need to specify the parameter changes first. An example is shown in Figure 2 for the inactive demand model Irrigator #0.
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