Triggers are used to initiate or cancel certain actions for an account, account host, account type or system in a resource assessment system. This page provides details of the different types of triggers available in Resource Assessment systems, along with types of actions that can be initiated.
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| Condition | Description |
|---|---|
| End of water year | Triggers an action at the end of the water year. |
| Function | Triggers an action using a defined function. The format of a function should be as follows: if( A > B,1,0), where “1” indicates the action will occur and “0” means the action will not happen. |
| Monthly trigger | Tiggers an action for a particular month. You must specify whether to offset from the start or end of the month, along with the number of days. |
| Per-timestep | Triggers an action per a specified number of time-steps. You can choose to reset the repeat interval at the start of each water year. |
| Season | Triggers an action for a specified season. You must define and start and end dates. |
| Specified date | Triggers an action on a specified date. |
| Start of water year | Triggers an action at the start of the water year. You can choose to repeat the action at a specified number of timesteps, and whether to reset the repeat interval at the start of each water year. |
| Storage level | Trigger based on a specified storage level. You must specify the storage, the level and whether the level is rising or falling. |
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This trigger adjusts one of several parameters (eg. account balance, available water) based on a specified percentage or volume. The available parameters that can be adjusted are shown in Figure 2, see Table 1 for explanations. A positive value indicates an addition; a negative values represents a deduction. The example shown in Figure 2 represents an evaporation loss of 5% of available water. This will reduce 5% of available water, so 95% of available water is left in available water balance.
Priority
When adjusting from available water or total water, the priority specified for the account in the associated water user node (the Priority field as shown here) is is used to determine the order that the accounts are deducted from, with the lowest highest priority (the larger lowest number) account deducted from first. Consider . For crediting (ie. incoming water), specify the account you want to hold the water in. The priorities in this case would be in the reverse order to which they appear in the water user node.
For example, consider a water user with one account and a single carryover; the priority of use is carryover first, then account balance. This trigger then deducts the desired volume from carryover first; if insufficient water is available, the residual is subtracted from the account balance.
Spillable Water
When the adjusted model parameter has spillable water:
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Transfer
Transfers a specified proportion percentage or volume of account balance, available water or carryover between different account types, account hosts or accounts (Figure 6). For a positive transfer, water moves from source to destination; in a negative transfer, it moves in the reverse direction. The percentage transferred can be a percentage of the aforementioned parameters and also entitlement, see Table 2 for a definition of these parameters.
For transfer from available water, the priority of transferring water operation is similar to of an adjustment trigger (uses the Priority set at the the Priority set at the water user, see see Adjustment - Priority). For example, for a two water userusers, both with one account and a carry over. Priority of use for both users is carryover first, then account balance. This trigger transfers the desired volume from carryover first, if insufficient water is available, the residual would be subtracted from the account balance. The transferred volume would be added to water user's account balance ' up to max maximum balance. Any extra water would be added to the carryover balance.
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Supports transfer of use between two accounts (ie. re-credits the source account and debits the destination account). A positive value represents a transfer out, which increases the account balance; a negative value indicates that use is incoming and reduces the account balance (Figure 7). Volume transfered is a function of Order/Use Debit or Total Usage Water Year, see Table 2 for definitions.
Figure 7. Transfer use trigger
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Truncates a specified parameter of an account or account type to a specified ratio or volume of another parameter (Figure 8, see Table 2 for parameter definitions). For example, in Figure 8, the the total water for this account is limited to 50% entitlement. If the total water in this account is less than 50% entitlement, such as only 40% entitlement, then nothing is truncated, the total water in the account will remain as 40% entitlement.
Figure 8. Truncate total water trigger
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