Pls. see my answer in the gwmodel group.

Peter

--- In feflow@..., "hydrogeomatt" <matt_d_webb@...> wrote:
>
> I am constructing a model in FEFLOW that contains an unconfined recharge zone
and an extensive confined region. What is the best way to go about replicating
this and what effect would choosing one assumption over the other actually have
on the calculations?
>
> I thought that defining the model as confined would result in strange
conditions in the recharge zone where the water table is not expected to reach
the top of the aquifer. Choosing unconfined would rectify that problem in the
recharge zone but what effect would it have on the results for the confined
region?
>
> Thanks,
>
> Matt
>

I am constructing a model in FEFLOW that contains an unconfined recharge zone
and an extensive confined region. What is the best way to go about replicating
this and what effect would choosing one assumption over the other actually have
on the calculations?

I thought that defining the model as confined would result in strange conditions
in the recharge zone where the water table is not expected to reach the top of
the aquifer. Choosing unconfined would rectify that problem in the recharge zone
but what effect would it have on the results for the confined region?

Thanks,

Matt

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Please ignore, and My sincere apologies if this is a repost !

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It is a wonderful resource, already use it quite a bit

Dr B

2009/7/5 Shaan W. <myshaan_80@...>:
> Greetings to you all,
>
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>
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>
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.html
>
> Thanks for your time!
>
> Sincerely,
> The Publisher,
> http://free-gis-data.blogspot.com
>
> Note: This site will be updated with more and more free GIS stuff daily, so
please keep visiting in future…
>
> Please ignore, and My sincere apologies if this is a repost !

Greetings to you all,

This excellent online Directory contains free, full text, quality controlled
scientific and scholarly journals. There are now 3,833 journals in the
directory. Currently 1,365 journals are searchable at article level. As of today
2,52,055 articles are included in the Directory of Open Access Journals service.

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Note: This site will be updated with more and more free GIS stuff daily, so
please keep visiting in future…

Please ignore, and My sincere apologies if this is a repost !

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Dear M Chopra,
Can you send these case studies to me at gmuj@...
Thanks you in advance...

Best Regards,
Ghulam Mujtaba

Hi dear friends,

Please if anyone have an example or case study of fleflow, and modflow

thank

I will really appreciate.



2009/6/12 sangzela <zelasailo@...>

>
>
> dear manish..
>
> can u also send me the case study u have done, it is very difficult to get
> examples on feflow problems..
>
> regards
> zela sailo
>
> From: "prince_geomurugan@... <prince_geomurugan%40yahoo.co.in>" <
> prince_geomurugan@... <prince_geomurugan%40yahoo.co.in>>
> To: feflow@... <feflow%40yahoogroups.co.in>
> Sent: Friday, 12 June, 2009 5:51:26 PM
> Subject: Re: [feflow] applications of feflow
>
> Hai Manish chopra.....
>
> I need case study example using FEFLOW.. If possible please send it soon in
> prince_geomurugan@ yahoo.co. in it will help to my studies.
>
> --- On Wed, 13/5/09, manish chopra <manish_cjonty2006@ yahoo.co. in>
> wrote:
>
> From: manish chopra <manish_cjonty2006@ yahoo.co. in>
> Subject: Re: [feflow] applications of feflow
> To: feflow@yahoogroups. co.in
> Date: Wednesday, 13 May, 2009, 4:02 PM
>
> Hi Marielena Lucen.....
>
> Sorry for replying so late. I am having some case studies which i have done
> using FEFLOW. If you are still in need of those, let me know. i will send
> those to you.
>
> Regards,
>
> Manish Chopra
>
> --- On Thu, 19/2/09, marielenalucen <malenalucen@ gmail.com> wrote:
>
> From: marielenalucen <malenalucen@ gmail.com>
>
> Subject: [feflow] applications of feflow
>
> To: feflow@yahoogroups. co.in
>
> Date: Thursday, 19 February, 2009, 8:13 AM
>
> hi everybody
>
> i desperate need a tutorial or some applications or examples using
>
> feflow, please if some have a file in pdf or word about this please
>
> send it to malenalucen@ gmail.com
>
> Thank you
>
> Marielena Lucen
>
> Hydraulic Engineer
>
> Peru

Good Day...

You may like to refer my technical report entitled "Modelling of a Coastal
Aquifer using FEFLOW" available at

http://www.nih.ernet.in/report/Goa.pdf

Regards
Kumar
==================================================
C. P. KUMAR
Scientist 'E1'
National Institute of Hydrology
Jal Vigyan Bhawan
Roorkee - 247667 (Uttarakhand)
INDIA

Web Page : http://www.angelfire.com/nh/cpkumar/
==================================================


--- In feflow@..., sangzela <zelasailo@...> wrote:
>
> dear manish..
>
> can u also send me the case study u have done, it is very difficult to get
examples on feflow problems..
>
> regards
> zela sailo
>
>
>
> From: "prince_geomurugan@..." <prince_geomurugan@...>
> To: feflow@...
> Sent: Friday, 12 June, 2009 5:51:26 PM
> Subject: Re: [feflow] applications of feflow
>
> Hai Manish chopra.....
>
> I need case study example using FEFLOW.. If possible please send it soon in
prince_geomurugan@ yahoo.co. in it will help to my studies.
>
> --- On Wed, 13/5/09, manish chopra <manish_cjonty2006@ yahoo.co. in> wrote:
>
> From: manish chopra <manish_cjonty2006@ yahoo.co. in>
> Subject: Re: [feflow] applications of feflow
> To: feflow@yahoogroups. co.in
> Date: Wednesday, 13 May, 2009, 4:02 PM
>
> Hi Marielena Lucen.....
>
> Sorry for replying so late. I am having some case studies which i have done
using FEFLOW. If you are still in need of those, let me know. i will send those
to you.
>
> Regards,
>
> Manish Chopra
>
> --- On Thu, 19/2/09, marielenalucen <malenalucen@ gmail.com> wrote:
>
> From: marielenalucen <malenalucen@ gmail.com>
>
> Subject: [feflow] applications of feflow
>
> To: feflow@yahoogroups. co.in
>
> Date: Thursday, 19 February, 2009, 8:13 AM
>
> hi everybody
>
> i desperate need a tutorial or some applications or examples using
>
> feflow, please if some have a file in pdf or word about this please
>
> send it to malenalucen@ gmail.com
>
> Thank you
>
> Marielena Lucen
>
> Hydraulic Engineer
>
> Peru

dear manish..

can u also send me the case study u have done, it is very difficult to get
examples on feflow problems..

regards
zela sailo



From: "prince_geomurugan@..." <prince_geomurugan@...>
To: feflow@...
Sent: Friday, 12 June, 2009 5:51:26 PM
Subject: Re: [feflow] applications of feflow

Hai Manish chopra.....

I need case study example using FEFLOW.. If possible please send it soon in
prince_geomurugan@ yahoo.co. in it will help to my studies.

--- On Wed, 13/5/09, manish chopra <manish_cjonty2006@ yahoo.co. in> wrote:

From: manish chopra <manish_cjonty2006@ yahoo.co. in>
Subject: Re: [feflow] applications of feflow
To: feflow@yahoogroups. co.in
Date: Wednesday, 13 May, 2009, 4:02 PM

Hi Marielena Lucen.....

Sorry for replying so late. I am having some case studies which i have done
using FEFLOW. If you are still in need of those, let me know. i will send those
to you.

Regards,

Manish Chopra

--- On Thu, 19/2/09, marielenalucen <malenalucen@ gmail.com> wrote:

From: marielenalucen <malenalucen@ gmail.com>

Subject: [feflow] applications of feflow

To: feflow@yahoogroups. co.in

Date: Thursday, 19 February, 2009, 8:13 AM

hi everybody

i desperate need a tutorial or some applications or examples using

feflow, please if some have a file in pdf or word about this please

send it to malenalucen@ gmail.com

Thank you

Marielena Lucen

Hydraulic Engineer

Peru




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[Non-text portions of this message have been removed]

Hai Manish chopra.....

I need case study example using FEFLOW.. If possible please send it soon in
prince_geomurugan@... it will help to my studies.



--- On Wed, 13/5/09, manish chopra <manish_cjonty2006@...> wrote:

From: manish chopra <manish_cjonty2006@...>
Subject: Re: [feflow] applications of feflow
To: feflow@...
Date: Wednesday, 13 May, 2009, 4:02 PM

Hi Marielena Lucen.....

Sorry for replying so late. I am having some case studies which i have done
using FEFLOW. If you are still in need of those, let me know. i will send those
to you.

Regards,

Manish Chopra 



--- On Thu, 19/2/09, marielenalucen <malenalucen@ gmail.com> wrote:



From: marielenalucen <malenalucen@ gmail.com>

Subject: [feflow] applications of feflow

To: feflow@yahoogroups. co.in

Date: Thursday, 19 February, 2009, 8:13 AM



hi everybody



i desperate need a tutorial or some applications or examples using

feflow, please if some have a file in pdf or word about this please

send it to malenalucen@ gmail.com



Thank you



Marielena Lucen

Hydraulic Engineer

Peru

Greetings to you all,

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sincere apologies, not sure how I managed to repost Peters reply to the group

Dr B

2009/5/22 John C Bullas <john.bullas@...>:
> --- In feflow@..., "peter.schaetzl" <p.schaetzl@...> wrote:
>>
>> Hello,
>>
>> DHI-WASY (the manufacturer of FEFLOW) can provide free FEFLOW licenses
>> for selected PhD students for the time of the PhD study.
>>

--- In feflow@..., "peter.schaetzl" <p.schaetzl@...> wrote:
>
> Hello,
>
> DHI-WASY (the manufacturer of FEFLOW) can provide free FEFLOW licenses
> for selected PhD students for the time of the PhD study.
>
> Qualicfication includes that
> - the topic of the PhD thesis is interesting to DHI-WAY
> - the focus of the work is clearly research-oriented
> - the research is leading-edge work
> - a summary of the thesis may be published by DHI-WASY.
>
> If you fulfill these criteria, please apply for such a license with a
> short (about one page) description of your planned work.
>
> Best regards,
> Peter Schätzl
>
> Product Manager FEFLOW
> DHI-WASY
>

With FEFLOW, I experienced stability problems with models with
- an irregular mesh --> try the Smooth mesh tool;
- too high conductivity differences (elements with 10-8 m/s conductivity
adiacent to ones with 10-3 m/s) --> do what you can to "smooth" the conductivity
distribution.

May the 200 days of maximum time steps be tied to the power functions governing
the transient conditions? Considering you are simulating 10000 years... Good
luck!

Giovanni Formentin





--- In feflow@..., Giovanna Monti <giovanna.monti@...> wrote:
>
> Hi,
>
> There are problems of stability.
> You should check the model before running it.
>
> I suggest a couple of checks:
>
>  at first run the model in steady state and check if it converges and that the
balance (IN-OUT) is fine for your problem, otherwise you have to control your
input, the number of layers vs deep, mesh etc
> then I would rehash the steady state solution and I would run the new model in
transient conditionif that does not work, I would check again the mesh near well
points and verify how the model works without wells.Hoping this will help you!
>
> Don't quit!
>
> Giovanna Monti
> environmental engineer
> Washington DC
>
>
> --- Mer 13/5/09, manish_cjonty2006 <manish_cjonty2006@...> ha scritto:
>
> Da: manish_cjonty2006 <manish_cjonty2006@...>
> Oggetto: [feflow] to reduce model run time
> A: feflow@...
> Data: Mercoledì 13 maggio 2009, 12:42
>
>
> Hello everyone...
>
> I am doing groundwater flow and contaminant transport modeling for saturated
region with transient conditions. I am doing it for 1.0xE4 years. while doing
that i am facing two problems
>
> 1.Head values at some of the observation wells are oscillating 10-15 metres
>
> 2.Time step is not going beyond 200 days so it is taking so much time for
running. I am using automatic predictor corrector method.
>
> i would like you all to give your suggestions so that i can resolve thee
problems.
>
> Thanks.
>
> Regards,
> Manish Chopra
>

Gio's advice is good. The problem may lie with conflicting boundary
conditions or bc constraints, which may or may not show up in the steady
state. Another possibility is the mode used, phreatic, confined, etc.
"Free and Movable" slices can be unstable. More information is needed to
make useful comments on the actual problem.

*Pete*

www.aquageo.us


Giovanna Monti wrote:
>
>
> Hi,
>
> There are problems of stability.
> You should check the model before running it.
>
> I suggest a couple of checks:
>
>  at first run the model in steady state and check if it converges and
> that the balance (IN-OUT) is fine for your problem, otherwise you have
> to control your input, the number of layers vs deep, mesh etc
> then I would rehash the steady state solution and I would run the new
> model in transient conditionif that does not work, I would check again
> the mesh near well points and verify how the model works without
> wells.Hoping this will help you!
>
> Don't quit!
>
> Giovanna Monti
> environmental engineer
> Washington DC
>
> --- Mer 13/5/09, manish_cjonty2006 <manish_cjonty2006@...
> <mailto:manish_cjonty2006%40yahoo.co.in>> ha scritto:
>
> Da: manish_cjonty2006 <manish_cjonty2006@...
> <mailto:manish_cjonty2006%40yahoo.co.in>>
> Oggetto: [feflow] to reduce model run time
> A: feflow@... <mailto:feflow%40yahoogroups.co.in>
> Data: Mercoledì 13 maggio 2009, 12:42
>
> Hello everyone...
>
> I am doing groundwater flow and contaminant transport modeling for
> saturated region with transient conditions. I am doing it for 1.0xE4
> years. while doing that i am facing two problems
>
> 1.Head values at some of the observation wells are oscillating 10-15
> metres
>
> 2.Time step is not going beyond 200 days so it is taking so much time
> for running. I am using automatic predictor corrector method.
>
> i would like you all to give your suggestions so that i can resolve
> thee problems.
>
> Thanks.
>
> Regards,
> Manish Chopra

Hi,

There are problems of stability.
You should check the model before running it.

I suggest a couple of checks:

 at first run the model in steady state and check if it converges and that the
balance (IN-OUT) is fine for your problem, otherwise you have to control your
input, the number of layers vs deep, mesh etc
then I would rehash the steady state solution and I would run the new model in
transient conditionif that does not work, I would check again the mesh near well
points and verify how the model works without wells.Hoping this will help you!

Don't quit!

Giovanna Monti
environmental engineer
Washington DC


--- Mer 13/5/09, manish_cjonty2006 <manish_cjonty2006@...> ha scritto:

Da: manish_cjonty2006 <manish_cjonty2006@...>
Oggetto: [feflow] to reduce model run time
A: feflow@...
Data: Mercoledì 13 maggio 2009, 12:42


Hello everyone...

I am doing groundwater flow and contaminant transport modeling for saturated
region with transient conditions. I am doing it for 1.0xE4 years. while doing
that i am facing two problems

1.Head values at some of the observation wells are oscillating 10-15 metres

2.Time step is not going beyond 200 days so it is taking so much time for
running. I am using automatic predictor corrector method.

i would like you all to give your suggestions so that i can resolve thee
problems.

Thanks.

Regards,
Manish Chopra

Hi Pete,

Thank you for your answer. Actually I should have done a mistake and
some confusion.

You are absolutely right. A seepage boundary condition is constrained
and the constrains work as I want. Initially I assigned an atmospheric
pressure (constrained) along the angled hole. Using the automatic tool
for the definition of a seepage boundary, I basically assigned a total
head equal to the elevation of each node of the hole. But the hole is
angled, then I automatically assigned a different total head (equal to
the elevation of each single node) along the angled hole. This
situation was making me crazy because I was obtaining nonsense
results. Then I realized that I had to use a constant head value along
the drainage hole (the highest elevation of the hole) and it made more
sense at the end.

Giovanni


On Mon, May 11, 2009 at 8:54 PM, Pete Sinton <psinton@...> wrote:
> Hi Giovanni,
>
> I think FEFLOW 5.3 shuts off discrete features in the UZ, but you should
> check with WASY about later versions.
>
> It should work if you constrain the discharge node to stop any outflow
> if the head at the node is lower than the elevation of the exit point of
> the borehole. I think a head-constrained cauchy node should work.
>
>
> *Pete Sinton*
>
> www.aquageo.us
>
>
>
> Giovanni Firmani wrote:
>>
>>
>> Dear all,
>>
>> I am dealing with a 2D transient and unsaturated model for
>> depressurization purposes. The client asked me to evaluate the effect
>> of horizontal drainage holes that I simulated as a seepage boundary.
>> In the same time I have been asked to do the same thing with inclined
>> ((below the horizontal line) drainage holes. I was wondering if in
>> this case the seepage boundary condition can be applied or not.
>> According to me, such holes should work as the horizontal ones as long
>> as the elevation of the water table is above the elevation of the
>> highest point of the hole, but when the hole becomes partially
>> unsaturated water can come out from the hole because the gradient is
>> not great enough. Using the seepage boundary condition then,
>> overestimates the volume coming out from the model.
>>
>> I was thinking to simulate it as an high conductive feature using the
>> "discrete element feature" tool, simulatin this condition as a very
>> permeable fault. Can the discrete element feature be used in an
>> unsaturated model ? As my holes progress with time can I generate a
>> power function for the property of a discrete element like a fault?
>>
>> thank you
>> Giovanni

Hi Marielena Lucen.....
 
Sorry for replying so late. I am having some case studies which i have done
using FEFLOW. If you are still in need of those, let me know. i will send those
to you.
 
Regards,
Manish Chopra 



--- On Thu, 19/2/09, marielenalucen <malenalucen@...> wrote:


From: marielenalucen <malenalucen@...>
Subject: [feflow] applications of feflow
To: feflow@...
Date: Thursday, 19 February, 2009, 8:13 AM

hi everybody

i desperate need a tutorial or some applications or examples using
feflow, please if some have a file in pdf or word about this please
send it to malenalucen@ gmail.com

Thank you

Marielena Lucen
Hydraulic Engineer
Peru

Hello everyone...

I am doing groundwater flow and contaminant transport modeling for saturated
region with transient conditions. I am doing it for 1.0xE4 years. while doing
that i am facing two problems

1.Head values at some of the observation wells are oscillating 10-15 metres

2.Time step is not going beyond 200 days so it is taking so much time for
running. I am using automatic predictor corrector method.

i would like you all to give your suggestions so that i can resolve thee
problems.

Thanks.

Regards,

Manish Chopra

Hi Giovanni,

I think FEFLOW 5.3 shuts off discrete features in the UZ, but you should
check with WASY about later versions.

It should work if you constrain the discharge node to stop any outflow
if the head at the node is lower than the elevation of the exit point of
the borehole. I think a head-constrained cauchy node should work.


*Pete Sinton*

www.aquageo.us



Giovanni Firmani wrote:
>
>
> Dear all,
>
> I am dealing with a 2D transient and unsaturated model for
> depressurization purposes. The client asked me to evaluate the effect
> of horizontal drainage holes that I simulated as a seepage boundary.
> In the same time I have been asked to do the same thing with inclined
> ((below the horizontal line) drainage holes. I was wondering if in
> this case the seepage boundary condition can be applied or not.
> According to me, such holes should work as the horizontal ones as long
> as the elevation of the water table is above the elevation of the
> highest point of the hole, but when the hole becomes partially
> unsaturated water can come out from the hole because the gradient is
> not great enough. Using the seepage boundary condition then,
> overestimates the volume coming out from the model.
>
> I was thinking to simulate it as an high conductive feature using the
> "discrete element feature" tool, simulatin this condition as a very
> permeable fault. Can the discrete element feature be used in an
> unsaturated model ? As my holes progress with time can I generate a
> power function for the property of a discrete element like a fault?
>
> thank you
> Giovanni

Dear all,

I am dealing with a 2D transient and unsaturated model for
depressurization purposes. The client asked me to evaluate the effect
of horizontal drainage holes that I simulated as a seepage boundary.
In the same time I have been asked to do the same thing with inclined
((below the horizontal line) drainage holes. I was wondering if in
this case the seepage boundary condition can be applied or not.
According to me, such holes should work as the horizontal ones as long
as the elevation of the water table is above the elevation of the
highest point of the hole, but when the hole becomes partially
unsaturated water can come out from the hole because the gradient is
not great enough. Using the seepage boundary condition then,
overestimates the volume coming out from the model.

I was thinking to simulate it as an high conductive feature using the
"discrete element feature" tool, simulatin this condition as a very
permeable fault. Can the discrete element feature be used in an
unsaturated model ? As my holes progress with time can I generate a
power function for the property of a discrete element like a fault?

thank you
Giovanni

Dear Colleagues

A PhD student who is looking into geothermal possibilities at a location and who
has collected a lot of data has contacted us.

He needs to analyse the data with a groundwater modelling package called FEFLOW.
However, this is too expensive for him to buy based on his likely useage.

Could you suggest a means whereby he could undertake his analysis without
purchase of a licence as after the analysis it appears unlikely he will require
it for much ongoing work.

Many Thanks, All advice appreciated

Dr John C Bullas MIHT FGS
Southamton
UK

Hi Mr. Giovanni

My model is saturated transient flow and contaminant transport with one river
with transfer boundary conditions. Others boundary conditions are constant only.
Most of the observation points are far away from the river.


-- In feflow@..., Giovanni Firmani <g.firmani@...> wrote:
>
> it is hard to understand if it is problem or not. Can you provide more
> details of your model? transient or steady? and in the first case are the
> BCs transient ? Saturated or unsaturated model? are you using the re-wetting
> capabilities (sometimes it could give some oscillations problems).
>
> Oscillations can also depend on other stresses of the model. maybe your
> observation point is close to a river that was defined with transient
> conditions... there are several reasons for oscillations. Try to be more
> specific.
>
> gio
>
>
> On Thu, Apr 23, 2009 at 3:15 PM, manish_cjonty2006 <
> manish_cjonty2006@...> wrote:
>
> > Hi
> >
> > I am facing a problem in feflow. It is when i am running my problem, the
> > graph of head values at various observation points is showing too many
> > oscillations in head values. Is anything wrong with that or it is just ok?
>

Hi Manish,

Oscillations are common especially in complex models; whether they are
important depends on the whether the oscillations decrease to values
small enough to be of no concern and also if the mass balance of the
model is acceptable (eg small compared to total inflows and outflows).

*Pete*
www.aquageo.us



manish_cjonty2006 wrote:
>
>
> Hi
>
> I am facing a problem in feflow. It is when i am running my problem,
> the graph of head values at various observation points is showing too
> many oscillations in head values. Is anything wrong with that or it is
> just ok?