Exercise 3: Recovery Data Analysis - Agarwal Solution

This exercise demonstrates analysis of recovery data, using the Agarwal recovery solution. In addition, the Data Logger Wizard feature will be demonstrated.

Create the Pumping Test and Enter the Data

In this section of the Exercise, you will create a new Pumping test project:

[1] Launch AquiferTest and from the Welcome screen, ensuring that the "Create Pumping Test" box is checked, choose the "Create a new project" button.
If you already have AquiferTest open, create a new project by clicking the (New) button from the toolbar, or select File > New from the main menu.

[2] In the Pumping Test tab, enter the following information in the appropriate fields:

In the Project Information frame:

•Project name: Exercise 3: Agarwal Recovery

•Project No.: 3

•Client: ABC

•Location: Your Town

In the Pumping Test frame:

•Name: Agarwal Recovery

•Performed by: Your Name

•Date: filled in automatically

In the Units frame

•Site Plan: m

•Dimensions: m

•Time: s

•Discharge: m3/s

•Transmissivity: m2/s

•Pressure: mbar

In the Aquifer Properties frame

•Aquifer Thickness: 20 m

•Type: Unknown

•Bar. Eff. (BE): Leave blank
 

[3] The new project will contain one pumping well, by default. Set the parameters for this well as follows:

Well 1

•Name: PW

•Type: Pumping Well

•X: 0

•Y: 0

Next, create a new well. Click on the “Click here to create a new well” link to add a new well to the table. Define the parameters for this new well, as follows:

Well 2

•Name: OW1

•Type: Observation well

•X:10

•Y: 0

Your Wells grid should now look similar to the following figure:

[4] Click on the Discharge tab

[5] Select Constant discharge

[6] Enter the value 0.0015 in the "required" field beside

[7] Click on the Water Levels tab

[8] Highlight “OW1” in the wells list in the top left corner of the tab. For this well, you will import the time-water level data from a data logger file.

Import Data Logger Data

In this section of the Exercise, you will import the water level data from a data logger:

[9] Select File > Import > Import Data Logger file... from the main menu

[10] Browse to the folder “C:\Users\Public\Documents\AquiferTest Pro\Exercises\Supporting Files\" and select the Exercise3.asc file.

[11] Highlight the file and click Open. This will launch the 6-step data logger import wizard.

[12] In the first step, you may select  previously saved import settings. This is a great time saver when importing many files with similar format. Since there are no existing settings, you must define the required settings manually.

The first window also allows you to select the row from which to start importing. If you have headers in the first row you can start importing from row 2. There are no headers in this file so you can leave everything as it is.

[13] Click [Next].

[14] In Step 2, specify the delimiters. Un-check the box beside Tab and check the one beside Space.

[15] Click [Next].

[16] In Step 3, specify the Date column and the format in which the date is entered. Click on the first column to mark it as DATE and in the drop-down menu below choose Month Day Year. Use the default separator "/". Your screen should look similar to the one shown below.

[17] Click [Next].

[18] In Step 4, specify the Time column. Click on the header above the second column.

[19] Click [Next].

[20] In Step 5, specify the Water Level column. Click on the header above the third column. Use the default units of m (meters).

In addition, use the default co-ordinate system of Top of Casing Datum.

[21] Click [Next].

[22] In Step 6, there are options to specify the start time, and data filtering options. The data loggers usually record measurements at pre-set time intervals and as such, record many repetitive water level measurements. To import so much redundant data slows down the processing speed. The data can be filtered by time or by change in water level.
 

Select the radio button beside the By change in Water Level (m) and enter 0.01.
 

NOTE: You can save these import settings for future use by clicking the save button at the bottom left-hand corner of the wizard. You will be prompted to provide a name for these settings. Thereafter, these settings will be available to you in the DropZone when you need to import data files with the same structure.

[23] Click [Import] to finalize the import of the data logger file.

[24] A dialog box will appear, indicating 233 data points have been imported.

[25] Click [OK].

[26] Enter Static Water level as 2.0

[27] Click the Refresh button in the main toolbar, to refresh the graph. The calculated drawdown appears in the Drawdown column and a graph of the drawdown appears to the right of the data.

Pumping Test Analysis: Agarwal Recovery

To perform the data analysis:

[28] Move to the Analysis tab.

[29] Select OW1 from the Data from window

[30] In the Analysis Name field, type “Agarwal Recovery”

[31] Click the Apply Graph Settings dropdown menu in the Analysis toolbar and select the log-log option.

The graph below shows the Drawdown and recovery data.

[32] Check the box beside the Recovery period only under the Data from window and select Theis Analysis in the Analysis Method frame.  Your screen should look similar to the following:

NOTE:  an error will appear in the Status window in the lower right corner of the AquiferTest window and the analysis graph does not update to show only the recovery data since we have not explicitly specified the start of the recovery period.  Recovery test analysis requires that you define the time when the pumping stopped. To do this, use the variable discharge rate option as described below.

[33] Return to the Discharge tab

[34] Select Variable in the Discharge frame

[35] For this pumping test, the pump was shut off after 30,000 s. In the first row of the Time and Discharge columns type in 30,000 and 0.0015 in the Time and Discharge columns, respectively.

[36] Return to the Analysis tab

[37] You can see that the graph has refreshed, displaying only the recovery portion of the data. Click the Fit button, to fit the data to the type curve. The analysis graph should appear similar to below:

[38] Convert the Drawdown axis to a linear scale by unchecking the Logarithm option in the Drawdown frame in the Analysis Navigator panel.

[39] Click the Fit button to autofit the data to the type curve.

[40] As can be seen in the image above, the data fit the curve quite well; however, if you wish you can use the Parameter Controls to manually adjust the curve fit.

[41] The calculated parameter values should be similar to the following:

•Transmissivity = 5.01 E-4 m2/s

•Storativity = 1.17 E-5

Printing the Report

In this section of the Exercise, you will print the report of your analysis:

[42] Print the desired reports by selecting the Reports tab and checking the boxes beside the reports you wish to print (e.g. Agarwal Recovery under Agarwal Recovery > Analysis Graphs > Agarwal Recovery.

NOTE: You can add your company information and logo to the space in the upper left of the report page(s) by selecting Tools > Options from the main menu and adjusting the settings in the Reports tab.

[43] Click on the (Print) button in the tool bar, or select File > Print from the main menu.

[44] Save your project by selecting File > Save As, and define a project name (e.g. Example 3.HYT).

This concludes the exercise. The next exercise will demonstrate an analysis of multiple pumping wells in a confined aquifer. You have the option to exit the program or to continue on to the next exercise.

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