Dear Prof. Rao,
I am interested in your work. I am siezing this
opportunity to register my support for the suggestion
by Pradeep Raj. Please, let me have a copy when the
publication is ready.
Best regards.
Bolaji. G. A. (Nigeria)

--- Pradeep Raj <pradeepraj7532025@...> wrote:

> Dear Prof R.J. Rao
> Good to know that you have developed geophysical
> methods which have wide applications - I would like
> to know whether you have published them, if you
> have, kindly give me details. Otherwise publish them
> and take a patent preferably US
> Regards
> Pradeep Raj
>
> "Prof. R. Jagadiswara Rao" <jagadiswara@...>
> wrote:
> This message is in reply to Y. Srinivasa Rao's
> message at
> http://in.groups.yahoo.com/group/gwrm/message/21 on
> "Groundwater
> study - Electrical resistivity methods - Theoretical
> master curves -
> Curve matching software".
>
> The subsurface structure at any given point at the
> surface (by way
> of finding true resistivity and thickness of
> horizontal geological
> layers) could be determined fairly accurately by
> matching field
> curves of electrode spacing and apparent resistivity
> obtained by
> Wenner/Schlumberger method with any of the available
> albums of
> master curves.
>
> Curve matching used to be performed in the past by
> matching the
> field curve drawn on a transparent logarithmic graph
> paper with one
> or other of a master curve chosen from an album.
> Very often the
> exact match between the field curve and the
> appropriate master curve
> could be obtained only by appropriate manipulation
> of field curve. I
> could however have access to an album of master
> curves when I
> attended a UNESCO-sponsored course, seminar and tour
> in the Moscow
> State University during 1978. I shall be happy to
> share the album
> with Srinivasa Rao or any other participant of this
> group finding
> use with it.
>
> Most commercial firms have now access to
> sophisticated curve
> matching software programmes which allow for
> accurate interpretation
> of resistivity data and thereby avoid subjective
> errors. In view of
> their high commercial value, these software
> programmes are not made
> available in the Internet on free basis.
>
> I have been using electrical resistivity methods in
> conjunction with
> other exploration methods since 1968 as a part of a
> training
> programme to students and less-educated youth for
> locating
> particularly pipeline-like fractures carrying
> artesian/ confined
> groundwater within hard rocks of south India. As
> curve matching
> methods are cumbersome, costly, time-consuming and
> prone for
> subjective errors, I found it extremely convenient
> to make use of an
> adaptation of an inverse slope method to obtain
> thickness and true
> resistivity of horizontal geological formations just
> by using a
> pocket calculator and thereby avoid preparation of
> any field curve
> and curve matching. The methodology has been so
> simplified that it
> could be taught even to less-educated people to
> become successful
> barefoot geologists/geophysicists. Many water
> diviners who make use
> of gadgets such as twig, coconut and pendulum in
> locating
> groundwater found it advantageous to practice these
> scientific
> methods also to achieve a higher success rate. The
> cost of
> exploration could be made sufficiently low by the
> prospector
> visiting the field with the equipment almost alone
> by training the
> local people to assist him in the survey.
>
> This understanding of the subsurface structure is
> useful not only in
> the exploration of minerals, oil & natural gas and
> groundwater but
> also in geotechnical engineering, watershed
> management and
> artificial groundwater recharge. This knowledge is
> particularly
> helpful to those engaged in watershed management
> works to identify
> sites best suited for artificial recharge of
> groundwater through
> maximising infiltration from those best suited for
> rainwater
> harvesting for domestic use/ drinking/ irrigation by
> maximising
> surface runoff. It is worthwhile for NGOs engaged in
> such works to
> procure the necessary equipment besides training
> their staff to take
> up such surveys.
>
> I shall be happy to impart training to NGOs/
> individuals who can
> come and stay at Tirupati for some time in
> electrical resistivity
> and other scientific exploration methods, which I
> have developed
> during the past 37 years.
>
> You can contact me at:
> Dr. R. Jagadiswara Rao
> Former Professor of Geology, Sri Venkateswara
> University &
> Chairman, Rayalaseema Vikas Parishad (RVP)
> 63A, 2nd Cross West, Vidyanagar
> Tirupati, AP 517502, India
> Telephone: +91-877-2249433
> Mobile: +91-94401-84012
> Email: jagadiswara@..., rvp_org80@...
>
>
>
>
>
>
>
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>
>
> Dr.Pradeep Raj, M.Sc., Ph.D
> # 1-2-606//80/37, LIC Colony, Opposite: Indira Park,
> Lower Tank bund Road Hyderabad – 500 080 India
> Phone +91 040 2767 1888
> pradeepraj7532025@...
> gpradeepraj@...
> gpradeepraj2001@...
>
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