Building Construction
Engineering news formula for obtaining safe bearing capacity of pile for drop hammer, is,

Q = Wh/6 (S + 2.5)
Q = (W × 6)/h (S + 2.5)
Q = (W × 2.5)/6 (S + h)
Q = Wh/2.5 (S + 6)

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Building Construction
Auger boring

All of these
Is generally employed in cohesive and other self soils above water table
Is most economical up-to a depth of 5 meters
Is the most primitive method for making a hole in the ground

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