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Exercise 3: Recovery Data Analysis - Agarwal Solution

This exercise demonstrates analysis of recovery data, using the Agarwal solution, new to AquiferTest. In addition, the Data Logger Wizard feature will be demonstrated. This exercise assumes that you are familiar with the program interface; feel free to return to Exercise 1 for the basics on navigating AquiferTest.

[1] Launch AquiferTest and from the landing page ensure that the "Create Pumping Test" box is checked and 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 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

 

[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.

[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.

[23] Click [Import].

[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 on the (Refresh) button in the 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.

[28] Move to the Analysis tab.

[29] Select OW1 from the Data from window

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

[31] 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:  the screen 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 cells of the Time and Discharge columns type in 30000 and 0.0015 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 on the (Fit) icon, to fit the data to the type curve. The analysis graph should appear similar to below:

 

 

[38] Change the Scale of the Drawdown axis to “linear”

[39] Press the Fit button to perform autofit to the data.

 

 

[40] The data and the curve fit quite well together, 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

 

[42] Print the desired reports by selecting the Reports tab and checking the boxes beside the reports you wish to print.

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

[44] Save your project by clicking on the (Save) icon or selecting File/Save as from the main menu.

 

This concludes the exercise. The next exercise will deal with multiple pumping wells. You have the choice of exiting AquiferTest or proceeding to the next exercise.

 

 

 


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