Annual accounting is a custom assessment method for regulated water in the resource assessment module. The related water user, bulk licensing or environmental demand nodes must be configured consistently with the resource assessment system. The general principles for an annual accounting system are:
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| Note: The Method to apply for this account type in ARA table drop-down menu has several options available (as shown in Figure 6), each with a different set of input parameters, explained in Table 6. The option chosen here affects the view in the Allocation tab for the annual accounting system (Figure 4), and are described in TABLE Y |
Table 6. Input parameters for the ARA Table options.
| Method | Input parameters |
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| Function | Enter a function using the Function Editor. |
| Monthly varying | Choose the appropriate Calculation Method - either Interpolate or Threshold. |
| Percent (with function) | Configure the following parameters:
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| Percent (with linked volume) - default | Same parameters as Percent (with function). |
| Volumetric | Volume. |
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This tab allows you to configure several parameters related to carryover, such as spill and its associated parameters (Figure 7). Spill is water released in excesss of the downstream requirements. Table 7 explains the configuration parameters.
Figure 7. Annual accounting, Account type, Carryover
Table 7. Annual accounting, Carryover parameters
| Item | Description |
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| Max Carryover | This is the maximum amount of water that can be carried over. It can be defined in terms of:
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| Maximum Effective Allocation | The maximum amount of water that an account can hold, including allocation and carryover. If enabled, you must define effective allocation in the Limit field. For example, if you specify 130%, allocation plus carryover water cannot exceed 130% of the entitlement. The carryover is not reduced; the allocation is restricted, preventing allocation plus carryover from exceeding 130% of entitlement. |
| Carryover Type | Select the type of carryover to configure using the drop-down menu:
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| Do Not Carry Over Spillable Water | If enabled, spillable water will not be available for carryover. If disabled, any remaining spillable water will be carried over to the next water year. |
| Spillable Volume Calculation Method | Spillable water is calculated using one of two methods:
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| Spillable | Allows you to trigger the account to spill. You can specify a boolean function to switch account spilling on or off. |
| Basis of Spilling | There are three options available:
If different account types under the same spill source have the same priority, then the priority of spilling from account types with Emptied on Spill or Pre-Release first, followed by Equalise Spillable Carryover Proportions and Reduce pro-rata last. |
| Water Available While Spillable |
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| Spill Reduction Priority | The priority of spill from the carryover account. The default value is 1, which is the highest priority. 2 is the next highest priority, then 3 and so on. During a spill, all accounts of the same priority are grouped together and the spill volume is distributed among these accounts pro rata. Any remaining spill is then passed along to the next priority grouping. |
| Use Account Type Spill Volume | When enabled, allows you to specify a value for Account Type Spill Volume. This volume will be used instead of the Spill Volume set at the top Annual Accounting System level (set on the Configuration tab, see Table 1.) |
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This tab allows you to work with non-debit accounts. First enable the Enable Non-Debit Accounts checkbox., which allows you to edit the remaining parameters (Figure 8). Parameters are explained in Table YY.
Figure 8. Annual accounting, Account type, Non-Debit Accounts
Table YY. Annual accounting, Account type, Non-Debit Accounts
| Item | Description |
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| Enable Non-Debit Accounts | Toggle on to edit the other parameters in this tab except for Per Share Upper Limit. |
| Use Per Share Upper Limit?? | Enable to enter value into Per Share Upper Limit, which defines the maximum amount of non-debit water that may be used. The smaller of the Repayment Threshold and the Per Share Upper Limit will be used. |
| Availability Threshold | The allocation level at which the water user gets access to the account. |
| Repayment Threshold | The allocation level at which repayments need to be made. As the water user approaches its maximum allocation, repayments need to be made. |
| Carryover Discount | A discount implemented on the water that is carried over to the following water year. Note that this applies only when Murrumbidgee is chosen as the Balance Calculation Method. |
| Balance Calculation Method | Choose either Murray or Murrumbidgee. This will affect the value assigned to the first two parameters.?? determines which set of rules to use. Upper Namoi is modelled by selecting the Murrumbidgee rules and enabling the Use Per Share Upper Limit. |
Accounts
Accounts allow a water user to request resources. They specify the entitlement that a particular water user has for that particular account type. The entitlement is used to apportion the available water between the accounts when new water allocations are made.
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Figure 9. Annual accounting, Account type, Add account
Table 8. Annual accounting, Account type, Account parameters
| Item | Description |
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| Entitlement | Entitlement volume assigned to the account. |
| Initial Allocation | Allocation on the first day of the model run. |
| Initial Account Balance | As its name suggests, this is the initial account balance of the system (corresponds to Initial Balance in Figure 2 and Figure 3). |
| Initial Carryover Scalar | Used to reduce the carryover commitment. The product of the carryover scalar and carryover start of water year is the carryover commitment at the start of the model run for the account. The carryover scalar is reset to 0 at the beginning of each water year, and increased as resources allow the commitment to be met (in accordance with the ARA table). |
| Carryover Start of Water Year | The amount of water carried over from the water year prior to the water year that the run commences in. |
| Previous Usage | The amount of usage between the start of the water year that the run commences in, and the first day of the model run. |
| Previous Spill from CarryOver | The amount of spill reduction from the carryover account between the start of the water year that the run commences in, and the first day of the model run. This is zero if the model run commences on the first day of the water year. |
| Associated Account Host | This lists all available account hosts in the model. Account hosts can be water user, bulk licensing or environmental demand nodes. To associate an account host with this account select it from the list. A host can only be associated with one account per account type, so a host that already has an associated account will not appear in the list. Once these have been configured, this association is reflected in the host node's feature editor, which can be used to configure the distribution between associated accounts and carryovers, as follows:
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| Note: Each account can have only one host associated with it. Each host can only have one associated account per account type. |
Triggers
Triggers specify events that affect the behaviour of the annual accounting system, such as allowing you to reassess accounts during the water year, or cancel XXX. Triggers can be added to an annual accounting system, an account type or an account. To add a trigger, right-click on the component and choose Add Trigger. This will create the trigger and display the dialog where you can define and configure it, see Types of triggers. Once you have created triggers, you can configure their priority using the Trigger Priority tab for the annual accounting system, see Trigger Priority.
Usage limit
Accounts and account types may have limitations placed on their usage that are independent of their allocation (or account balance). This dichotomy may occur because the allocation relates to a water year, and the usage limitation relates to multiple years or a moving time period.
Usage limits can be added to an account type or an account. To add a usage limit, right-click on the component and choose Add usage limit, then configure the usage limit using the dialog (Figure 9, Table DD). An account can have several usage limits, each can be designed to initiate a particular limit.
Figure 9. Annual Accounting, Usage limit
Table DD. Annual Accounting, Usage limit parameters
Item | Description |
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| Period | Time period that the limit applies to - Moving Water Year, Moving Window or Water Year. If a usage limits relates to a single water year, choose Moving Water Year and set Years to 1. Where a "rolling years" usage limit has been defined in IQQM for general security accounts, these should be defined as Moving Water Year limits in Source. |
| Quantity | Specify if the limit is Proportion of Entitlement or an Absolute Volume. To replicate IQQM, set this parameter to Proportion of Entitlement. |
| Years | For a moving water year, enter the number of years the usage limit applies to. For a moving window, define the number and time units (eg. days) that the usage limit applies to. |
| Quantity | Usage limit over the period that is to be applied to all accounts, as either Proportion of Entitlement or Absolute Volume. |
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