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If Lookup Table is choosen as the Decision Type, you must define a configuration table (as shown in Figure 7), which can be entered manually or imported using the Import button. This table is used to determine the Area and Underirrigation Factor for a given value of Available Water. Additionally, for values of Available Water that are not present in the table, linear interpolation is used to determine the other two parameters. For the example shown in Figure 7, if available resources in a RAS are 15000ML, the planting area will be 3000ML based on linear interpolation between (10000, 2000) and (20000, 4000). The available resources from water user (order debit type) is determined from the current account balances plus released water in the river plus on farm storage available water.
Figure 7. Irrigation demand model (Planting Decision, Lookup Table)
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