Appendix R

Typical  Resistivities  of  Soils  and  Rocks 

 

 

 

Material                                              Ohm-Meters    Ohm-Cent.               Ohm-Feet

 

Wet to moist clayey soils                    2 to 3                 200 to 300                 5  to  10

 

Wet to moist silty clay & silt soils       3 to 15              300 to 1,500              10  to  50

 

Well-fractured to slightly fractured     

  bedrock with moist cracks                15 to 150           1,500 to 15,000         50  to  500

 

Sand and gravel with silt                     150 to 800         15,000 to 80,000       500  to  3,000

 

Slightly fractured bedrock with

  dry soil filled cracks                          300 to 2,500      30,000 to 250,000     1,000 to 8,000

 

Sand and gravel with layers

  of silt                                                  300 to 2,500      30,000 to 250,000    1,000 to 8,000

 

Massive bedrock                                 2,500 plus         250,000 plus             8,000 plus

 

Coarse dry sand and gravel               2,500 plus         250,000 plus             8,000 plus


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