Hi Dear Members

   I have some querries regarding the Visual modflow simulation. i found this
group and i hope that i will get some guidance in this regard.

   1.I am doing work in an alluvial plain and developing a three layered model of
the unconfined aquifer system of the area. I am bit confused in assigning the
boundary conditions for the canal that whether it should be assigned a stream
boundary or a recharge boundary and moreover it would be assigned on the top
layer or in the other lower layers as well.

   2.If there are streams in the area but those are having a very little flow
whether those should be assigned as the stream boundaries or left opened.

   I will be really thankful.

   Regards

Philip,

If you want to know how to use the program the user guide is very
good, if you want to know something more about the finite difference
method there should be a pdf file attached with the program package
that describes the theory. By the way you can find more about the
engine MODFLOW at the following webpage:

http://water.usgs.gov/nrp/gwsoftware/modflow2000/modflow2000.html

Ciao
Gio


2007/5/3, elizabeth Philip <philip_kochumol@...>:
> Hi, I am just starting  an introductory course in ground water modelling and
will be using VISUAL-MODFLOW. Would you please suggest me of books/notes that I
should refer as a starter.
>
> Thanks
> K. Philip

Hi, I am just starting  an introductory course in ground water modelling and
will be using VISUAL-MODFLOW. Would you please suggest me of books/notes that I
should refer as a starter.

Thanks
K. Philip

Hi members, I am working with Modflow since a couple of months and am
actually using PMWin. Now i am working on this 3D-model which has 20
stressperiods (each 1/2 day) with 12 timesteps each, i.e. 1h length.
Modflow runs up to timestep 8 in stress period 19 and then stops with
the following erro message:
An I/O error was detected (system call=lseek, errno=19, unit=50)
error occurs at _ubudsv_
called from _wel5bd_
called from _MAIN_

If i use only 11 timesteps, the program runs through and the more
timesteps i add the earlier it stops.

I hope someone of you might be able to help me with this.

Thanks in advance.

Maria

Dear Members,

   i am doing research on ground water optimization for coastal region. i need to
optimize pumping rate, etc..,. so i want any GW optimization program with source
code to learn and understand. Please share your ideas and help me in this
regard. if you have any query do mail me.

   With Regards
   Lenin
   Reserach Scholar
   Anna University
   Chennai

just go to the input section that you want to export, then file/export.
It'll walk you through

Best regards,
Arne Springorum


From: visual-modflow@...
[mailto:visual-modflow@...] On Behalf Of syed hashmath
Sent: Saturday, March 10, 2007 11:37 PM
To: gwmodel@yahoogroups.com
Cc: visual-modflow@...
Subject: [visual-modflow] Exporting in VMOD

Hi all,

Is there any option of exporting top, bottom, K, S, Rch etc in VMOD. I wish
to export them in ascii (x,y,z) or in grid format.

Regards,
Hash

Hi all,

   Is there any option of exporting top, bottom, K, S, Rch etc in VMOD.  I wish
to export them in ascii (x,y,z) or in grid format.

   Regards,
   Hash

Hello,

first I have to say, that this group ist very usefull! Thanks!

Here my question:
I have problems with convergence by running the modell. Sometimes you
can see in the residualgraph (running modus) a up and down in a very
regular way. This leads to "no convergence", if the maximun of
iteration ist reached.
Do you have any idea, whats wrong with the model, if doing in this way
by running the model?

Thanks for helping!

I am in Delhi, and would like to know, the vendors from whom the
vmodflow software can be purchased on limited tender basis, for a Govt
organisation. Can anyone pass me on this software by Email or by CD if
it is possible?

Dear András,

again, thank you for your kind offer.
I have sent you the VMOD project, but in the process of zipping the
file I needed to remove some of the overlay maps...One of which was
corrupted. This has in fact fixed the problem!

Feel free to have a look at the project anyway if your interested. I
promise you that the real-life scenarion is 10 times more complicated
than the model already is!

I cannot thank you enough for your offer in the first place, I was
going crazy and a strangers willingness to help someone 18000km away
made me feel alot better. Thank you.

Sincerely
Sean

--

Sean Berry
MSc Student
University of Auckland

Dear Sean,

If you zip your project files and send them over to me, I will try to reproduce
your problem (you may want to send a copy to my private account as well:
jakaband@...) . What version are you currently working with?

Best Regards,
András

Jakab és Társai Kft.
Ipar u. 17.
H-5100 Jászberény, Hungary
Tel./FAX: +36 (57) 502-640
Tel.: +36 (57) 502-641; +36 (30) 935-9966
E-mail: ajakab@...
www.jaketa.hu

Akciós ajánlatunk: www.jaketa.hu/Software/arlistak_akc.html

   ----- Original Message -----
   From: Sean Joseph Berry
   To: visual-modflow@...
   Sent: Tuesday, January 30, 2007 7:00 AM
   Subject: [visual-modflow] 3D Explorer


   The program runs fine but I get "Project files are not accessible or
   corrupted" when I try to open 3D explorer. Project file is on the hard
   drive, and 3D explorer works fine with other projects.
   WHI are somewhat reluctant to help at the moment, so any advice greatly
   recieved!

   Sean Berry
   MSc Student
   University of Auckland

The program runs fine but I get "Project files are not accessible or
corrupted" when I try to open 3D explorer. Project file is on the hard
drive, and 3D explorer works fine with other projects.
WHI are somewhat reluctant to help at the moment, so any advice greatly
recieved!

Sean Berry
MSc Student
University of Auckland

It can be simulated by injecting the know amount (inflow) by installing
injection wells (+ve flow).

*************************************************
Dr Vijay Kumar
Scientist 'E1'
National Institute of Hydrology
Roorkee 247 667 (Uttaranchal) India
Ph +91 1332 272905 to 909 Ext. 265
Mob: 9897083507
Email: vijay@...
Alt. email: vk_nih@...
*************************************************

   ----- Original Message -----
   From: gio2anne
   To: visual-modflow@...
   Sent: Wednesday, January 24, 2007 4:06 PM
   Subject: [visual-modflow] boundary condition


   Dear visual-modflow-group,

   I've problems with the left boundary condition of my model. I know the
   amount of groundwater (its just an estimation), which is the inflow in
   the aquifer (Layer 2, confined) from outsite in the modelgrid. It is a
   Neumann-Boundary Condition. In other words: instead of "no flow", i
   know the (in-) flow!
   But i don't know how to deal it. Wich function or boundary condition
   can i use to define this inflow? I don't want to use a head-depended BC.

   Thank you for helping me!

   Yours faithfully,
   gio

The specified flow (inflow) boundary condition may be simulated using injection
wells at the boundary.

Hope this helps.

Regards,
András Jakab

Jakab és Társai Kft.
Ipar u. 17.
H-5100 Jászberény, Hungary
Tel./FAX: +36 (57) 502-640
Tel.: +36 (57) 502-641; +36 (30) 935-9966
E-mail: ajakab@...
www.jaketa.hu

Akciós ajánlatunk: www.jaketa.hu/Software/arlistak_akc.html
   ----- Original Message -----
   From: gio2anne
   To: visual-modflow@...
   Sent: Wednesday, January 24, 2007 11:36 AM
   Subject: [visual-modflow] boundary condition


   Dear visual-modflow-group,

   I've problems with the left boundary condition of my model. I know the
   amount of groundwater (its just an estimation), which is the inflow in
   the aquifer (Layer 2, confined) from outsite in the modelgrid. It is a
   Neumann-Boundary Condition. In other words: instead of "no flow", i
   know the (in-) flow!
   But i don't know how to deal it. Wich function or boundary condition
   can i use to define this inflow? I don't want to use a head-depended BC.

   Thank you for helping me!

   Yours faithfully,
   gio

Dear visual-modflow-group,

I've problems with the left boundary condition of my model. I know the
amount of groundwater (its just an estimation), which is the inflow in
the aquifer (Layer 2, confined) from outsite in the modelgrid. It is a
Neumann-Boundary Condition. In other words: instead of "no flow", i
know the (in-) flow!
But i don't know how to deal it. Wich function or boundary condition
can i use to define this inflow? I don't want to use a head-depended BC.

Thank you for helping me!

Yours faithfully,
gio

Have you made a rough water budget for the area?
You have to check that the water that run through (according to average
transmissivity and gradient) is equal to the recharge.

Elisabet Hammarlund
Geo & Miljö

Direkt +46 (0)40 10 54 33
Mobil +46 (0)706 35 62 33

Ramböll Sverige AB
Isbergs gata 3
211 19 Malmö
www.ramboll.se
__________________________________________________

Frĺn: visual-modflow@... [mailto:visual-modflow@...]
För Sean Joseph Berry
Skickat: den 22 januari 2007 22:02
Till: visual-modflow@...
Ämne: Re: [visual-modflow]

The model area is approximately 5km N-S, 6km E-W. On the southern
border of the model the area discharges along 4.8km of coastline. The
lowest of the three layers is sedimentary flysch sequence, with
overlying lava flows (containing the aquifers). In places there are
overlying tuff deposits. Even with a week of calibration, some
observation wells are still 20m too high.
Three landfills (relatively small) are located along the coatline where
the groundwater discharges. All together there are 9 zones of
conductivity: Scoria, tuff, Sedimentary flysch, Landfill, 5 difference
lava flows.
The grid is 166*166.
At the present state, with any additional change to conductivity
values, I get "Abnormal termination: Floating Point Overflow".

Happy to provide more clarrification if needed.

Sean Berry
MSc Student
University of Auckland

The model area is approximately 5km N-S, 6km E-W. On the southern
border of the model the area discharges along 4.8km of coastline. The
lowest of the three layers is sedimentary flysch sequence, with
overlying lava flows (containing the aquifers). In places there are
overlying tuff deposits. Even with a week of calibration, some
observation wells are still 20m too high.
Three landfills (relatively small) are located along the coatline where
the groundwater discharges. All together there are 9 zones of
conductivity: Scoria, tuff, Sedimentary flysch, Landfill, 5 difference
lava flows.
The grid is 166*166.
At the present state, with any additional change to conductivity
values, I get "Abnormal termination: Floating Point Overflow".

Happy to provide more clarrification if needed.

--

Sean Berry
MSc Student
University of Auckland

-----------------------------------------------------------------------
This mail sent through University of Auckland http://www.auckland.ac.nz

Dear Sean

Can you expalin your problem in a bit detail?

Yash
Soil Scientist
International Rice Research Institute-India


----- Original Message ----
From: Sean Joseph Berry <s.berry@...>
To: visual-modflow@...
Sent: Monday, January 22, 2007 11:42:41 AM
Subject: [visual-modflow]

Am I suppose to email my forum postings to here?

If so...
I have a 3 layer model, which calibrate past 20m (Mean Residual).
When I change parameters past the current point, I get the "Abnormal
termination: Floating Point Overflow" message.
What does this mean?

--

Sean Berry
MSc Student
University of Auckland

Am I suppose to email my forum postings to here?

If so...
I have a 3 layer model, which calibrate past 20m (Mean Residual).
When I change parameters past the current point, I get the "Abnormal
termination: Floating Point Overflow" message.
What does this mean?

--

Sean Berry
MSc Student
University of Auckland

-----------------------------------------------------------------------
This mail sent through University of Auckland http://www.auckland.ac.nz

Dear Redha,

   I m completely agree with Yash Sir.

   We do 2D areal simulation modeling when we do not have the adequate data
(T,S,head etc) of some layers under consideration. As in 2D areal simulations,
effects of partial penetration of pumping is usually ignored (well is considered
to be fully penetrating the aquifer) because the effects of partial pumping are
limited to a radius equal to 1.5 (KX/KY)1/2 times the saturated thickness of the
aquifer.
   2D modeling is perfectly valid under data scarced condition. No doubt about
that.

   With Best Regards
   Vivek Gupta
   Mtech (Water Resources)
   IIT Kharagpur



Yashpal Saharawat <yash_saharawat@...> wrote:
   Dear Redha

You can do pumping test under in 2D modelling in axis-symmetrical mode when you
really do not know much about aquifer parameters and hydraulic gradient and
specially in confined aquifer (as Vivek's case) it can be useful. I appreciate
yours suggestions.

thanks with regards

Yashpal Singh Saharawat (Ph.D. DAAD)
Scientist
International Rice Research Institute-India office
1st Floor NASC Complex DPS Marg Pusa
New Delhi-110012 India
+ 91 11 25843802/25842802 (O)
+ 91 9311007818 (M)




----- Original Message ----
From: "rbeddek@..." <rbeddek@...>
To: visual-modflow@...
Sent: Wednesday, November 1, 2006 3:55:43 AM
Subject: Re: [visual-modflow] Pumping Well Schedule...

Dear Vivek,

I would like this opportunity to put this forward to anyone in the group:
How valid is simulating pumping in a 2D groundwater model ?, as a 2D set
up will miss the radial dimension which is proper to a pumping bore set
up.

I 'll appreciate your thoughts on that.

Cheers,
Redha


Please find embeded answers
>
>
> ----- Original Message ----
> From: vivek gupta <jazzvivek_2002@...>
> To: visual-modflow@...
> Sent: Sunday, October 29, 2006 9:43:35 AM
> Subject: Re: [visual-modflow] Pumping Well Schedule...
>
> Dear Yash..
>
>   Thank you for ur intelligent reply. Sir, some more things i wanted to
> ask u, As i m a beginner in Modeling, so i m seeking some more help frm
> u...
>
>   1)  Does MODFLOW account for the pumping hrs or it only accounts for the
> pumping days, because of the fact that pumping schedule in MODFLOW
> should be throughout the stress period.
>
> For your test you will be taking only one unit it may be days or hours
> whichever suits to your problem. But for one cycle of analysis it will be
> a single unit.
>
>   2)  I want to calibrate the model for 2 years transient period, I have
> weekly groundwater data, can u suggest me how should i divide this 2 yrs
> in to stress period and time steps for getting good results.
>
> You can take stress period in hours/days and give it as a zero value for
> one stress period. Actually the unit will depend on your objective what
> you want to get.
>
>   3)  Actually Sir I m doing 2D modeling, and i have the case of a
> confined aquifer, i.e. top layer confined, confined aquifer and again
> layer. and i want to model the saturated thickness as my model layer,
> but the problem is that a river which i have to use as a Cauchy boundary
> condition, is partially penetrating upto only upper confined layer (
> river bed elevation is above the saturate thickness of aquifer), so how
> can i use this river as a cauchy boundary without (perhaps)any hydraulic
> connection between them.
>
> If you have confined layer then river or anything outside is not going to
> matter and to have effect of river it should be unconfined and you can
> take total amount of water in yours layer as fixed i.e. if water coming
> from river by seepage it goes out from the other side of layer by
> gradient.
> .
>
>   4) The properties( T & S) and the boundary conditions that i will be
> assigning, will that be only for the saturated thickness(model layer) or
> i have to assign those for the top layer too.
>
> If you have confined layer then then need not to assign for upper layers.
> but its betetr to assign as while writing paper you will need these
>
>   Thanks again for ur fast response, I m again lookin forward for ur fast
> reply, it will help me assist in my project.
>
>   With Best Regards
>   Vivek Gupta
>
>
> Yashpal Saharawat <yash_saharawat@...> wrote:
>   Dear Vivek
>
> You can give pumping rate as 0 pumping rate during the non-pumping period
> and you should use actual well screen thickness.
>
> cheers...
> yash
>
>
> ----- Original Message ----
> From: vivek gupta <jazzvivek_2002@...>
> To: visual-modflow@...
> Sent: Friday, October 27, 2006 11:39:46 AM
> Subject: [visual-modflow] Pumping Well Schedule...
>
> Hi all...
>
> I m doing 2D transient GW modeling using Visual MODFLOW. I m facing some
> problem while entering pumping schedule. The problem is that MODFLOW
> allows a continuous pumping schedule, but in my study area pumping is
> intermittent, like in rainy season 15 days in  a month will be used for
> pumping, rest 15 days sustain with rain, i explain my prob with an
> example..( I have the case of constant pumping rate in one particular well
> site)
>
> suppose i have following pumping schedule for one of the well...
> jan- daily, 10h , -16 lps
> feb- daily, 10h, -16 lps
> mar- daily, 10h , -16 lps
> apr- daily, 10h, -16 lps
> may, daily, 10h , -16 lps
> june, 15 days, 6h, -16 lps
> july, 10 days, 6h, -16 lps
> AUG,  daily, 6 h, -16 lps
> .
> . and so on.
>
> Now while entering in MODFLOW i can't take account of those 15 days of
> june and july in which no pumping had been done, because MODFLOW allows
> continuous pumping schedule and the pumping schedule has to be through-out
> the full transient period, thats y i could'nt follow the continous pumping
> schedule too.
>
> so the only way out is...suppose if i have 2 yrs transient stress period
> with a constant pumping rate, the pumping schedule will be..
> start day    stop day       pumping rate(LPS)
> o             720              -16
>
> I want to check my above mentioned conclusion..suggestions are heartly
> welcomed.
>
> ALSO another question is that in 2D modeling shud the pumping wells'
> screen thickness be entered with full saturated thickness or shud i use
> the actual well screen thickness if i have the data of screen locations.
>
> With best Regards
> Vivek Gupta
> IIT kharagpur

Dear Redha

You can do pumping test under in 2D modelling in axis-symmetrical mode when you
really do not know much about aquifer parameters and hydraulic gradient and
specially in confined aquifer (as Vivek's case) it can be useful. I appreciate
yours suggestions.

thanks with regards

Yashpal Singh Saharawat (Ph.D. DAAD)
Scientist
International Rice Research Institute-India office
1st Floor NASC Complex DPS Marg Pusa
New Delhi-110012 India
+ 91 11 25843802/25842802 (O)
+ 91 9311007818 (M)




----- Original Message ----
From: "rbeddek@..." <rbeddek@...>
To: visual-modflow@...
Sent: Wednesday, November 1, 2006 3:55:43 AM
Subject: Re: [visual-modflow] Pumping Well Schedule...

Dear Vivek,

I would like this opportunity to put this forward to anyone in the group:
How valid is simulating pumping in a 2D groundwater model ?, as a 2D set
up will miss the radial dimension which is proper to a pumping bore set
up.

I 'll appreciate your thoughts on that.

Cheers,
Redha


Please find embeded answers
>
>
> ----- Original Message ----
> From: vivek gupta <jazzvivek_2002@...>
> To: visual-modflow@...
> Sent: Sunday, October 29, 2006 9:43:35 AM
> Subject: Re: [visual-modflow] Pumping Well Schedule...
>
> Dear Yash..
>
>   Thank you for ur intelligent reply. Sir, some more things i wanted to
> ask u, As i m a beginner in Modeling, so i m seeking some more help frm
> u...
>
>   1)  Does MODFLOW account for the pumping hrs or it only accounts for the
> pumping days, because of the fact that pumping schedule in MODFLOW
> should be throughout the stress period.
>
> For your test you will be taking only one unit it may be days or hours
> whichever suits to your problem. But for one cycle of analysis it will be
> a single unit.
>
>   2)  I want to calibrate the model for 2 years transient period, I have
> weekly groundwater data, can u suggest me how should i divide this 2 yrs
> in to stress period and time steps for getting good results.
>
> You can take stress period in hours/days and give it as a zero value for
> one stress period. Actually the unit will depend on your objective what
> you want to get.
>
>   3)  Actually Sir I m doing 2D modeling, and i have the case of a
> confined aquifer, i.e. top layer confined, confined aquifer and again
> layer. and i want to model the saturated thickness as my model layer,
> but the problem is that a river which i have to use as a Cauchy boundary
> condition, is partially penetrating upto only upper confined layer (
> river bed elevation is above the saturate thickness of aquifer), so how
> can i use this river as a cauchy boundary without (perhaps)any hydraulic
> connection between them.
>
> If you have confined layer then river or anything outside is not going to
> matter and to have effect of river it should be unconfined and you can
> take total amount of water in yours layer as fixed i.e. if water coming
> from river by seepage it goes out from the other side of layer by
> gradient.
> .
>
>   4) The properties( T & S) and the boundary conditions that i will be
> assigning, will that be only for the saturated thickness(model layer) or
> i have to assign those for the top layer too.
>
> If you have confined layer then then need not to assign for upper layers.
> but its betetr to assign as while writing paper you will need these
>
>   Thanks again for ur fast response, I m again lookin forward for ur fast
> reply, it will help me assist in my project.
>
>   With Best Regards
>   Vivek Gupta
>
>
> Yashpal Saharawat <yash_saharawat@...> wrote:
>   Dear Vivek
>
> You can give pumping rate as 0 pumping rate during the non-pumping period
> and you should use actual well screen thickness.
>
> cheers...
> yash
>
>
> ----- Original Message ----
> From: vivek gupta <jazzvivek_2002@...>
> To: visual-modflow@...
> Sent: Friday, October 27, 2006 11:39:46 AM
> Subject: [visual-modflow] Pumping Well Schedule...
>
> Hi all...
>
> I m doing 2D transient GW modeling using Visual MODFLOW. I m facing some
> problem while entering pumping schedule. The problem is that MODFLOW
> allows a continuous pumping schedule, but in my study area pumping is
> intermittent, like in rainy season 15 days in  a month will be used for
> pumping, rest 15 days sustain with rain, i explain my prob with an
> example..( I have the case of constant pumping rate in one particular well
> site)
>
> suppose i have following pumping schedule for one of the well...
> jan- daily, 10h , -16 lps
> feb- daily, 10h, -16 lps
> mar- daily, 10h , -16 lps
> apr- daily, 10h, -16 lps
> may, daily, 10h , -16 lps
> june, 15 days, 6h, -16 lps
> july, 10 days, 6h, -16 lps
> AUG,  daily, 6 h, -16 lps
> .
> . and so on.
>
> Now while entering in MODFLOW i can't take account of those 15 days of
> june and july in which no pumping had been done, because MODFLOW allows
> continuous pumping schedule and the pumping schedule has to be through-out
> the full transient period, thats y i could'nt follow the continous pumping
> schedule too.
>
> so the only way out is...suppose if i have 2 yrs transient stress period
> with a constant pumping rate, the pumping schedule will be..
> start day    stop day       pumping rate(LPS)
> o             720              -16
>
> I want to check my above mentioned conclusion..suggestions are heartly
> welcomed.
>
> ALSO another question is that in 2D modeling shud the pumping wells'
> screen thickness be entered with full saturated thickness or shud i use
> the actual well screen thickness if i have the data of screen locations.
>
> With best Regards
> Vivek Gupta
> IIT kharagpur

Dear Vivek,

I would like this opportunity to put this forward to anyone in the group:
How valid is simulating pumping in a 2D groundwater model ?, as a 2D set
up will miss the radial dimension which is proper to a pumping bore set
up.

I 'll appreciate your thoughts on that.

Cheers,
Redha


  Please find embeded answers
>
>
> ----- Original Message ----
> From: vivek gupta <jazzvivek_2002@...>
> To: visual-modflow@...
> Sent: Sunday, October 29, 2006 9:43:35 AM
> Subject: Re: [visual-modflow] Pumping Well Schedule...
>
> Dear Yash..
>
>   Thank you for ur intelligent reply. Sir, some more things i wanted to
> ask u, As i m a beginner in Modeling, so i m seeking some more help frm
> u...
>
>   1)  Does MODFLOW account for the pumping hrs or it only accounts for the
> pumping days, because of the fact that pumping schedule in MODFLOW
> should be throughout the stress period.
>
> For your test you will be taking only one unit it may be days or hours
> whichever suits to your problem. But for one cycle of analysis it will be
> a single unit.
>
>   2)  I want to calibrate the model for 2 years transient period, I have
> weekly groundwater data, can u suggest me how should i divide this 2 yrs
> in to stress period and time steps for getting good results.
>
> You can take stress period in hours/days and give it as a zero value for
> one stress period. Actually the unit will depend on your objective what
> you want to get.
>
>   3)  Actually Sir I m doing 2D modeling, and i have the case of a
> confined aquifer, i.e. top layer confined, confined aquifer and again
> layer. and i want to model the saturated thickness as my model layer,
> but the problem is that a river which i have to use as a Cauchy boundary
> condition, is partially penetrating upto only upper confined layer (
> river bed elevation is above the saturate thickness of aquifer), so how
> can i use this river as a cauchy boundary without (perhaps)any hydraulic
> connection between them.
>
> If you have confined layer then river or anything outside is not going to
> matter and to have effect of river it should be unconfined and you can
> take total amount of water in yours layer as fixed i.e. if water coming
> from river by seepage it goes out from the other side of layer by
> gradient.
> .
>
>   4) The properties( T & S) and the boundary conditions that i will be
> assigning, will that be only for the saturated thickness(model layer) or
> i have to assign those for the top layer too.
>
> If you have confined layer then then need not to assign for upper layers.
> but its betetr to assign as while writing paper you will need these
>
>   Thanks again for ur fast response, I m again lookin forward for ur fast
> reply, it will help me assist in my project.
>
>   With Best Regards
>   Vivek Gupta
>
>
> Yashpal Saharawat <yash_saharawat@...> wrote:
>   Dear Vivek
>
> You can give pumping rate as 0 pumping rate during the non-pumping period
> and you should use actual well screen thickness.
>
> cheers...
> yash
>
>
> ----- Original Message ----
> From: vivek gupta <jazzvivek_2002@...>
> To: visual-modflow@...
> Sent: Friday, October 27, 2006 11:39:46 AM
> Subject: [visual-modflow] Pumping Well Schedule...
>
> Hi all...
>
> I m doing 2D transient GW modeling using Visual MODFLOW. I m facing some
> problem while entering pumping schedule. The problem is that MODFLOW
> allows a continuous pumping schedule, but in my study area pumping is
> intermittent, like in rainy season 15 days in  a month will be used for
> pumping, rest 15 days sustain with rain, i explain my prob with an
> example..( I have the case of constant pumping rate in one particular well
> site)
>
> suppose i have following pumping schedule for one of the well...
> jan- daily, 10h , -16 lps
> feb- daily, 10h, -16 lps
> mar- daily, 10h , -16 lps
> apr- daily, 10h, -16 lps
> may, daily, 10h , -16 lps
> june, 15 days, 6h, -16 lps
> july, 10 days, 6h, -16 lps
> AUG,  daily, 6 h, -16 lps
> .
> . and so on.
>
> Now while entering in MODFLOW i can't take account of those 15 days of
> june and july in which no pumping had been done, because MODFLOW allows
> continuous pumping schedule and the pumping schedule has to be through-out
> the full transient period, thats y i could'nt follow the continous pumping
> schedule too.
>
> so the only way out is...suppose if i have 2 yrs transient stress period
> with a constant pumping rate, the pumping schedule will be..
> start day    stop day       pumping rate(LPS)
> o             720              -16
>
> I want to check my above mentioned conclusion..suggestions are heartly
> welcomed.
>
> ALSO another question is that in 2D modeling shud the pumping wells'
> screen thickness be entered with full saturated thickness or shud i use
> the actual well screen thickness if i have the data of screen locations.
>
> With best Regards
> Vivek Gupta
> IIT kharagpur

Please find embeded answers


----- Original Message ----
From: vivek gupta <jazzvivek_2002@...>
To: visual-modflow@...
Sent: Sunday, October 29, 2006 9:43:35 AM
Subject: Re: [visual-modflow] Pumping Well Schedule...

Dear Yash..

   Thank you for ur intelligent reply. Sir, some more things i wanted to ask u,
As i m a beginner in Modeling, so i m seeking some more help frm u...

   1)  Does MODFLOW account for the pumping hrs or it only accounts for the
pumping days, because of the fact that pumping schedule in MODFLOW should be
throughout the stress period.

For your test you will be taking only one unit it may be days or hours whichever
suits to your problem. But for one cycle of analysis it will be a single unit.

   2)  I want to calibrate the model for 2 years transient period, I have weekly
groundwater data, can u suggest me how should i divide this 2 yrs in to stress
period and time steps for getting good results.

You can take stress period in hours/days and give it as a zero value for one
stress period. Actually the unit will depend on your objective what you want to
get.

   3)  Actually Sir I m doing 2D modeling, and i have the case of a confined
aquifer, i.e. top layer confined, confined aquifer and again layer. and i want
to model the saturated thickness as my model layer, but the problem is that a
river which i have to use as a Cauchy boundary condition, is partially
penetrating upto only upper confined layer ( river bed elevation is above the
saturate thickness of aquifer), so how can i use this river as a cauchy boundary
without (perhaps)any hydraulic connection between them.

If you have confined layer then river or anything outside is not going to matter
and to have effect of river it should be unconfined and you can take total
amount of water in yours layer as fixed i.e. if water coming from river by
seepage it goes out from the other side of layer by gradient.
.

   4) The properties( T & S) and the boundary conditions that i will be
assigning, will that be only for the saturated thickness(model layer) or i have
to assign those for the top layer too.

If you have confined layer then then need not to assign for upper layers. but
its betetr to assign as while writing paper you will need these

   Thanks again for ur fast response, I m again lookin forward for ur fast reply,
it will help me assist in my project.

   With Best Regards
   Vivek Gupta


Yashpal Saharawat <yash_saharawat@...> wrote:
   Dear Vivek

You can give pumping rate as 0 pumping rate during the non-pumping period and
you should use actual well screen thickness.

cheers...
yash


----- Original Message ----
From: vivek gupta <jazzvivek_2002@...>
To: visual-modflow@...
Sent: Friday, October 27, 2006 11:39:46 AM
Subject: [visual-modflow] Pumping Well Schedule...

Hi all...

I m doing 2D transient GW modeling using Visual MODFLOW. I m facing some problem
while entering pumping schedule. The problem is that MODFLOW allows a continuous
pumping schedule, but in my study area pumping is intermittent, like in rainy
season 15 days in  a month will be used for pumping, rest 15 days sustain with
rain, i explain my prob with an example..( I have the case of constant pumping
rate in one particular well site)

suppose i have following pumping schedule for one of the well...
jan- daily, 10h , -16 lps
feb- daily, 10h, -16 lps
mar- daily, 10h , -16 lps
apr- daily, 10h, -16 lps
may, daily, 10h , -16 lps
june, 15 days, 6h, -16 lps
july, 10 days, 6h, -16 lps
AUG,  daily, 6 h, -16 lps
.
. and so on.

Now while entering in MODFLOW i can't take account of those 15 days of june and
july in which no pumping had been done, because MODFLOW allows continuous
pumping schedule and the pumping schedule has to be through-out the full
transient period, thats y i could'nt follow the continous pumping schedule too.

so the only way out is...suppose if i have 2 yrs transient stress period with a
constant pumping rate, the pumping schedule will be..
start day    stop day       pumping rate(LPS)
o             720              -16

I want to check my above mentioned conclusion..suggestions are heartly 
welcomed.

ALSO another question is that in 2D modeling shud the pumping wells' screen
thickness be entered with full saturated thickness or shud i use the actual well
screen thickness if i have the data of screen locations.

With best Regards
Vivek Gupta
IIT kharagpur

Dear Yash..

   Thank you for ur intelligent reply. Sir, some more things i wanted to ask u,
As i m a beginner in Modeling, so i m seeking some more help frm u...

   1)  Does MODFLOW account for the pumping hrs or it only accounts for the
pumping days, because of the fact that pumping schedule in MODFLOW should be
throughout the stress period.

   2)  I want to calibrate the model for 2 years transient period, I have weekly
groundwater data, can u suggest me how should i divide this 2 yrs in to stress
period and time steps for getting good results.

   3)  Actually Sir I m doing 2D modeling, and i have the case of a confined
aquifer, i.e. top layer confined, confined aquifer and again layer. and i want
to model the saturated thickness as my model layer, but the problem is that a
river which i have to use as a Cauchy boundary condition, is partially
penetrating upto only upper confined layer ( river bed elevation is above the
saturate thickness of aquifer), so how can i use this river as a cauchy boundary
without (perhaps)any hydraulic connection between them.

   4) The properties( T & S) and the boundary conditions that i will be
assigning, will that be only for the saturated thickness(model layer) or i have
to assign those for the top layer too.

   Thanks again for ur fast response, I m again lookin forward for ur fast reply,
it will help me assist in my project.

   With Best Regards
   Vivek Gupta


Yashpal Saharawat <yash_saharawat@...> wrote:
   Dear Vivek

You can give pumping rate as 0 pumping rate during the non-pumping period and
you should use actual well screen thickness.

cheers...
yash


----- Original Message ----
From: vivek gupta <jazzvivek_2002@...>
To: visual-modflow@...
Sent: Friday, October 27, 2006 11:39:46 AM
Subject: [visual-modflow] Pumping Well Schedule...

Hi all...

I m doing 2D transient GW modeling using Visual MODFLOW. I m facing some problem
while entering pumping schedule. The problem is that MODFLOW allows a continuous
pumping schedule, but in my study area pumping is intermittent, like in rainy
season 15 days in  a month will be used for pumping, rest 15 days sustain with
rain, i explain my prob with an example..( I have the case of constant pumping
rate in one particular well site)

suppose i have following pumping schedule for one of the well...
jan- daily, 10h , -16 lps
feb- daily, 10h, -16 lps
mar- daily, 10h , -16 lps
apr- daily, 10h, -16 lps
may, daily, 10h , -16 lps
june, 15 days, 6h, -16 lps
july, 10 days, 6h, -16 lps
AUG,  daily, 6 h, -16 lps
.
. and so on.

Now while entering in MODFLOW i can't take account of those 15 days of june and
july in which no pumping had been done, because MODFLOW allows continuous
pumping schedule and the pumping schedule has to be through-out the full
transient period, thats y i could'nt follow the continous pumping schedule too.

so the only way out is...suppose if i have 2 yrs transient stress period with a
constant pumping rate, the pumping schedule will be..
start day    stop day       pumping rate(LPS)
o             720              -16

I want to check my above mentioned conclusion..suggestions are heartly 
welcomed.

ALSO another question is that in 2D modeling shud the pumping wells' screen
thickness be entered with full saturated thickness or shud i use the actual well
screen thickness if i have the data of screen locations.

With best Regards
Vivek Gupta
IIT kharagpur

Dear Vivek

You can give pumping rate as 0 pumping rate during the non-pumping period and
you should use actual well screen thickness.

cheers...
yash


----- Original Message ----
From: vivek gupta <jazzvivek_2002@...>
To: visual-modflow@...
Sent: Friday, October 27, 2006 11:39:46 AM
Subject: [visual-modflow] Pumping Well Schedule...

Hi all...

I m doing 2D transient GW modeling using Visual MODFLOW. I m facing some problem
while entering pumping schedule. The problem is that MODFLOW allows a continuous
pumping schedule, but in my study area pumping is intermittent, like in rainy
season 15 days in  a month will be used for pumping, rest 15 days sustain with
rain, i explain my prob with an example..( I have the case of constant pumping
rate in one particular well site)

suppose i have following pumping schedule for one of the well...
jan- daily, 10h , -16 lps
feb- daily, 10h, -16 lps
mar- daily, 10h , -16 lps
apr- daily, 10h, -16 lps
may, daily, 10h , -16 lps
june, 15 days, 6h, -16 lps
july, 10 days, 6h, -16 lps
AUG,  daily, 6 h, -16 lps
.
. and so on.

Now while entering in MODFLOW i can't take account of those 15 days of june and
july in which no pumping had been done, because MODFLOW allows continuous
pumping schedule and the pumping schedule has to be through-out the full
transient period, thats y i could'nt follow the continous pumping schedule too.

so the only way out is...suppose if i have 2 yrs transient stress period with a
constant pumping rate, the pumping schedule will be..
start day    stop day       pumping rate(LPS)
o             720              -16

I want to check my above mentioned conclusion..suggestions are heartly 
welcomed.

ALSO another question is that in 2D modeling shud the pumping wells' screen
thickness be entered with full saturated thickness or shud i use the actual well
screen thickness if i have the data of screen locations.

With best Regards
Vivek Gupta
IIT kharagpur

Hi all...

I m doing 2D transient GW modeling using Visual MODFLOW. I m facing some problem
while entering pumping schedule. The problem is that MODFLOW allows a continuous
pumping schedule, but in my study area pumping is intermittent, like in rainy
season 15 days in  a month will be used for pumping, rest 15 days sustain with
rain, i explain my prob with an example..( I have the case of constant pumping
rate in one particular well site)

suppose i have following pumping schedule for one of the well...
jan- daily, 10h , -16 lps
feb- daily, 10h, -16 lps
mar- daily, 10h , -16 lps
apr- daily, 10h, -16 lps
may, daily, 10h , -16 lps
june, 15 days, 6h, -16 lps
july, 10 days, 6h, -16 lps
AUG,  daily, 6 h, -16 lps
.
. and so on.

Now while entering in MODFLOW i can't take account of those 15 days of june and
july in which no pumping had been done, because MODFLOW allows continuous
pumping schedule and the pumping schedule has to be through-out the full
transient period, thats y i could'nt follow the continous pumping schedule too.

so the only way out is...suppose if i have 2 yrs transient stress period with a
constant pumping rate, the pumping schedule will be..
start day    stop day       pumping rate(LPS)
o             720              -16

I want to check my above mentioned conclusion..suggestions are heartly 
welcomed.

ALSO another question is that in 2D modeling shud the pumping wells' screen
thickness be entered with full saturated thickness or shud i use the actual well
screen thickness if i have the data of screen locations.

With best Regards
Vivek Gupta
IIT kharagpur

Kampala, Wednesday 11th October 2006  08:10pm

Dear Adrian,

I had a similar problem with 3D display once, my PC would not even show
anything. First try to run your computer and then Visual Modflow in SAFE
MODE.

If you get a display, then it is probably your PC display settings giving
you trouble and you might have to twick those. But ill try and look up your
problem and see what I can find.

Nice day

Kakimpa Bruce
Makerere University
Faculty of Technology
P.O. Box 4311 Kampala
Email: brucekakimpa@...
           bkakimpa@...

Adrian,

Try copying the file to a new directory and running again. Let me know if this
works.

Thanks.
Joseph


adrgal2002 wrote:
> Dear Members
>
> I would like to know if any of you can help me out.
>
> I run a simple simulation with MODFLOW without any inconvenient, but
> when I try to open the results in 3-D it does not work out, and the
> following message appears:
>
> "vmf3dv, Projects files are not accesible or corrupted" . I changed
> the name of the file several times, verify the inputs, etc, still
> doesn`t work. I will appreciate very much any suggestion
>
> Regards
>
> Adrian

Dear Members

I would like to know if any of you can help me out.

I run a simple simulation with MODFLOW without any inconvenient, but
when I try to open the results in 3-D it does not work out, and the
following message appears:

"vmf3dv, Projects files are not accesible or corrupted" . I changed
the name of the file several times, verify the inputs, etc, still
doesn`t work. I will appreciate very much any suggestion

Regards

Adrian

Hello Sir/Madam,

This is Vivek Gupta from IIT kharagpur. I m doing Mtech here in Water resources.
and i m doing my project titled " Two dimensional transient groundwater flow
modeling of a river island using Visual MODFLOW v. 4.0".
(basin wide modeling without consideration of transport)

Since i have started using MODFLOW, I m facing some problems which are more
fundamental based than operational one.(These problems might look to be very
ordinary for you experienced ppl, so i m looking forward to get my answers with
the help of ur great expertise in MODFLOW),My problems are as follows:

1) I have three model layers in my site, upper is confined layer, middle is
confined aquifer and the lower isone confined one, so its a case of a complete
confined aquifer. The layers' elevation are very much variable in this site,
especially the middle one. I want to ask as i m doing 2D modeling, whether i
should put layers' elevation of all layers (from the known well logs)in model as
it is, or shud i specify three fixed thicknesses to all layers. (in other words
shud i place all (60) pumping wells' layer information directly in assign
elevation option of MODFLOW or do i need to use specified thickness option
separately for all three layers)As i m doing 2D modeling, so i m confused abt
this third dimension, plz give me a clear picture to deal with this 3rd
dimension (z) for asignment of all the parameters.

2) My second problem is somewhat similar to the previous one, we  have managed
to get 8 pumping well tests, and by using Aquifer Test software, i have got T
and S. I want to ask whether shud i asign this T and S to the second layer or do
i need to assign(copy) these parameters two all the existing layers (bcoz of 2D
nature.

3) This problem can only be solved by finding the results of my first question,i
have pumping wells which r having different screen thicknesses,keeping the fact
that i m doin 2D modeling, i want to know whether shud i keep the well screens
of all pumping wells equally penetrating full saturated thickness of the
confined aquifer  (2nd layer in the present case), or shud i assign as it is
according to the actual screen positions of all wells.

4)We r having data scarced condition, as we have only 3 years' gw level,
rainfall data(2004-06). I want to ask some time discretizing information that
can i use with these scarced data condition. Means wat kind of strees periods
assignments i can manage so as to get the best result of two dimensional
transient flow modeling

5)My study area is in Kathjodi river basin. its kind of a river island which is
completely surrounded by two rivers from east-west sides which joins at the
beginning and again at the outlet of the basin.I want to ask which boundary
conditions can i assign here. If i assign constant head boundary, shall the
river head remain constant through out the stress period? , knowing the fact
that river head varies seasonwise and also stresswise, is it good to use
constant boundary here in this basin. Or can i use head dependent flux boundary.
which one shud be the best for 2D modeling. is there any difference if i use
river package or GHB package for this basin.

6)Wat are the considerations for making 2D transient modeling different from 3D
flow modeling?

I want to thank u all for having great patience as the length of this question
paper has touched the limits perhaps. Kindly give ur kind answers to me. any
other suggestions except to these questions are heartly welcomed.

Thank u for giving ur precious time to me.

With Best Regards
Vivek Gupta
MTech(WRDM)
IIT KGP
INDIA
MO- 09733504396