CGN 6933
Groundwater Engineering
Fall 2019 semester
Instructor: J.A. Cunningham (cunning@usf.edu)
Note that all course materials are copyrighted and are intended only for the personal use by students registered in the class.
Documents may not be distributed without the written consent of the course instructor.
These files are usually PDF format but sometimes other formats (Word, PowerPoint, etc.) may be used.
Syllabus and course information
∙ Class syllabus
Homework assignments
∙ Homework 1 is due on Thursday, September 5.
∙ Homework 2 is due on Tuesday, September 17.
∙ Homework 3 is due on Tuesday, September 24.
∙ Homework 4 is due on Tuesday, October 1.
∙ Homework 5 is due on Thursday, October 17.
∙ Homework 6 is due on Thursday, October 24.
∙ Homework 7 is due on Thursday, October 31.
∙ Homework 8 is due on
Thursday, November 14. This is a fun
one!
Update for homework 8: it turns out that the residence time in the PRB is much
greater than the required 20 days. Next
time I give this assignment, I will modify some of the parameters to make it
more realistic/interesting.
∙ Homework 9 is due on Thursday, November 21.
∙ The last assignment is homeowrk 10. It is due on Tuesday, December 3.
Exams and quizzes
∙ Here is the midterm exam from 2019 along with my solution set.
Other documents and figures
∙ For class lectures, I have generated some figures of different scenarios that we have discussed. Here I can post some of these figures.
∙ If we install a well in an unconfined aquifer and we extract water, we’ll get a “cone of depression” in the vicinity of the well. This can be modeled analytically. Here is a figure showing the height of the water table in the vicinity of the well.
∙ A “flow net” shows the streamlines and the equipotentials (lines of constant head) for a particular scenario. Here is a flow net for an extraction well that extracts water from an aquifer which normally has regional flow towards the northeast. You can see the “branch cut” (horizontal line) which often appears when we graph flow nets with wells – it is Matlab’s way of telling us that there is a point singularity at the well, where the water is withdrawn from the aquifer.
∙ Lakes that are hydraulically connected to the groundwater can act as net sinks or net sources. It is often the case that one side of the lake feeds the groundwater, while the opposite side of the lake is fed by the groundwater. Here is a flow net for a lake that is hydraulically connected to the groundwater.
∙ The exponential integral function is used in the Theis solution for transient drawdown near a well. A graph of the exponential integral function can be used for "curve matching" to interpret data from a pump test. Here is a graph of the exponential integral function, W(u), versus 1/u...but if you want to use this graph for curve matching, you must make sure that the data are graphed on axes with the same spacing!
Site created: 20 August 2019
Last modified: 26 June 2023