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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: 

• An available Available resource is calculated during a defined water year;  
• Allocation of the resource is made to different account types; 
• Each account type’s allocation are is distributed between accounts linked to this account type; and
• Any allocated water that has not been carried over at the end of the defined water year will be returned to the available resource for allocations of next year.

An annual accounting system set up in Source follows these principles.

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Enabling annual accounting

Firstly, create an annual accounting system as follows:

• Choose Edit » Resource Assessment... to open the Resource Assessment Explorer; and
• Right click Resource Assessment and choose Add Annual Accounting Annual Accounting.

In the top Annual Accounting level, you can:

• Configure annual accounting using the Configuration tab;
• View summary information of all accounts added with the Accounts tab;
• Set the available resource vs allocation table using the Allocation tab; and
• Set trigger priority with the Trigger Priority tab.

The next sections provide further details of all the tabs listed above.

Configuring an annual accounting system

This tab provides an overview of the annual accounting system (as shown in Figure 1

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This creates a default annual accounting system. The Start Of Water Year Trigger item triggers the resource assessment and allocation process. More details can be found in the Add Trigger section below.

The next sections explain the contextual menu items when you right click on the annual accounting system.

Add Off-Allocation System 

This creates an off-allocation system. Refer to the Off Allocation node for more information.

Add Account Type

An annual accounting system may contain several account types. Each account type can also include many accounts. Right click on each account type to reveal the following contextual menu:

Add account - Set number of shares, initial account balance and previous usage. Previous usage can be set up as a function. Select the water user to link the account to in associated account host. The associated account lists all the water user nodes built in the project. Each account can have only one water user associated with it. 

Figure 6. Configuring Accounts

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Once the number of shares are set, go to the schematic editor window, right click the water user and choose “edit” to open the editor window. Click Distribution from the left hand panel, then click account sharing from the right hand panel. Details of account distribution and supply point will be shown. Unit shares will automatically be shown here if they were set in the resource assessment panel. Debit Type is also got automatically from configuration of annual accounting. Priority and Share Ratio are editable here.

Priority 1 is the highest level. The share ratios of Accounts with the same priority level should sum to 100%. More details can be found in the user guide Water User Node.

Add trigger

Triggers can be added at any level under Annual Accounting. Right click the account and choose Add trigger. A trigger initiates or cancels certain actions for an account and can be configured using the properties panel shown in Figure 5. Users can also edit functions for a trigger. For example, if “Function” is chosen for trigger configuration, a function is needed to initiate an action. The format of a function should be like this:  “IF A>B, 1, 0”, where “1” indicates the action will occur and “0” means the action will not happen.

An account can have several triggers, each can be designed to initiate a particular action.  Right click trigger, users can choose rename or delete to rename or delete this trigger from the drop-down menu. After triggers are set up, users can set triggers’ priorities by moving them up and down in Trigger Priority. 

Add usage limit

Right click the account or account type and choose Add usage limit, see Figure 4. Users can limit water usage for all accounts by absolute volume or per-unit-share for moving water year or movable time window (Figure 4). An account can have several usage limits, each can be designed to initiate a particular limit. Right click usage limit, users can choose rename or delete to rename or delete this usage limit from the drop-down menu.

Configuration of Account Type

When account, trigger and water usage limit are all set up, you can go back to account type to configure and see summary information of all added accounts. 

Click Account Type on the left hand panel, and make sure the configuration tab is selected on the right (Figure 2), set debit type, priority, minimum and maximum balance, minimum and maximum volume. If they are non-debit accounts, you need to tick the box Enable non-debit accounts, and then the availability threshold and repayment threshold become editable.

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). The required parameters are explained in Table 1.

Figure 1. Annual Accounting, Configuration

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Table 1. Annual accounting, Configuration tab

Accounts

This tab provides a summary of all the accounts in the annual accounting system. As shown in Figure 2, you can add or delete accounts using the corresponding buttons below the Accounts table. Each of the parameters in the Accounts table is explained in Table 2.

Figure 2. Annual Accounting, Accounts tab

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Table 2. Annual accounting, Accounts tab

To add an account in the table, click Add Account below the Accounts table to open the Add New Account dialog (shown in Figure 3) and add an account in the table. To associate an account with a host, click on the individual account below the Account type. The section on the far right lists all the associated account hosts available in the scenario. Then, click on the required host.

Hosts in a scenario may consist of water users, bulk licensing nodes or an environmental demand node. 

 Figure 3. Annual accounting, Accounts tab, Add New Account

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Allocation

The Allocation tab shows the quality of resources required to achieve the specified allocations, including provision for carryover. Configuration of the Resource and Account Type columns depends on the how the Account type has been configured, in particular the Method to apply for this account type in ARA table parameter. Figure 4 shows how the ARA table varies with this parameter and Table 3 explains the variations.

The columns shown in the Figure 4 are:

• Resource - The water available in the system;
• Carryover - The proportion of water that is carried over to the next water year; and
• There is an additional column for each Account Type, and it is configured as shown in Figure 1.

Figure 4. Annual accounting, Allocation tab

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Table 3. Annual accounting, Allocation, Variations

Trigger Priority

Figure 5 shows the Trigger Priority tab. Priorities are separated into two: Timestep Beginning and Timestep End. You can re-order the priority of triggers.

Figure 5. Annual accounting, Priority Trigger

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The next section deals with how to configure the different items shown in Figure 1.

Adding an off-allocation system 

Off-Allocation Systems are assigned at the top Annual Accounting level. To add an off-allocation system, right click Annual Accounting and choose Add Off-Allocation System. Refer to the Off Allocation node for more information.

Account Type

An annual accounting system may contain several account types (as defined by you). Each account type can also include many accounts. To add an account type, as shown in Figure 1, right click on the annual accounting system and choose Add Account Type.

In the Account Type level, you can use the:

• Configuration tab to configure the account type (shown in Figure 6);
• Accounts tab to view a summary of all accounts in the account type; and
• Non-Debit Accounts tab to view and configure all non-debit accounts in the account type.

The next section describes each of these tabs.

Configuring an account type

Figure 6 shows the configuration parameters required for an account type. These are explained further in Table 4.

Figure 6. Annual accounting, Account type, Configuration

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Table 4. Annual Accounting, Account Type, Configuration

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Figure 7 Configuring Allocation Calculation Model

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Function You set the function at this level. 

Monthly varying You can set the calculation method as either interpolate or threshold. 

Percent (with Function) This is similar to percent (with linked volume), difference exists at the annual accounting level allocation page which is discussed somewhere. 

Percent (with linked volume) The default option for method to apply for this account type in ARA table. You can set Announced Increment, Maximum Announced Percent and Shares. If Use Shares from Accounts is ticked, Shares will get value automatically from account shares which is set at the account (rather than the account type) level. 

Volumetric. You will need to set the volume at the annual accounting level allocation page which is discussed somewhere.

Accounts summary at Account Type Level

Clicking on the Accounts tab beside configuration at the top of the right hand panel (Figure 7), will show all the accounts created under this Account type.

You can also add an account simply by click the Add Account button below the list, or delete an account by selecting the account that to be deleted and clicking the Delete Account button. The Unit Shares and Initial Balance values are transferred automatically from the account but can also be edited here (Figure 7b).

Figure 7b. Accounts Summary Tab

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Add an Off-Allocation System

Off-Allocation Systems are assigned at the top Annual Accounting level. Right click annual accounting and choose add off-allocation system from the drop-down menu. An off-allocation system can be configured using the properties panel shown in Figure 13. Detailed information of off-allocation system can be found under Off-Allocation Node

Configuration of Annual Accounting and Summary of accounts, allocation and trigger Priority

After account type and triggers are set up, you can go back to annual accounting to

• configure annual accounting
• see summary information of all accounts added 
• set the available resource vs allocation table 
• set trigger priority.

Figure 7c. Annual Accounting Configuration

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Configure Annual Accounting

Click Configuration on the top of right hand panel. For option parameters:

• Owner: Users can set owner from Edit » Ownership..., right click resource assessment form the left hand panel and choose Enable Ownership from the drop-down menu. Users can edit details of owner from the owners table. Once ownership system are set up, users can choose any owner from the drop-down menu beside Owner in Figure 7c.
• Debit Type: determines how water is deducted from all the accounts based on either order or use
• Start of Water Year:  Day-month that the water year starts for the system.
• Usage to Date: represents how much of the water allocated has been ordered or used by water users in the water year to date. There are two options for usage to date - usage from function and usage from account host. When losses need to be considered, an expression may be required to account for this.

The storage window lists all the water storage in the project. Users can tick any storage type they want to run in this project.

The Inflow window lists all the inflow in the project. Users can also tick any inflow they want to run in this project. The recession factor of each inflow can be edited by a constant or a function manager.

Users can also set Other Resources and Commitments by click the line under the Name of these two windows and a constant value or a function will also be available for editing the resources or commitments that added.

Accounts Summary

Accounts can be managed at Annual Accounting or Account Type levels. 

Allocation

Click Allocation beside accounts on the top of right hand panel, Available Resource Versus Allocation displays below (Figure ?). The appearance of Allocation depends on the choice of method to apply for this account type in ARA tablein configuration of Account Type, The ARA table will display as the variations below (Figure ?). 

• If function was chose in Method to apply for this account type in ARA table before, the Resource in the table will calculate automatically based on the function that was set at the Account or Account Type level
• If Monthly Varying was chose in Method to apply for this account type in ARA table before, users need to set the date for resource calculations. The calculation method was already chosen at an Account Type level, either interpolate or thresholds. Click the number below the Account Type name, the monthly varying window will display as in Figure ??. Users can set resource of each monthly manually or by import or export data from the Import andExport button below. If interpolate is chosen for calculation method, the Resource of the first column will calculated automatically based on current and next month values. More details about interpolate can be found in SRG. Ifthreshold is chosen, Resource of the first column will get value automatically form current month.
• If Percent (with Function) was chose in Method to apply for this account type in ARA table before, “Function” below the account type is editable because functions of this method cannot be set at a lower level.
• If Percent (with linked volume) was chose in Method to apply for this account type in ARA table before, the account type has a unit of (%) and the account type column can be editable by typing number directly to the table. Then the Resource column will calculated automatically based on account shares times percentage.
• If Volumetric was chose in Method to apply for this account type in ARA table before, the account type has a unit of (ML) and the rural column can be editable by typing number directly to the table. Then the value in Resourcecolumn is equal to that in Account Type column.

Figure ? Allocation summary 

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Figure ?? Monthly Varying Allcoation Window
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Trigger Priority

Click Trigger Priority on the top of right hand panel, the trigger priority page is shown as Figure ???. The triggers will be separated into two types based on “timestep begining” and “timestep End”. For each type or triggers, users can choose the trigger and move it up or down to set the priority for this trigger.

Figure ??? Trigger Priority screen

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Table 5. Input parameters for the ARA Table options.

Accounts

Choose the Accounts tab to view a summary of all the accounts configured in the account type. The Accounts table is similar to that shown in Figure 2, with parameters summarised in Table 2.

Non-debit accounts (for NSW)

This tab allows you to work with Non-debit accounts. Enable the Enable Non-Debit Accounts checkbox, which allows you to edit the remaining parameters (as shown in Figure 7). These are:

• 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;
• Carry-Over 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 Calc Method; and
• Balance Calc Method - choose either Murray or Murrumbidgee. This will affect the value assigned to the first two parameters.

Figure 7. Annual accounting, Account type, Non-Debit Accounts

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Once an account type has been created, you can create the following using the contextual menu (as shown in Figure 1):

• Accounts
• Triggers; and
• Usage limits

These are explained in further detail next.

Adding an account to an account type

To add an account to an account type, you must configure Number of Shares, the Initial Account Balance and Previous Usage parameters (as shown on the left side of Figure 7). To link the account to a host, choose the water user, Bulk licensing or Environmental demand node under Associated Account Host. The associated account host column lists all the available nodes in the project. Once these have been configured, you will notice that the value configured for the Number of Shares relates to the Demand distribution item of the water user node (shown on the right side of Figure 7). Refer to Demand distribution for details on configuring the water user node. Notice also that the Account Distribution table (in the node's feature editor) shows details of the resource assessment system.