springs like drain is better.

On 6/17/08, Jeane Santos <jepenoff@...> wrote:
> Hello.
>
> I'm working in a model to evaluate the impact of a mine in the water supply of
springs and rivers around the mine. My question is: what is better - put the
rivers and springs like river or like drains?
>
> Thanks
> Jeane

Hallo Jeane,

The drain boundary package in MODFLOW is designed to simulate the effects of
features e.g. agricultural drain, which remove water from thw aquifer at a rate
proportional to the difference between the head in the aquifer and the median
drain elevation (assuming the drain is partially full), so long as the head in
the aquifer is above that elevation, but which have no effect if the head of
the aquifer falls below the median of drain elevation.

So if hydraulic head (either water table or piezometric head) in aquifer beneath
the mine is below the head of river/spring (surface water level elevation) then
flow from the aquifer to the river/spring will show as ZERO. So I think in
this case, taking river/spring as "DRAIN boundary" is not appropriate.

Your objective is " to evaluate the impact of a mine in the water supply of the
rivers & springs around the mine"..so u have to account for the amount of flow
in stream/spring around the mine and to simulate the interaction
between stream/spring & groundwater in the aquifer beneath the mine ...for
which I think "STREAM boundary" will be appropriate for your objective. After
running the model u can get inflow/outflow to/from the model from "MASS BALANCE
REPORT" from which u can justify the effect of mine on discharges of its
surrounding river/springs.

Thank u

S.HALDER

--- On Wed, 18/6/08, Jeane Santos <jepenoff@...> wrote:

From: Jeane Santos <jepenoff@...>
Subject: [visual-modflow] impact of a mine on springs
To: visual-modflow@...
Date: Wednesday, 18 June, 2008, 1:18 AM

Hello.

I'm working in a model to evaluate the impact of a mine in the water supply of
springs and rivers around the mine. My question is: what is better - put the
rivers and springs like river or like drains?

Thanks
Jeane

Maybe, it's a good start point.

http://www.swstechnology.com/training_course.php?ID=8



-----Messaggio originale-----
Da: visual-modflow@...
[mailto:visual-modflow@...]Per conto di Srilert Chotpantarat
Inviato: venerdì 20 giugno 2008 5.46
A: visual-modflow@...
Cc: Lertc
Oggetto: [visual-modflow] Modeling for mining industry

Dear all,

I am just new member. Now, I am doing research about mining that plan to use
visual modflow to simulate in my study site. Could anyone ever train in
"modeling for mining industry" or any training that related to using visual
modflow for mining site?

please suggest me .

Looking forward to hearing from you.

Best regards,

Srilert
Environmental management
Thailand

Dear all,
 
I am just new member. Now, I am doing research about mining that plan to use
visual modflow to simulate in my study site. Could anyone ever train in
"modeling for mining industry" or any training that related to using visual
modflow for mining site?

please suggest me .
 
Looking forward to hearing from you.
 
Best regards,
 
Srilert
Environmental management
Thailand

Dear Shailendra,

if you want to use MODFLOW software to simulation groundwater flow or
contamination, u need the below parameters in the first step.

Parameter
Layer thickness
Kx,Ky
Kz
Dispersivity
Hor/long dispersivity
Ver/long dispersivity
Mol.diff.coeff
Bulk density
Kd
initial conc
Evapotranspiration
ss
sy
Eff.porosity
tot. porosity
recharge -normal
initial head
 


--- On Tue, 6/17/08, subrata halder <shalder_2007@...> wrote:

From: subrata halder <shalder_2007@...>
Subject: Re: [visual-modflow] how can i start MODFLOW
To: visual-modflow@...
Date: Tuesday, June 17, 2008, 6:50 PM

hello Shailendra,

MODFLOW is a widely used software for groundwater flow modeling purpose.

Required data for MODFLOW:

- base map of study area
- location of Hydrograph Stations(water level monitoring tube well) and its
filters' elevation(mamsl)
- water level data for last 5/10 years
- location of abstraction tube Wells and its its filters' elevation(mamsl) 
- daily discharge of tube wells
- rainfall data for last 5/10 yr
- Recharge(calculated ) data
-evapotranspiration data
-River stage data for last 5/10 years (If river boundary condition employed) &
river Cross   section
-Aquifer parameters (hydraulic conductivity, porosity(effective &
Total),specific storage(for confined aquifer), Specific yield (for unconfined
aquifer )
etc....

S.Halder

--- On Tue, 17/6/08, shailendra sonekar <shailendrasonekar@ yahoo.co. in> wrote:

From: shailendra sonekar <shailendrasonekar@ yahoo.co. in>
Subject: [visual-modflow] how can i start MODFLOW
To: visual-modflow@ yahoogroups. co.in
Date: Tuesday, 17 June, 2008, 11:27 AM

hello

i m fresher for using modflow. can anyone tell me how can i start in modflow.
what are the data requirements, what type of data is necessary for the modflow
and for what purpose we are using modflow.

shailendra sonekar

Hallo Jeane,

The drain boundary package in MODFLOW is designed to simulate the effects of
features e.g. agricultural drain, which remove water from thw aquifer at a rate
proportional to the difference between the head in the aquifer and the median
drain elevation (assuming the drain is partially full), so long as the head in
the aquifer is above that elevation, but which have no effect if the head of the
aquifer falls below the median of drain elevation.

So if hydraulic head (either water table or piezometric head) in aquifer beneath
the mine is below the head of river/spring (surface water level elevation) then
flow from the aquifer to the river/spring will show as ZERO. So I think in this
case, taking river/spring as "DRAIN boundary" is not appropriate.

Your objective is " to evaluate the impact of a mine in the water supply of the
rivers & springs around the mine"..so u have to account for the amount of flow
in stream/spring around the mine and to simulate the interaction
between stream/spring & groundwater in the aquifer beneath the mine ...for
which I think "STREAM boundary" will be appropriate for your objective. After
running the model u can get inflow/outflow to/from the model from "MASS BALANCE
REPORT" from which u can justify the effect of mine on discharges of its
surrounding river/springs.

Thank u
S.HALDER



--- On Wed, 18/6/08, Jeane Santos <jepenoff@...> wrote:

From: Jeane Santos <jepenoff@...>
Subject: [visual-modflow] impact of a mine on springs
To: visual-modflow@...
Date: Wednesday, 18 June, 2008, 1:18 AM

Hello.

I'm working in a model to evaluate the impact of a mine in the water supply of
springs and rivers around the mine. My question is: what is better - put the
rivers and springs like river or like drains?

Thanks
Jeane

Hello Jeane,

it depends on the size and flow of the springs and the connectivity with the
aquifer. The main difference between river and drain packages is that drains
always act discharging the aquifer, while river can also recharge it. The
drain cells become inactive (as a BC) if the aquifer water level goes down
below the drain elevation head. For river cells, the same situation causes
the reversion of the flow, from the aquifer to outside. The analysis of the
flow and water level variation in the springs can help you to make your
decision and to verify latter if the model is behaving as should.

Good luck!
Stela Cota


2008/6/17 Jeane Santos <jepenoff@...>:

>   Hello.
>
> I'm working in a model to evaluate the impact of a mine in the water supply
> of springs and rivers around the mine. My question is: what is better - put
> the rivers and springs like river or like drains?
>
> Thanks
> Jeane

Hello Sonekar,

Did you consider to take some course on Visual Modflow? Contact me on
advancedgwt@...
if you want.

Dragan


On Wed, Jun 18, 2008 at 6:53 AM, shailendra sonekar <
shailendrasonekar@...> wrote:

>   good morning
>
> first of all thanks for reply me,i m using modflow 4.0 version, its a demo
> version.
>
> --- On Tue, 17/6/08, reza saghravani
<rezasaghravani@...<rezasaghravani%40yahoo.com>>
> wrote:
>
> From: reza saghravani <rezasaghravani@...<rezasaghravani%40yahoo.com>
> >
> Subject: Re: [visual-modflow] how can i start MODFLOW
>
> To: visual-modflow@... <visual-modflow%40yahoogroups.co.in>
> Date: Tuesday, 17 June, 2008, 7:00 PM
>
> hi,
>
> what version of modflow do you have?
>
> Regards,
> Reza
>
> --- On Tue, 6/17/08, shailendra sonekar <shailendrasonekar@ yahoo.co. in>
> wrote:
> From: shailendra sonekar <shailendrasonekar@ yahoo.co. in>
> Subject: [visual-modflow] how can i start MODFLOW
> To: visual-modflow@ yahoogroups. co.in
> Date: Tuesday, June 17, 2008, 10:27 AM
>
> hello
>
> i m fresher for using modflow. can anyone tell me how can i start in
> modflow. what are the data requirements, what type of data is necessary for
> the modflow and for what purpose we are using modflow.
>
> shailendra sonekar

good morning

first of all thanks for reply me,i m using modflow 4.0 version, its a demo
version.


--- On Tue, 17/6/08, reza saghravani <rezasaghravani@...> wrote:

From: reza saghravani <rezasaghravani@...>
Subject: Re: [visual-modflow] how can i start MODFLOW
To: visual-modflow@...
Date: Tuesday, 17 June, 2008, 7:00 PM

hi,

what version of modflow do you have?

Regards,
Reza

--- On Tue, 6/17/08, shailendra sonekar <shailendrasonekar@ yahoo.co. in> wrote:
From: shailendra sonekar <shailendrasonekar@ yahoo.co. in>
Subject: [visual-modflow] how can i start MODFLOW
To: visual-modflow@ yahoogroups. co.in
Date: Tuesday, June 17, 2008, 10:27 AM

hello

i m fresher for using modflow. can anyone tell me how can i start in modflow.
what are the data requirements, what type of data is necessary for the modflow
and for what purpose we are using modflow.

shailendra sonekar

hello Shailendra,

MODFLOW is a widely used software for groundwater flow modeling purpose.

Required data for MODFLOW:

- base map of study area
- location of Hydrograph Stations(water level monitoring tube well) and its
filters' elevation(mamsl)
- water level data for last 5/10 years
- location of abstraction tube Wells and its its filters' elevation(mamsl) 
- daily discharge of tube wells
- rainfall data for last 5/10 yr
- Recharge(calculated) data
-evapotranspiration data
-River stage data for last 5/10 years (If river boundary condition employed) &
river Cross   section
-Aquifer parameters (hydraulic conductivity, porosity(effective &
Total),specific storage(for confined aquifer), Specific yield (for unconfined
aquifer )
etc....

S.Halder

--- On Tue, 17/6/08, shailendra sonekar <shailendrasonekar@...> wrote:

From: shailendra sonekar <shailendrasonekar@...>
Subject: [visual-modflow] how can i start MODFLOW
To: visual-modflow@...
Date: Tuesday, 17 June, 2008, 11:27 AM

hello

i m fresher for using modflow. can anyone tell me how can i start in modflow.
what are the data requirements, what type of data is necessary for the modflow
and for what purpose we are using modflow.

shailendra sonekar

Hello.

I'm working in a model to evaluate the impact of a mine in the water supply of
springs and rivers around the mine. My question is: what is better - put the
rivers and springs like river or like drains?

Thanks
Jeane

hi,

what version of modflow do you have?

Regards,
Reza


--- On Tue, 6/17/08, shailendra sonekar <shailendrasonekar@...> wrote:
From: shailendra sonekar <shailendrasonekar@...>
Subject: [visual-modflow] how can i start MODFLOW
To: visual-modflow@...
Date: Tuesday, June 17, 2008, 10:27 AM

hello

i m fresher for using modflow. can anyone tell me how can i start in modflow.
what are the data requirements, what type of data is necessary for the modflow
and for what purpose we are using modflow.

shailendra sonekar

hello

i m fresher for using modflow. can anyone tell me how can i start in modflow.
what are the data requirements, what type of data is necessary for the modflow
and for what purpose we are using modflow.

shailendra sonekar

Hello Albino,

I think it's a typical Modflow problem (FD method): a dry cell is going to be
dry for the whole simulation.
Try to enlarge your cell height and lenght where you applied the well, until he
doesn't get dry.

Good luck,

Daniele

P.S.: if you haven't recharge from the top of the cells, you can increase your
layer number: you are going to have a dry tin layer.


-----Messaggio originale-----
Da: visual-modflow@...
[mailto:visual-modflow@...]Per conto di john albino
Inviato: venerdì 13 giugno 2008 8.04
A: visual-modflow@...
Oggetto: [visual-modflow] Trouble in rewetting of cells

Hello,

I am using Visual Modflow (4.2) along with Seawat to model some
experiements conducted on saltwater intrusion.

In the model scheduled pumping is carried out for a short period of
time(in midway of the total time).
When analysing the output, the dry cells created by the pumping remain
as such for the rest of the time.

This happens even with the rewetting option being enabled in the flow
options.

Please suggest a possible remedy for this problem.

Thanks,

Albino

Hello,

I am using Visual Modflow (4.2) along with Seawat to model some
experiements conducted on saltwater intrusion.

In the model scheduled pumping is carried out for a short period of
time(in midway of the total time).
When analysing the output, the dry cells created by the pumping remain
as such for the rest of the time.

This happens even with the rewetting option being enabled in the flow
options.

Please suggest a possible remedy for this problem.

Thanks,

Albino

If you implement option-2, you will have to be very careful in assigning
recharge.



Stela Cota <stelacota@...> wrote:
           I can think in two options, but you must check the impacts of each one
in
the results of your model:

1) Import the terrain topography (1st layer top) and 1st layer bottom
(elevations for both will be the same for the cells where the first layer do
not exist), applying a minimum thickness for the 1st layer. This can be a
good solution or not, depending on your boundary conditions and parameters.

2) Apply inactive cells in the first layer for the cells where sand is not
present. I have never tried this option so I am not able to give you
any clues about the effects of doing this.... only remember that imposing an
inactive cell is equivalent to apply no flow boundary.

Good luck,

Stela Cota
Nuclear Tecnology Development Center - CDTN/CNEN
Belo Horizonte - Brazil
+55-31-3069-4610

2008/5/21 Dieter Plass <plass@...>:

> Hello,
>
> I have built a 3-layered model: quaternary sands on top of siltstone on
> top of sandstone. Now there are areas where layer1 (sand) does not
> exist. I do not know how to remove layer 1 for single cells in Visual
> Modflow. Please advise.

Hi,

   You cannot remove some cells in MODFLOW. Layers will cover the whole model
area.
   What you can do is; assign the properties of layer above or layer below to the
cells of layer where sand doesnt exists.

   See the "airport tutorial excercise" of Visual MODFLOW, you will find the
answer to your question.

   Syed



Dieter Plass <plass@...> wrote:
           Hello,

I have built a 3-layered model: quaternary sands on top of siltstone on
top of sandstone. Now there are areas where layer1 (sand) does not
exist. I do not know how to remove layer 1 for single cells in Visual
Modflow. Please advise.

Thanks for your feedback.

I have looked into the manual again and it seems I have to apply a
minimum thickness as it says that in Modflow layers must be continuous.
So minimum thickness + copying the properties from the layer below seems
to be a good solution.

I have thought about inactive cells too but I could imagine I get in
trouble in case I want to use recharge in the model later.

Dieter Plass
HydroGeo
Nuernberg
Germany

I can think in two options, but you must check the impacts of each one in
the results of your model:

1) Import the terrain topography (1st layer top) and 1st layer bottom
(elevations for both will be the same for the cells where the first layer do
not exist), applying a minimum thickness for the 1st layer. This can be a
good solution or not, depending on your boundary conditions and parameters.

2) Apply inactive cells in the first layer for the cells where sand is not
present. I have never tried this option so I am not able to give you
any clues about the effects of doing this.... only remember that imposing an
inactive cell is equivalent to apply no flow boundary.

Good luck,

Stela Cota
Nuclear Tecnology Development Center - CDTN/CNEN
Belo Horizonte - Brazil
+55-31-3069-4610



2008/5/21 Dieter Plass <plass@...>:

>   Hello,
>
> I have built a 3-layered model: quaternary sands on top of siltstone on
> top of sandstone. Now there are areas where layer1 (sand) does not
> exist. I do not know how to remove layer 1 for single cells in Visual
> Modflow. Please advise.

This can be done by assigning properties to the particular cell (or number of
cells) in first layer (sands) as that of second layer (siltstone).

*************************************************
Dr Vijay Kumar
Scientist 'E1'
Water Resources System Division
National Institute of Hydrology
Roorkee - 247 667, India.
Ph:+91-1332-272906-265
Fax: +91-1332-272123
Alt. email: vk_nih@...
*************************************************


   ----- Original Message -----
   From: Dieter Plass
   To: visual-modflow@...
   Sent: Thursday, May 22, 2008 1:27 AM
   Subject: [visual-modflow] Eliminating layer for single cells

   Hello,

   I have built a 3-layered model: quaternary sands on top of siltstone on
   top of sandstone. Now there are areas where layer1 (sand) does not
   exist. I do not know how to remove layer 1 for single cells in Visual
   Modflow. Please advise.

Hello,

I have built a 3-layered model: quaternary sands on top of siltstone on
top of sandstone. Now there are areas where layer1 (sand) does not
exist. I do not know how to remove layer 1 for single cells in Visual
Modflow. Please advise.

Date: Mon, 19 May 2008 09:41:30 -0000
From: "daniele_baldi" <daniele.baldi@...>
To: visual-modflow-owner@...
Subject: Re: Trouble Running PEST


Hi, I've done a similar problem (hob file was not created)
  and It was
only a directory (software) problem. I mean, I moved all
  the files
from the directory (present on my server) to my computer,
  on the
desktop directory and it's been running well.

Good Luck,

Daniele


--- In visual-modflow@..., "reganw79" <reganw79@...>
wrote:
>
> Hello!  I am trying to calibrate my model with one set of well
> observations and every time I try to run PEST, it says that
the .hob
> file could not be opened.  It appears as though a .hob file is not
> created -- any suggestions?
>
> Thanks!
>

Good Day !!!

You are invited to join "Yahoo! Groups - archydro" (ArcGIS -
Geographical Information System). This group aims to provide a forum
for exchange of ideas and experiences regarding application of GIS in
Hydrology and Water Resources; and use of ArcGIS software (in
general) and Arc Hydro (in particular).

Geographical Information Systems (GIS) are used to display,
manipulate and analyse spatial (map) data. ArcGIS (produced by ESRI)
is an integrated collection of software products for building a
complete geographic information system (GIS). There are three ArcGIS
desktop applications - ArcCatalog, ArcMap, and ArcToolbox. ArcCatalog
is the application for managing your spatial data holdings, for
managing your database designs, and for recording and viewing
metadata. ArcMap is used for all mapping and editing tasks, as well
as for map-based analysis. ArcToolbox is used for data conversion and
geoprocessing. Using these three applications together, you can
perform any GIS task, simple to advanced, including mapping, data
management, geographic analysis, data editing, and geoprocessing.
There are also server-based ArcGIS products, as well as ArcGIS
products for PDAs. Extensions can be purchased separately to increase
the functionality of ArcGIS.

GIS is a powerful tool for developing solutions for water resources
such as assessing water quality and managing water resources on a
local or regional scale. Hydrologists use GIS technology to integrate
various data and applications into one, manageable system. ArcGIS
with Arc Hydro gives you the flexibility to combine watershed
datasets from one map source with stream and river networks. The
suite of tools contained in Arc Hydro facilitate the creation,
manipulation, and display of hydro features and objects within the
ArcGIS environment. Use ArcGIS Spatial Analyst for hydrologic
analysis such as calculating flow across an elevation surface, which
provides the basis for creating stream networks and watersheds;
calculating flow path length; and assigning stream orders.

To subscribe this group, please send a blank email to
archydro-subscribe@yahoogroups.com

Apologies for cross-postings.

Regards
Kumar

Hi: it sounds as if your MODFLOW model is not executing correctly. Check the
folder that you are running the model in for the presence of the .GLO and
.LST files, and check the contents of those files for possible error
messages suggesting that there was a problem with the MODFLOW execution.

Good luck - Matt


On 5/15/08, reganw79 <reganw79@...> wrote:
>
> Hello!  I am trying to calibrate my model with one set of well
> observations and every time I try to run PEST, it says that the .hob
> file could not be opened.  It appears as though a .hob file is not
> created -- any suggestions?
>
> Thanks!

Hello!  I am trying to calibrate my model with one set of well
observations and every time I try to run PEST, it says that the .hob
file could not be opened.  It appears as though a .hob file is not
created -- any suggestions?

Thanks!

Hello everyone.

   I need to modeling a electrokinetic process to removal heavy metals (Co and Cr
VI) in shallow aquifer. But I don't know how to do this with Visual Modflow. 
Can anyone help me with any information?

   Thank you very much.

   Jeane Penoff.

Dear Member,

Can you please refer me to any relevant literature (case
studies/papers/web resources) pertaining to unsaturated and saturated
groundwater flow modelling to study the impact of rainwater
harvesting structures and artificial recharge structures on
groundwater system.

My apologies for cross-postings.

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

Web Page : http://www.angelfire.com/nh/cpkumar/
================================================
Unfold the Goddess Within:
http://groups.yahoo.com/group/Shambhavi/
================================================

Steady state model in modflow 4 layers high K, 1 river discharging the main
system
Not been able to calibrate targets successfully.
The model sensitivity does not show any specific parameters sensitive.
Could that be due to a coarse discretization effect?

Thanks in advance

Head boundary conditions in Visual MODFLOW, provided that you are in layer view,
are assigned layer by layer. In the Input menu select the Boundaries menu, and
select either Constant Head or General Head. Go to the layer you whish to assign
the appropriate boundary conditions (either steady state or transient) and
select Assign (Single, Line, Polygon or Window). Draw the boundary (right click
when you finished digitizing the boundary) and a pop up window will show up
where you can define your transient boundary condition by chosing the desired
Start Time and Stop Time. You may define as many intervals as you whish within
your model time frame. If you would like to assign the boundary exactly to the
layer you selected, do not check the Assign to appropriate layer check box.

Please read the online help or get back to me if you have further questions.

Hope this helped.

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 1: ajakab@...
E-mail 2: jakaband@...
www.jaketa.hu


Akciós ajánlatunk: www.jaketa.hu/Software/arlistak_akc.html
Featured Products: www.jaketa.hu/Software/prlists_spec.html
   ----- Original Message -----
   From: rdhoagland
   To: visual-modflow@...
   Sent: Monday, February 11, 2008 10:33 PM
   Subject: [visual-modflow] Assigning different boundary heads to confined and
uncontined layers


   I need to assign differing transient head boundaries to a confined
   layer than the unconfined layer of my model. How can this be done?

I need to assign differing transient head boundaries to a confined
layer than the unconfined layer of my model. How can this be done?