Hydrogeology C

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Hydrogeology C

Postby SenseiSushi » September 6th, 2016, 1:52 pm

Short Event Description: Students will manipulate a groundwater computer model, answer questions about groundwater concepts, and evaluate solutions, based on hydrogeological evidence, to reduce anthropogenic effects on groundwater.

What percentage of water on Earth is potable?
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Re: Hydrogeology C

Postby tm-scioli » September 16th, 2016, 6:40 pm

for all fresh water it's
2.5%

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Re: Hydrogeology C

Postby tm-scioli » September 19th, 2016, 7:21 pm

Name 3 major aquifers in the US

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Re: Hydrogeology C

Postby Magikarpmaster629 » September 19th, 2016, 7:47 pm

tm-scioli wrote:Name 3 major aquifers in the US

Ogallala, Ozark plateau, and the Mississippi river valley aquifer

Since the answers to this are rather ambiguous, I'll go ahead and ask a question:

Give a basic definition of the term 'aquifer' and explain what properties make it different than something that isn't an aquifer.
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Re: Hydrogeology C

Postby tm-scioli » September 22nd, 2016, 7:19 pm

An aquifer is one or more geological strata that are water bearing and capable of transmitting water at an appreciable rate. An aquifer refers only to the zone where all pore spaces and interstices are saturated with water.

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Re: Hydrogeology C

Postby Magikarpmaster629 » September 22nd, 2016, 8:11 pm

tm-scioli wrote:An aquifer is one or more geological strata that are water bearing and capable of transmitting water at an appreciable rate. An aquifer refers only to the zone where all pore spaces and interstices are saturated with water.

I'd say that's mostly right. However, aquitards and aquicludes can also have pore spaces filled with water. The difference is, aquifers have high permeability which allows them to transmit water with a reasonable speed, whereas aquitards and aquicludes transfer the water slowly or not at all.

Go ahead.
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Re: Hydrogeology C

Postby tm-scioli » September 22nd, 2016, 9:34 pm

1. LNAPl vs. DNAPL
2. what is transitivity?

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Re: Hydrogeology C

Postby appleshake123 » October 10th, 2016, 12:52 pm

tm-scioli wrote:1. LNAPl vs. DNAPL
2. what is transitivity?


1. Lnapl is light non aqueous phase liquid(Less dense than water I guess) and Dnapls is dense non aqueous phase liquid(denser than water)
2. Do you mean transmitivity- the water flow rate in an aquifer? If not, guess I have to learn more.
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Re: Hydrogeology C

Postby tm-scioli » October 10th, 2016, 8:47 pm

Yeah, 2 is my bad. The correct spelling is transmissivity, and it's specifically the horizontal flow rate of water of the entire thickness of the aquifer (it's usually measured as hydraulic conductivity times thickness
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Re: Hydrogeology C

Postby choiireneus » November 11th, 2016, 7:10 am

I ran into a question regarding the time of a contaminant reaching other wells. The question was: Approximately how long will it take for the BTEX to travel from the source (well E) to the nearest well in danger of being contaminated? The answer was: 2-4 years. How am I supposed to solve this? Any expertise would be greatly appreciated! :D

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Re: Hydrogeology C

Postby tm-scioli » November 12th, 2016, 8:05 am

I'm not sure about the context, but the only time I've run into those questions have been when I've already calculated the groundwater velocity for part two. Otherwise, the only way I know of is to go back to part two and calculate everything again for that well.

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Re: Hydrogeology C

Postby Magikarpmaster629 » February 18th, 2017, 4:11 pm

Alright, let's reboot this thread.

What is the mathematical relationship between volumetric flow rate and cross-sectional area (aka directly or inversely related)? If I was to graph these quantities such that Q is on the y-axis and A is on the x-axis, what would the slope of such a graph be equal to, taking into account porosity?

Hint: Think about Darcy's Law
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Re: Hydrogeology C

Postby appleshake123 » March 2nd, 2017, 9:11 am

Magikarpmaster629 wrote:Alright, let's reboot this thread.

What is the mathematical relationship between volumetric flow rate and cross-sectional area (aka directly or inversely related)? If I was to graph these quantities such that Q is on the y-axis and A is on the x-axis, what would the slope of such a graph be equal to, taking into account porosity?

Hint: Think about Darcy's Law


Answer
Volumetris flow rate is directly proportional to cross sectional area. The slope, would be equal to(included effective porosity) the velocity*crosssectional area*effective porosity.
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Re: Hydrogeology C

Postby Magikarpmaster629 » March 3rd, 2017, 7:27 pm

appleshake123 wrote:
Magikarpmaster629 wrote:Alright, let's reboot this thread.

What is the mathematical relationship between volumetric flow rate and cross-sectional area (aka directly or inversely related)? If I was to graph these quantities such that Q is on the y-axis and A is on the x-axis, what would the slope of such a graph be equal to, taking into account porosity?

Hint: Think about Darcy's Law


Answer
Volumetris flow rate is directly proportional to cross sectional area. The slope, would be equal to(included effective porosity) the velocity*crosssectional area*effective porosity.

One problem: The slope is the volumetric flowrate over the cross-sectional area, so the slope would not be equal to v*cross-sectional area*porosity; just drop out the area term and it becomes v*effective porosity. Also acceptable for the slope is Ki, conductivity*gradient; this is the other side of the Darcy's law equation.

Your turn!
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Re: Hydrogeology C

Postby appleshake123 » March 3rd, 2017, 7:50 pm

Magikarpmaster629 wrote:
appleshake123 wrote:
Magikarpmaster629 wrote:Alright, let's reboot this thread.

What is the mathematical relationship between volumetric flow rate and cross-sectional area (aka directly or inversely related)? If I was to graph these quantities such that Q is on the y-axis and A is on the x-axis, what would the slope of such a graph be equal to, taking into account porosity?

Hint: Think about Darcy's Law


Answer
Volumetris flow rate is directly proportional to cross sectional area. The slope, would be equal to(included effective porosity) the velocity*crosssectional area*effective porosity.

One problem: The slope is the volumetric flowrate over the cross-sectional area, so the slope would not be equal to v*cross-sectional area*porosity; just drop out the area term and it becomes v*effective porosity. Also acceptable for the slope is Ki, conductivity*gradient; this is the other side of the Darcy's law equation.

Your turn!


Haha, that was a silly mistake on my part.
My initial answer was Ki but then I saw the "taking into account porosity" portion of it, so I changed it. I'm dumb, I wrote the other side of the equation instead of just the slope of the relation.


Name and describe three types of wells.
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