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Exercise 6: Adding Barometric Correction

NOTE: Barometric correction tools are only available in the AquiferTest Pro edition.

This exercise will demonstrate how to add a barometric correction to the observed drawdown data. As with the previous exercise, the AquiferTest project has already been created for you. The exercise assumes that you are familiar with the AquiferTest interface. If not, please review Exercise 1.

[1] Start AquiferTest and click on the (Open other project...) button, or if AquiferTest was already started then select File/Open from the main menu.

[2] Browse to the folder "C:\Users\Public\Documents\AquiferTest Pro\Exercises\", and select the project: Barometric.hyt

[3] Click [Open]

The pumping test consists of one fully penetrating pumping well, pumping at 0.001 m3/s for 30.000 s. Drawdown is observed at an observation well located 10 meters away.

[4] Once the project has loaded, go to the Analysis tab and the Analysis Graph.  Take note of the Transmissivity and Storativity values in the Results frame of the Analysis Navigator panel

 

[5] Return to the Pumping Test tab and click on the button beside the Bar. Eff. field

The following dialog will appear

[6] Click on the Click here link above the table and browse to the folder
"C:\Users\Public\Documents\AquiferTest Pro\Exercises\Supporting Files", and locate the file press-vs-wl.txt, which contains the pressure and water level data. This data was collected before the test.

[7] Click [Open] to import the file

As the data loads into the table, the graph appears to the right of the table and barometric efficiency (B.E.) is calculated and displayed below the graph. If this does not occur, click the Click here link below the graph to refresh the display. The calculated barometric efficiency is 0.60.

[8] Click [OK] to close this dialog, and notice that “0.60” now appears in the Bar. Eff. field in the Aquifer Properties frame in the Pumping Test tab.

[9] Return to the Water Levels tab. Add a Barometric correction to Well 2, by clicking on the “down” arrow beside the Add data correction button, and selecting Barometric Correction.

The following dialog will appear

 

[10] Click on the Click here link above the table and browse to the folder
"C:\Users\Public\Documents\AquiferTest Pro\Exercises\Supporting Files" and locate the file time-vs-pressure.txt, which contains the time vs pressure data. This data was collected during the test. The data will load into the table, and plotted on the graph window on the right side of the window, as shown below.

 

[11] Click [OK] to close the dialog, and apply the correction. Two new columns will appear in the Water levels table - Barometric correction and Corrected drawdown used in analysis, as shown below:

(For this example, the original water level is modified to show the trend and barometric effect. The time was simply multiplied by 3.)

[12] Now, return to the Analysis tab.

[13] Click on the (Automatic Fit) icon, to fit the data to the type curve. Take note of the new aquifer parameter values.

[14] A Barometric Analysis report may be printed from the Water Level branch of the navigator tree in the Reports tab. Click the Reports tab and expand the report tree. Select the Barometric Data report. This report will display the trend data with corresponding graph, and the t-test statistics. An example is shown below

 

This completes the exercise. The next exercise will deal with the Hvorslev slug test analysis. You have the choice of exiting AquiferTest or continuing on to the next exercise.

 

 


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