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Exercise 7: Slug Test Analysis - Bouwer & Rice

This exercise is written with the assumption that you have gone through the first exercise, and are familiar with the AquiferTest interface.

This exercise is based on the slug test data published in Fetter, Applied Hydrogeology, 3rd Edition, 1994, p. 250.

[1] Launch AquiferTest 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] Create a new slug test by selecting Test > Create a Slug Test from the main menu. Select the Slug Test 1 from the Tests Frame:

 

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

In the Project Information frame:

Project Name: Exercise 7

Project No.: 7

Client: ABC

Location: Your Town

In the Slug Test frame:

Name: Hvorslev and Bouwer Rice Analysis

Performed by: Your Name

Date: filled in automatically

In the Units frame:

Site Plan: ft

Dimensions: ft

Time: s

Transmissivity: ft2/d

 

Remaining units are not used, and can be left as is.

[4] In the Wells table a well has been created automatically. Ensure the type is Test Well which can be chosen by activating the Type cell and then clicking to produce a drop-down menu.

[5] Enter the following information for the well:

Name: TW

R: 0.083

L: 10

r: 0.083

 

Your screen should look like the image below:

 

 

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

[7] 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.

 

Time

Water Level

0

14.87

1

14.59

2

14.37

3

14.2

4

14.11

5

14.05

6

14.03

7

14.01

8

14.0

9

13.99

 

[8] For the Static Water Level enter 13.99

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

[10] 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, as shown below

.

[11] Click on the Analysis tab

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

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

[14] 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.

[15] Click on the (Automatic Fit) icon, to fit the data to the type curve. The analysis tab should look like the image below:

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

[17] Once you are finished, the results in the Results frame of the Analysis Navigator panel should display the calculated conductivity value:

K = 8.37E1 ft/d (83.7 feet/day)

The following table illustrates a comparison of the conductivity value with those that are published reference.

Parameter

AquiferTest

Published*

Conductivity (ft/d)

8.37 E1

7.9 E1

                         *Fetter, 1994

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

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

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

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

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

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

[24] Enter a value of 10.0

[25] Return to the Analysis tab

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

[27] Click on the (Automatic Fit) icon, to fit the data to the type curve.

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

[29] Once you are finished, the Results frame of the Analysis Navigator panel will display the conductivity value:

K = 6.47 E1 ft/d (64.7 feet/day)

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

[31] 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 define your company information and logo in the Reports tab settings under Tools/Options.

 

[32] Check the boxes beside any other reports you wish to print.

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

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

 

This completes the Bouwer & Rice exercise. 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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