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- Account Type - Lists the account types available by default in a continuous accounting system;
- Allocation Priority - Determines the order in which account types will be credited during a resource allocation; and
- TOL Share - defines the TOL allocations for each eligible system account type.
- TOL Min Share - if the TOL falls below TOL min, water will be borrowed from the users to restore TOL to at least this level. Water is borrowed from the lowest priority users first.
Although the TOL Min Share is restricted to a minimum of zero by the Source function, TOL is still possibly going to negative. In this situation, a general waning message will be displayed in Log Reporter. The user need to pay attention to Log Reporter, and then can turn this scenario off or change (e.g. to a warning) via the Assurance Rules. This issue may arise if the TOL is not large enough to cover delivery losses (e.g. during dry periods where tributary inflows are low and hence delivery losses are high).
Allocation priority can be edited within an account class (ie high-security types can be rearranged using allocation priorities) however, errors will be generated if priorities are rearranged outside of a class (eg. a general security type is set higher than a high security type).
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The storage loss reserve (Figure 4) is a volume which is required to account for expected evaporation and seepage losses from the storage. The reserve is debited from the available resource prior to making any other allocations. It may be made a function of the current storage volume or area, which can be specified using an expressiona function. A minimum percentage of the required reserve that must be maintained can also be specified; restrictions are applied to general security accounts (or lowest priority account type) to achieve the required minimum reserve.
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High Security Groups (Figure 5) define the reserve which is required for high security users (may also be referred to as essential supplies). The high security reserve requirement may be defined using two groups - a higher and lower priority group. In the case where only one group is required, you can delete the other by right clicking on the item and choosing Delete. Additional groups may also be added (right click on the Continuous Accounting system and choose the desired system to be added). This can be specified as a fixed value or as an expressiona function. The latter can be used where there are rules that vary the high security reserve requirement.
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Item Name | Description |
|---|---|
High Security Reserve Requirement | Defines the required reserve. May be an expressiona function. |
Required Reserve Below Which Borrowing Occurs | The percentage of required reserve below which borrowing occurs from general security accounts. |
Time series allocation to accounts | If selected, the Allocation to accounts field is enabled, which allows you to define the allocation using an expressiona function. |
Simulate Allocations to accounts | Enables the Using Account Rules table. Account allocations are automatically calculated. |
Using Account Rules | Choosing Interpolate results in the allocation rate being determined based on interpolation between the specified rows. If you choose Thresholds, HS Reserve Met in the allocation table is treated as a threshold that has to be exceeded for the allocation rate to apply. |
Allocation to accounts | Defines the allocation to accounts per share in that High Security group. |
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- Time Series Allocation - Enables the entry of a function for allocating to the GSS;
- Simulate Allocation - Define an expression a function to allocate to GSS. The value of the expression function is treated as a volume to be added to the GSS account subject to available water limitations; and
- Total Volume Initial Balance - Initial balance in the GSS account.
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