Ordering priorities allow users in Source to specify how shortfalls are prioritised between different demands in Source. Previously, Source tried to shortfall all demands equally within the model, this functionality provides a solution to address situations encountered in water resource models such as the following:
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| Anchor | ||||
|---|---|---|---|---|
|
Scenario | Allow Order | Extract Water | Notes |
1 | True | True | Standard case |
2 | True | False | Just restrict the extraction in the flow phase |
3 | False | True | Water will be extracted independently of the priorities |
4 | False | False | Nothing occurs |
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If Inclusive of Orders = True Then
It acts like a minimum flow node and we will need to adjust ratios
If Inclusive of Orders = False Then
It acts like a supply point and is generating an additional order
Gauge Node, Straight Through routing, lagged routing, Off allocation
Pass through the priority array
Inflow Node, Loss Node, Hydraulic Connecter Nodes & Storage Routing Links
Pass through the priority array, noting that order volumes are most likely going to change. Assume that any change in orders are required to meet downstream and are shared across the priorities. I guess this assumes that if the highest priority has 50% of the order then 50% of the associated loss/gain are associated with delivery of the water. This assumption may have some holes but keeps it simple for now. As priority shortfalls are independent of ownership it should have minimal impact.
Transfer of Ownership
The transfer of ownership has two options regarding ordering priorities
- Maintain downstream ratio
- Override ratios and assign to one priority level (re-prioritise orders)
Storage
Evaporation based orders...
operating target based orders...
Two options at a storage node that have an impact on the prioritisation of orders
Pass Orders Through – simply sum the volumes at each priority level across all outlets and divide by total volume being passed up all outlets to get proportions, assume evap/seepage does not effect storage ratios
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