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Soil Type

Probable value (Ohm.m)

Range (Ohm.m)

Alluvium and lighter clays

5

moisture dependant
Clays (Excluding alluvioum)

10

5-20
Marls (e.g. Keuper marl)

20

10-30
Porous limestone (e.g. chalk)

50

30-100
Porous sandstone

100

30-300
Quartzites, compact and crystalline limestone (e.g. carboniferous sediments, marble, etc.)

300

100-1000
Clay slates and slatey chales

1000

300-3000
Granite

1000

750-1250
Fissile slates, schists, gneiss and igneous rock

2000

1000+

 

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