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

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

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Building Construction
Rotary drilling

Is not suitable for deposits containing very coarse gravel
Hinders the ground water observations and permeability test
Is not economical for holes of less than 10 cm
All listed here

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