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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