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 MIL-HDBK-419A
Table 2-3
Resistivity Values of Earthing Medium (2-5), (2-6), (2-7)
Medium
Minimum
Average
Maximum
(ohm-cm)
(ohm-cm)
(ohm-cm)
Surface soils, loam, etc.
Clay
Sand and gravel
Surface limestone
Granites, basalts, etc.
Decomposed gneisses
Slates, etc.
Fresh Water Lakes
Tap Water
Sea Water
Pastoral, low hills, rich soil, typical
of Dallas, Texas; Lincoln, Nebraska
areas
Flat country, marshy, densely wooded
typical of Louisiana near Mississippi
River
Pastoral, medium hills and forestation,
typical of Maryland, Pennsylvania, New
York, exclusive of mountainous territory
and seacoasts
Rocky soil, steep hills, typical of New
England
Sandy, dry, flat, typical of coastal
country
City, industrial areas
2-10
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