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jfusilloPE

Water Resources Study Module

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As promised (especially for you Undertaker), I have began scanning in class notes for the PE.

The water resources section is complete and available for use.

Shoot me a PM with an e-mail address and I will e-mail it to you. I broke it down into two files and they are PDFs.

Just let me know if you want it, because I think the files are a little too big to post here.

I will also be putting review questions up for each section as well.

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bump

Can someone pin this?

Thanks,

Joe

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First set of water resources problems...

Solutions to follow.

Edited by jfusillo

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As promised (especially for you Undertaker), I have began scanning in class notes for the PE.

The water resources section is complete and available for use.

Shoot me a PM with an e-mail address and I will e-mail it to you. I broke it down into two files and they are PDFs.

Just let me know if you want it, because I think the files are a little too big to post here.

I will also be putting review questions up for each section as well.

Your help is greatly appreciated. Here is my e-mail Hanisandiego@yahoo.com

Hans

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Solutions for the first set.

The solutions follow the methodology of the water resources notes that I have provided to you via e-mail.

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Great Job! Joe

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First set of water resources problems...

Dear Friend,

Would you give me "Water Resources Study Module"?

If so. this is my email: mtaher5@aol.com.

Please help me.

Sincerely,

Dil Tayeba

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As promised (especially for you Undertaker), I have began scanning in class notes for the PE.

The water resources section is complete and available for use.

Shoot me a PM with an e-mail address and I will e-mail it to you. I broke it down into two files and they are PDFs.

Just let me know if you want it, because I think the files are a little too big to post here.

I will also be putting review questions up for each section as well.

You can send the WR Module to csergei@gmail.com

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You can send the WR Module to csergei@gmail.com

Thanks for the help.

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Anybody have the solutions for the WR module?

Please post them or send to me when possible.

Thanks,

owillis

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Solutions to water resources study module

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Solutions to water resources study module

Could you post the solution to the monitoring well problem on page 7 of the solution set? I believe that solution is missing.

Thanks so much!

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I worked on this problem for a half hour last night and didn't get very far. I did find a similar problem but couldn't get the answer.

owillis28

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Could you post the solution to the monitoring well problem on page 7 of the solution set? I believe that solution is missing.

Thanks so much!

The answer is (D) S 45d W

If you take the casing top elevation and subtract the groundwater depth, you get an elevation of "X". Place those elevations with the appropriate monitoring wells and you can see the flow path.

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The answer is (D) S 45d W

If you take the casing top elevation and subtract the groundwater depth, you get an elevation of "X". Place those elevations with the appropriate monitoring wells and you can see the flow path.

Jfus,

Great post. Thank you for posting this set of problems.

In regards to the monitering well problem, can anyone post a detailed solution to this problem?

I used the information that joe had provided but still don't understand this problem.

Thank you in advance,

owillis

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As promised (especially for you Undertaker), I have began scanning in class notes for the PE.

The water resources section is complete and available for use.

Shoot me a PM with an e-mail address and I will e-mail it to you. I broke it down into two files and they are PDFs.

Just let me know if you want it, because I think the files are a little too big to post here.

I will also be putting review questions up for each section as well.

Please e mail to plt5@msn.com

Thank you

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Jfus,

Great post. Thank you for posting this set of problems.

In regards to the monitering well problem, can anyone post a detailed solution to this problem?

I used the information that joe had provided but still don't understand this problem.

Thank you in advance,

owillis

Here you go..

The idea is to draw the potential head lines (connecting equal groundwater levels) and the flow line will be perpendicular to it . I just draw the equipotential lines for 44m and 45m and flow will be perpendicular to that from 45m to 44m.

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Please email to tonny30064@yahoo.com

Thank you.

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I got a question on Fluid Dynamics question on Page 15.

why can't I use the mass balance equation here? I mean shouldn't the product of velocity and area be the same no matter what.

Solutions to water resources study module

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I got a question on Fluid Dynamics question on Page 15.

why can't I use the mass balance equation here? I mean shouldn't the product of velocity and area be the same no matter what.

The decrease in pressure from A to B requires an increase in velocity to keep the total energy equal... which, in this case, increases the flow at B.

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Can you please email me study material to mayureshsant@yahoo.com

THANKS

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Solutions to water resources study module

jfus

do you have the solution for the problem on page 18? I went to check my work and found I didn't have the solution. If anyone else has it, please post.

thanks

owillis

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Nevermind - I found my mistake.

owillis

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I got a question on Fluid Dynamics question on Page 15.

why can't I use the mass balance equation here? I mean shouldn't the product of velocity and area be the same no matter what.

I believe that the question in this problem is misleading. I did it correctly only because I saw that they gave pressures and it would have been easy enough to use the energy equation. However, in this situation, you've lost flow somewhere and the picture doesn't show there to be an oppurtunity to lose any flow. At any rate, that's why you can't use the continuity or mass balance...there is flow that is unaccounted for in this solution.

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I believe that the question in this problem is misleading. I did it correctly only because I saw that they gave pressures and it would have been easy enough to use the energy equation. However, in this situation, you've lost flow somewhere and the picture doesn't show there to be an oppurtunity to lose any flow. At any rate, that's why you can't use the continuity or mass balance...there is flow that is unaccounted for in this solution.

Jartgo,

I don't think the question is misleading. Maybe strange in that pressure decreases as a result of a constriction which seems counter-intuitive. Is there any real-world case where this can happen?

When talking about "lost" flow, I think most people visual fluid going somewhere different and there being a loss in mass. That's what you seem to imply above because you talk about there not being any opportunity to lose flow.

In this case, the flow *velocity* decreases. We know this has to happen because the pressure decreases and, in this problem, a decrease in pressure MUST be accompanied by an increase in velocity to keep the total energy equal. This also seems intuitive to me because I think of molecules getting further apart when pressure decreases and this implies there's less "stuff" passing by a point at any given time interval. Is this the principle behind the continuity equation which includes a term for mass density?

The problem says to ignore friction head loss, which if accounted for would further decrease the velocity in pipe B. And still, in the problem, the discharge through pipe B is less than in pipe A. This can ONLY happen at steady state if the density of the fluid increases. And we usually assume that density of water is constant even over significant changes in pressure. So I'm left to conclude the values given in the problem can only occur if it's not at steady state.

I would feel bad for the person that applied the continuity equation for liquids which says discharge at steady-state through any pipes in series is equal at all points - and decided the velocity at B was 63 fps. Luckily that's not a choice given!

Am I missing something important?

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