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Objects and Methods : Aquifer : User Methods : Flow from Above
Flow from Above
These methods control how flows into the aquifer are represented from the Above direction.
* No Flow
No flows enter the aquifer from above. This is the default method in this category
* Compute Flow using Heads
This method computes the Flow from Above based on the difference in previous computational timestep heads and the conductance.
Slots Specific to This Method
 Flow from Above
Type: Series
Units: Flow
Description: The flow that occurs into this Aquifer from the above 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 Above
Type: Scalar
Units: AreaPerTime
Description: The conductance from the above object to this Aquifer.
Information: The Conductance Above must be the same as the linked object’s Conductance Below.
I/O: Required Input
 Head Above Previous
Type: Series
Units: Length
Description: The head of the object above 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:
(5.1)    
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 above:
(5.2)    
Note:  This equation is applied at the computational timestep.
* Specify or Link Flows
This method uses the Flow from Above as specified (input or rules) or linked from an above groundwater object as described in Head Based Linked Percolation
Slots Specific to This Method
 Flow from Above
Type: Series
Units: Flow
Description: The flow that occurs into this aquifer from the above object, usually another aquifer.
Information: For this method, the slot will have values at the run timestep. Positive flows are into this aquifer object.
I/O: If not linked, it should be input or set by a rule. If linked, it is Output only.
Revised: 08/02/2021