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Order supply path
The account or owner will determine the water source and delivery path used for the order at the supply point.
- Account sharing water users: Orders can be provided from any storage associated with the ordering account’s RAS. The order system determines where to source water from according to storage levels and other constraints at each time-step during the model run. Off allocation requests are always supplied from the off-allocation sharing (OAS) nodes associated with the supply point’s off-allocation accounts (if it has any).
- Non-account sharing water users: Any storage the ordering owner has a share of water and outlet capacity in can supply orders.
When there are multiple supply path options, the water ordering system determines where to source water from according to storage levels and other constraints at each time-step during the model run. For more information on how the water ordering system directs orders to storages:
- Refer toRules Based Ordering; or
- Refer to NetLP - SRG for this type of ordering.
Updating Account balance for Water 'Use'
When account sharing is used at a water user node, the node has accounts that are debited for water ‘usage’. This usage may be for water extraction or delivery at its supply point(s), depending on whether the use is extractive or not. The timing of debiting an account and the amount debited depends on whether its RAS type is ‘order debit’ or ‘use debit’, and on whether the associated supply point is extractive or not. Note that a groundwater or unregulated river supply point must be extractive and, if it is associated with an account, the account is use-debit.
The method of account balance update is outlined in Table 26 below.
Table 3. Updating account balances at supply points
| Supply point type | Account category | Account updates |
|---|---|---|
| Extractive | Order-debit | Account is debited for the volume of the associated ‘release’ from the nearest supply source (in terms of delivery time). This is done in the order phase of the time step in which the order is placed. If some of the flow ordered is not delivered, the account is refunded as the excess order is considered to be an operating error. |
Off allocation | Account is debited for the volume of off-allocation water extracted. | |
Use-debit | Account is debited for the volume of extraction for ‘regulated use’ for which orders have been placed using use-debit accounts. This excludes the use of overbank and off-allocation water to meet use-debit requirements. | |
| In-stream | All | The modeller can specify the total amount to deduct from all the supply point’s accounts and the timing of the deduction via a function. The default behaviour (when no function defined) will be as per extractive supply points - but the ‘extraction’ in this case is the part of the current requirement assigned to the account. |
The rationale for allowing the modeller to define an expression for account debiting at in-stream supply points is that these have differing applications. In-stream supply points can be used to place orders to ensure flow for a downstream location, such as a wetland, so account debiting should not necessarily occur at the time the flow arrives at the supply point but perhaps instead when the water arrives at the downstream location. There may also be variations to how accounts are debited - e.g.,. in the case of bulk water entitlements.
Input data
Details on data are provided in the Source User Guide for the Supply point node and in the ownership section Ownership at nodes and links.
Output data
Output Some output that may be displayed in the form of graphs, tables and statistics for the variables listed in Table 6.
Table 6. Recorded variables - Supply point
Attribute | Description | Units | Range | ||||
|---|---|---|---|---|---|---|---|
Upstream flow for each owner | Flow volumes upstream of the supply point node during each model time step for a particular owner. | volume | Real numbers ≥ 0 | Extraction for each owner | Extraction volumes at the supply point during each model time step attributed to an individual owner. | volume | Real numbers ≥ 0 |
Downstream flow for each owner | Flow volumes downstream of the supply point node during each model time step for a particular owner; e.g. after an extraction. | volume | Real numbers ≥ 0 | ||||
Total upstream flow | Total flow volumes (all owners) at each model time step upstream of the supply point node. | volume | Real numbers ≥ 0 | ||||
Total | upstream in-bank downstream flow | Total | in-bank flow volumes | (all owners) during each model time step | upstream of the supply point node.volume | Real numbers ≥ 0 | |
Total upstream in-bank flow available | Total in-bank flow volumes available for extraction (all owners) during each model time step upstream of the supply point node. | volume | Real numbers ≥ 0 | ||||
Total upstream overbank flow | Total overbank flow volumes (all owners) at each model time step upstream downstream of the supply point node. | volume | Real numbers ≥ 0 | ||||
Total extraction | Total extraction volumes (all owners) at the supply point during each model time step | volume | Real numbers ≥ 0 | Total downstream flow | |||
Overbank extracted volume | Overbank flow volumes | during at each model time step | downstream of extracted at the supply point node. | volume | Real numbers ≥ 0 |