# Analysis of a Constant-Rate Pumping Test in a Confined Aquifer

If you have AQTESOLV v4.0 or higher, you should perform an updated version of this tutorial found in the Quick Start chapter of the **Help file** installed with the software.

Walton (1962) presented data for an eight-hour, constant-rate pumping test in a nonleaky confined aquifer conducted July 2, 1953 at Gridley, Illinois. The discharge rate maintained in Well 3 was 200 gallons-per-minute (gpm). Drawdown was monitored in Well 1 located 824 ft from the pumped well. The reported thickness of the sand and gravel aquifer is 18 feet.

Start the AQTESOLV application (v. 3.0 or higher) and follow the steps below.

- Choose
**File>New**and select**Pumping Test Wizard**from the list to create a new data set for a pumping test. Click**OK**to proceed with the Pumping Test Wizard. - Enter units of measurement as shown and click
**Next**. - Enter project information as shown and click
**Next**. - Enter aquifer data as shown and click
**Next**. - Click
**Next**twice to skip the steps for fractured aquifer data. - Enter pumping well information as shown. The default X and Y coordinates place the pumping well at the center of the coordinate system. Click
**Next**. - Choose the option for a
**Fully Penetrating Well**as shown and click**Next**. - Enter pumping rate data in the spreadsheet as shown. Click
**Next**. - Enter observation well data as shown and click
**Next**. - Choose the option for a
**Fully Penetrating Well**as shown and click**Next**. - Enter the following time and displacement measurements into the spreadsheet for observation data. You can copy the data shown below and paste it into AQTESOLV for Windows using the Windows clipboard.
3 0.3

5 0.7

8 1.3

12 2.1

20 3.2

24 3.6

30 4.1

38 4.7

47 5.1

50 5.3

60 5.7

70 6.1

80 6.3

90 6.7

100 7

130 7.5

160 8.3

200 8.5

260 9.2

320 9.7

380 10.2

500 10.9 - Click
**Finish**to complete the Pumping Test Wizard. - If you entered all of the data into the Pumping Test Wizard correctly, the
**Error Log**displayed on the screen should show no errors in the data set. If the Error Log identifies any mistakes, you can correct them by choosing options from the**Edit**menu. - Choose
**File>Save As**to save your work. Choose a folder and enter**Gridley Well No. 1**for the name of the file. AQTESOLV for Windows saves the data set with an .aqt extension. - Choose
**View>Derivative-Time**to view a derivative plot of the data. Smooth the derivative data by choosing**View | Options**and clicking the**Derivative**tab. Select the option for**Smoothing**and enter a factor of**2**. Click**OK**. The form of the derivative plot for this data set is indicative of radial flow in a confined aquifer. - Choose
**Match>Solution**and select**Confined - Theis (1935)**from the list. Click**OK**. AQTESOLV for Windows displays the Theis solution on the derivative plot. Note that prior to estimating the values of T and S for the aquifer, the solution and the data on the derivative plot have the same shape. - Choose
**View>Displacement-Time**to display the Theis type curve and data. Right click the mouse over the plot and select**Log**to display the plot with log-log axes. - Choose
**Match>Automatic**and click**Estimate**to estimate aquifer properties using automatic estimation. When the estimation procedure has finished, click**OK**and then**Close**to close the summary window. Click**OK**to view the new position of the type curve with the estimated values of T and S. - Choose
**Match>Visual**if you would like to fit the curve using visual matching. Move the mouse over the plot. Click and hold the left mouse button down to drag the type curve to a new location.