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Define Observations

Observation wells can be added to the numerical model as follows.

 

First, import the observation well data as described in the Import Wells section.

 

The observation well data can be viewed/edited in the Data Table section.

 

Once you have the head observation data defined, navigate to the Define Observations step in the USG numerical model workflow.

 

 

 

 

Above the 3D Viewer, you will see the insert blue arrow; select your Head Observation Wells data object from the data explorer and click on the button. The observation wells should then appear in the 3D view as green points, and will also appear as a new node on the numerical model tree.  

 

The vertical position of the head observation will be determined by the Elevation value of the Head Observation point defined in the Wells Data Table.

 

Observation Groups

If you assign subsequent Observation Wells data objects from the data explorer will be prompted with a choice to append the observations to an existing well group or create a new well group.

 

 

 

View / Edit in CSV Format

The head and concentration observation data in an observation data group can be viewed/modified in a CSV format (once it has been created).

 

Right-click on a Head (or Concentration) Observations Group node from the Model explorer

Select "Edit Attributes..." as shown below.

 

 

The data contained inside the Observations data object will be displayed in a .CSV file; this should appear in either Notepad or Excel depending on your system configuration; an example is below:

 

 

You can use this interface for numerous types of edits/additions:

 

Adding a new observation point at a defined XY location

Change existing data

Add a new observation time to an existing observation point.

 

Please Note: Note that the Layer number for the observation point is calculated based on the Obs. Elev; changing the layer number will not change the vertical location of the observation point).

 

When you are finished with the edits in the .CSV file, you need to save and close this file.  Then re-import back the changes into Visual MODFLOW Flex using the steps below:

 

Right-click on the Head (or Concentration) Observations node from the Model explorer

Select "Reload Attributes..."

 

The modified data will now appear and will be utilized for any charts the next time you complete a translate and run of the model.

 

 


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