FE Exam Review - FE Civil/Environmental - Water Resources - Groundwater Flow
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- Опубліковано 22 лип 2020
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I love your videos! I'm about to take the FE a year after graduating and these are helping me jog my memory on what I learned in the prior years
Hi Nicholas! I am happy to hear that! With enough practice, patience, and determination you will definitely starting recalling these concepts learned in school. Keep it up!
Hello, in the cross-section sketch you drew, the 220' and the 205' should be 195' and 175' respectively. The well head should be above the water table. so we subtract 220'- 25' =195' and 205'-30' = 175'. Can you please verify? Thank you.
Interesting...
In the diagram at the bottom, the well head elevation from the reference point for A should be 220 ft right? Not 210?
Yes! Sorry about that. Thank you for catching that.
I got problem kind of like this on the enviromental FE that I'm trying to figure out if I got right. The difference is that there were four pizo tubes in a square around a centralized well. Each pizo tube had a specific head height associated with it. And you were asked which way the flow would go. No other information was given. Just the heads. I picked the one with the highest head.
Hi Kevin, this sounds interesting!
Water will always flow from high head to low head. The greatest difference in head would dominate the direction of flow in this case.
@@directhubfeexam Thank you. Just to make sure I understand. Since the elevations were all the same from pizo tube to pizo tube. All the information I had was the head height. And they did tell me the center well was the equpotienial the direction of flow would be the greatest difference in head.
Does the well head elevation mean the elevation from sea surface (or any datum) to the top of the well? And if so, wouldn't the equipotential lines = Well Head Elevation - Depth to Groundwater
Hi Abdullah, your first statement is correct from what I know.
So equipotential lines are lines that have "equal potential" (i.e. lines of constant head). I doubt they will ask you to draw these on the FE exam but if you had to:
Let's say you have 3 wells:
(1) Draw lines connecting wells
(2) Note elevation at each well
(3) Map distances between wells
(4) Note difference in elevations
(5) Find distance for a unit head drop between wells
(6) Mark even increments
(7) Repeat for all the well pairs
(8) Create the equipotential contour lines
(9) Draw the normal to these lines (this is the direction of flow)
Hope this helps, this isn't really my area of expertise - just helping for the FE exam.
So I'm trying to draw a cross section like you did but I'm having trouble wrapping my head around it.
At first (before playing your video) I drew it like this: This made sense to me, water flowed down hill.
-- 220'
| -- 210'
| | -- 205' Surface
| | |
| | |
| | |
-- 25' -- 20' |
|
|
-- 30' Groundwater level
But you're saying it should look like this: I am struggling to understand how the groundwater would be lower in the middle but still flow NE.
______ Surface
| \ __________
| \____/ |
| 25' | 20' | 30'
| | |
| | |
-- 220' | |
| -- 210' |
| | -- 205'
| | |
------------------------------------ Datum
Could you please explain it? (Thank you for making these videos by the way, very helpful!)
Sorry for the delayed response. Your question was always in the back of my mind.
Here is how I fixed this in the course:
snipboard.io/bwiXqp.jpg
@@directhubfeexam Thank you, that does make sense I think, but where did you get the numbers?
@@chotta7733 Crap, I forgot I changed the problem inside the course to test my students who watched this youtube video already. Here is the problem statement from the course:
snipboard.io/8enab0.jpg
Thank you for your patience.