Exercise 7: Slug Test Analysis - Bouwer & Rice

This exercise demonstrates how to perform a slug test analysis in AquiferTest using the Hvorslev (1951) and Bouwer & Rice (1976) methods. The slug test is based on data published on page 250 of Applied Hydrogeology by Fetter (1994).

For more information about Slug Tests, please see Slug Test Solution Methods and related subtopics.

This exercise is written with the assumption that you have gone through the Quick Start Demo Tutorials, and are familiar with the AquiferTest interface.

[1] If you have not already done so, double-click the AquiferTest icon to start an AquiferTest session.  At the Welcome page ensure that the "Create Slug Test" box is checked and choose the "Create a new project" button.  
 

[2] Complete the fields for the Slug Test as follows:

Project Information frame:

•Project Name: Exercise 7

•Project No.: 7

•Client: ABC

•Location: Your Town

Pumping Test frame:

•Name: Hvorslev and Bouwer Rice Analysis

•Performed by: Your Name

•Date: fills in automatically

Units frame:

•Site Plan: ft

•Dimensions: ft

•Time: s

•Discharge: US gal/min

•Transmissivity: ft2/d

•Pressure: mbar

Aquifer Properties frame:

•leave the default values.

Your fields should now look similar to the figure below:

[3] In the Wells table a blank well record has been created automatically. Ensure the type is Test Well which can be chosen by activating the Type cell and then selecting the desired entry in the drop-down menu.

[4] Enter the following information for the well:

•Name: TW

•R: 0.083

•L: 10

•r: 0.083

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

[5] Click on the Water Level tab to enter the water level data for the test well.

[6] For the Static Water Level enter 13.99

[7] For the WL at t=0 enter 14.87

[8] In this exercise you will enter the data manually. Type in the following information using Tab key or arrow keys to move from cell to cell.

[9] 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, as shown below:

.

[10] Click on the Analysis tab

[11] In the Analysis Name type in Hvorslev. Notice that this name now appears in the Analyses frame of the Project Navigator panel

[12] From the Analysis method frame of the Analysis Navigator panel choose Hvorslev:

[13] If necessary, alter the Max and Min values for both axes so that the graph fits comfortably on the page. The time axis should range from 0-10 seconds, and the drawdown axis should range from 0.01 to 1.

[14] Click on the Fit icon to auofit the data to the type curve. The analysis tab should look similar to the image below:

[15] If you are not satisfied with the fit of the line, use Parameter Controls to adjust it. The line can be moved up/down by left-clicking and dragging the line.  You can also rotate the line about the Y-intercept by right-clicking and dragging the mouse pointer up/down. You can always return to the autofit values by clicking the Fit button.

[16] Once you are finished, the results in the Results frame of the Analysis Navigator panel should display the calculated conductivity value (83.7 ft/day):

[17] For this slug test data, you can also perform the Bouwer & Rice analysis.

[18] Create a new analysis by selecting Analysis/Create a New Analysis from the main menu:

[19] In the Analysis Name field, type Bouwer & Rice. Notice this name now appears in the Analyses frame of the Project Navigator panel

[20] Select Bouwer & Rice from the Analysis Method of the Analysis Navigator panel

[21] A warning message will appear, indicating “Missing Parameter: Aquifer Thickness”:

[22] Return to the Slug Test tab and locate the Thickness field in the Aquifer Properties frame

[23] Enter a value of 10.0

[24] Return to the Analysis tab

[25] Select “Bouwer & Rice” in the Analysis frame of the Project Navigator panel

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

[27] If you are not satisfied with the fit of the line, use the Parameter Controls or the mouse to adjust it.

[28] Once you are finished, the Results frame of the Analysis Navigator panel will display the conductivity value (64.7 ft/day):

The following table illustrates a comparison of the estimated conductivity values with the published reference:

[29] To print your reports go to the Reports tab

[30] Expand the navigator tree, and select the box beside “Bouwer & Rice” under Analysis Graphs. The Reports tab should look like the image below:

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.

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

[32] Save your project by selecting File > Save As, and define a project name (e.g. Example 7.HYT).

This concludes the exercise on slug test analysis using the Hvorslev and Bouwer & Rice methods. The next exercise will deal with the Butler High-K slug test analysis method. This method is an appropriate solution for the analysis of slug tests performed in partially penetrating wells in formations of high hydraulic conductivity where oscillating effects are usually encountered in drawdown data. You have the choice of exiting AquiferTest or continuing on to the next exercise.

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