skip to main content
Objects and Methods : Aquifer : User Methods : Flow from Upstream
Flow from Upstream
These methods controls how flows into the aquifer are represented from the Upstream direction.
* No Flow
No flows enter the Aquifer from upstream. This is the default method in this category
* Compute Flow using Heads
This method computes the Flow from Upstream based on the difference in previous computational timestep heads and the conductance.
Slots Specific to This Method
 Flow from Upstream
Type: Series
Units: Flow
Description: The flow that occurs into this Aquifer from the upstream object, usually another Aquifer
Information: For this method, the slot will have values only at the computational timestep. Positive values indicate flow into this Aquifer.
I/O: Output only
 Conductance Upstream
Type: Scalar
Units: AreaPerTime
Description: The conductance from the upstream object to this Aquifer.
Information: The Conductance Upstream must be the same as the linked object’s Conductance Downstream.
I/O: Required Input
 Head Upstream Previous
Type: Series
Units: Length
Description: The head of the upstream object from the previous computational timestep.
Information: This slot will have values only at the computational timestep.
I/O: Output only
Method Details 
At run start the object will check if:
If so, an error is issued at run start. These two slots must be the same or water will be lost or gained between the two objects.
This method computes the flow into the Aquifer from the upstream:
Note:  This equation is applied at the computational timestep.
Revised: 01/11/2023