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Ground water resistivity

Ground water resistivity

Ground water resistivity

(OP)
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?

RE: Ground water resistivity

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

RE: Ground water resistivity

(OP)
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.  

RE: Ground water resistivity

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  
 

RE: Ground water resistivity

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

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