Figure 1. Supply Point node
|Note: Only one of the effluents from a supply point node must connect to a water user node.|
Supply point configuration
Enabling the Extract water checkbox will ensure that the supply point extracts water. If disabled, water will not be given to the water user, and it will be passed downstream. This is the only difference between enabling and disabling the checkbox. Disable the Extract Water checkbox for demand models which require a flow at the supply point, but require the flow to remain in-stream, ie., the order will not actually be extracted. This could be used for shepherding environmental releases, for example.
Note: The supply point will only have an affect on the minimum constraint if extract water is enabled.
The Groundwater checkbox signifies the supply point as a groundwater pump. It will be used only when there is demand and there is no available regulated, supplementary water, or water from on farm storage to satisfy demand. You must set the maximum extraction rate (ML/day) for groundwater sources. When Groundwater is enabled, the supply point node icon changes to indicate groundwater extraction (Figure 2).
Figure 2. Supply point node, groundwater extraction
Enabling the Allow Orders checkbox essentially means that the supply of water to the water user is regulated. This will affect water distribution if account sharing has been set up in the Water user node. Refer to Account sharing (full Source version only);
Add Orders to Downstream Orders
This option only applies to non-extractive supply points and is available when Extract Water is unchecked and Allow Orders is checked. (The supply point behaviour becomes similar to a minimum flow node). When the supply point extracts water, this checkbox is forced on, as the water ordered does not make it downstream. In some circumstances, such as when tracking water entitlements, you may wish to only have the order required to make up the total on top of downstream orders to be attributed to the supply point, not the entire amount flowing past, as the downstream water users will already have those orders attributed to them. If the water user requires water, the water user requirement is added to the downstream orders.e.g Downstream of the supply point there is currently a 20ML order, the water user requires 30ML, the supply point will order 30ML and the total ordered volume upstream will be 50ML. When this option is unchecked it will only order the difference between the downstream order and water user requirement.
Use Unregulated Flow to Satisfy Orders
When this option is checked the forecast unregulated water (minimum expected flow - minimum constraint) is considered to be available and the supply point will only order the difference.