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Question
I am doing my mphil research in hydrogeology.i have well and resistivity data of Nowshera area,KPK,Pakistan.
Can you tell me how i can calulate the dar-zarrouk parameters.
Also how i can make contours of these parameters.
What is the equation of anisotropic parameter(ʎ).
How i can calculate this (ʎ).
what is the purpose of anisotropic parameter calculation.
If you send me any paper related to these.I will be very grateful to you.

Answer
Dear  Asia
Thanks for your question, Sorry for the delay as i was in field work and unable to get access to my PC.
Calculation of Dar Zarrouk parameters:
For a sequence of n horizontal, homogeneous and isotropic
layers of resistivity ρi and thickness hi , the DZ parameters (longitudinal conductance S and transverse resistance T) are defined respectively:


Si = n∑i=1       hi/ρi(siemens)
Ti = n∑i=1       ρi ・ hi (ohm.m2)

Now with the available resistivity data(pho a and ab/2) you have I hope you can calculate pho and h respectively.
From that data you can find out Dar Zaruk parameters.
Regrding contours you can mark the value of the DZ parameter  for a particular depth and draw contour by manually or using any software.
You can refer from google search the available paper on RESISTIVITY (DC) METHOD APPLIED TO AQUIFER PROTECTION STUDIES by  Antonio Celso de Oliveira Braga, Walter Malagutti Filho and Jo˜ao C. Dourado and also http://seisweb.usask.ca/classes/GEOL335/2004/Lectures/PDF/Resistivity.pdf

Anisotropic parameter : (ʎ)
Commonly the calculated values differ from actual ones due to anisotropy.
You can refer : THE FUNDAMENTAL EQUATIONS OF ELECTRICAL PROSPECTING RAYMOND MAILLET In
A Journal of’ General and Applied Geophysics- VOLUME XII OCTOBER, 1947-Number-4
For general Reference you can look onto
Geoelectrical data analysis to demarcate ground water pockets and recharge zones in champhavathi river basin, vizianagaram district, Andhra Pradesh, India,J. Indian Geophysics Union 2003.Vol.7. N0.2 pp-105-113. All the  reference you can download from google.
Thanks,
Kothandapani Manoharan  

Geology

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Manoharan Kothandapani alias Manoharan

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