Ground water resistivity

[Paykon]

If we want to measure ground water resitivity for desiging a ground system for a station what is the procesure?

We conducting a ground water resistivity test on the site or take a sample for measuring the resistivity?

 

[dpc]

Typically, you are interested in the resistivity of the soil/water combination, not the water alone.

"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg

 

[Paykon]

How about to measure water resistivity as a return path for fault current in a hydroelectric dam that uses a penstock or a tunnel for carrying the water.

 

[7anoter4]

As far as I know only sea water is used for grounding purpose [Cathodic Protection of Metallic Structures as bridges -for instance].
From

http://www.smeter.net/grounds/soil-electrical-resistance.php

:
Freshwater lakes, unpolluted 1000 ohm.m
Sea water, away from river estuaries 0.22 ohm.m

 

[dpc]

The water will not be there all the time in the case of a penstock. Fresh water is actually not a great conductor. Pure water is not a conductor at all.

"The more the universe seems comprehensible, the more it also seems pointless." -- Steven Weinberg