The well module, abbreviated as WEL, simulates volumetric rate discharge from a cell. The only input is the column, row, layer and rate of discharge in L3/T with units consistent to the other parameters entered in the model. A NEGATIVE rate indicates WITHDRAWAL and will result in drawdown. If your model indicates drawup, you probably forgot to include the negative sign in the well package.

EXERCISE 5: Add Pumping to the Model with the Well (WEL) package and Simulate Steady State Conditions with Pumping

1. In the equivalent directory that you are working in for the class problem, create directory C:\TEMP\YOURNAME\MODFLOW\exer\ex5

2. Copy my ex5_after_tutorial.gwv file there or move yours from gwvtut

3. Open GWV
File>Open Browse for C:\TEMP\YOURNAME\MODFLOW\exer\ex5
Select ex5.gwv
OK
 
 
4. Set the path to the working directory from Models>PathsToModels
at the bottom of the window that appears set the working directory to your version of C:\temp\yourname\modflow\exer\ex5
Print as much as possible to the output file for checking purposes
Models>MODFLOW>OutputControl
uncheck the Disable printing box
Models>MODFLOW>PrintFormats
print all relevant items for your problem
5. Add a well package to this model as unit 12, write budget terms to unit 20
Model>MODFLOW>Packages
Set the root name to exss5
Check the Well Package
Assign unit 12 to the well package
 
OK
6. File>SaveAs
ex5.gwv in C:\temp\modflow\exer\ex5
7. Create the WEL file
MODFLOW page 8-3
OR
MODFLOW96 pages 29-30
OR
MODFLOW2000 pages 69-70
OR
A > select the add a Well button
Click on row 9, column 10
Adjust the coordinates to 9500,9500, the screen top and bottom to layer 1, and enter the flow rate of -1
Repeat for layer 3
if you used this option you will see a dot on the screen representing the well

OR
BCs>Well
BCs>Insert>SingleCell
Click on row 9, column 10
Enter the flow rate of -1
Switch to layer 3
BCs>Insert>SingleCell
Click on row 9, column 10
Enter the flow rate of -1
if you used the last option your screen would look like:
8. Click the Calculator button
Yes to create files first
Yes to view error file
Yes to Process results
Check the path to the output files and correct as necessary before importing them
This step can cause problems because sometimes you think you are not getting the answer you expect but it is because you are looking at the wrong output files. This is the place to check that.
Correct the path for and Check the cell-by-cell flow files as well
OK
9. Evaluate the results
Find the new the wel file in your directory and view it. It should look like this: Well File
Peruse the MODFLOW output file, looking for conditions that you do not expect
View the heads
Plot>Contour>Parameters(Plan)
Choose reasonable contour information
Your map should look like:
(if the cross section does not look like this, set GWV to row 9 and layer 3) view other layers too
Does this make sense? If not, communicate with me
Check the Mass Balance
Plot>MassBalance>ModelSummary (below was run with sip, tol = 1e-5, max iter=500)


Does this make sense? If not, are some of the terms you expect to see missing? How is the mass balance? If you find problems, go to MODFLOW> Packages and check that the proper packages are included and the budget terms for each are being written to the budget file. If some of the items are missing, add them, create the files again, and rerun MODFLOW, then import the results with the flow terms checked. If you still have problems, write to me.
While you have gwv on row 9
View a cross section of the heads
Plot>Profile>Heads
Double Click on the Axis Labels
Visit both the x and y axis and use reasonable variables
Your plot should look like

Does this make sense? If not, communicate with me
Is flow upward or downward in the model? answer

10. Explore all aspects of this model
Does everything make sense?
If not, write to me
GO "BACK" to continue the transient exercise