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
Date: Thu, 28 Sep 2006 11:50:26 -0000
From: "almikebon3" <almikebon3@...>
To: "C. P. Kumar" <cpkumar@...>
Subject: Visual Modflow question
Hi,
I'm Oihane Astui. Now I'm working with Visual Modflow and I
has some questions that I hope you can answer me.
What does exactly the term "storage" refer in the Mass
Balance? Have you consider it as IN or OUT items?
For any clarifications I would be grateful.
Best regards,
Oihane Astui
Dear All.
Have you got any experience in modeling fractured media? I wold like to know how
is the best way to input/represent falts and fractures in the model.
I'm looking forward for answers and I will highly appreciate all all of yours
help...
Thank you.
Glaucia, Sao paulo, Brazil.
[Non-text portions of this message have been removed]
Hi, Marcio,
Thanks for answer.
The project with "inflow into the shaft" is over.
Writing my mail (many, many months ago) I did not know many details.
Finally I had to assume that... shaft is hermetic.
On the other hand I never used DAFLOW...
Regards,
Adam
Użytkownik arcds_dis napisał:
> Hi Adam,
>
> This is one most of the problems that we have when using Modflow.
>
> Why din't you try to use DAFLOW that simulates interactin between
> subsurface and surface waters, mainly in open channels?
>
> Greetings,
>
> Marcio
> Brazil
>
> --- In visual-modflow@..., "adam_mendakiewicz"
> <adam_mendakiewicz@y...> wrote:
>
>>Dear All,
>>Have you got any experience in modellig of water inflow in mine
>
> shaft ?
>
>>The problem is how to model the shaft?
>>
>>The shaft is 400m deep, its perimeter is 4m. There are 3 vertical
>>dewatering boreholes located around. The value of total inflow into
>>the shaft is known, the inflow comes from several aquifers.
>>A vertical barrier of impervious material is planned arround the
>
> shaft
>
>>(from ground surface level to a depth of 70m) and the dewatering
>>borholes closed. The goal of the model is to find what will happen
>>with the water table and how much the inflow may decrease.
>>
>>What should be the best aproach in modelling the shaft?
>>
>>Adam
Dear Mr. Gupta,
THe problem can be handled in following manner:
1) For getting real world coordinate in desired projection from Lat/Long bound
you can take help of image processing facility available at RRSSC-Kharagpur,
mostly UTM co-ordinatees area desired.
2) Orianting grid is matter of ease of work, however if you are inputing as
DXF or any GIS layer they are north oriented. Grid can be oriented after
inputing the layer, but to best my knowledge you to feed your inputs again if
you do not find vid media.
Reply if it helps
Suparn
vivek gupta <jazzvivek_2002@...> wrote:
Hello Sir/Madam,
I m using Visual Modflow v.4.0 for Groundwater flow Modeling.As i m
a new user i m experiencing very elementry problems:-
1) In georeferencing a graphic file,it requires X AND Y world co-
ordinates, i want to know whether i have to enter Lat-Long directly
for X and Y World coordinate or is there some other transformation i
have to use.In manual i saw that coordinates are in five digit
figures so i want to ask something abt real world coordinates for
how to get them for particular grid location.
2) My study area is oriented in south eastward direction, firstly do
i need to orient Grid,secondly i want to know whether i have to
orient my Grid before georeferencing or after, thirdly on what basis
i shud orient my grid, i mean what r the things that r to be taken
care while orienting our model domain.
I m really looking forward for getting my answers as soon as
possibles, i will highly appreciate all of u for helping me...
Thank you.
Vivek Gupta , Mtech( water resources), IIT kharagpur, India
Hello Sir/Madam,
I m using Visual Modflow v.4.0 for Groundwater flow Modeling.As i m
a new user i m experiencing very elementry problems:-
1) In georeferencing a graphic file,it requires X AND Y world co-
ordinates, i want to know whether i have to enter Lat-Long directly
for X and Y World coordinate or is there some other transformation i
have to use.In manual i saw that coordinates are in five digit
figures so i want to ask something abt real world coordinates for
how to get them for particular grid location.
2) My study area is oriented in south eastward direction, firstly do
i need to orient Grid,secondly i want to know whether i have to
orient my Grid before georeferencing or after, thirdly on what basis
i shud orient my grid, i mean what r the things that r to be taken
care while orienting our model domain.
I m really looking forward for getting my answers as soon as
possibles, i will highly appreciate all of u for helping me...
Thank you.
Vivek Gupta , Mtech( water resources), IIT kharagpur, India
Hi Adam,
This is one most of the problems that we have when using Modflow.
Why din't you try to use DAFLOW that simulates interactin between
subsurface and surface waters, mainly in open channels?
Greetings,
Marcio
Brazil
--- In visual-modflow@..., "adam_mendakiewicz"
<adam_mendakiewicz@y...> wrote:
>
> Dear All,
> Have you got any experience in modellig of water inflow in mine
shaft ?
> The problem is how to model the shaft?
>
> The shaft is 400m deep, its perimeter is 4m. There are 3 vertical
> dewatering boreholes located around. The value of total inflow into
> the shaft is known, the inflow comes from several aquifers.
> A vertical barrier of impervious material is planned arround the
shaft
> (from ground surface level to a depth of 70m) and the dewatering
> borholes closed. The goal of the model is to find what will happen
> with the water table and how much the inflow may decrease.
>
> What should be the best aproach in modelling the shaft?
>
> Adam
>
Kampala, 10th July 2006 19:35HRS (EAT)
Hello Francesca,
The file which holds the grid information is "projectname.vmf" and grid
discretisation information is in "projectname.vmg". But if I understand your
problem, then this wont really help you. Those files only contain grid
information and in Visual ModFlow, grids are in row and column format, where
columns always run from top to bottom and rows run across the screen. In my
view it seems that you probably have an overlay map/image but do not like
the way it is oriented over the grid.
At this stage, if you re-orient the map over the grid to suit your
preference, then the underlying grid data for any cell (elevations,
properties, etc) won't correspond to the same geographic location that the
map shows and so the whole model won't really make sense. (E.g: wells won't
move with the overlay, cell elevations will not alter accordingly, etc)
Ideally, to do what you want to do, you would have to start from scratch and
redo the model with a re-oriented map. Then also re-orient the grid cell
properties data to ensure that each cell's properties are assigned to the
same spot as before.Be carefull as you add the cell data because it has to
be in effect reoriented as well. Then, your whole model will be reoriented.
(To avoid this, I usually choose my overlay map/image orientation before I
begin creating the model.)
Another option is that if you are only after the aesthetic benefit of
reorientation, you could use 3D exlporer, remove the grid display and rotate
the entire model. Then you could capture that image with any desired outputs
and add the grid to the captured image externally. But essentially, you wont
have reoriented the model, only the model display image.
The actual truth is in as far as I know, you probably have to redo the model
with a priorly reoriented map to get exactly what you want. Exporting,
reorienting and then importing the cell data may create more critical errors
that you may not be see until after allot of time and effort has been put
in. So if you really have to re-orient, for excellence or any other reason,
then the safest way is to redo the model from scratch, which will be easier
though since yo're familiar with the data now
Hope that was helpfull. Someone from the group was a great help to me when I
was starting, so I like to return the favour.
Wish you all the best. Id love to have a look at your finding in the end, if
you dont mind.
God bless and hope you succeed,
Kakimpa Bruce
Bsc. Civil Engineering
Makerere University
Kampala, Uganda
[Non-text portions of this message have been removed]
Francesca, if you think about rotating your model you might have to first
export all your inputs based on model coordinates (instead of world
coordinates). Then you can recreate the model relatively easy. I don't think
you can rotate the model domain without starting from scratch. But importing
would make things go much faster.
a
-----Original Message-----
From: visual-modflow@...
[mailto:visual-modflow@...]On Behalf Of Francesca
Sent: Thursday, July 06, 2006 6:23 AM
To: visual-modflow@...
Subject: [visual-modflow] VModflow 3.1 grid exportation
Hello everybody, I'm new in the group and I've used Visual Modflow 3.1
just for one model. I'm now at a good point, good model, good
calibration... but I think it would improve changing the grid
orientation. Does everybody know how can I do in an already existing
model without doing it anew? Which are the files in which grid
information are stored?
Thanks everybody! Fra
I'm experiencing a problem while trying to run a model. I choose Run
-> Run -> Translate & Run. It translates but doesn't start the numeric
engine.
Has anyone ever experienced something like that???
I think it may be a error added to the vmf file due to previous
erroneous run of the model which resulted in abnormal termination.
Then I thought in deleting the 'track' of this error left in vmf file,
like 'reseting' the run part in the vmf file. Does anyone know how do
I do that???
Thanks in advance, and sorry for the quite certain mistakes in my
concepts about this issue.
Samuel
go to Grid>Edit Grid here you can add, remove, refine or course etc. the grid.
shimul
Room No 92, Pleinlaan 2
1050 Brussels
Belgium
Phone: +3226295592
Mobile: +32484928897
Francesca <fralotti@...> wrote: Hello everybody, I'm new in the group and
I've used Visual Modflow 3.1
just for one model. I'm now at a good point, good model, good
calibration... but I think it would improve changing the grid
orientation. Does everybody know how can I do in an already existing
model without doing it anew? Which are the files in which grid
information are stored?
Thanks everybody!
Fra
Hello everybody, I'm new in the group and I've used Visual Modflow 3.1
just for one model. I'm now at a good point, good model, good
calibration... but I think it would improve changing the grid
orientation. Does everybody know how can I do in an already existing
model without doing it anew? Which are the files in which grid
information are stored?
Thanks everybody! Fra
===========================================================
Please note deadline for applications is June 7th 2006.
Terms of reference may be found in the following documents:
Strategic Study of Groundwater Resources in Prey Veng and Svay Rieng
Phase 2
http://www.seila.gov.kh/english/consult_en.asp?
language=en&pgid=30&title=Consultant
A Senior Hydrogeologist is required (57 person-days)
The Senior Hydrogeologist will be a senior international expert in
the development and application of groundwater models for water-
resources applications. The Senior Hydrogeologist will have overall
responsibility for model development and will oversee the work of
the Intermediate Hydrogeologist. It is envisaged that the Senior
Hydrogeologist will be based overseas and will conduct the majority
of his/her work at home base, communicating with the team in
Cambodia by e-mail. Provision will be made for the Senior
Hydrogeologist to make two visits to Cambodia of 2-3 weeks each.
Model development will be based on the data collected during the
already completed Phase 1 study.
http://203.223.42.59:8080/downloads/SSGWRPVSR_STFS-FinalReport_05-12-
23.pdf
STRATEGIC STUDY OF GROUNDWATER RESOURCES IN PREY VENG AND SVAY RIENG
(PHASE 1) With funding from IFAD-RPRP project, STFS contracted IDE
to carry out the first phase of a strategic study of groundwater
resources in Prey Veng and Svay Rieng provinces. The objective of
the study is to assess the potential for sustainable development of
groundwater irrigation in Prey Veng and Svay Rieng provinces,
considering the availability of groundwater resources and other
environmental constraints. The first phase comprised collection and
interpretation of existing data on groundwater availability and
groundwater use, and recommendations for subsequent phases of the
study.
Other members of the four person team have already been selected.
GEB Development, a respected national consulting and construction
company with strong links to the Cambodian Ministry of Rural
Development, will prepare the bid. GEB Corp may also be contacted
directly at:
GEB Development Corporation
Chhum Bok Village
Kompong Speu, Cambodia
Email1: Landmine_Mapper@...
Email2: geb@...
Hi guys
I've just joined in this group to get some help.
I've two pumping test data for two different layers pupmped at the
same place in different time.
for that two test i'm getting completely opposite conductivity for
each layer!!! and not able to yield designed water while pumping in
the top layer.
can anyone tell me how to increase the yield. for ur information i've
limitation on conductivity and already tried with rewetting and
relaxation parameter:(
thank u.
Madflow:(
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