Hi All

I have been following the chain of eMails regarding GW hydrology education
for hydrologists who are not familiar with GW hydrology. I belong to this
category and a rather semi-practicing surface water hydrologist at that. I
commend the initiative of Dr Krishnaiah and other learned GW gurus.

I am still unclear as to how this course is going to be presented. Is it
going to be a short duration (?) course or is it going to be on-line
tutotial? Is the course going to be formatted so as to cater for various
levels of practitioners - ie beginners (myself included), practitioners
with sound fundamental GW hydrology knowledge, practitioners with good
working knowledge of  techniques and currently available computational
tools, etc.

I apologise if I am on a totally different wave length and have not
understood the cyber-space discussions.

Kes Kesari
$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$
Senior Water Resource Analyst
Department of Sustainability & Environment
Level 1, 8 Nicholson Street
East Melbourne
Victoria 3002
Australia
Tel: +61 3 9637 9981
Fax: +61 3 9637 8999



mi2992@...
Sent by: gwmodel@yahoogroups.com
31/07/2006 07:29 PM
Please respond to
gwmodel@yahoogroups.com


To
gwmodel@yahoogroups.com
cc

Subject
[gwmodel] Re: Working Group for Groundwater Modelling Guidance

Dear members

I think the realization of some tutorials could be a good idea.
In particular, as Dr Rehab says, develop simplified conceptualization
for a problem, resolve it using an apropriate mathematical equation
and then develope a numerical model, could be a good approach.
In particular I think it could be a good approach for tutorial
written for students and beginners in general.

Now I'm working on a simple tutorial with regard to the flow towards
a trench realized in a phreatic aquifer and analized in a steady
state conditions.
I will inform you when the tutorial will be realized.
Best regards

Gabriele Bernagozzi

Dear All

Aquifer Vulnerability Mapping (with the help of DRASTIC or other criteria)
is more done for writing a Paper than  for putting to any practical use by a
concerned, responsible agency. Anyone knows about a successful case history
and is willing to share it with others?

On similar lines, I had enquired with this GW Model Group if anyone knows
about a
successful Ground Water MODEL which was actually put to field use for
sustainable aquifer management - And I got only one response! (from Prof.
Elango from India).

- Dr. Shrikant Limaye. Director, Ground Water Inst. &
Project Leader, UNESCO-IUGS-IGCP Project no.523 "GROWNET: Ground water
networking for best practices in ground water management in low-income
countries." Website: www.igcp-grownet.org


----- Original Message -----
From: "Jasminko Karanjac" <karanjac@...>
To: <gwmodel@yahoogroups.com>
Sent: Thursday, July 27, 2006 10:38 PM
Subject: Re: [gwmodel] Re: Vulnerability


> Dear Ali:
>
> The "vulnerability mapping" is a common activity of hydrogeologists these
> days. The criteria for mapping are well defined, and many countries have
> mapped their ground water systems according to "vulnerability" criteria.
>
> As an example, in a coastal environment, the vulnerability criteria could
be
> as follows:
>      - Seawater intrusion: closeness to the coast, intrusion already
> advanced, too much ground water development.
>      - Soil cover: thickness, permeability, filtration and sorption
> capacity.
>      - Land use: agriculture with fertilizers (nitrates, phosphates,
etc.).
>      - Depth to ground water.
>      - Ground water gradient, velocity of flow, residence time.
>      - Alluvial deposits near rivers, rivers recharging aquifers, local
> cones of depression created near rivers.
>      - Industrial developments, waste water ponds, industrial canals.
>
> For example, some authors, including myself, have created rating systems
for
> quantifying vulnerability.
> One of criteria could be "soil cover thickness":
>     - Zero cover thickness. Permeable materials (sand, gravel, and
> limestone) exposed at the surface.
>     - Clay, marl, mudstone, shale, and like, between 0 and 10 m thick,
> clean, impermeable; or more than 10 m thick but with sandy or loamy
content.
>      - Clay, marl, mudstone, shale, and like, more than 10 m thick; w/out
> sand, loam, or rock.
>
> Just by intuition, you would not expect much of a contaminant penetrating
> into ground water from the surface if there is a thick and impermeable
soil
> cover. Then again, if there is no contaminating industry you would not
> expect industrial pollutants entering ground water. Or nitrates and
> fertilizers from agricultural lands, etc.
>
> Most of discussion about "vulnerability" of aquifers is common sense and a
> lot of hydrogeological experience.
>
> Regards,
> ======================
> Dr. Jasminko Karanjac, Consultant Hydrogeologist & Professor (ret.)
> e-mail: karanjac@...
> tel. +381-11-2163983 +381-64-311-0304 (mobile)
> www.geocities.com/karanjac
>
> ----- Original Message -----
> From: "aprilwave2004" <yasudanaoki@...>
> To: <gwmodel@yahoogroups.com>
> Sent: Thursday, July 27, 2006 6:40 AM
> Subject: [gwmodel] Re: Vulnerability
>
>
> > Hi Ali,
> >
> > I think it eventually depends on how it is defined or how you define it.
> >
> > However in the engineering context it is often used in the following
> > expression.
> >
> > Hazard = risk x Vulnerability
> >
> > In this case the risk is a measure of probability of a negative event
> > happening.
> >
> > Vulnerability is a measure of how sensitive a given environment or an
> > entity is to external stress. It carries pretty much the same meaning
> > as the English word vulnerability.
> >
> > I suuggest you look for words "Risk", "Hazard" in engineering text
> > books for more detail.
> >
> > Naoki
> >
> >
> >
> >>   What's the meaning of vulnerability, such as vulnerabilty
> > mapping, ...etc. I need to know the meaning of vulnerability when
> > attached to other words of hydrogeology.
> >>
> >>   Thanks
> >>   Ali Taha
>
>
>
>
>
> =================================================

One has to look no farther than the City of Dayton, Ohio for a
vulnerability mapping success story.  Their program is one of the strongest
in the US.  They even have tax credits to get hazardous waste businesses
out of the wellfield vulnerability zone (2 year travel time).
Dave Russell


At 02:19 AM 8/2/2006  Wednesday, you wrote:
>Dear All
>
>Aquifer Vulnerability Mapping (with the help of DRASTIC or other criteria)
>is more done for writing a Paper than  for putting to any practical use by a
>concerned, responsible agency. Anyone knows about a successful case history
>and is willing to share it with others?
>
>On similar lines, I had enquired with this GW Model Group if anyone knows
>about a
>successful Ground Water MODEL which was actually put to field use for
>sustainable aquifer management - And I got only one response! (from Prof.
>Elango from India).
>
>- Dr. Shrikant Limaye. Director, Ground Water Inst. &
>Project Leader, UNESCO-IUGS-IGCP Project no.523 "GROWNET: Ground water
>networking for best practices in ground water management in low-income
>countries." Website: www.igcp-grownet.org
>
>
>----- Original Message -----
>From: "Jasminko Karanjac" <karanjac@...>
>To: <gwmodel@yahoogroups.com>
>Sent: Thursday, July 27, 2006 10:38 PM
>Subject: Re: [gwmodel] Re: Vulnerability
>
>
> > Dear Ali:
> >
> > The "vulnerability mapping" is a common activity of hydrogeologists these
> > days. The criteria for mapping are well defined, and many countries have
> > mapped their ground water systems according to "vulnerability" criteria.
> >
> > As an example, in a coastal environment, the vulnerability criteria could
>be
> > as follows:
> >      - Seawater intrusion: closeness to the coast, intrusion already
> > advanced, too much ground water development.
> >      - Soil cover: thickness, permeability, filtration and sorption
> > capacity.
> >      - Land use: agriculture with fertilizers (nitrates, phosphates,
>etc.).
> >      - Depth to ground water.
> >      - Ground water gradient, velocity of flow, residence time.
> >      - Alluvial deposits near rivers, rivers recharging aquifers, local
> > cones of depression created near rivers.
> >      - Industrial developments, waste water ponds, industrial canals.
> >
> > For example, some authors, including myself, have created rating systems
>for
> > quantifying vulnerability.
> > One of criteria could be "soil cover thickness":
> >     - Zero cover thickness. Permeable materials (sand, gravel, and
> > limestone) exposed at the surface.
> >     - Clay, marl, mudstone, shale, and like, between 0 and 10 m thick,
> > clean, impermeable; or more than 10 m thick but with sandy or loamy
>content.
> >      - Clay, marl, mudstone, shale, and like, more than 10 m thick; w/out
> > sand, loam, or rock.
> >
> > Just by intuition, you would not expect much of a contaminant penetrating
> > into ground water from the surface if there is a thick and impermeable
>soil
> > cover. Then again, if there is no contaminating industry you would not
> > expect industrial pollutants entering ground water. Or nitrates and
> > fertilizers from agricultural lands, etc.
> >
> > Most of discussion about "vulnerability" of aquifers is common sense and a
> > lot of hydrogeological experience.
> >
> > Regards,
> > ======================
> > Dr. Jasminko Karanjac, Consultant Hydrogeologist & Professor (ret.)
> > e-mail: karanjac@...
> > tel. +381-11-2163983 +381-64-311-0304 (mobile)
> > www.geocities.com/karanjac
> >
> > ----- Original Message -----
> > From: "aprilwave2004" <yasudanaoki@...>
> > To: <gwmodel@yahoogroups.com>
> > Sent: Thursday, July 27, 2006 6:40 AM
> > Subject: [gwmodel] Re: Vulnerability
> >
> >
> > > Hi Ali,
> > >
> > > I think it eventually depends on how it is defined or how you define it.
> > >
> > > However in the engineering context it is often used in the following
> > > expression.
> > >
> > > Hazard = risk x Vulnerability
> > >
> > > In this case the risk is a measure of probability of a negative event
> > > happening.
> > >
> > > Vulnerability is a measure of how sensitive a given environment or an
> > > entity is to external stress. It carries pretty much the same meaning
> > > as the English word vulnerability.
> > >
> > > I suuggest you look for words "Risk", "Hazard" in engineering text
> > > books for more detail.
> > >
> > > Naoki
> > >
> > >
> > >
> > >>   What's the meaning of vulnerability, such as vulnerabilty
> > > mapping, ...etc. I need to know the meaning of vulnerability when
> > > attached to other words of hydrogeology.
> > >>
> > >>   Thanks
> > >>   Ali Taha

Dear colleagues,

I am Nanang Fitriana. from Indonesia. I did my post graduation in
Water Resources Engineering and have nearly two years experience in
hydrological projects and studies.

I was mainly concentrated in research projects dealing with Design and
management of water resources.

I am looking forward for a suitable position, where I can improve my
professional skill and career.

Detailed curriculum vitae will be sent on request.

Advise/Suggestions from experts in this field are also requested.

Hoping to hear a favorable response.

Regards
Nanang Fitriana

Nanang Fitriana.
Hydrologist,
PT. Indra Karya (Persero) Consulting Engineering,
Jakarta

Ph:+6221-8192636,Mobile +6281324037732
eN_Fitriane@...

Hi,

Vulnerability is often carried out with DRASTIC and similar tools.
However, there is also work carried out looking at vulnerability in
reverse sense; Given that there is a well field, what are the areas
that recharge the well field, which activites occur there now and what
activities are acceptable based on soil, unsat zone, aquifer material etc.

I can think of a couple of successful groundwater models that have
been used for sustainable groundwater management, both from a quality
as well as quantity point of view. These models are from here in New
Zealand and Denmark. I believe the USGS has successful examples as well.

Thom
--- In gwmodel@yahoogroups.com, "Dr. S.D. Limaye" <limaye@...> wrote:
>
> Dear All
>
> Aquifer Vulnerability Mapping (with the help of DRASTIC or other
criteria)
> is more done for writing a Paper than  for putting to any practical
use by a
> concerned, responsible agency. Anyone knows about a successful case
history
> and is willing to share it with others?
>
> On similar lines, I had enquired with this GW Model Group if anyone
knows
> about a
> successful Ground Water MODEL which was actually put to field use for
> sustainable aquifer management - And I got only one response! (from
Prof.
> Elango from India).
>
> - Dr. Shrikant Limaye. Director, Ground Water Inst. &
> Project Leader, UNESCO-IUGS-IGCP Project no.523 "GROWNET: Ground water
> networking for best practices in ground water management in low-income
> countries." Website: www.igcp-grownet.org
>
>
> ----- Original Message -----
> From: "Jasminko Karanjac" <karanjac@...>
> To: <gwmodel@yahoogroups.com>
> Sent: Thursday, July 27, 2006 10:38 PM
> Subject: Re: [gwmodel] Re: Vulnerability
>
>
> > Dear Ali:
> >
> > The "vulnerability mapping" is a common activity of
hydrogeologists these
> > days. The criteria for mapping are well defined, and many
countries have
> > mapped their ground water systems according to "vulnerability"
criteria.
> >
> > As an example, in a coastal environment, the vulnerability
criteria could
> be
> > as follows:
> >      - Seawater intrusion: closeness to the coast, intrusion already
> > advanced, too much ground water development.
> >      - Soil cover: thickness, permeability, filtration and sorption
> > capacity.
> >      - Land use: agriculture with fertilizers (nitrates, phosphates,
> etc.).
> >      - Depth to ground water.
> >      - Ground water gradient, velocity of flow, residence time.
> >      - Alluvial deposits near rivers, rivers recharging aquifers,
local
> > cones of depression created near rivers.
> >      - Industrial developments, waste water ponds, industrial canals.
> >
> > For example, some authors, including myself, have created rating
systems
> for
> > quantifying vulnerability.
> > One of criteria could be "soil cover thickness":
> >     - Zero cover thickness. Permeable materials (sand, gravel, and
> > limestone) exposed at the surface.
> >     - Clay, marl, mudstone, shale, and like, between 0 and 10 m thick,
> > clean, impermeable; or more than 10 m thick but with sandy or loamy
> content.
> >      - Clay, marl, mudstone, shale, and like, more than 10 m
thick; w/out
> > sand, loam, or rock.
> >
> > Just by intuition, you would not expect much of a contaminant
penetrating
> > into ground water from the surface if there is a thick and impermeable
> soil
> > cover. Then again, if there is no contaminating industry you would not
> > expect industrial pollutants entering ground water. Or nitrates and
> > fertilizers from agricultural lands, etc.
> >
> > Most of discussion about "vulnerability" of aquifers is common
sense and a
> > lot of hydrogeological experience.
> >
> > Regards,
> > ======================
> > Dr. Jasminko Karanjac, Consultant Hydrogeologist & Professor (ret.)
> > e-mail: karanjac@...
> > tel. +381-11-2163983 +381-64-311-0304 (mobile)
> > www.geocities.com/karanjac
> >
> > ----- Original Message -----
> > From: "aprilwave2004" <yasudanaoki@...>
> > To: <gwmodel@yahoogroups.com>
> > Sent: Thursday, July 27, 2006 6:40 AM
> > Subject: [gwmodel] Re: Vulnerability
> >
> >
> > > Hi Ali,
> > >
> > > I think it eventually depends on how it is defined or how you
define it.
> > >
> > > However in the engineering context it is often used in the following
> > > expression.
> > >
> > > Hazard = risk x Vulnerability
> > >
> > > In this case the risk is a measure of probability of a negative
event
> > > happening.
> > >
> > > Vulnerability is a measure of how sensitive a given environment
or an
> > > entity is to external stress. It carries pretty much the same
meaning
> > > as the English word vulnerability.
> > >
> > > I suuggest you look for words "Risk", "Hazard" in engineering text
> > > books for more detail.
> > >
> > > Naoki
> > >
> > >
> > >
> > >>   What's the meaning of vulnerability, such as vulnerabilty
> > > mapping, ...etc. I need to know the meaning of vulnerability when
> > > attached to other words of hydrogeology.
> > >>
> > >>   Thanks
> > >>   Ali Taha

Dear Dr. Limaye,

I agree with your view points. But it will be
part of decision process in coming years.

I would like to add another case study of groundwater
model of Patna Urban area. The Govt. has strated
working on the implement the management options i.e.
optimization of pumping rate, new well field,
regulation to control the ground water abstraction
within the urban area.

with kind regards
ashok

Dr Ashok Kumar
Groundwater Modeller
44,Gulab Vihar Aptt.,
Plot No. 17, Sector -9, Rohini New Delhi- 85, India
Mo# +91-98181-74707
Landline # +91-11-26122339
http://www.geocities.com/ashok_bcst


--- "Dr. S.D. Limaye" <limaye@...> wrote:

> Dear All
>
> Aquifer Vulnerability Mapping (with the help of
> DRASTIC or other criteria)
> is more done for writing a Paper than  for putting
> to any practical use by a
> concerned, responsible agency. Anyone knows about a
> successful case history
> and is willing to share it with others?
>
> On similar lines, I had enquired with this GW Model
> Group if anyone knows
> about a
> successful Ground Water MODEL which was actually put
> to field use for
> sustainable aquifer management - And I got only one
> response! (from Prof.
> Elango from India).
>
> - Dr. Shrikant Limaye. Director, Ground Water Inst.
> &
> Project Leader, UNESCO-IUGS-IGCP Project no.523
> "GROWNET: Ground water
> networking for best practices in ground water
> management in low-income
> countries." Website: www.igcp-grownet.org
>
>
> ----- Original Message -----
> From: "Jasminko Karanjac" <karanjac@...>
> To: <gwmodel@yahoogroups.com>
> Sent: Thursday, July 27, 2006 10:38 PM
> Subject: Re: [gwmodel] Re: Vulnerability
>
>
> > Dear Ali:
> >
> > The "vulnerability mapping" is a common activity
> of hydrogeologists these
> > days. The criteria for mapping are well defined,
> and many countries have
> > mapped their ground water systems according to
> "vulnerability" criteria.
> >
> > As an example, in a coastal environment, the
> vulnerability criteria could
> be
> > as follows:
> >      - Seawater intrusion: closeness to the coast,
> intrusion already
> > advanced, too much ground water development.
> >      - Soil cover: thickness, permeability,
> filtration and sorption
> > capacity.
> >      - Land use: agriculture with fertilizers
> (nitrates, phosphates,
> etc.).
> >      - Depth to ground water.
> >      - Ground water gradient, velocity of flow,
> residence time.
> >      - Alluvial deposits near rivers, rivers
> recharging aquifers, local
> > cones of depression created near rivers.
> >      - Industrial developments, waste water ponds,
> industrial canals.
> >
> > For example, some authors, including myself, have
> created rating systems
> for
> > quantifying vulnerability.
> > One of criteria could be "soil cover thickness":
> >     - Zero cover thickness. Permeable materials
> (sand, gravel, and
> > limestone) exposed at the surface.
> >     - Clay, marl, mudstone, shale, and like,
> between 0 and 10 m thick,
> > clean, impermeable; or more than 10 m thick but
> with sandy or loamy
> content.
> >      - Clay, marl, mudstone, shale, and like, more
> than 10 m thick; w/out
> > sand, loam, or rock.
> >
> > Just by intuition, you would not expect much of a
> contaminant penetrating
> > into ground water from the surface if there is a
> thick and impermeable
> soil
> > cover. Then again, if there is no contaminating
> industry you would not
> > expect industrial pollutants entering ground
> water. Or nitrates and
> > fertilizers from agricultural lands, etc.
> >
> > Most of discussion about "vulnerability" of
> aquifers is common sense and a
> > lot of hydrogeological experience.
> >
> > Regards,
> > ======================
> > Dr. Jasminko Karanjac, Consultant Hydrogeologist &
> Professor (ret.)
> > e-mail: karanjac@...
> > tel. +381-11-2163983 +381-64-311-0304 (mobile)
> > www.geocities.com/karanjac
> >
> > ----- Original Message -----
> > From: "aprilwave2004"
> <yasudanaoki@...>
> > To: <gwmodel@yahoogroups.com>
> > Sent: Thursday, July 27, 2006 6:40 AM
> > Subject: [gwmodel] Re: Vulnerability
> >
> >
> > > Hi Ali,
> > >
> > > I think it eventually depends on how it is
> defined or how you define it.
> > >
> > > However in the engineering context it is often
> used in the following
> > > expression.
> > >
> > > Hazard = risk x Vulnerability
> > >
> > > In this case the risk is a measure of
> probability of a negative event
> > > happening.
> > >
> > > Vulnerability is a measure of how sensitive a
> given environment or an
> > > entity is to external stress. It carries pretty
> much the same meaning
> > > as the English word vulnerability.
> > >
> > > I suuggest you look for words "Risk", "Hazard"
> in engineering text
> > > books for more detail.
> > >
> > > Naoki
> > >
> > >
> > >
> > >>   What's the meaning of vulnerability, such as
> vulnerabilty
> > > mapping, ...etc. I need to know the meaning of
> vulnerability when
> > > attached to other words of hydrogeology.
> > >>
> > >>   Thanks
> > >>   Ali Taha

Dr. Kumar:

Thanks for inviting me to be on the committee. I am not sure if I can make such
a huge commitment. I can certainly contribute to reviewing some material. But I
cannot spend time on putting the material together. Having worked on groundwater
modeling for the last 15 years including the from days when we didn't have
interface to set up data for MODFLOW, I am scared to commit for such a huge
task. Also, with four graduate students and a fulltime job, I cannot just spare
time.

If it is no more than 2-3 hrs a week, I would be willing to offer myself on the
committee.

At this stage, I suggest the following.....

1. Prepare a list of participants interested in this modeling exercise.

2. Those who are interested in learning modeling paradigm may trace the
groundwater modeling case study of WOBURN case near Massachussetes.... based on
which movie "Civil Action" was made.

It is one of the thoroughly investigated study with reasonable complexities.

I don't have the links for those documents at present. But I am sure someone
could post it.

3. A publication on groundwater modeling by NH Rao and PBS Sarma (in Journal of
hydrology sometime late 80's or early 90's) is a good one.

4. USGS and EPA sites lots of groundwater modeling study reports.

5. One may seek the project report from some scientist in India who responded to
Dr.S.D.Limaye regarding the groundwater modeling in operation.

Until the modalities are finalised, the prospective candidates may work on the
above.

-boliset

Dear readers and Dr. Kes Kesari,

    Actually, it is not like a course. My intentions
are like series of lectures/tutorials starting from
basics to case studies. These may not be at regular
intervals. Because, the experts may not get time to do
so. Whoever want whatever information required for
them can avail from that material. 'gwmodel' consists
of wide spectrum of readers starting from beginners to
experts. So, these lectures are expected to solve the
purpose of almost all.

The efforts should be made to cater for various levels
of practitioners, beginners and practitioners with
sound fundamental GW hydrology knowledge,
practitioners with good working knowledge of
techniques and currently available computational
tools, etc. as mentioned by Kes Kesari.

      I appreciate Dr. C. P. kumar for recognizing the
importance of the problem and the efforts taken by him
in trying to formulate the group of experts.

     Some readers raised objections for the tutorials
saying that few readers without doing any homework
just keep asking questions like where can they get
literature on modeling or so. It cannot be denied that
such kind of questions should not be asked. But, that
cannot be avoided also. Few such kind of people may be
there.

      For the most of the readers even if modeling is
known theoretically, when it comes to construct a
deterministic math model, it requires lot of skill
which cannot be found in the text books. As for as
published literature is concerned, the methodology is
not explained sufficiently. That way USGS reports are
excellent. But those cannot be referred by all. If the
case studies are discussed reasonably in detail, that
will help practitioners as well as beginners.

      Actually, in countries like India, as it is
groundwater is misused and ill treated. If models are
constructed wrongly and implemented, the consequences
will be harmful. It takes lot of time to know the
consequences and it will be too late to rectify it.
Hence, before finalizing the model if it is discussed
openly among the learned people, the inherent or
overlooked flaws can be rectified. So, in right spirit
modelers should discuss the cases for betterment and
that will also help beginners in getting insights in
the modeling. I hope it is appreciated by group
members.

With regards
Krishnaiah

I am still unclear as to how this course is going to
be presented. Is it
going to be a short duration (?) course or is it going
to be on-line
tutotial?

--- Kes.Kesari@... wrote:

> Hi All
>
> I have been following the chain of eMails regarding
> GW hydrology education
> for hydrologists who are not familiar with GW
> hydrology. I belong to this
> category and a rather semi-practicing surface water
> hydrologist at that. I
> commend the initiative of Dr Krishnaiah and other
> learned GW gurus.
>
> I am still unclear as to how this course is going to
> be presented. Is it
> going to be a short duration (?) course or is it
> going to be on-line
> tutotial? Is the course going to be formatted so as
> to cater for various
> levels of practitioners - ie beginners (myself
> included), practitioners
> with sound fundamental GW hydrology knowledge,
> practitioners with good
> working knowledge of  techniques and currently
> available computational
> tools, etc.
>
> I apologise if I am on a totally different wave
> length and have not
> understood the cyber-space discussions.
>
> Kes Kesari
> $%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$%$
> Senior Water Resource Analyst
> Department of Sustainability & Environment
> Level 1, 8 Nicholson Street
> East Melbourne
> Victoria 3002
> Australia
> Tel: +61 3 9637 9981
> Fax: +61 3 9637 8999

I maintain a website with hydrogeology data related to the Woburn case:

http://frontpage.et.byu.edu/woburn/

Norm Jones

>-----Original Message-----
>From: gwmodel@yahoogroups.com [mailto:gwmodel@yahoogroups.com]
>On Behalf Of boliset@...
>Sent: Wednesday, August 02, 2006 6:29 PM
>To: gwmodel@yahoogroups.com
>Subject: RE: [gwmodel] Working Group for Groundwater Modelling Guidance
>
>Dr. Kumar:
>
>Thanks for inviting me to be on the committee. I am not sure
>if I can make such a huge commitment. I can certainly
>contribute to reviewing some material. But I cannot spend time
>on putting the material together. Having worked on groundwater
>modeling for the last 15 years including the from days when we
>didn't have interface to set up data for MODFLOW, I am scared
>to commit for such a huge task. Also, with four graduate
>students and a fulltime job, I cannot just spare time.
>
>If it is no more than 2-3 hrs a week, I would be willing to
>offer myself on the committee.
>
>At this stage, I suggest the following.....
>
>1. Prepare a list of participants interested in this modeling exercise.
>
>2. Those who are interested in learning modeling paradigm may
>trace the groundwater modeling case study of WOBURN case near
>Massachussetes.... based on which movie "Civil Action" was made.
>
>It is one of the thoroughly investigated study with reasonable
>complexities.
>
>I don't have the links for those documents at present. But I
>am sure someone could post it.
>
>3. A publication on groundwater modeling by NH Rao and PBS
>Sarma (in Journal of hydrology sometime late 80's or early
>90's) is a good one.
>
>4. USGS and EPA sites lots of groundwater modeling study reports.
>
>5. One may seek the project report from some scientist in
>India who responded to Dr.S.D.Limaye regarding the groundwater
>modeling in operation.
>
>Until the modalities are finalised, the prospective candidates
>may work on the above.
>
>-boliset

Dear members,

I am thankful to the following members who have agreed to contribute
as a member of Working Group for Groundwater Modelling Guidance.

1. Thom (tdkrom@...)
2. David M. Bean (dmbean@...)
3. Rehab O.Abdel Rahmam (alaarehab@...)
4. Dave Russell (dlr@...)
5. Boliset (boliset@...) - Only 2-3 hrs a week for reviewing
some material.

I have summarised various suggestions from members regarding
functions of the Working Group:

1(a). Selection and standardization of an existing freeware or very
inexpensive model for training,

1(b). Review and upgrading of the software manual, and most
importantly,

1(c). The writing of model guidance as a supplement to the existing
tutorial. When the model manual is published, it would be sold for a
nominal fee with the fees going to support the activities of this
group and compensate the authors for their time and trouble.

2. Migration towards a set of "classic" groundwater modeling problems
that every practicer should be aware of.

3. Look into what has been done by Dr. Paul van der Heidje and others
with regards to standard simulation tests for groundwater models.

4. Development of simple computer models. This include how to develop
simplified conceptualization for any problem, selection of the
appropriate mathematical equation, and then the use of numerical
scheme.

5(a). Classical, Typical and Specific case studies of Groundwater
modeling.

5(b). Conceptualization of problem with appropriately simplifying it,
selection of appropriate mathematical equations and then use of the
numerical scheme, model guidance in order to avoid misuse of model
and opening of discussions about the methodologies that have been
adopted in different research papers and case studies for the benefit
of beginners as well as practitioners. Inter-disciplinary approach in
finding parameters (Geometrical, Physical and Chemical) required as
inputs in the construction of the model as well as during
calibration, verification and post auditing.

6. Realization of some tutorials - develop simplified
conceptualization for a problem, resolve it using an apropriate
mathematical equation and then develope a numerical model - could be
a good approach for tutorial written for students and beginners in
general.

7(a). Prepare a list of participants interested in this modeling
exercise.

7(b). Those who are interested in learning modeling paradigm may
trace the groundwater modeling case study of WOBURN case near
Massachussetes.... based on which movie "Civil Action" was made. It
is one of the thoroughly investigated study with reasonable
complexities.

7(c). A publication on groundwater modeling by NH Rao and PBS Sarma
(in Journal of hydrology sometime late 80's or early 90's) is a good
one.

7(d). USGS and EPA sites lots of groundwater modeling study reports.

7(e). One may seek the project report from some scientist in India
who responded to Dr. S. D. Limaye regarding the groundwater modeling
in operation.

Until the modalities are finalised, the prospective candidates may
work on the above.

8(a). Series of lectures/tutorials starting from basics to case
studies. These may not be at regular intervals.

8(b). The efforts should be made to cater for various levels of
practitioners, beginners and practitioners with sound fundamental GW
hydrology knowledge, practitioners with good working knowledge of
techniques and currently available computational tools, etc.

8(c). For the most of the readers, even if modeling is known
theoretically, when it comes to construct a deterministic math model,
it requires lot of skill which cannot be found in the text books. As
for as published literature is concerned, the methodology is not
explained sufficiently. That way USGS reports are excellent. But
those cannot be referred by all. If the case studies are discussed
reasonably in detail, that will help practitioners as well as
beginners.

8(d). Before finalizing the model, if it is discussed openly among
the learned people, the inherent or overlooked flaws can be
rectified. So, in right spirit, modelers should discuss the cases for
betterment and that will also help beginners in getting insights in
the modeling.

8(e). It is to be decided how this course is going to be presented.
Is it going to be a short duration (?) course or is it going to be on-
line tutotial?

I request the above working group members to interact with each other
and formulate (in specific terms) about the scope and functioning of
the working group and other related modalities.

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

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

Kumar:

Thank you for the summary of suggestions for a Groundwater Modeling Guidance
document.  Many of the ideas can be addressed with only minor effort, other
may be long-term goals.

Perhaps the first thing we need to do is set up a web site that where we can
share ideas, drafts of documents, and sample problems. The working group
members would have read/write access, and everyone would have read access.

Microsoft Sharpoint can be used to develop this type of website. I will see
if I can arrange for this on my company server. Alternatively, if someone is
so inclined, a more "classic" HTML web site can be developed and hosted by
someone else.

Once we have a site developed, I think we can post available guidance
relatively quickly, and develop new guidance over time.  I would prefer to
keep things relatively informal, with flexible deadlines so this does not
become a burden to the working group.

Regards

David M. Bean

-----Original Message-----
From: gwmodel@yahoogroups.com [mailto:gwmodel@yahoogroups.com] On Behalf Of
C. P. Kumar
Sent: Saturday, August 05, 2006 11:19 PM
To: gwmodel@yahoogroups.com
Subject: [gwmodel] Working Group for Groundwater Modelling Guidance

Dear members,

I am thankful to the following members who have agreed to contribute
as a member of Working Group for Groundwater Modelling Guidance.

1. Thom (tdkrom@...)
2. David M. Bean (dmbean@...)
3. Rehab O.Abdel Rahmam (alaarehab@...)
4. Dave Russell (dlr@...)
5. Boliset (boliset@...) - Only 2-3 hrs a week for reviewing
some material.

I have summarised various suggestions from members regarding
functions of the Working Group:

1(a). Selection and standardization of an existing freeware or very
inexpensive model for training,

1(b). Review and upgrading of the software manual, and most
importantly,

1(c). The writing of model guidance as a supplement to the existing
tutorial. When the model manual is published, it would be sold for a
nominal fee with the fees going to support the activities of this
group and compensate the authors for their time and trouble.

2. Migration towards a set of "classic" groundwater modeling problems
that every practicer should be aware of.

3. Look into what has been done by Dr. Paul van der Heidje and others
with regards to standard simulation tests for groundwater models.

4. Development of simple computer models. This include how to develop
simplified conceptualization for any problem, selection of the
appropriate mathematical equation, and then the use of numerical
scheme.

5(a). Classical, Typical and Specific case studies of Groundwater
modeling.

5(b). Conceptualization of problem with appropriately simplifying it,
selection of appropriate mathematical equations and then use of the
numerical scheme, model guidance in order to avoid misuse of model
and opening of discussions about the methodologies that have been
adopted in different research papers and case studies for the benefit
of beginners as well as practitioners. Inter-disciplinary approach in
finding parameters (Geometrical, Physical and Chemical) required as
inputs in the construction of the model as well as during
calibration, verification and post auditing.

6. Realization of some tutorials - develop simplified
conceptualization for a problem, resolve it using an apropriate
mathematical equation and then develope a numerical model - could be
a good approach for tutorial written for students and beginners in
general.

7(a). Prepare a list of participants interested in this modeling
exercise.

7(b). Those who are interested in learning modeling paradigm may
trace the groundwater modeling case study of WOBURN case near
Massachussetes.... based on which movie "Civil Action" was made. It
is one of the thoroughly investigated study with reasonable
complexities.

7(c). A publication on groundwater modeling by NH Rao and PBS Sarma
(in Journal of hydrology sometime late 80's or early 90's) is a good
one.

7(d). USGS and EPA sites lots of groundwater modeling study reports.

7(e). One may seek the project report from some scientist in India
who responded to Dr. S. D. Limaye regarding the groundwater modeling
in operation.

Until the modalities are finalised, the prospective candidates may
work on the above.

8(a). Series of lectures/tutorials starting from basics to case
studies. These may not be at regular intervals.

8(b). The efforts should be made to cater for various levels of
practitioners, beginners and practitioners with sound fundamental GW
hydrology knowledge, practitioners with good working knowledge of
techniques and currently available computational tools, etc.

8(c). For the most of the readers, even if modeling is known
theoretically, when it comes to construct a deterministic math model,
it requires lot of skill which cannot be found in the text books. As
for as published literature is concerned, the methodology is not
explained sufficiently. That way USGS reports are excellent. But
those cannot be referred by all. If the case studies are discussed
reasonably in detail, that will help practitioners as well as
beginners.

8(d). Before finalizing the model, if it is discussed openly among
the learned people, the inherent or overlooked flaws can be
rectified. So, in right spirit, modelers should discuss the cases for
betterment and that will also help beginners in getting insights in
the modeling.

8(e). It is to be decided how this course is going to be presented.
Is it going to be a short duration (?) course or is it going to be on-
line tutotial?

I request the above working group members to interact with each other
and formulate (in specific terms) about the scope and functioning of
the working group and other related modalities.

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

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

I thought I would write to inform the folks interested in creating a
groundwater modeling tutorial that the EPA created such a document.
This is a manual of 20 problems of increasing difficulty. The
groundwater exercises are all written for MODFLOW and included
digital files for each of the problems. While this document was free
at one time, I doubt it is any longer. The problems can be
purchased, however, from Scientific Software for approximately $75
US.

The manual was written by Peter Anderson of Geotrans. The reference
is below:

U.S. EPA, 1993, A Manual of Instructional Problems for the U.S.G.S.
MODFLOW Model, EPA/600/R-93/010, Robert S. Kerr Environmental
Research Laboratory, Office of Research & Development, USEPA,
Ada Oklahoma, Feb 1993.


Ken Fantone P.G.
The RETEC Group, Inc.
2409 Research Blvd., Suite 106
Fort Collins, CO 80526
(970) 493-3700 ext 138

You can download a scanned version from
http://www.epa.gov/ada/csmos/models.html

ken_fantone wrote:

>I thought I would write to inform the folks interested in creating a
>groundwater modeling tutorial that the EPA created such a document.
>This is a manual of 20 problems of increasing difficulty. The
>groundwater exercises are all written for MODFLOW and included
>digital files for each of the problems. While this document was free
>at one time, I doubt it is any longer. The problems can be
>purchased, however, from Scientific Software for approximately $75
>US.
>
>The manual was written by Peter Anderson of Geotrans. The reference
>is below:
>
>U.S. EPA, 1993, A Manual of Instructional Problems for the U.S.G.S.
>MODFLOW Model, EPA/600/R-93/010, Robert S. Kerr Environmental
>Research Laboratory, Office of Research & Development, USEPA,
>Ada Oklahoma, Feb 1993.
>
>
>Ken Fantone P.G.
>The RETEC Group, Inc.
>2409 Research Blvd., Suite 106
>Fort Collins, CO 80526
>(970) 493-3700 ext 138

Agree, we have to set the web site, then we could post suggested material for
reading. Perhaps we could organize our output in levels, i.e. elementary,
beginner, … Each level have a roughly time frame, without rigid deadlines , to
ensure that each level will not take time more or less than it deserves.

Rehab

Rehab O. Abdel Rahman
Lecturer
Hot Laboratory Center
Atomic Energy Authority Of Egypt


DMBean <dmbean@...> wrote:

Kumar:

Thank you for the summary of suggestions for a Groundwater Modeling Guidance
document. Many of the ideas can be addressed with only minor effort, other
may be long-term goals.

Perhaps the first thing we need to do is set up a web site that where we can
share ideas, drafts of documents, and sample problems. The working group
members would have read/write access, and everyone would have read access.

Microsoft Sharpoint can be used to develop this type of website. I will see
if I can arrange for this on my company server. Alternatively, if someone is
so inclined, a more "classic" HTML web site can be developed and hosted by
someone else.

Once we have a site developed, I think we can post available guidance
relatively quickly, and develop new guidance over time. I would prefer to
keep things relatively informal, with flexible deadlines so this does not
become a burden to the working group.

Regards

David M. Bean

In addition to Ken's recommendation, another USEPA document that may
be of interest to this group is the "Ground Water Modeling Compendium"
which can be viewed at

http://nepis.epa.gov/Exe/ZyNET.exe/100000A2.txt?ZyActionD=ZyDocument&Client=EPA&\
Index=National%20Environmental%20Publications%20Info&Docs=&Query=&Time=&EndTime=\
&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=pubnumber%5E500B94004%20%20%\
20%20%20%20&QFieldYear=&QFieldMonth=&QFieldDay=&UseQField=pubnumber&IntQFieldOp=\
1&ExtQFieldOp=1&XmlQuery=&File=D%3A%5CZYFILES%5CINDEX%20DATA%5CNEPIS%5CTXT%5C000\
0000H%5C100000A2.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumD\
ocuments=10&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=p%7C\
f&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&Maxi\
mumPages=1&ZyEntry=1&SeekPage=x%3Cp%3E

I have links to other on-line documents related to groundwater
modeling at the AQTESOLV Users Group:

http://groups.yahoo.com/group/AQTESOLV/

Please contact me if you would like to contribute a link.

Regards,
Glenn

AQTESOLV v4.0 is now available!
AQTESOLV: http://www.aqtesolv.com/
Aquifer Test Forum: http://www.aquifertest.com/
AQTESOLV Users Group: http://groups.yahoo.com/group/AQTESOLV/

--- In gwmodel@yahoogroups.com, "ken_fantone" <kfantone@...> wrote:
>
> I thought I would write to inform the folks interested in creating a
> groundwater modeling tutorial that the EPA created such a document.
> This is a manual of 20 problems of increasing difficulty. The
> groundwater exercises are all written for MODFLOW and included
> digital files for each of the problems. While this document was free
> at one time, I doubt it is any longer. The problems can be
> purchased, however, from Scientific Software for approximately $75
> US.
>
> The manual was written by Peter Anderson of Geotrans. The reference
> is below:
>
> U.S. EPA, 1993, A Manual of Instructional Problems for the U.S.G.S.
> MODFLOW Model, EPA/600/R-93/010, Robert S. Kerr Environmental
> Research Laboratory, Office of Research & Development, USEPA,
> Ada Oklahoma, Feb 1993.
>
>
> Ken Fantone P.G.
> The RETEC Group, Inc.
> 2409 Research Blvd., Suite 106
> Fort Collins, CO 80526
> (970) 493-3700 ext 138
>

Hi Ken & Richard:

Thanks for the suggestion.  I also have a PDF version of the MODFLOW problem
set along with the associated MODFLOW data sets.  We hope to post these and
other public domain tutorials on a web site available to everyone.

David M. Bean

-----Original Message-----
From: gwmodel@yahoogroups.com [mailto:gwmodel@yahoogroups.com] On Behalf Of
ken_fantone
Sent: Monday, August 07, 2006 11:00 AM
To: gwmodel@yahoogroups.com
Subject: [gwmodel] Re: Working Group for Groundwater Modelling Guidance

I thought I would write to inform the folks interested in creating a
groundwater modeling tutorial that the EPA created such a document.
This is a manual of 20 problems of increasing difficulty. The
groundwater exercises are all written for MODFLOW and included
digital files for each of the problems. While this document was free
at one time, I doubt it is any longer. The problems can be
purchased, however, from Scientific Software for approximately $75
US.

The manual was written by Peter Anderson of Geotrans. The reference
is below:

U.S. EPA, 1993, A Manual of Instructional Problems for the U.S.G.S.
MODFLOW Model, EPA/600/R-93/010, Robert S. Kerr Environmental
Research Laboratory, Office of Research & Development, USEPA,
Ada Oklahoma, Feb 1993.


Ken Fantone P.G.
The RETEC Group, Inc.
2409 Research Blvd., Suite 106
Fort Collins, CO 80526
(970) 493-3700 ext 138

Hi David M. Bean

   Is this possible for you to e mail your PDF version of the MODFLOW problem as
an attach to the group.

   Farshid Farhani

(Note: attachments are nor allowed in this group - Moderator)


DMBean dmbean@... wrote:
           Hi Ken & Richard:

Thanks for the suggestion. I also have a PDF version of the MODFLOW problem
set along with the associated MODFLOW data sets. We hope to post these and
other public domain tutorials on a web site available to everyone.

David M. Bean

-----Original Message-----
From: gwmodel@yahoogroups.com [mailto:gwmodel@yahoogroups.com] On Behalf Of
ken_fantone
Sent: Monday, August 07, 2006 11:00 AM
To: gwmodel@yahoogroups.com
Subject: [gwmodel] Re: Working Group for Groundwater Modelling Guidance

I thought I would write to inform the folks interested in creating a
groundwater modeling tutorial that the EPA created such a document.
This is a manual of 20 problems of increasing difficulty. The
groundwater exercises are all written for MODFLOW and included
digital files for each of the problems. While this document was free
at one time, I doubt it is any longer. The problems can be
purchased, however, from Scientific Software for approximately $75
US.

The manual was written by Peter Anderson of Geotrans. The reference
is below:

U.S. EPA, 1993, A Manual of Instructional Problems for the U.S.G.S.
MODFLOW Model, EPA/600/R-93/010, Robert S. Kerr Environmental
Research Laboratory, Office of Research & Development, USEPA,
Ada Oklahoma, Feb 1993.

Ken Fantone P.G.
The RETEC Group, Inc.
2409 Research Blvd., Suite 106
Fort Collins, CO 80526
(970) 493-3700 ext 138

Dear Friends,
Water wells in my area have found some problem with their screens.
  They closed because of sediment gathering on their holes. So the
water's discharge is redused or in some wells there are no more water
in well.
Is there any solution for this problem? and How can we remove the
sediments from screen?

Best Regards
Amin Darbandi

The well design should be based on the precise description of the cuttings
and the geophysical logs. Selection of the proper screen material and slot
size will therefore be based on the grain size distribution. It may may be
necessary to design a well using gravel pack which again depends on the
analysis of the grain size distribution curves. Please refer to the Johnson
book on Groundwater and wells.

Best regards
Omar Salem
GWA
Tripoli-Libya

-------Original Message-------

From: Amin
Date: 08/13/06 06:44:38
To: gwmodel@yahoogroups.com
Subject: [gwmodel] Wells screen

Dear Friends,
Water wells in my area have found some problem with their screens.
They closed because of sediment gathering on their holes. So the
water's discharge is redused or in some wells there are no more water
in well.
Is there any solution for this problem? and How can we remove the
sediments from screen?

Best Regards
Amin Darbandi

Dear Amin,

Normally, gravel packings are given at the time of well construction inorder
to prevent clogging of screens. Well cleanup (purging) using compressed
air can be tried to remove the silts.

Hope this helps.

regards

Noble

Noble Jacob
Isotope Hydrologist
Isotope Hydrology Section
Bhabha Atomic Research Centre
Trombay, Mumbai-400 085
INDIA

On Sat, 12 Aug 2006, Amin wrote:

> Dear Friends,
> Water wells in my area have found some problem with their screens.
>  They closed because of sediment gathering on their holes. So the
> water's discharge is redused or in some wells there are no more water
> in well.
> Is there any solution for this problem? and How can we remove the
> sediments from screen?
>
> Best Regards
> Amin Darbandi

Dear Amin

i think scaling effect of the groundwater also some times ends up in such
condition, if so get it verified.

i dont know whether the slushing the wells as we do in slug test method can be
helpfull, if you try for such an attempt please let me know about it.

bye
vijay


Amin <darbandiamin@...> wrote:
   Dear Friends,
Water wells in my area have found some problem with their screens.
They closed because of sediment gathering on their holes. So the
water's discharge is redused or in some wells there are no more water
in well.
Is there any solution for this problem? and How can we remove the
sediments from screen?

Best Regards
Amin Darbandi

Amin:

The usual practice is to construct a filter pack around the well
and then purge it to eliminate the screen pluging problem beforehand, but you
might try hydraulic surging with a packer because without the packer, the
backflow which washes the screen clear will be diffuse with length.  I'd try
using the packer at 2' intervals for backflushing the wells

Dave Russell


At 08:00 AM 8/14/2006  Monday, you wrote:
>Dear Amin
>
>i think scaling effect of the groundwater also some times ends up in such
>condition, if so get it verified.
>
>i dont know whether the slushing the wells as we do in slug test method
>can be helpfull, if you try for such an attempt please let me know about it.
>
>bye
>vijay
>
>
>Amin <darbandiamin@...> wrote:
>   Dear Friends,
>Water wells in my area have found some problem with their screens.
>They closed because of sediment gathering on their holes. So the
>water's discharge is redused or in some wells there are no more water
>in well.
>Is there any solution for this problem? and How can we remove the
>sediments from screen?
>
>Best Regards
>Amin Darbandi

Hello Amir,

The wells need to be re-developed to remove the sediment.  I would recommend
surge blow method to remove sediment from the filter pack, but I've included
some other methods.

Cheers,
Aaron

APPENDIX 4: WELL DEVELOPMENT METHODS*

1. Pumping or Bailing Method

1.1 Continuous Overpumping

The continuous overpumping method of well development is accomplished by
uninterrupted pumping at pumping rates up to 11/2 times the design capacity
of the well.

1.2 Interrupted Overpumping

The interrupted overpumping method of well development is done with a pump
capable of pumping at rates up to 2 times the design capacity. The pumping
should be carried out in at least 5 steps. These steps should include
pumping rates of 1/4, 1/2, 1, 11/2, and 2 times the well design capacity,
with no check valve nor foot valve present. Pumping should be conducted in 5
minute cycles, and should continue a minimum of 2 hours or until such time
as acceptable standards are attained.

1.3 Surging and Bailing (Utilizing Bailer)

The surging and bailing method of well development is accomplished by
utilizing the bailer as a surging device. If fines have been drawn into the
well and have settled on the bottom and accumulated to a depth where they
block 10 percent or more of the total screen length, the well must be bailed
or otherwise cleaned to the bottom before resumption of surging. On
completion of development the well should be cleaned to the bottom.

1.4 Surging and Bailing (Utilizing Surge Block)

This development process is carried out by surging and bailing the well.
Surging is done with a single or double solid (or valved) surge block.
Surging starts at the bottom of the lowest screen in the well and proceeds
upwards.

2. Mechanical Surging and Pumping Method

2.1 Surging and Pumping

In this development process surging is done by either a solid or valve surge
block. The pumping is done through the surge block which incorporates a
piece of the suction pipe in the fabrication of the block. Pumping is done
simultaneously with the surging at rates up to 1/2 of the design capacity.
Fines drawn into the well are pumped out periodically before such
accumulation reaches 10 percent of the screen length. Upon completion of the
development work the well should be cleaned to the bottom.

3. Hydraulic Jetting Method

3.1 Hydraulic Jetting

In the hydraulic jetting method well development is accomplished by
simultaneous high-velocity, horizontal jetting and pumping. The outside
diameter of the jetting tool should be one inch less in diameter than the
screen inside diameter. The minimum exit velocity of the jetting fluid at
the jet nozzle should be 150 ft./sec. The tool is rotated at a speed less
than one rpm. The jetting tool is positioned at one level for not less than
two minutes and then moved to the next level which should be no more than 6
inches vertically from the preceding jetting level. Jetting proceeds from
the bottom of the screen to the top. Pumping from the well should be at a
rate of 5 to 15 percent more than the rate at which water is introduced
through the jetting tool. Water to be used for jetting should contain less
than 1ppm suspended solids. A pump which can deliver a minimum 100 gpm at a
minimum 100 psi is generally required.

4. Air Development Method

4.1 Single Pipe System Open to Atmosphere

In this method, development is done by the utilization of a single pipe air
pumping system using the casing or the bore hole itself as the eductor line.
The compressors, air lines, hoses, fittings, etc., are of adequate size to
pump the well by the air lift principle at 11/2, to 2 times the design
capacity of the well. Initially the well is pumped with air until it is
developed to the point that the well yields clear, sand-free water. Air is
then shut off and water allowed to return into the well until a static
condition is reached. The valve is then reopened and air is introduced into
the well until water is again brought to the surface by the air lift at
which time the air valve is closed and the water allowed to drop back down
the well and return to a static condition. This process of lifting and
dropping of the column of water is repeated until the water in the well
becomes turbid at which time the well is then continuously pumped with air
until it again yields clear sand-free water. The above operation is repeated
until the well no longer produces fine material when it is surged and
backwashed as described above.

The bottom of the air line is placed at different levels in order to
facilitate development of all intake areas and multiple water producing
zones, and the process is repeated until all zones yield water free of
turbidity when surged and backwashed.

4.2 Single Pipe System Closed to Atmosphere

For this method, a suitable valve is installed on the discharge line leading
from the top of the casing, and an air fine is secured into a blowing "tee"
or "ell" affixed to a valved air connection on the top of the casing. The
valve is then closed on the discharge line, and an air hose is attached to
the valved fitting and air is introduced into the well, forcing the column
of water in the well down. Care must be exercised to prevent air from
entering the water-bearing formation. This can be accomplished by the
installation of a separate pipe, open to the atmosphere at the top, and
installed in the well to a point ten feet above the water-bearing zone. When
the water level in the well is forced down to the bottom of this air release
pipe, the discharge valve is opened and the water is allowed to rise back to
the static level. This procedure can be repeated and/or alternated with the
"Single Pipe System Open to the Atmosphere" technique. A pressure gauge and
relief valve can be installed at the top of the casing when this system is
used.

4.3 Two Pipe System

The development process is carried out by the utilization of an air
"introducing" pipe and an air and water eductor line. The compressors, air
lines, hoses, fittings, etc., should be of adequate size to pump the well by
the air lift method at 11/2, to 2 times the design capacity of the well. The
well is initially developed as outlined in the above "Single Pipe System
Closed to the Atmosphere," with the air line introducing air into the
eductor line at a point above the bottom of the eductor line. When the well
yields clear sand-free water, the air line can be lowered to a point below
the bottom of the eductor line and air introduced until the water between
the eductor pipe and the casing is raised to the surface. At this time the
air line should be raised back up into the eductor fine causing the water to
be pumped from the well through the eductor line. The procedure of
alternating the relative positions of the air and eductor line is repeated
until the water yielded by the well remains clear when the well is surged
and backwashed by this technique.

*From EPA-570/9-75001


>From: "Amin" <darbandiamin@...>
>Reply-To: gwmodel@yahoogroups.com
>To: gwmodel@yahoogroups.com
>Subject: [gwmodel] Wells screen
>Date: Sat, 12 Aug 2006 07:14:13 -0000
>
>Dear Friends,
>Water wells in my area have found some problem with their screens.
>  They closed because of sediment gathering on their holes. So the
>water's discharge is redused or in some wells there are no more water
>in well.
>Is there any solution for this problem? and How can we remove the
>sediments from screen?
>
>Best Regards
>Amin Darbandi

Date: Mon, 14 Aug 2006 15:45:28 -0700 (PDT)
From:  "Kumar Kuchanur" <kpmkumar@...>
Subject: Looking for a job as groundwater modeler/Hydrogeologist
To: cpkumar@...

Dear Sir,

I recently graduated with my PhD in Environmental Engineering and I
am looking for a suitable position in groundwater modeling /
Hydrogeology. If you could please post the below mail about my
profile in the forum, it will immensely help my job search to find a
suitable position.

Thanks in advance,
Sincerely,

Muthu
Research Assistant,
Department of Environmental Engineering
Texas A&M University-Kingsville
Kingsville
Phone: 1 832 660 4424
Email: muthukuchanur@...
Texas, USA
---------------------------------------------------------------------
I have a strong understanding about groundwater modeling and have
developed a variety of flow models for projects funded by state and
local agencies in Texas as part of my doctoral dissertation. I have
extensively used MODFLOW and I have strong knowledge of using GMS,
PMWIN and GW Vistas. Some of the highlights of my resume are

* Registered Engineer in Training (E.I.T)
* P.I in a project funded by USGS (April 2005- April 2006)
* A total of 9 publications including 5 peer reviewed journal
publications
* Authored and submitted 3 technical reports to project sponsors
* 17 presentations including 4 awards at various state, national and
international conferences
* Sound understanding of groundwater modeling and expertise in using
MODFLOW (Proficient in using GMS, PMWIN and GW Vistas)

* Experience working with MODPATH, MT3D, AutoCAD 2004 and STATISTICA
* Extensive knowledge in ESRI ARCGIS 9.1 and relational database
environments
* Excelled in working with MS Word, MS Excel, MS PowerPoint, and MS
Access
*   Involved in conducting various field scale groundwater
investigations including aquifer pump tests, collection/analysis of
groundwater samples
* Goal oriented, quick learner with a willingness and attitude to
perform within an entrepreneurial environment

I will be glad to send a detailed resume and I can be reached at
muthukuchanur@... or at 1-832 660-4424

Thanks,
Sincerely,
Muthu Kuchanur
832 660 4424 (mobile)

Does anyone is working with SEAWAT? I want to know how can I deal with coastal
aquifers using SEAWAT.

Thanks a lot
Dalva

Dear Amin,

    Isn't it unusual that all wells in an area are gathering sediment. I think
you should check the local companies or authorities methodology for screening.
For new wells they have to make some calculation  in order to determine screen
size by using sieve analyses results.
   For existing wells unfortunately, you should warn the users to reduce rate
before aquifer make it for themselves.

   Best Regards

   Goktug EVIN


Amin <darbandiamin@...> wrote:
           Dear Friends,
Water wells in my area have found some problem with their screens.
They closed because of sediment gathering on their holes. So the
water's discharge is redused or in some wells there are no more water
in well.
Is there any solution for this problem? and How can we remove the
sediments from screen?

Best Regards
Amin Darbandi

Amin:

There a several ways to clear clogged screen and generally clean up a well.
Assuming you have a workover rig to allow the use of downhole tools you can
use a surge block and pumping or pressure washer to clean the screen.  If
scale is your problem you could acidize the well to dissolve the buildup
followed by redevelopment of the well.  It is always preferable to construct
a well with a properly designed gravelpack, but if your well is not
gravelpacked utilizing a surge block and pumping can affect a natural
gradation of the formation around the well bore that can act as a "natural"
gravelpack.  Hope this helps

John Reay, P.G.

-----Original Message-----
From: gwmodel@yahoogroups.com [mailto:gwmodel@yahoogroups.com] On Behalf Of
Amin
Sent: Saturday, August 12, 2006 12:14 AM
To: gwmodel@yahoogroups.com
Subject: [gwmodel] Wells screen

Dear Friends,
Water wells in my area have found some problem with their screens.
  They closed because of sediment gathering on their holes. So the
water's discharge is redused or in some wells there are no more water
in well.
Is there any solution for this problem? and How can we remove the
sediments from screen?

Best Regards
Amin Darbandi

this manual is a good start

http://fl.water.usgs.gov/PDF_files/twri_6_A7_guo_langevin.pdf

cheers

--- DALVITA MARANGANI <avladmapla@...> wrote:

> Does anyone is working with SEAWAT? I want to know
> how can I deal with coastal aquifers using SEAWAT.
>
> Thanks a lot
> Dalva

Hi, Dalva:

I am one of the authors of SEAWAT.  Please let me know what I can do to help
you.

Here is my contact:
Weixing Guo
wguo1@...
239-481-6494

Regards,

Weixing


DALVITA MARANGANI <avladmapla@...> wrote:

>Does anyone is working with SEAWAT? I want to know how can I deal with coastal
aquifers using SEAWAT.
>
>Thanks a lot
>Dalva

The reason is most likely to be encrustation by iron (and manganese)
hydro-oxydes (hydrated Fe hydroxides). This develops when wells are
constructed are in an aquifer with elevated iron concentrations and
conditions close to anoxia. There is no low cost solution, although acid
treatment can help temporarily but it does not resolve the underlying
problem.

There are in situ treatment techniques available, such as cyclic
injection of oxygenated water, but they require careful design and
operation.

It would help if you had an analysis of water from the well that is
affected.

Milo



goktug evin wrote:

> Dear Amin,
>
> Isn't it unusual that all wells in an area are gathering sediment. I
> think you should check the local companies or authorities methodology
> for screening. For new wells they have to make some calculation in
> order to determine screen size by using sieve analyses results.
> For existing wells unfortunately, you should warn the users to reduce
> rate before aquifer make it for themselves.
>
> Best Regards
>
> Goktug EVIN
>
>
> Amin <darbandiamin@... <mailto:darbandiamin%40yahoo.com>> wrote:
> Dear Friends,
> Water wells in my area have found some problem with their screens.
> They closed because of sediment gathering on their holes. So the
> water's discharge is redused or in some wells there are no more water
> in well.
> Is there any solution for this problem? and How can we remove the
> sediments from screen?
>
> Best Regards
> Amin Darbandi