FE Exam Review - FE Civil/Environmental - Groundwater - Darcy's Law

[@kevinkruger6233]

An interesting problem I got recently on the FE Environmental is called a 3 point problem where they have you solve for the hydraulic conductivity. I was having trouble determining the hydraulic gradient. It seems the length between wells has to be determined with the equipotential lines. Maybe the distance between.Might be a good video to put together

[@directhubfeexam]

Hi Kevin! Did you check out this problem? kzbin.info/www/bejne/iajck2xsZdKpqsk It’s the same process. They’d have to give you the distances between wells to find the hydraulic conductivity

[@ni5439]

If the aquifer doesn't have an uniform thickness, how do you calculate the area? Do you use an average thickness from different measurements along the aquifer?

[@pinkie224]

is there any significance to the problem stating that the soil profile is homogeneous and isotropic?

[@directhubfeexam]

Hi David, good question. This simply means the hydraulic conductivity value will be constant for the whole aquifer profile (homogeneous) AND the hydraulic conductivity will be constant in all directions (x,y,z) - (isotopic).

[@joseh7612]

What's the difference between Darcy's law and transmissivity?

[@btalib369]

Why we used Darcy low???

[@tessngochi3558]

I am also confused as to why we didn’t use Dupuit's Formula from the handbook

[@nelsonhuezo5385]

You don't have the data for the pumping wells.

[@ricardoarturolaraperaza9988]

@@nelsonhuezo5385 exactly.

[@carankatemanalo3725]

where is this equation in the FE handbook?

[@directhubfeexam]

Darcy's Law - pg. 291 FE Handbook 10.1

[@happyluv6]

what happened to the negative in the equation?

[@ricardoarturolaraperaza9988]

The negative is because Dh is actually 41m-76. Remember the water always flow from higher ground to lower. So. the difference should be actually h2 - h1 therefore dh= -35m

[@陳霈軒-w7k]

@@ricardoarturolaraperaza9988 Thanks!